add the epm component, epm is a service that is used to manage the cache pools...

add the epm component, epm is a service that is used to manage the cache pools to optimize the startup time of encalve.

epm/.circleci/config.yml

+# Golang CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-go/ for more details
+version: 2
+jobs:
+  build:
+    docker:
+    - image: circleci/golang:1.13
+    working_directory: /go/src/github.com/alibaba/inclavare-containers/epm
+    steps:
+    - checkout
+    - setup_remote_docker
+    - run:
+        name: run tests
+        command: |
+          test -z $(go fmt ./...)
+          go vet -asmdecl=false ./...
+          go test -race -v ./...
+    - run: 
+        name: build binary
+        command: |
+          make binary
+    - run:
+        name: golangci-lint
+        command: |
+          curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.22.2
+          golangci-lint run --disable govet
+  markdown-lint:
+    docker: # run the steps with Docker
+    - image: circleci/node:12
+    working_directory: ~/epm
+    steps:
+    - checkout
+    - setup_remote_docker
+    - run:
+        name: markdownlint
+        command: |
+          sudo npm install -g markdownlint-cli
+          markdownlint -i vendor -f **/*.md
+    - run:
+        name: use markdown-link-check(https://github.com/tcort/markdown-link-check) to check links in markdown files
+        command: |
+          sudo npm install -g markdown-link-check
+          set +e
+          for name in $(find . -name \*.md | grep -v vendor); do 
+            if [ -f $name ]; then 
+              markdown-link-check -q $name; 
+              if [ $? -ne 0 ]; then
+                code=1
+              fi
+            fi 
+          done 
+          bash -c "exit $code";
+    - run:
+        name: markdown-spellcheck
+        command: |
+          sudo npm install -g markdown-spellcheck
+          find . -name \*.md | grep -v '^./vendor' | xargs mdspell --ignore-numbers --ignore-acronyms --en-us -r -x
+workflows:
+  version: 2
+  ci:
+    jobs:
+      - build
+      - markdown-lint

epm/.gitignore

+build/
+.idea/
+_output/
\ No newline at end of file

epm/.markdownlint.json

+{
+  "default": true,
+  "MD013": { "line_length": 512 }
+}

epm/.spelling

+# markdown-spellcheck spelling configuration file
+# Format - lines beginning # are comments
+# global dictionary is at the start, file overrides afterwards
+# one word per line, to define a file override use ' - filename'
+# where filename is relative to this configuration file
+sgx-device-plugin
+Kubernetes
+Alibaba
+ACK-TEE
+sgx-enabled
+containerd
+kube-scheduler
+CONTRIBUTING.md
+DaemonSet
+LibOS
+K8s
+aesmd
+aesm.socket
+enable-aesm-socket-attach
+sgx-device-plugin-enable-aesm-socket-attach
+e.g.
+yml
+yaml
+shim
+shim-rune
+rune
+occlum
+graphene
+runelet
+inclavare

epm/LICENSE

+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
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+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
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+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
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+      subsequently incorporated within the Work.
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+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
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+   6. Trademarks. This License does not grant permission to use the trade
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+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
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+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

epm/Makefile

+# Root directory of the project (absolute path).
+ROOTDIR=$(dir $(abspath $(lastword $(MAKEFILE_LIST))))
+
+# Base path used to install.
+DESTDIR ?= /usr/local
+
+ifneq "$(strip $(shell command -v go 2>/dev/null))" ""
+	GOOS ?= $(shell go env GOOS)
+	GOARCH ?= $(shell go env GOARCH)
+else
+	ifeq ($(GOOS),)
+		# approximate GOOS for the platform if we don't have Go and GOOS isn't
+		# set. We leave GOARCH unset, so that may need to be fixed.
+		ifeq ($(OS),Windows_NT)
+			GOOS = windows
+		else
+			UNAME_S := $(shell uname -s)
+			ifeq ($(UNAME_S),Linux)
+				GOOS = linux
+			endif
+			ifeq ($(UNAME_S),Darwin)
+				GOOS = darwin
+			endif
+			ifeq ($(UNAME_S),FreeBSD)
+				GOOS = freebsd
+			endif
+		endif
+	else
+		GOOS ?= $$GOOS
+		GOARCH ?= $$GOARCH
+	endif
+endif
+
+# Project binaries.
+COMMANDS=epm
+
+GO_BUILD_FLAGS=
+EPM_CGO_ENABLED ?= 0
+
+BINARIES=$(addprefix bin/,$(COMMANDS))
+
+.PHONY: clean all binaries help install uninstall package
+.DEFAULT: default
+
+all: binaries
+
+# Build a binary from a cmd.
+bin/epm:
+	@echo "bin/epm"
+	@CGO_ENABLED=${EPM_CGO_ENABLED} GOOS=${GOOS} go build ${GO_BUILD_FLAGS} -o bin/epm ./cmd/epm/main.go
+
+binaries: clean $(BINARIES) ## build binaries
+
+clean: ## clean up binaries
+	@echo "$@"
+	@rm -f $(BINARIES)
+
+package:
+	$(MAKE) -C dist package
+
+install: ## install binaries
+	@echo "$@ $(BINARIES)"
+	@mkdir -p $(DESTDIR)/bin
+	@install $(BINARIES) $(DESTDIR)/bin
+
+uninstall:
+	@echo "$@"
+	@rm -f $(addprefix $(DESTDIR)/bin/,$(notdir $(BINARIES)))
+
+help: ## this help
+	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST) | sort

epm/README-zh_CN.md

+# epm
+
+epm is a service that is used to manage the cache pools to optimize the startup time of encalve.
+
+
+## Build requirements
+
+Go 1.13.x or above.
+
+## How to build and install
+
+### Step 1: Build and install epm binary.
+```bash
+mkdir -p $GOPATH/src/github.com/alibaba
+cd $GOPATH/src/github.com/alibaba 
+git clone https://github.com/alibaba/inclavare-containers.git
+
+cd epm
+GOOS=linux make binaries
+make install
+ls -l /usr/local/bin/epm
+```
+
+### Step 2: Configuration
+
+The Configuration file of epm MUST BE placed into `/etc/epm/config.toml`
+
+```toml
+root = "/var/local/epm"
+
+[grpc]
+  address = "/var/run/containerd/containerd.sock"
+  uid = 0
+  gid = 0
+  max_recv_message_size = 16777216
+  max_send_message_size = 16777216
+
+[cache_pools]
+  [cache_pools.bundle-cache-pool_occlum_cache0]
+    type = "bundle-cache-pool.occlum.cache0"
+  [cache_pools.bundle-cache-pool_occlum_cache1]
+    type = "bundle-cache-pool.occlum.cache1"
+  [cache_pools.bundle-cache-pool_occlum_cache2]
+    type = "bundle-cache-pool.occlum.cache2"
+```
+
+## Run the epm
+```bash
+/bin/bash /usr/local/bin/epm
+```

epm/README.md

+# epm
+
+epm is a service that is used to manage the cache pools to optimize the startup time of encalve.
+
+
+## Build requirements
+
+Go 1.13.x or above.
+
+## How to build and install
+
+### Step 1: Build and install epm binary.
+```bash
+mkdir -p $GOPATH/src/github.com/alibaba
+cd $GOPATH/src/github.com/alibaba 
+git clone https://github.com/alibaba/inclavare-containers.git
+
+cd epm
+GOOS=linux make binaries
+make install
+ls -l /usr/local/bin/epm
+```
+
+### Step 2: Configuration
+
+The Configuration file of epm MUST BE placed into `/etc/epm/config.toml`
+
+```toml
+root = "/var/local/epm"
+
+[grpc]
+  address = "/var/run/containerd/containerd.sock"
+  uid = 0
+  gid = 0
+  max_recv_message_size = 16777216
+  max_send_message_size = 16777216
+
+[cache_pools]
+  [cache_pools.bundle-cache-pool_occlum_cache0]
+    type = "bundle-cache-pool.occlum.cache0"
+  [cache_pools.bundle-cache-pool_occlum_cache1]
+    type = "bundle-cache-pool.occlum.cache1"
+  [cache_pools.bundle-cache-pool_occlum_cache2]
+    type = "bundle-cache-pool.occlum.cache2"
+```
+
+## Run the epm
+```bash
+/bin/bash /usr/local/bin/epm
+```

epm/cmd/epm/app/options/options.go

+package options
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/BurntSushi/toml"
+	"github.com/alibaba/inclavare-containers/epm/config"
+	"github.com/spf13/pflag"
+)
+
+// Options containers the options of epm
+type Options struct {
+	// ConfigFile represents the absolute path of the epm configuration file
+	ConfigFile string
+}
+
+func (opts *Options) AddFlags(fs *pflag.FlagSet) {
+	if opts == nil {
+		return
+	}
+
+	fs.StringVar(&opts.ConfigFile, "config", "/var/epm/config.toml", "Path to the epm config file to be used.")
+}
+
+// ApplyTo loads the epm configuration file to the config.Config Object
+func (opts *Options) ApplyTo(cfg *config.Config) error {
+	if opts == nil {
+		return errors.New("options is nil")
+	}
+	if _, err := toml.DecodeFile(opts.ConfigFile, cfg); err != nil {
+		return fmt.Errorf("decode configuration failed. error: %++v", err)
+	}
+	return nil
+}

epm/cmd/epm/app/server.go

+package app
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"time"
+
+	"github.com/alibaba/inclavare-containers/epm/cmd/epm/app/options"
+	"github.com/alibaba/inclavare-containers/epm/config"
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm"
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm-api/v1alpha1"
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm/bundle-cache-pool/occlum"
+	cache_metadata "github.com/alibaba/inclavare-containers/epm/pkg/metadata"
+	grpc_prometheus "github.com/grpc-ecosystem/go-grpc-prometheus"
+	"google.golang.org/grpc"
+)
+
+func runServer(opts *options.Options) error {
+	var err error
+	var cfg config.Config
+
+	if err = opts.ApplyTo(&cfg); err != nil {
+		return err
+	}
+
+	// setting the grpc options
+	serverOpts := []grpc.ServerOption{
+		grpc.UnaryInterceptor(grpc_prometheus.UnaryServerInterceptor),
+		grpc.StreamInterceptor(grpc_prometheus.StreamServerInterceptor),
+	}
+	if cfg.GRPC.MaxRecvMsgSize > 0 {
+		serverOpts = append(serverOpts, grpc.MaxRecvMsgSize(cfg.GRPC.MaxRecvMsgSize))
+	}
+	if cfg.GRPC.MaxSendMsgSize > 0 {
+		serverOpts = append(serverOpts, grpc.MaxSendMsgSize(cfg.GRPC.MaxSendMsgSize))
+	}
+	metadata, err := cache_metadata.NewMetadataServer(cfg.DBPath, time.Second*time.Duration(cfg.DBTimeout))
+	defer metadata.Close()
+
+	if err != nil {
+		return fmt.Errorf("create metadata server failed. %++v", err)
+	}
+
+	server := epm.CachePoolManagerServer{}
+
+	bundleCache0 := occlum.Cach0Manager{
+		DefaultCachePoolManager: epm.DefaultCachePoolManager{
+			Root:          cfg.Root,
+			CacheMetadata: metadata,
+		}}
+	bundleCache1 := occlum.Cach1Manager{
+		DefaultCachePoolManager: epm.DefaultCachePoolManager{
+			Root:          cfg.Root,
+			CacheMetadata: metadata,
+		}}
+	bundleCache2 := occlum.Cach2Manager{
+		DefaultCachePoolManager: epm.DefaultCachePoolManager{
+			Root:          cfg.Root,
+			CacheMetadata: metadata,
+		}}
+	// registry the bundle cache pool managers to the manager server
+	server.RegistryCachePoolManager(&bundleCache0)
+	server.RegistryCachePoolManager(&bundleCache1)
+	server.RegistryCachePoolManager(&bundleCache2)
+
+	// start the grpc server with the server options
+	s := grpc.NewServer(serverOpts...)
+	// registry and start the cache pool manager server
+	v1alpha1.RegisterCachePoolManagerServer(s, &server)
+	// listen and serve
+	lis, err := net.Listen("udp", cfg.GRPC.Address)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to start cache pool manager server: %v", err)
+	}
+	return nil
+}

epm/cmd/epm/app/start.go

+package app
+
+import (
+	"github.com/alibaba/inclavare-containers/epm/cmd/epm/app/options"
+	"github.com/spf13/cobra"
+)
+
+// NewCachePoolManagerServer creat and start the cache pool manager server
+func NewCachePoolManagerServer() *cobra.Command {
+	opts := &options.Options{}
+	cmd := &cobra.Command{
+		Short: "Launch signature server",
+		Long:  "Launch signature server",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runServer(opts)
+		},
+	}
+	flags := cmd.Flags()
+	opts.AddFlags(flags)
+	return cmd
+}

epm/cmd/epm/main.go

+package main
+
+import (
+	"flag"
+	"os"
+	"runtime"
+
+	"github.com/alibaba/inclavare-containers/epm/cmd/epm/app"
+	"github.com/golang/glog"
+)
+
+func main() {
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU())
+	}
+
+	cmd := app.NewCachePoolManagerServer()
+	cmd.Flags().AddGoFlagSet(flag.CommandLine)
+
+	if err := cmd.Execute(); err != nil {
+		glog.Fatal(err)
+	}
+
+	flag.CommandLine.Parse([]string{})
+	if err := cmd.Execute(); err != nil {
+		glog.Fatal(err)
+	}
+}

epm/conf/config.toml

+root = "/var/local/epm"
+
+[grpc]
+  address = "/var/run/containerd/containerd.sock"
+  uid = 0
+  gid = 0
+  max_recv_message_size = 16777216
+  max_send_message_size = 16777216
+
+[caches]
+  [caches.bundle-cache-pool_occlum_cache0]
+    type = "bundle-cache-pool.occlum.cache0"
+  [caches.bundle-cache-pool_occlum_cache1]
+    type = "bundle-cache-pool.occlum.cache1"
+  [caches.bundle-cache-pool_occlum_cache2]
+    type = "bundle-cache-pool.occlum.cache2"
\ No newline at end of file

epm/config/config.go

+package config
+
+type Config struct {
+	// Root is the path to a directory where epm will store cache data
+	Root string `toml:"root"`
+	// GRPC configuration settings
+	GRPC GRPCConfig `toml:"grpc"`
+	// DBPath is the path of a database file
+	DBPath string `toml:"db_path"`
+	// DBTimeout is the amount of time to wait to obtain a database file lock.
+	DBTimeout int `toml:"db_timeout"`
+	// CachePools stores the configurations of cache pool managers
+	CachePools map[string]CachePool `toml:"cache_pools"`
+}
+
+// GRPCConfig provides GRPC configuration for the socket
+type GRPCConfig struct {
+	Address        string `toml:"address"`
+	TCPAddress     string `toml:"tcp_address"`
+	TCPTLSCert     string `toml:"tcp_tls_cert"`
+	TCPTLSKey      string `toml:"tcp_tls_key"`
+	UID            int    `toml:"uid"`
+	GID            int    `toml:"gid"`
+	MaxRecvMsgSize int    `toml:"max_recv_message_size"`
+	MaxSendMsgSize int    `toml:"max_send_message_size"`
+}
+
+// CachePool provides the configuration for the cache pool
+type CachePool struct {
+	Type string `toml:"type"`
+}

epm/config/config_test.go

+package config
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/BurntSushi/toml"
+)
+
+func TestDecodeConfig(t *testing.T) {
+	text := `
+root = "/var/local/epm"
+
+[grpc]
+  address = "/var/run/containerd/containerd.sock"
+  uid = 0
+  gid = 0
+  max_recv_message_size = 16777216
+  max_send_message_size = 16777216
+
+[cache_pools]
+  [cache_pools.bundle-cache-pool_occlum_cache0]
+    type = "bundle-cache-pool.occlum.cache0"
+  [cache_pools.bundle-cache-pool_occlum_cache1]
+    type = "bundle-cache-pool.occlum.cache1"
+  [cache_pools.bundle-cache-pool_occlum_cache2]
+    type = "bundle-cache-pool.occlum.cache2"
+`
+
+	var cfg Config
+	if _, err := toml.Decode(text, &cfg); err != nil {
+		t.Fatal(err)
+	}
+
+	for k, v := range cfg.CachePools {
+		fmt.Println(k)
+		fmt.Println(v.Type)
+	}
+
+	fmt.Printf("%#v", cfg)
+}

epm/go.mod

+module github.com/alibaba/inclavare-containers/epm
+
+go 1.13
+
+require (
+	github.com/BurntSushi/toml v0.3.1
+	github.com/boltdb/bolt v1.3.1
+	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
+	github.com/golang/protobuf v1.4.2
+	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
+	github.com/prometheus/procfs v0.0.5 // indirect
+	github.com/spf13/cobra v1.0.0
+	github.com/spf13/pflag v1.0.5
+	github.com/stretchr/testify v1.4.0 // indirect
+	golang.org/x/net v0.0.0-20191004110552-13f9640d40b9 // indirect
+	golang.org/x/sys v0.0.0-20200331124033-c3d80250170d // indirect
+	golang.org/x/text v0.3.2 // indirect
+	google.golang.org/grpc v1.28.0
+	google.golang.org/protobuf v1.23.0
+	gopkg.in/yaml.v2 v2.3.0 // indirect
+)

epm/go.sum

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epm/pkg/epm-api/v1alpha1/api.proto

+syntax = 'proto3';
+
+package v1alpha1;
+
+// Cache represents the metadata of a cache managed by cache pool manager.
+message Cache {
+    // Type represents the type of cache pool manager
+    string type = 1;
+    // ID represents the id of the cache and the id is unique in the same type of cache
+    string ID = 2;
+    // SavePath represents the absolute path to store the cache
+    string savePath = 3;
+    // Parent represents the parent cache of the current cache, if do not have a parent the value is nil
+    Cache parent = 4;
+    // Size represents the size in bytes of the cache
+    int64 size = 5;
+    // Created represents the creation time of the cache which is the number of seconds elapsed since January 1, 1970 UTC
+    int64 created = 6;
+}
+
+// CachePoolManager represents a cache pool manager.
+service CachePoolManager {
+    // GetCache represents get the specified cache metadata
+    rpc GetCache(GetCacheRequest) returns (GetCacheResponse) {}
+    // SaveCache represents save the data to a cache directory and record the cache metadata
+    rpc SaveCache(SaveCacheRequest) returns (SaveCacheResponse) {}
+    // ListCache represents list part of or all of the cache metadata
+    rpc ListCache(ListCacheRequest) returns (ListCacheResponse) {}
+    // DeleteCache represents delete the specified cached data and remove the corresponding cache metadata
+    rpc DeleteCache(DeleteCacheRequest) returns (DeleteCacheResponse) {}
+    // LoadCache represents load the specified cache data to work directory
+    rpc LoadCache(LoadCacheRequest) returns (LoadCacheResponse) {}
+}
+
+// GetCacheRequest
+message GetCacheRequest {
+    // Type represents the type of cache pool manager
+    string type = 1;
+    // ID represents the id of the cache
+    string ID = 2;
+}
+
+message GetCacheResponse {
+    // Cache represents the response cache metadata
+    Cache cache = 1;
+}
+
+message SaveCacheRequest {
+    // Cache represents the cache metadata needs to be saved
+    Cache cache = 1;
+    // SourcePath represents the absolute path of source cache data
+    string sourcePath = 2;
+}
+
+message SaveCacheResponse {
+    // Ok represents whether the cache is saved successfully
+    bool ok = 1;
+}
+
+message ListCacheRequest {
+    // Type represents the type of cache pool manager
+    string type = 1;
+    // LastCacheID represents the id of the last cache metadata in the most recent query list,
+    // if the value is "", query the cache metadata from the starting point of DB,
+    // otherwise query the cache metadata starting from the next id of `lastCacheID` in alphabetical order
+    string lastCacheID = 2;
+    // Limit represents the maximum number of queried entries
+    int32 limit = 3;
+}
+message ListCacheResponse {
+    // Caches represents the list of response caches
+    repeated Cache caches = 1;
+}
+
+message DeleteCacheRequest {
+    // Type represents the type of cache pool manager
+    string type = 1;
+    // ID represents the id of the cache
+    string ID = 2;
+}
+message DeleteCacheResponse {
+    // Ok represents whether the cache is deleted successfully
+    bool ok = 1;
+}
+
+message LoadCacheRequest {
+    // Type represents the type of cache pool manager
+    string type = 1;
+    // ID represents the id of the cache
+    string ID = 3;
+    // TargetPath represents the work directory for loading the cache data
+    string targetPath = 4;
+}
+message LoadCacheResponse {
+    // Ok represents whether the cache is loaded successfully
+    bool ok = 1;
+}
\ No newline at end of file

epm/pkg/epm-api/v1alpha1/api_grpc.pb.go

+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion6
+
+// CachePoolManagerClient is the client API for CachePoolManager service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type CachePoolManagerClient interface {
+	// GetCache represents get the specified cache metadata
+	GetCache(ctx context.Context, in *GetCacheRequest, opts ...grpc.CallOption) (*GetCacheResponse, error)
+	// SaveCache represents save the data to a cache directory and record the cache metadata
+	SaveCache(ctx context.Context, in *SaveCacheRequest, opts ...grpc.CallOption) (*SaveCacheResponse, error)
+	// ListCache represents list part of or all of the cache metadata
+	ListCache(ctx context.Context, in *ListCacheRequest, opts ...grpc.CallOption) (*ListCacheResponse, error)
+	// DeleteCache represents delete the specified cached data and remove the corresponding cache metadata
+	DeleteCache(ctx context.Context, in *DeleteCacheRequest, opts ...grpc.CallOption) (*DeleteCacheResponse, error)
+	// LoadCache represents load the specified cache data to work directory
+	LoadCache(ctx context.Context, in *LoadCacheRequest, opts ...grpc.CallOption) (*LoadCacheResponse, error)
+}
+
+type cachePoolManagerClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCachePoolManagerClient(cc grpc.ClientConnInterface) CachePoolManagerClient {
+	return &cachePoolManagerClient{cc}
+}
+
+func (c *cachePoolManagerClient) GetCache(ctx context.Context, in *GetCacheRequest, opts ...grpc.CallOption) (*GetCacheResponse, error) {
+	out := new(GetCacheResponse)
+	err := c.cc.Invoke(ctx, "/v1alpha1.CachePoolManager/GetCache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cachePoolManagerClient) SaveCache(ctx context.Context, in *SaveCacheRequest, opts ...grpc.CallOption) (*SaveCacheResponse, error) {
+	out := new(SaveCacheResponse)
+	err := c.cc.Invoke(ctx, "/v1alpha1.CachePoolManager/SaveCache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cachePoolManagerClient) ListCache(ctx context.Context, in *ListCacheRequest, opts ...grpc.CallOption) (*ListCacheResponse, error) {
+	out := new(ListCacheResponse)
+	err := c.cc.Invoke(ctx, "/v1alpha1.CachePoolManager/ListCache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cachePoolManagerClient) DeleteCache(ctx context.Context, in *DeleteCacheRequest, opts ...grpc.CallOption) (*DeleteCacheResponse, error) {
+	out := new(DeleteCacheResponse)
+	err := c.cc.Invoke(ctx, "/v1alpha1.CachePoolManager/DeleteCache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cachePoolManagerClient) LoadCache(ctx context.Context, in *LoadCacheRequest, opts ...grpc.CallOption) (*LoadCacheResponse, error) {
+	out := new(LoadCacheResponse)
+	err := c.cc.Invoke(ctx, "/v1alpha1.CachePoolManager/LoadCache", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CachePoolManagerServer is the server API for CachePoolManager service.
+// All implementations must embed UnimplementedCachePoolManagerServer
+// for forward compatibility
+type CachePoolManagerServer interface {
+	// GetCache represents get the specified cache metadata
+	GetCache(context.Context, *GetCacheRequest) (*GetCacheResponse, error)
+	// SaveCache represents save the data to a cache directory and record the cache metadata
+	SaveCache(context.Context, *SaveCacheRequest) (*SaveCacheResponse, error)
+	// ListCache represents list part of or all of the cache metadata
+	ListCache(context.Context, *ListCacheRequest) (*ListCacheResponse, error)
+	// DeleteCache represents delete the specified cached data and remove the corresponding cache metadata
+	DeleteCache(context.Context, *DeleteCacheRequest) (*DeleteCacheResponse, error)
+	// LoadCache represents load the specified cache data to work directory
+	LoadCache(context.Context, *LoadCacheRequest) (*LoadCacheResponse, error)
+	mustEmbedUnimplementedCachePoolManagerServer()
+}
+
+// UnimplementedCachePoolManagerServer must be embedded to have forward compatible implementations.
+type UnimplementedCachePoolManagerServer struct {
+}
+
+func (*UnimplementedCachePoolManagerServer) GetCache(context.Context, *GetCacheRequest) (*GetCacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetCache not implemented")
+}
+func (*UnimplementedCachePoolManagerServer) SaveCache(context.Context, *SaveCacheRequest) (*SaveCacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SaveCache not implemented")
+}
+func (*UnimplementedCachePoolManagerServer) ListCache(context.Context, *ListCacheRequest) (*ListCacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ListCache not implemented")
+}
+func (*UnimplementedCachePoolManagerServer) DeleteCache(context.Context, *DeleteCacheRequest) (*DeleteCacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method DeleteCache not implemented")
+}
+func (*UnimplementedCachePoolManagerServer) LoadCache(context.Context, *LoadCacheRequest) (*LoadCacheResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method LoadCache not implemented")
+}
+func (*UnimplementedCachePoolManagerServer) mustEmbedUnimplementedCachePoolManagerServer() {}
+
+func RegisterCachePoolManagerServer(s *grpc.Server, srv CachePoolManagerServer) {
+	s.RegisterService(&_CachePoolManager_serviceDesc, srv)
+}
+
+func _CachePoolManager_GetCache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetCacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CachePoolManagerServer).GetCache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v1alpha1.CachePoolManager/GetCache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CachePoolManagerServer).GetCache(ctx, req.(*GetCacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CachePoolManager_SaveCache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SaveCacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CachePoolManagerServer).SaveCache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v1alpha1.CachePoolManager/SaveCache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CachePoolManagerServer).SaveCache(ctx, req.(*SaveCacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CachePoolManager_ListCache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ListCacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CachePoolManagerServer).ListCache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v1alpha1.CachePoolManager/ListCache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CachePoolManagerServer).ListCache(ctx, req.(*ListCacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CachePoolManager_DeleteCache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(DeleteCacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CachePoolManagerServer).DeleteCache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v1alpha1.CachePoolManager/DeleteCache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CachePoolManagerServer).DeleteCache(ctx, req.(*DeleteCacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CachePoolManager_LoadCache_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(LoadCacheRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CachePoolManagerServer).LoadCache(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v1alpha1.CachePoolManager/LoadCache",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CachePoolManagerServer).LoadCache(ctx, req.(*LoadCacheRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _CachePoolManager_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "v1alpha1.CachePoolManager",
+	HandlerType: (*CachePoolManagerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GetCache",
+			Handler:    _CachePoolManager_GetCache_Handler,
+		},
+		{
+			MethodName: "SaveCache",
+			Handler:    _CachePoolManager_SaveCache_Handler,
+		},
+		{
+			MethodName: "ListCache",
+			Handler:    _CachePoolManager_ListCache_Handler,
+		},
+		{
+			MethodName: "DeleteCache",
+			Handler:    _CachePoolManager_DeleteCache_Handler,
+		},
+		{
+			MethodName: "LoadCache",
+			Handler:    _CachePoolManager_LoadCache_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "api.proto",
+}

epm/pkg/epm/bundle-cache-pool/occlum/cach-manager.go

+package occlum
+
+import (
+	cache_manager "github.com/alibaba/inclavare-containers/epm/pkg/epm"
+)
+
+type Cach0Manager struct {
+	cache_manager.DefaultCachePoolManager
+}
+
+func (d *Cach0Manager) GetCacheType() string {
+	return "bundle-cache-pool.occlum.cache0"
+}
+
+type Cach1Manager struct {
+	cache_manager.DefaultCachePoolManager
+}
+
+func (d *Cach1Manager) GetCacheType() string {
+	return "bundle-cache-pool.occlum.cache1"
+}
+
+type Cach2Manager struct {
+	cache_manager.DefaultCachePoolManager
+}
+
+func (d *Cach2Manager) GetCacheType() string {
+	return "bundle-cache-pool.occlum.cache2"
+}

epm/pkg/epm/emp-server.go

+package epm
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm-api/v1alpha1"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+// CachePoolManagerServer represents the service that manages the cache pool managers
+type CachePoolManagerServer struct {
+	v1alpha1.UnimplementedCachePoolManagerServer
+	// cachePoolManagers containers the mapping of the cache type and cache pool manager
+	cachePoolManagers map[string]CachePoolManager
+}
+
+// GetCache gets the specified cache metadata
+func (s *CachePoolManagerServer) GetCache(ctx context.Context, req *v1alpha1.GetCacheRequest) (*v1alpha1.GetCacheResponse, error) {
+	manager, err := s.getCachePoolManager(req.Type)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, err.Error())
+	}
+	cache, err := manager.GetCache(req.ID)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	return &v1alpha1.GetCacheResponse{Cache: cache}, nil
+}
+
+// SaveCache saves the data to a cache directory and record the cache metadata
+func (s *CachePoolManagerServer) SaveCache(ctx context.Context, req *v1alpha1.SaveCacheRequest) (*v1alpha1.SaveCacheResponse, error) {
+	cache := req.Cache
+	manager, err := s.getCachePoolManager(cache.Type)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, err.Error())
+	}
+	if err := manager.SaveCache(req.SourcePath, cache); err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	return &v1alpha1.SaveCacheResponse{Ok: true}, nil
+}
+
+// ListCache lists part of or all of the cache metadata
+func (s *CachePoolManagerServer) ListCache(ctx context.Context, req *v1alpha1.ListCacheRequest) (*v1alpha1.ListCacheResponse, error) {
+	manager, err := s.getCachePoolManager(req.Type)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, err.Error())
+	}
+	caches, err := manager.ListCache(req.LastCacheID, req.Limit)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	return &v1alpha1.ListCacheResponse{Caches: caches}, nil
+}
+
+// DeleteCache deletes the specified cached data and remove the corresponding cache metadata
+func (s *CachePoolManagerServer) DeleteCache(ctx context.Context, req *v1alpha1.DeleteCacheRequest) (*v1alpha1.DeleteCacheResponse, error) {
+	manager, err := s.getCachePoolManager(req.Type)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, err.Error())
+	}
+	if err := manager.DeleteCache(req.ID); err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	return &v1alpha1.DeleteCacheResponse{Ok: true}, nil
+}
+
+// LoadCache loads the specified cache data to work directory
+func (s *CachePoolManagerServer) LoadCache(ctx context.Context, req *v1alpha1.LoadCacheRequest) (*v1alpha1.LoadCacheResponse, error) {
+	manager, err := s.getCachePoolManager(req.Type)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, err.Error())
+	}
+	if err := manager.LoadCache(req.ID, req.TargetPath); err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+	return &v1alpha1.LoadCacheResponse{Ok: true}, nil
+}
+
+// RegistryCachePoolManager registry the cache pool manager to the cache pool manager server
+func (s *CachePoolManagerServer) RegistryCachePoolManager(m CachePoolManager) {
+	if s.cachePoolManagers == nil {
+		s.cachePoolManagers = make(map[string]CachePoolManager)
+	}
+	s.cachePoolManagers[m.GetCacheType()] = m
+}
+
+// getCachePoolManager gets the cache pool manager by the cache type
+func (s *CachePoolManagerServer) getCachePoolManager(cacheType string) (CachePoolManager, error) {
+	manager, ok := s.cachePoolManagers[cacheType]
+	if ok && manager != nil {
+		return manager, nil
+	}
+	return nil, fmt.Errorf("cachePoolManager is not found. cacheType: %s", cacheType)
+}

epm/pkg/epm/interface.go

+package epm
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/alibaba/inclavare-containers/epm/pkg/utils"
+
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm-api/v1alpha1"
+	cache_metadata "github.com/alibaba/inclavare-containers/epm/pkg/metadata"
+)
+
+// CachePoolManager represents a cache manager
+type CachePoolManager interface {
+	// GetCache gets the cache by ID
+	GetCache(ID string) (*v1alpha1.Cache, error)
+	// SaveCache saves the data to a cache directory and record the cache metadata
+	SaveCache(sourcePath string, cache *v1alpha1.Cache) error
+	// ListCache lists part of or all of the cache metadata
+	ListCache(lastCacheID string, limit int32) ([]*v1alpha1.Cache, error)
+	// DeleteCache deletes the specified cached data and remove the corresponding cache metadata
+	DeleteCache(ID string) error
+	// LoadCache loads the specified cache data to work directory
+	LoadCache(ID, targetPath string) error
+	// GetCacheType gets the cache type of current cache pool manager
+	GetCacheType() string
+}
+
+// DefaultCachePoolManager is the default implementation of CachePoolManager
+type DefaultCachePoolManager struct {
+	Root          string
+	CacheMetadata *cache_metadata.Metadata
+}
+
+func (d *DefaultCachePoolManager) GetCache(ID string) (*v1alpha1.Cache, error) {
+	return d.CacheMetadata.GetCache(d.GetCacheType(), ID)
+}
+
+func (d *DefaultCachePoolManager) SaveCache(sourcePath string, cache *v1alpha1.Cache) error {
+	savePath, err := d.BuildCacheSavePath(d.Root, cache)
+	if err != nil {
+		return err
+	}
+	if err := os.RemoveAll(savePath); err != nil {
+		return err
+	}
+	if err := os.MkdirAll(savePath, 755); err != nil {
+		return err
+	}
+	if _, err := utils.ExecCmd("/bin/cp", []string{"-fr", sourcePath, savePath}); err != nil {
+		return err
+	}
+	sizeStr, err := utils.ExecCmd("du", []string{"-sb", savePath, "|", "awk", "'{print $1}'"})
+	if err != nil {
+		return err
+	}
+	size, err := strconv.ParseInt(sizeStr, 10, 64)
+	if err != nil {
+		return err
+	}
+	cache.SavePath = savePath
+	cache.Size = size
+	cache.Created = time.Now().Unix()
+	return d.CacheMetadata.SaveCache(d.GetCacheType(), cache.ID, cache)
+}
+
+func (d *DefaultCachePoolManager) ListCache(lastCacheID string, limit int32) ([]*v1alpha1.Cache, error) {
+	return d.CacheMetadata.ListCache(d.GetCacheType(), lastCacheID, limit)
+}
+
+func (d *DefaultCachePoolManager) DeleteCache(ID string) error {
+	cache, err := d.GetCache(ID)
+	if err != nil {
+		return err
+	}
+	if err := os.RemoveAll(cache.SavePath); err != nil {
+		return err
+	}
+	return d.CacheMetadata.DeleteCache(d.GetCacheType(), ID)
+}
+
+func (d *DefaultCachePoolManager) LoadCache(ID, targetPath string) error {
+	cache, err := d.GetCache(ID)
+	if err != nil {
+		return err
+	}
+	if _, err := os.Stat(targetPath); err != nil {
+		return fmt.Errorf("target path is not exist. error: %++v", err)
+	}
+	if _, err := utils.ExecCmd("/bin/cp", []string{"-fr", fmt.Sprintf("%s/", cache.SavePath), targetPath}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *DefaultCachePoolManager) GetCacheType() string {
+	return "default"
+}
+
+func (d *DefaultCachePoolManager) BuildCacheSavePath(rootDir string, cache *v1alpha1.Cache) (string, error) {
+	caches, err := d.CacheMetadata.GetAncestorCaches(cache)
+	if err != nil {
+		return "", err
+	}
+	paths := []string{rootDir}
+	for index := len(caches) - 1; index >= 0; index-- {
+		cache := caches[index]
+		str := fmt.Sprintf("%s/%s", cache.Type, cache.ID)
+		paths = append(paths, str)
+	}
+	paths = append(paths, "current")
+	return strings.Join(paths, "/"), nil
+}

epm/pkg/gc/gc.go

+package gc

epm/pkg/metadata/metadata.go

+package metadata
+
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/alibaba/inclavare-containers/epm/pkg/epm-api/v1alpha1"
+	"github.com/boltdb/bolt"
+)
+
+// Metadata containers the DB used to store the cache metadata
+type Metadata struct {
+	db *bolt.DB
+}
+
+// NewMetadataServer open a DB connection
+func NewMetadataServer(DBPath string, timeout time.Duration) (*Metadata, error) {
+	db, err := bolt.Open(DBPath, 0600, &bolt.Options{Timeout: timeout})
+	if err != nil {
+		return nil, err
+	}
+	return &Metadata{db: db}, nil
+}
+
+// SaveCache saves the cache metadata to DB
+func (m *Metadata) SaveCache(bucket, key string, cache *v1alpha1.Cache) error {
+	return m.db.Update(func(tx *bolt.Tx) error {
+		b, err := tx.CreateBucketIfNotExists([]byte(bucket))
+		if err != nil {
+			return err
+		}
+		value, err := json.Marshal(cache)
+		if err != nil {
+			return err
+		}
+		return b.Put([]byte(key), value)
+	})
+}
+
+// DeleteCache deletes the cache metadata from DB
+func (m *Metadata) DeleteCache(bucket, key string) error {
+	return m.db.Update(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(bucket))
+		if b == nil {
+			return nil
+		}
+		return b.Delete([]byte(key))
+	})
+}
+
+// GetCache gets the cache metadata from DB
+func (m *Metadata) GetCache(bucket, key string) (*v1alpha1.Cache, error) {
+	cache := &v1alpha1.Cache{}
+	err := m.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(bucket))
+		if b == nil {
+			return nil
+		}
+		value := b.Get([]byte(key))
+		return json.Unmarshal(value, cache)
+	})
+	if err != nil {
+		return nil, err
+	}
+	return cache, nil
+}
+
+// ListCache lists the cache metadata from DB
+func (m *Metadata) ListCache(bucket, lastKey string, limit int32) ([]*v1alpha1.Cache, error) {
+	caches := make([]*v1alpha1.Cache, 0)
+	err := m.db.View(func(tx *bolt.Tx) error {
+		b := tx.Bucket([]byte(bucket))
+		if b == nil {
+			return nil
+		}
+		c := b.Cursor()
+		var k, v []byte
+		if lastKey != "" {
+			k, v = c.Seek([]byte(lastKey))
+		} else {
+			k, v = c.First()
+		}
+		var count int32
+		for ; k != nil && count < limit; k, v = c.Next() {
+			cache := &v1alpha1.Cache{}
+			if err := json.Unmarshal(v, cache); err != nil {
+				return err
+			}
+			caches = append(caches, cache)
+			count++
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return caches, nil
+}
+
+// Close closes the DB connections
+func (m *Metadata) Close() error {
+	return m.db.Close()
+}
+
+// GetAncestorCaches get the ancestor caches
+func (m *Metadata) GetAncestorCaches(cache *v1alpha1.Cache) ([]*v1alpha1.Cache, error) {
+	p := cache.Parent
+	caches := make([]*v1alpha1.Cache, 0)
+	for ; p != nil; p = p.Parent {
+		c, err := m.GetCache(p.Type, p.ID)
+		if err != nil {
+			return nil, err
+		}
+		caches = append(caches, c)
+	}
+	return caches, nil
+}

epm/pkg/utils/utils.go

+package utils
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func ExecCmd(cmd string, args []string) (string, error) {
+	c := exec.Command(cmd, args...)
+	b, err := c.Output()
+	if err != nil {
+		return "", fmt.Errorf("output: %s, error:%++v", string(b), err)
+	}
+	return string(b), nil
+}

epm/vendor/github.com/BurntSushi/toml/.gitignore

+TAGS
+tags
+.*.swp
+tomlcheck/tomlcheck
+toml.test

epm/vendor/github.com/BurntSushi/toml/.travis.yml

+language: go
+go:
+  - 1.1
+  - 1.2
+  - 1.3
+  - 1.4
+  - 1.5
+  - 1.6
+  - tip
+install:
+  - go install ./...
+  - go get github.com/BurntSushi/toml-test
+script:
+  - export PATH="$PATH:$HOME/gopath/bin"
+  - make test

epm/vendor/github.com/BurntSushi/toml/COMPATIBLE

+Compatible with TOML version
+[v0.4.0](https://github.com/toml-lang/toml/blob/v0.4.0/versions/en/toml-v0.4.0.md)
+

epm/vendor/github.com/BurntSushi/toml/COPYING

+The MIT License (MIT)
+
+Copyright (c) 2013 TOML authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

epm/vendor/github.com/BurntSushi/toml/Makefile

+install:
+	go install ./...
+
+test: install
+	go test -v
+	toml-test toml-test-decoder
+	toml-test -encoder toml-test-encoder
+
+fmt:
+	gofmt -w *.go */*.go
+	colcheck *.go */*.go
+
+tags:
+	find ./ -name '*.go' -print0 | xargs -0 gotags > TAGS
+
+push:
+	git push origin master
+	git push github master
+

epm/vendor/github.com/BurntSushi/toml/README.md

+## TOML parser and encoder for Go with reflection
+
+TOML stands for Tom's Obvious, Minimal Language. This Go package provides a
+reflection interface similar to Go's standard library `json` and `xml`
+packages. This package also supports the `encoding.TextUnmarshaler` and
+`encoding.TextMarshaler` interfaces so that you can define custom data
+representations. (There is an example of this below.)
+
+Spec: https://github.com/toml-lang/toml
+
+Compatible with TOML version
+[v0.4.0](https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.4.0.md)
+
+Documentation: https://godoc.org/github.com/BurntSushi/toml
+
+Installation:
+
+```bash
+go get github.com/BurntSushi/toml
+```
+
+Try the toml validator:
+
+```bash
+go get github.com/BurntSushi/toml/cmd/tomlv
+tomlv some-toml-file.toml
+```
+
+[![Build Status](https://travis-ci.org/BurntSushi/toml.svg?branch=master)](https://travis-ci.org/BurntSushi/toml) [![GoDoc](https://godoc.org/github.com/BurntSushi/toml?status.svg)](https://godoc.org/github.com/BurntSushi/toml)
+
+### Testing
+
+This package passes all tests in
+[toml-test](https://github.com/BurntSushi/toml-test) for both the decoder
+and the encoder.
+
+### Examples
+
+This package works similarly to how the Go standard library handles `XML`
+and `JSON`. Namely, data is loaded into Go values via reflection.
+
+For the simplest example, consider some TOML file as just a list of keys
+and values:
+
+```toml
+Age = 25
+Cats = [ "Cauchy", "Plato" ]
+Pi = 3.14
+Perfection = [ 6, 28, 496, 8128 ]
+DOB = 1987-07-05T05:45:00Z
+```
+
+Which could be defined in Go as:
+
+```go
+type Config struct {
+  Age int
+  Cats []string
+  Pi float64
+  Perfection []int
+  DOB time.Time // requires `import time`
+}
+```
+
+And then decoded with:
+
+```go
+var conf Config
+if _, err := toml.Decode(tomlData, &conf); err != nil {
+  // handle error
+}
+```
+
+You can also use struct tags if your struct field name doesn't map to a TOML
+key value directly:
+
+```toml
+some_key_NAME = "wat"
+```
+
+```go
+type TOML struct {
+  ObscureKey string `toml:"some_key_NAME"`
+}
+```
+
+### Using the `encoding.TextUnmarshaler` interface
+
+Here's an example that automatically parses duration strings into
+`time.Duration` values:
+
+```toml
+[[song]]
+name = "Thunder Road"
+duration = "4m49s"
+
+[[song]]
+name = "Stairway to Heaven"
+duration = "8m03s"
+```
+
+Which can be decoded with:
+
+```go
+type song struct {
+  Name     string
+  Duration duration
+}
+type songs struct {
+  Song []song
+}
+var favorites songs
+if _, err := toml.Decode(blob, &favorites); err != nil {
+  log.Fatal(err)
+}
+
+for _, s := range favorites.Song {
+  fmt.Printf("%s (%s)\n", s.Name, s.Duration)
+}
+```
+
+And you'll also need a `duration` type that satisfies the
+`encoding.TextUnmarshaler` interface:
+
+```go
+type duration struct {
+	time.Duration
+}
+
+func (d *duration) UnmarshalText(text []byte) error {
+	var err error
+	d.Duration, err = time.ParseDuration(string(text))
+	return err
+}
+```
+
+### More complex usage
+
+Here's an example of how to load the example from the official spec page:
+
+```toml
+# This is a TOML document. Boom.
+
+title = "TOML Example"
+
+[owner]
+name = "Tom Preston-Werner"
+organization = "GitHub"
+bio = "GitHub Cofounder & CEO\nLikes tater tots and beer."
+dob = 1979-05-27T07:32:00Z # First class dates? Why not?
+
+[database]
+server = "192.168.1.1"
+ports = [ 8001, 8001, 8002 ]
+connection_max = 5000
+enabled = true
+
+[servers]
+
+  # You can indent as you please. Tabs or spaces. TOML don't care.
+  [servers.alpha]
+  ip = "10.0.0.1"
+  dc = "eqdc10"
+
+  [servers.beta]
+  ip = "10.0.0.2"
+  dc = "eqdc10"
+
+[clients]
+data = [ ["gamma", "delta"], [1, 2] ] # just an update to make sure parsers support it
+
+# Line breaks are OK when inside arrays
+hosts = [
+  "alpha",
+  "omega"
+]
+```
+
+And the corresponding Go types are:
+
+```go
+type tomlConfig struct {
+	Title string
+	Owner ownerInfo
+	DB database `toml:"database"`
+	Servers map[string]server
+	Clients clients
+}
+
+type ownerInfo struct {
+	Name string
+	Org string `toml:"organization"`
+	Bio string
+	DOB time.Time
+}
+
+type database struct {
+	Server string
+	Ports []int
+	ConnMax int `toml:"connection_max"`
+	Enabled bool
+}
+
+type server struct {
+	IP string
+	DC string
+}
+
+type clients struct {
+	Data [][]interface{}
+	Hosts []string
+}
+```
+
+Note that a case insensitive match will be tried if an exact match can't be
+found.
+
+A working example of the above can be found in `_examples/example.{go,toml}`.

epm/vendor/github.com/BurntSushi/toml/decode.go

+package toml
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math"
+	"reflect"
+	"strings"
+	"time"
+)
+
+func e(format string, args ...interface{}) error {
+	return fmt.Errorf("toml: "+format, args...)
+}
+
+// Unmarshaler is the interface implemented by objects that can unmarshal a
+// TOML description of themselves.
+type Unmarshaler interface {
+	UnmarshalTOML(interface{}) error
+}
+
+// Unmarshal decodes the contents of `p` in TOML format into a pointer `v`.
+func Unmarshal(p []byte, v interface{}) error {
+	_, err := Decode(string(p), v)
+	return err
+}
+
+// Primitive is a TOML value that hasn't been decoded into a Go value.
+// When using the various `Decode*` functions, the type `Primitive` may
+// be given to any value, and its decoding will be delayed.
+//
+// A `Primitive` value can be decoded using the `PrimitiveDecode` function.
+//
+// The underlying representation of a `Primitive` value is subject to change.
+// Do not rely on it.
+//
+// N.B. Primitive values are still parsed, so using them will only avoid
+// the overhead of reflection. They can be useful when you don't know the
+// exact type of TOML data until run time.
+type Primitive struct {
+	undecoded interface{}
+	context   Key
+}
+
+// DEPRECATED!
+//
+// Use MetaData.PrimitiveDecode instead.
+func PrimitiveDecode(primValue Primitive, v interface{}) error {
+	md := MetaData{decoded: make(map[string]bool)}
+	return md.unify(primValue.undecoded, rvalue(v))
+}
+
+// PrimitiveDecode is just like the other `Decode*` functions, except it
+// decodes a TOML value that has already been parsed. Valid primitive values
+// can *only* be obtained from values filled by the decoder functions,
+// including this method. (i.e., `v` may contain more `Primitive`
+// values.)
+//
+// Meta data for primitive values is included in the meta data returned by
+// the `Decode*` functions with one exception: keys returned by the Undecoded
+// method will only reflect keys that were decoded. Namely, any keys hidden
+// behind a Primitive will be considered undecoded. Executing this method will
+// update the undecoded keys in the meta data. (See the example.)
+func (md *MetaData) PrimitiveDecode(primValue Primitive, v interface{}) error {
+	md.context = primValue.context
+	defer func() { md.context = nil }()
+	return md.unify(primValue.undecoded, rvalue(v))
+}
+
+// Decode will decode the contents of `data` in TOML format into a pointer
+// `v`.
+//
+// TOML hashes correspond to Go structs or maps. (Dealer's choice. They can be
+// used interchangeably.)
+//
+// TOML arrays of tables correspond to either a slice of structs or a slice
+// of maps.
+//
+// TOML datetimes correspond to Go `time.Time` values.
+//
+// All other TOML types (float, string, int, bool and array) correspond
+// to the obvious Go types.
+//
+// An exception to the above rules is if a type implements the
+// encoding.TextUnmarshaler interface. In this case, any primitive TOML value
+// (floats, strings, integers, booleans and datetimes) will be converted to
+// a byte string and given to the value's UnmarshalText method. See the
+// Unmarshaler example for a demonstration with time duration strings.
+//
+// Key mapping
+//
+// TOML keys can map to either keys in a Go map or field names in a Go
+// struct. The special `toml` struct tag may be used to map TOML keys to
+// struct fields that don't match the key name exactly. (See the example.)
+// A case insensitive match to struct names will be tried if an exact match
+// can't be found.
+//
+// The mapping between TOML values and Go values is loose. That is, there
+// may exist TOML values that cannot be placed into your representation, and
+// there may be parts of your representation that do not correspond to
+// TOML values. This loose mapping can be made stricter by using the IsDefined
+// and/or Undecoded methods on the MetaData returned.
+//
+// This decoder will not handle cyclic types. If a cyclic type is passed,
+// `Decode` will not terminate.
+func Decode(data string, v interface{}) (MetaData, error) {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() != reflect.Ptr {
+		return MetaData{}, e("Decode of non-pointer %s", reflect.TypeOf(v))
+	}
+	if rv.IsNil() {
+		return MetaData{}, e("Decode of nil %s", reflect.TypeOf(v))
+	}
+	p, err := parse(data)
+	if err != nil {
+		return MetaData{}, err
+	}
+	md := MetaData{
+		p.mapping, p.types, p.ordered,
+		make(map[string]bool, len(p.ordered)), nil,
+	}
+	return md, md.unify(p.mapping, indirect(rv))
+}
+
+// DecodeFile is just like Decode, except it will automatically read the
+// contents of the file at `fpath` and decode it for you.
+func DecodeFile(fpath string, v interface{}) (MetaData, error) {
+	bs, err := ioutil.ReadFile(fpath)
+	if err != nil {
+		return MetaData{}, err
+	}
+	return Decode(string(bs), v)
+}
+
+// DecodeReader is just like Decode, except it will consume all bytes
+// from the reader and decode it for you.
+func DecodeReader(r io.Reader, v interface{}) (MetaData, error) {
+	bs, err := ioutil.ReadAll(r)
+	if err != nil {
+		return MetaData{}, err
+	}
+	return Decode(string(bs), v)
+}
+
+// unify performs a sort of type unification based on the structure of `rv`,
+// which is the client representation.
+//
+// Any type mismatch produces an error. Finding a type that we don't know
+// how to handle produces an unsupported type error.
+func (md *MetaData) unify(data interface{}, rv reflect.Value) error {
+
+	// Special case. Look for a `Primitive` value.
+	if rv.Type() == reflect.TypeOf((*Primitive)(nil)).Elem() {
+		// Save the undecoded data and the key context into the primitive
+		// value.
+		context := make(Key, len(md.context))
+		copy(context, md.context)
+		rv.Set(reflect.ValueOf(Primitive{
+			undecoded: data,
+			context:   context,
+		}))
+		return nil
+	}
+
+	// Special case. Unmarshaler Interface support.
+	if rv.CanAddr() {
+		if v, ok := rv.Addr().Interface().(Unmarshaler); ok {
+			return v.UnmarshalTOML(data)
+		}
+	}
+
+	// Special case. Handle time.Time values specifically.
+	// TODO: Remove this code when we decide to drop support for Go 1.1.
+	// This isn't necessary in Go 1.2 because time.Time satisfies the encoding
+	// interfaces.
+	if rv.Type().AssignableTo(rvalue(time.Time{}).Type()) {
+		return md.unifyDatetime(data, rv)
+	}
+
+	// Special case. Look for a value satisfying the TextUnmarshaler interface.
+	if v, ok := rv.Interface().(TextUnmarshaler); ok {
+		return md.unifyText(data, v)
+	}
+	// BUG(burntsushi)
+	// The behavior here is incorrect whenever a Go type satisfies the
+	// encoding.TextUnmarshaler interface but also corresponds to a TOML
+	// hash or array. In particular, the unmarshaler should only be applied
+	// to primitive TOML values. But at this point, it will be applied to
+	// all kinds of values and produce an incorrect error whenever those values
+	// are hashes or arrays (including arrays of tables).
+
+	k := rv.Kind()
+
+	// laziness
+	if k >= reflect.Int && k <= reflect.Uint64 {
+		return md.unifyInt(data, rv)
+	}
+	switch k {
+	case reflect.Ptr:
+		elem := reflect.New(rv.Type().Elem())
+		err := md.unify(data, reflect.Indirect(elem))
+		if err != nil {
+			return err
+		}
+		rv.Set(elem)
+		return nil
+	case reflect.Struct:
+		return md.unifyStruct(data, rv)
+	case reflect.Map:
+		return md.unifyMap(data, rv)
+	case reflect.Array:
+		return md.unifyArray(data, rv)
+	case reflect.Slice:
+		return md.unifySlice(data, rv)
+	case reflect.String:
+		return md.unifyString(data, rv)
+	case reflect.Bool:
+		return md.unifyBool(data, rv)
+	case reflect.Interface:
+		// we only support empty interfaces.
+		if rv.NumMethod() > 0 {
+			return e("unsupported type %s", rv.Type())
+		}
+		return md.unifyAnything(data, rv)
+	case reflect.Float32:
+		fallthrough
+	case reflect.Float64:
+		return md.unifyFloat64(data, rv)
+	}
+	return e("unsupported type %s", rv.Kind())
+}
+
+func (md *MetaData) unifyStruct(mapping interface{}, rv reflect.Value) error {
+	tmap, ok := mapping.(map[string]interface{})
+	if !ok {
+		if mapping == nil {
+			return nil
+		}
+		return e("type mismatch for %s: expected table but found %T",
+			rv.Type().String(), mapping)
+	}
+
+	for key, datum := range tmap {
+		var f *field
+		fields := cachedTypeFields(rv.Type())
+		for i := range fields {
+			ff := &fields[i]
+			if ff.name == key {
+				f = ff
+				break
+			}
+			if f == nil && strings.EqualFold(ff.name, key) {
+				f = ff
+			}
+		}
+		if f != nil {
+			subv := rv
+			for _, i := range f.index {
+				subv = indirect(subv.Field(i))
+			}
+			if isUnifiable(subv) {
+				md.decoded[md.context.add(key).String()] = true
+				md.context = append(md.context, key)
+				if err := md.unify(datum, subv); err != nil {
+					return err
+				}
+				md.context = md.context[0 : len(md.context)-1]
+			} else if f.name != "" {
+				// Bad user! No soup for you!
+				return e("cannot write unexported field %s.%s",
+					rv.Type().String(), f.name)
+			}
+		}
+	}
+	return nil
+}
+
+func (md *MetaData) unifyMap(mapping interface{}, rv reflect.Value) error {
+	tmap, ok := mapping.(map[string]interface{})
+	if !ok {
+		if tmap == nil {
+			return nil
+		}
+		return badtype("map", mapping)
+	}
+	if rv.IsNil() {
+		rv.Set(reflect.MakeMap(rv.Type()))
+	}
+	for k, v := range tmap {
+		md.decoded[md.context.add(k).String()] = true
+		md.context = append(md.context, k)
+
+		rvkey := indirect(reflect.New(rv.Type().Key()))
+		rvval := reflect.Indirect(reflect.New(rv.Type().Elem()))
+		if err := md.unify(v, rvval); err != nil {
+			return err
+		}
+		md.context = md.context[0 : len(md.context)-1]
+
+		rvkey.SetString(k)
+		rv.SetMapIndex(rvkey, rvval)
+	}
+	return nil
+}
+
+func (md *MetaData) unifyArray(data interface{}, rv reflect.Value) error {
+	datav := reflect.ValueOf(data)
+	if datav.Kind() != reflect.Slice {
+		if !datav.IsValid() {
+			return nil
+		}
+		return badtype("slice", data)
+	}
+	sliceLen := datav.Len()
+	if sliceLen != rv.Len() {
+		return e("expected array length %d; got TOML array of length %d",
+			rv.Len(), sliceLen)
+	}
+	return md.unifySliceArray(datav, rv)
+}
+
+func (md *MetaData) unifySlice(data interface{}, rv reflect.Value) error {
+	datav := reflect.ValueOf(data)
+	if datav.Kind() != reflect.Slice {
+		if !datav.IsValid() {
+			return nil
+		}
+		return badtype("slice", data)
+	}
+	n := datav.Len()
+	if rv.IsNil() || rv.Cap() < n {
+		rv.Set(reflect.MakeSlice(rv.Type(), n, n))
+	}
+	rv.SetLen(n)
+	return md.unifySliceArray(datav, rv)
+}
+
+func (md *MetaData) unifySliceArray(data, rv reflect.Value) error {
+	sliceLen := data.Len()
+	for i := 0; i < sliceLen; i++ {
+		v := data.Index(i).Interface()
+		sliceval := indirect(rv.Index(i))
+		if err := md.unify(v, sliceval); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (md *MetaData) unifyDatetime(data interface{}, rv reflect.Value) error {
+	if _, ok := data.(time.Time); ok {
+		rv.Set(reflect.ValueOf(data))
+		return nil
+	}
+	return badtype("time.Time", data)
+}
+
+func (md *MetaData) unifyString(data interface{}, rv reflect.Value) error {
+	if s, ok := data.(string); ok {
+		rv.SetString(s)
+		return nil
+	}
+	return badtype("string", data)
+}
+
+func (md *MetaData) unifyFloat64(data interface{}, rv reflect.Value) error {
+	if num, ok := data.(float64); ok {
+		switch rv.Kind() {
+		case reflect.Float32:
+			fallthrough
+		case reflect.Float64:
+			rv.SetFloat(num)
+		default:
+			panic("bug")
+		}
+		return nil
+	}
+	return badtype("float", data)
+}
+
+func (md *MetaData) unifyInt(data interface{}, rv reflect.Value) error {
+	if num, ok := data.(int64); ok {
+		if rv.Kind() >= reflect.Int && rv.Kind() <= reflect.Int64 {
+			switch rv.Kind() {
+			case reflect.Int, reflect.Int64:
+				// No bounds checking necessary.
+			case reflect.Int8:
+				if num < math.MinInt8 || num > math.MaxInt8 {
+					return e("value %d is out of range for int8", num)
+				}
+			case reflect.Int16:
+				if num < math.MinInt16 || num > math.MaxInt16 {
+					return e("value %d is out of range for int16", num)
+				}
+			case reflect.Int32:
+				if num < math.MinInt32 || num > math.MaxInt32 {
+					return e("value %d is out of range for int32", num)
+				}
+			}
+			rv.SetInt(num)
+		} else if rv.Kind() >= reflect.Uint && rv.Kind() <= reflect.Uint64 {
+			unum := uint64(num)
+			switch rv.Kind() {
+			case reflect.Uint, reflect.Uint64:
+				// No bounds checking necessary.
+			case reflect.Uint8:
+				if num < 0 || unum > math.MaxUint8 {
+					return e("value %d is out of range for uint8", num)
+				}
+			case reflect.Uint16:
+				if num < 0 || unum > math.MaxUint16 {
+					return e("value %d is out of range for uint16", num)
+				}
+			case reflect.Uint32:
+				if num < 0 || unum > math.MaxUint32 {
+					return e("value %d is out of range for uint32", num)
+				}
+			}
+			rv.SetUint(unum)
+		} else {
+			panic("unreachable")
+		}
+		return nil
+	}
+	return badtype("integer", data)
+}
+
+func (md *MetaData) unifyBool(data interface{}, rv reflect.Value) error {
+	if b, ok := data.(bool); ok {
+		rv.SetBool(b)
+		return nil
+	}
+	return badtype("boolean", data)
+}
+
+func (md *MetaData) unifyAnything(data interface{}, rv reflect.Value) error {
+	rv.Set(reflect.ValueOf(data))
+	return nil
+}
+
+func (md *MetaData) unifyText(data interface{}, v TextUnmarshaler) error {
+	var s string
+	switch sdata := data.(type) {
+	case TextMarshaler:
+		text, err := sdata.MarshalText()
+		if err != nil {
+			return err
+		}
+		s = string(text)
+	case fmt.Stringer:
+		s = sdata.String()
+	case string:
+		s = sdata
+	case bool:
+		s = fmt.Sprintf("%v", sdata)
+	case int64:
+		s = fmt.Sprintf("%d", sdata)
+	case float64:
+		s = fmt.Sprintf("%f", sdata)
+	default:
+		return badtype("primitive (string-like)", data)
+	}
+	if err := v.UnmarshalText([]byte(s)); err != nil {
+		return err
+	}
+	return nil
+}
+
+// rvalue returns a reflect.Value of `v`. All pointers are resolved.
+func rvalue(v interface{}) reflect.Value {
+	return indirect(reflect.ValueOf(v))
+}
+
+// indirect returns the value pointed to by a pointer.
+// Pointers are followed until the value is not a pointer.
+// New values are allocated for each nil pointer.
+//
+// An exception to this rule is if the value satisfies an interface of
+// interest to us (like encoding.TextUnmarshaler).
+func indirect(v reflect.Value) reflect.Value {
+	if v.Kind() != reflect.Ptr {
+		if v.CanSet() {
+			pv := v.Addr()
+			if _, ok := pv.Interface().(TextUnmarshaler); ok {
+				return pv
+			}
+		}
+		return v
+	}
+	if v.IsNil() {
+		v.Set(reflect.New(v.Type().Elem()))
+	}
+	return indirect(reflect.Indirect(v))
+}
+
+func isUnifiable(rv reflect.Value) bool {
+	if rv.CanSet() {
+		return true
+	}
+	if _, ok := rv.Interface().(TextUnmarshaler); ok {
+		return true
+	}
+	return false
+}
+
+func badtype(expected string, data interface{}) error {
+	return e("cannot load TOML value of type %T into a Go %s", data, expected)
+}

epm/vendor/github.com/BurntSushi/toml/decode_meta.go

+package toml
+
+import "strings"
+
+// MetaData allows access to meta information about TOML data that may not
+// be inferrable via reflection. In particular, whether a key has been defined
+// and the TOML type of a key.
+type MetaData struct {
+	mapping map[string]interface{}
+	types   map[string]tomlType
+	keys    []Key
+	decoded map[string]bool
+	context Key // Used only during decoding.
+}
+
+// IsDefined returns true if the key given exists in the TOML data. The key
+// should be specified hierarchially. e.g.,
+//
+//	// access the TOML key 'a.b.c'
+//	IsDefined("a", "b", "c")
+//
+// IsDefined will return false if an empty key given. Keys are case sensitive.
+func (md *MetaData) IsDefined(key ...string) bool {
+	if len(key) == 0 {
+		return false
+	}
+
+	var hash map[string]interface{}
+	var ok bool
+	var hashOrVal interface{} = md.mapping
+	for _, k := range key {
+		if hash, ok = hashOrVal.(map[string]interface{}); !ok {
+			return false
+		}
+		if hashOrVal, ok = hash[k]; !ok {
+			return false
+		}
+	}
+	return true
+}
+
+// Type returns a string representation of the type of the key specified.
+//
+// Type will return the empty string if given an empty key or a key that
+// does not exist. Keys are case sensitive.
+func (md *MetaData) Type(key ...string) string {
+	fullkey := strings.Join(key, ".")
+	if typ, ok := md.types[fullkey]; ok {
+		return typ.typeString()
+	}
+	return ""
+}
+
+// Key is the type of any TOML key, including key groups. Use (MetaData).Keys
+// to get values of this type.
+type Key []string
+
+func (k Key) String() string {
+	return strings.Join(k, ".")
+}
+
+func (k Key) maybeQuotedAll() string {
+	var ss []string
+	for i := range k {
+		ss = append(ss, k.maybeQuoted(i))
+	}
+	return strings.Join(ss, ".")
+}
+
+func (k Key) maybeQuoted(i int) string {
+	quote := false
+	for _, c := range k[i] {
+		if !isBareKeyChar(c) {
+			quote = true
+			break
+		}
+	}
+	if quote {
+		return "\"" + strings.Replace(k[i], "\"", "\\\"", -1) + "\""
+	}
+	return k[i]
+}
+
+func (k Key) add(piece string) Key {
+	newKey := make(Key, len(k)+1)
+	copy(newKey, k)
+	newKey[len(k)] = piece
+	return newKey
+}
+
+// Keys returns a slice of every key in the TOML data, including key groups.
+// Each key is itself a slice, where the first element is the top of the
+// hierarchy and the last is the most specific.
+//
+// The list will have the same order as the keys appeared in the TOML data.
+//
+// All keys returned are non-empty.
+func (md *MetaData) Keys() []Key {
+	return md.keys
+}
+
+// Undecoded returns all keys that have not been decoded in the order in which
+// they appear in the original TOML document.
+//
+// This includes keys that haven't been decoded because of a Primitive value.
+// Once the Primitive value is decoded, the keys will be considered decoded.
+//
+// Also note that decoding into an empty interface will result in no decoding,
+// and so no keys will be considered decoded.
+//
+// In this sense, the Undecoded keys correspond to keys in the TOML document
+// that do not have a concrete type in your representation.
+func (md *MetaData) Undecoded() []Key {
+	undecoded := make([]Key, 0, len(md.keys))
+	for _, key := range md.keys {
+		if !md.decoded[key.String()] {
+			undecoded = append(undecoded, key)
+		}
+	}
+	return undecoded
+}

epm/vendor/github.com/BurntSushi/toml/doc.go

+/*
+Package toml provides facilities for decoding and encoding TOML configuration
+files via reflection. There is also support for delaying decoding with
+the Primitive type, and querying the set of keys in a TOML document with the
+MetaData type.
+
+The specification implemented: https://github.com/toml-lang/toml
+
+The sub-command github.com/BurntSushi/toml/cmd/tomlv can be used to verify
+whether a file is a valid TOML document. It can also be used to print the
+type of each key in a TOML document.
+
+Testing
+
+There are two important types of tests used for this package. The first is
+contained inside '*_test.go' files and uses the standard Go unit testing
+framework. These tests are primarily devoted to holistically testing the
+decoder and encoder.
+
+The second type of testing is used to verify the implementation's adherence
+to the TOML specification. These tests have been factored into their own
+project: https://github.com/BurntSushi/toml-test
+
+The reason the tests are in a separate project is so that they can be used by
+any implementation of TOML. Namely, it is language agnostic.
+*/
+package toml

epm/vendor/github.com/BurntSushi/toml/encode.go

+package toml
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"reflect"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type tomlEncodeError struct{ error }
+
+var (
+	errArrayMixedElementTypes = errors.New(
+		"toml: cannot encode array with mixed element types")
+	errArrayNilElement = errors.New(
+		"toml: cannot encode array with nil element")
+	errNonString = errors.New(
+		"toml: cannot encode a map with non-string key type")
+	errAnonNonStruct = errors.New(
+		"toml: cannot encode an anonymous field that is not a struct")
+	errArrayNoTable = errors.New(
+		"toml: TOML array element cannot contain a table")
+	errNoKey = errors.New(
+		"toml: top-level values must be Go maps or structs")
+	errAnything = errors.New("") // used in testing
+)
+
+var quotedReplacer = strings.NewReplacer(
+	"\t", "\\t",
+	"\n", "\\n",
+	"\r", "\\r",
+	"\"", "\\\"",
+	"\\", "\\\\",
+)
+
+// Encoder controls the encoding of Go values to a TOML document to some
+// io.Writer.
+//
+// The indentation level can be controlled with the Indent field.
+type Encoder struct {
+	// A single indentation level. By default it is two spaces.
+	Indent string
+
+	// hasWritten is whether we have written any output to w yet.
+	hasWritten bool
+	w          *bufio.Writer
+}
+
+// NewEncoder returns a TOML encoder that encodes Go values to the io.Writer
+// given. By default, a single indentation level is 2 spaces.
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{
+		w:      bufio.NewWriter(w),
+		Indent: "  ",
+	}
+}
+
+// Encode writes a TOML representation of the Go value to the underlying
+// io.Writer. If the value given cannot be encoded to a valid TOML document,
+// then an error is returned.
+//
+// The mapping between Go values and TOML values should be precisely the same
+// as for the Decode* functions. Similarly, the TextMarshaler interface is
+// supported by encoding the resulting bytes as strings. (If you want to write
+// arbitrary binary data then you will need to use something like base64 since
+// TOML does not have any binary types.)
+//
+// When encoding TOML hashes (i.e., Go maps or structs), keys without any
+// sub-hashes are encoded first.
+//
+// If a Go map is encoded, then its keys are sorted alphabetically for
+// deterministic output. More control over this behavior may be provided if
+// there is demand for it.
+//
+// Encoding Go values without a corresponding TOML representation---like map
+// types with non-string keys---will cause an error to be returned. Similarly
+// for mixed arrays/slices, arrays/slices with nil elements, embedded
+// non-struct types and nested slices containing maps or structs.
+// (e.g., [][]map[string]string is not allowed but []map[string]string is OK
+// and so is []map[string][]string.)
+func (enc *Encoder) Encode(v interface{}) error {
+	rv := eindirect(reflect.ValueOf(v))
+	if err := enc.safeEncode(Key([]string{}), rv); err != nil {
+		return err
+	}
+	return enc.w.Flush()
+}
+
+func (enc *Encoder) safeEncode(key Key, rv reflect.Value) (err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			if terr, ok := r.(tomlEncodeError); ok {
+				err = terr.error
+				return
+			}
+			panic(r)
+		}
+	}()
+	enc.encode(key, rv)
+	return nil
+}
+
+func (enc *Encoder) encode(key Key, rv reflect.Value) {
+	// Special case. Time needs to be in ISO8601 format.
+	// Special case. If we can marshal the type to text, then we used that.
+	// Basically, this prevents the encoder for handling these types as
+	// generic structs (or whatever the underlying type of a TextMarshaler is).
+	switch rv.Interface().(type) {
+	case time.Time, TextMarshaler:
+		enc.keyEqElement(key, rv)
+		return
+	}
+
+	k := rv.Kind()
+	switch k {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32,
+		reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32,
+		reflect.Uint64,
+		reflect.Float32, reflect.Float64, reflect.String, reflect.Bool:
+		enc.keyEqElement(key, rv)
+	case reflect.Array, reflect.Slice:
+		if typeEqual(tomlArrayHash, tomlTypeOfGo(rv)) {
+			enc.eArrayOfTables(key, rv)
+		} else {
+			enc.keyEqElement(key, rv)
+		}
+	case reflect.Interface:
+		if rv.IsNil() {
+			return
+		}
+		enc.encode(key, rv.Elem())
+	case reflect.Map:
+		if rv.IsNil() {
+			return
+		}
+		enc.eTable(key, rv)
+	case reflect.Ptr:
+		if rv.IsNil() {
+			return
+		}
+		enc.encode(key, rv.Elem())
+	case reflect.Struct:
+		enc.eTable(key, rv)
+	default:
+		panic(e("unsupported type for key '%s': %s", key, k))
+	}
+}
+
+// eElement encodes any value that can be an array element (primitives and
+// arrays).
+func (enc *Encoder) eElement(rv reflect.Value) {
+	switch v := rv.Interface().(type) {
+	case time.Time:
+		// Special case time.Time as a primitive. Has to come before
+		// TextMarshaler below because time.Time implements
+		// encoding.TextMarshaler, but we need to always use UTC.
+		enc.wf(v.UTC().Format("2006-01-02T15:04:05Z"))
+		return
+	case TextMarshaler:
+		// Special case. Use text marshaler if it's available for this value.
+		if s, err := v.MarshalText(); err != nil {
+			encPanic(err)
+		} else {
+			enc.writeQuoted(string(s))
+		}
+		return
+	}
+	switch rv.Kind() {
+	case reflect.Bool:
+		enc.wf(strconv.FormatBool(rv.Bool()))
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32,
+		reflect.Int64:
+		enc.wf(strconv.FormatInt(rv.Int(), 10))
+	case reflect.Uint, reflect.Uint8, reflect.Uint16,
+		reflect.Uint32, reflect.Uint64:
+		enc.wf(strconv.FormatUint(rv.Uint(), 10))
+	case reflect.Float32:
+		enc.wf(floatAddDecimal(strconv.FormatFloat(rv.Float(), 'f', -1, 32)))
+	case reflect.Float64:
+		enc.wf(floatAddDecimal(strconv.FormatFloat(rv.Float(), 'f', -1, 64)))
+	case reflect.Array, reflect.Slice:
+		enc.eArrayOrSliceElement(rv)
+	case reflect.Interface:
+		enc.eElement(rv.Elem())
+	case reflect.String:
+		enc.writeQuoted(rv.String())
+	default:
+		panic(e("unexpected primitive type: %s", rv.Kind()))
+	}
+}
+
+// By the TOML spec, all floats must have a decimal with at least one
+// number on either side.
+func floatAddDecimal(fstr string) string {
+	if !strings.Contains(fstr, ".") {
+		return fstr + ".0"
+	}
+	return fstr
+}
+
+func (enc *Encoder) writeQuoted(s string) {
+	enc.wf("\"%s\"", quotedReplacer.Replace(s))
+}
+
+func (enc *Encoder) eArrayOrSliceElement(rv reflect.Value) {
+	length := rv.Len()
+	enc.wf("[")
+	for i := 0; i < length; i++ {
+		elem := rv.Index(i)
+		enc.eElement(elem)
+		if i != length-1 {
+			enc.wf(", ")
+		}
+	}
+	enc.wf("]")
+}
+
+func (enc *Encoder) eArrayOfTables(key Key, rv reflect.Value) {
+	if len(key) == 0 {
+		encPanic(errNoKey)
+	}
+	for i := 0; i < rv.Len(); i++ {
+		trv := rv.Index(i)
+		if isNil(trv) {
+			continue
+		}
+		panicIfInvalidKey(key)
+		enc.newline()
+		enc.wf("%s[[%s]]", enc.indentStr(key), key.maybeQuotedAll())
+		enc.newline()
+		enc.eMapOrStruct(key, trv)
+	}
+}
+
+func (enc *Encoder) eTable(key Key, rv reflect.Value) {
+	panicIfInvalidKey(key)
+	if len(key) == 1 {
+		// Output an extra newline between top-level tables.
+		// (The newline isn't written if nothing else has been written though.)
+		enc.newline()
+	}
+	if len(key) > 0 {
+		enc.wf("%s[%s]", enc.indentStr(key), key.maybeQuotedAll())
+		enc.newline()
+	}
+	enc.eMapOrStruct(key, rv)
+}
+
+func (enc *Encoder) eMapOrStruct(key Key, rv reflect.Value) {
+	switch rv := eindirect(rv); rv.Kind() {
+	case reflect.Map:
+		enc.eMap(key, rv)
+	case reflect.Struct:
+		enc.eStruct(key, rv)
+	default:
+		panic("eTable: unhandled reflect.Value Kind: " + rv.Kind().String())
+	}
+}
+
+func (enc *Encoder) eMap(key Key, rv reflect.Value) {
+	rt := rv.Type()
+	if rt.Key().Kind() != reflect.String {
+		encPanic(errNonString)
+	}
+
+	// Sort keys so that we have deterministic output. And write keys directly
+	// underneath this key first, before writing sub-structs or sub-maps.
+	var mapKeysDirect, mapKeysSub []string
+	for _, mapKey := range rv.MapKeys() {
+		k := mapKey.String()
+		if typeIsHash(tomlTypeOfGo(rv.MapIndex(mapKey))) {
+			mapKeysSub = append(mapKeysSub, k)
+		} else {
+			mapKeysDirect = append(mapKeysDirect, k)
+		}
+	}
+
+	var writeMapKeys = func(mapKeys []string) {
+		sort.Strings(mapKeys)
+		for _, mapKey := range mapKeys {
+			mrv := rv.MapIndex(reflect.ValueOf(mapKey))
+			if isNil(mrv) {
+				// Don't write anything for nil fields.
+				continue
+			}
+			enc.encode(key.add(mapKey), mrv)
+		}
+	}
+	writeMapKeys(mapKeysDirect)
+	writeMapKeys(mapKeysSub)
+}
+
+func (enc *Encoder) eStruct(key Key, rv reflect.Value) {
+	// Write keys for fields directly under this key first, because if we write
+	// a field that creates a new table, then all keys under it will be in that
+	// table (not the one we're writing here).
+	rt := rv.Type()
+	var fieldsDirect, fieldsSub [][]int
+	var addFields func(rt reflect.Type, rv reflect.Value, start []int)
+	addFields = func(rt reflect.Type, rv reflect.Value, start []int) {
+		for i := 0; i < rt.NumField(); i++ {
+			f := rt.Field(i)
+			// skip unexported fields
+			if f.PkgPath != "" && !f.Anonymous {
+				continue
+			}
+			frv := rv.Field(i)
+			if f.Anonymous {
+				t := f.Type
+				switch t.Kind() {
+				case reflect.Struct:
+					// Treat anonymous struct fields with
+					// tag names as though they are not
+					// anonymous, like encoding/json does.
+					if getOptions(f.Tag).name == "" {
+						addFields(t, frv, f.Index)
+						continue
+					}
+				case reflect.Ptr:
+					if t.Elem().Kind() == reflect.Struct &&
+						getOptions(f.Tag).name == "" {
+						if !frv.IsNil() {
+							addFields(t.Elem(), frv.Elem(), f.Index)
+						}
+						continue
+					}
+					// Fall through to the normal field encoding logic below
+					// for non-struct anonymous fields.
+				}
+			}
+
+			if typeIsHash(tomlTypeOfGo(frv)) {
+				fieldsSub = append(fieldsSub, append(start, f.Index...))
+			} else {
+				fieldsDirect = append(fieldsDirect, append(start, f.Index...))
+			}
+		}
+	}
+	addFields(rt, rv, nil)
+
+	var writeFields = func(fields [][]int) {
+		for _, fieldIndex := range fields {
+			sft := rt.FieldByIndex(fieldIndex)
+			sf := rv.FieldByIndex(fieldIndex)
+			if isNil(sf) {
+				// Don't write anything for nil fields.
+				continue
+			}
+
+			opts := getOptions(sft.Tag)
+			if opts.skip {
+				continue
+			}
+			keyName := sft.Name
+			if opts.name != "" {
+				keyName = opts.name
+			}
+			if opts.omitempty && isEmpty(sf) {
+				continue
+			}
+			if opts.omitzero && isZero(sf) {
+				continue
+			}
+
+			enc.encode(key.add(keyName), sf)
+		}
+	}
+	writeFields(fieldsDirect)
+	writeFields(fieldsSub)
+}
+
+// tomlTypeName returns the TOML type name of the Go value's type. It is
+// used to determine whether the types of array elements are mixed (which is
+// forbidden). If the Go value is nil, then it is illegal for it to be an array
+// element, and valueIsNil is returned as true.
+
+// Returns the TOML type of a Go value. The type may be `nil`, which means
+// no concrete TOML type could be found.
+func tomlTypeOfGo(rv reflect.Value) tomlType {
+	if isNil(rv) || !rv.IsValid() {
+		return nil
+	}
+	switch rv.Kind() {
+	case reflect.Bool:
+		return tomlBool
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32,
+		reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32,
+		reflect.Uint64:
+		return tomlInteger
+	case reflect.Float32, reflect.Float64:
+		return tomlFloat
+	case reflect.Array, reflect.Slice:
+		if typeEqual(tomlHash, tomlArrayType(rv)) {
+			return tomlArrayHash
+		}
+		return tomlArray
+	case reflect.Ptr, reflect.Interface:
+		return tomlTypeOfGo(rv.Elem())
+	case reflect.String:
+		return tomlString
+	case reflect.Map:
+		return tomlHash
+	case reflect.Struct:
+		switch rv.Interface().(type) {
+		case time.Time:
+			return tomlDatetime
+		case TextMarshaler:
+			return tomlString
+		default:
+			return tomlHash
+		}
+	default:
+		panic("unexpected reflect.Kind: " + rv.Kind().String())
+	}
+}
+
+// tomlArrayType returns the element type of a TOML array. The type returned
+// may be nil if it cannot be determined (e.g., a nil slice or a zero length
+// slize). This function may also panic if it finds a type that cannot be
+// expressed in TOML (such as nil elements, heterogeneous arrays or directly
+// nested arrays of tables).
+func tomlArrayType(rv reflect.Value) tomlType {
+	if isNil(rv) || !rv.IsValid() || rv.Len() == 0 {
+		return nil
+	}
+	firstType := tomlTypeOfGo(rv.Index(0))
+	if firstType == nil {
+		encPanic(errArrayNilElement)
+	}
+
+	rvlen := rv.Len()
+	for i := 1; i < rvlen; i++ {
+		elem := rv.Index(i)
+		switch elemType := tomlTypeOfGo(elem); {
+		case elemType == nil:
+			encPanic(errArrayNilElement)
+		case !typeEqual(firstType, elemType):
+			encPanic(errArrayMixedElementTypes)
+		}
+	}
+	// If we have a nested array, then we must make sure that the nested
+	// array contains ONLY primitives.
+	// This checks arbitrarily nested arrays.
+	if typeEqual(firstType, tomlArray) || typeEqual(firstType, tomlArrayHash) {
+		nest := tomlArrayType(eindirect(rv.Index(0)))
+		if typeEqual(nest, tomlHash) || typeEqual(nest, tomlArrayHash) {
+			encPanic(errArrayNoTable)
+		}
+	}
+	return firstType
+}
+
+type tagOptions struct {
+	skip      bool // "-"
+	name      string
+	omitempty bool
+	omitzero  bool
+}
+
+func getOptions(tag reflect.StructTag) tagOptions {
+	t := tag.Get("toml")
+	if t == "-" {
+		return tagOptions{skip: true}
+	}
+	var opts tagOptions
+	parts := strings.Split(t, ",")
+	opts.name = parts[0]
+	for _, s := range parts[1:] {
+		switch s {
+		case "omitempty":
+			opts.omitempty = true
+		case "omitzero":
+			opts.omitzero = true
+		}
+	}
+	return opts
+}
+
+func isZero(rv reflect.Value) bool {
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return rv.Int() == 0
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return rv.Uint() == 0
+	case reflect.Float32, reflect.Float64:
+		return rv.Float() == 0.0
+	}
+	return false
+}
+
+func isEmpty(rv reflect.Value) bool {
+	switch rv.Kind() {
+	case reflect.Array, reflect.Slice, reflect.Map, reflect.String:
+		return rv.Len() == 0
+	case reflect.Bool:
+		return !rv.Bool()
+	}
+	return false
+}
+
+func (enc *Encoder) newline() {
+	if enc.hasWritten {
+		enc.wf("\n")
+	}
+}
+
+func (enc *Encoder) keyEqElement(key Key, val reflect.Value) {
+	if len(key) == 0 {
+		encPanic(errNoKey)
+	}
+	panicIfInvalidKey(key)
+	enc.wf("%s%s = ", enc.indentStr(key), key.maybeQuoted(len(key)-1))
+	enc.eElement(val)
+	enc.newline()
+}
+
+func (enc *Encoder) wf(format string, v ...interface{}) {
+	if _, err := fmt.Fprintf(enc.w, format, v...); err != nil {
+		encPanic(err)
+	}
+	enc.hasWritten = true
+}
+
+func (enc *Encoder) indentStr(key Key) string {
+	return strings.Repeat(enc.Indent, len(key)-1)
+}
+
+func encPanic(err error) {
+	panic(tomlEncodeError{err})
+}
+
+func eindirect(v reflect.Value) reflect.Value {
+	switch v.Kind() {
+	case reflect.Ptr, reflect.Interface:
+		return eindirect(v.Elem())
+	default:
+		return v
+	}
+}
+
+func isNil(rv reflect.Value) bool {
+	switch rv.Kind() {
+	case reflect.Interface, reflect.Map, reflect.Ptr, reflect.Slice:
+		return rv.IsNil()
+	default:
+		return false
+	}
+}
+
+func panicIfInvalidKey(key Key) {
+	for _, k := range key {
+		if len(k) == 0 {
+			encPanic(e("Key '%s' is not a valid table name. Key names "+
+				"cannot be empty.", key.maybeQuotedAll()))
+		}
+	}
+}
+
+func isValidKeyName(s string) bool {
+	return len(s) != 0
+}

epm/vendor/github.com/BurntSushi/toml/encoding_types.go

+// +build go1.2
+
+package toml
+
+// In order to support Go 1.1, we define our own TextMarshaler and
+// TextUnmarshaler types. For Go 1.2+, we just alias them with the
+// standard library interfaces.
+
+import (
+	"encoding"
+)
+
+// TextMarshaler is a synonym for encoding.TextMarshaler. It is defined here
+// so that Go 1.1 can be supported.
+type TextMarshaler encoding.TextMarshaler
+
+// TextUnmarshaler is a synonym for encoding.TextUnmarshaler. It is defined
+// here so that Go 1.1 can be supported.
+type TextUnmarshaler encoding.TextUnmarshaler

epm/vendor/github.com/BurntSushi/toml/encoding_types_1.1.go

+// +build !go1.2
+
+package toml
+
+// These interfaces were introduced in Go 1.2, so we add them manually when
+// compiling for Go 1.1.
+
+// TextMarshaler is a synonym for encoding.TextMarshaler. It is defined here
+// so that Go 1.1 can be supported.
+type TextMarshaler interface {
+	MarshalText() (text []byte, err error)
+}
+
+// TextUnmarshaler is a synonym for encoding.TextUnmarshaler. It is defined
+// here so that Go 1.1 can be supported.
+type TextUnmarshaler interface {
+	UnmarshalText(text []byte) error
+}

epm/vendor/github.com/BurntSushi/toml/parse.go

+package toml
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+	"unicode/utf8"
+)
+
+type parser struct {
+	mapping map[string]interface{}
+	types   map[string]tomlType
+	lx      *lexer
+
+	// A list of keys in the order that they appear in the TOML data.
+	ordered []Key
+
+	// the full key for the current hash in scope
+	context Key
+
+	// the base key name for everything except hashes
+	currentKey string
+
+	// rough approximation of line number
+	approxLine int
+
+	// A map of 'key.group.names' to whether they were created implicitly.
+	implicits map[string]bool
+}
+
+type parseError string
+
+func (pe parseError) Error() string {
+	return string(pe)
+}
+
+func parse(data string) (p *parser, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			var ok bool
+			if err, ok = r.(parseError); ok {
+				return
+			}
+			panic(r)
+		}
+	}()
+
+	p = &parser{
+		mapping:   make(map[string]interface{}),
+		types:     make(map[string]tomlType),
+		lx:        lex(data),
+		ordered:   make([]Key, 0),
+		implicits: make(map[string]bool),
+	}
+	for {
+		item := p.next()
+		if item.typ == itemEOF {
+			break
+		}
+		p.topLevel(item)
+	}
+
+	return p, nil
+}
+
+func (p *parser) panicf(format string, v ...interface{}) {
+	msg := fmt.Sprintf("Near line %d (last key parsed '%s'): %s",
+		p.approxLine, p.current(), fmt.Sprintf(format, v...))
+	panic(parseError(msg))
+}
+
+func (p *parser) next() item {
+	it := p.lx.nextItem()
+	if it.typ == itemError {
+		p.panicf("%s", it.val)
+	}
+	return it
+}
+
+func (p *parser) bug(format string, v ...interface{}) {
+	panic(fmt.Sprintf("BUG: "+format+"\n\n", v...))
+}
+
+func (p *parser) expect(typ itemType) item {
+	it := p.next()
+	p.assertEqual(typ, it.typ)
+	return it
+}
+
+func (p *parser) assertEqual(expected, got itemType) {
+	if expected != got {
+		p.bug("Expected '%s' but got '%s'.", expected, got)
+	}
+}
+
+func (p *parser) topLevel(item item) {
+	switch item.typ {
+	case itemCommentStart:
+		p.approxLine = item.line
+		p.expect(itemText)
+	case itemTableStart:
+		kg := p.next()
+		p.approxLine = kg.line
+
+		var key Key
+		for ; kg.typ != itemTableEnd && kg.typ != itemEOF; kg = p.next() {
+			key = append(key, p.keyString(kg))
+		}
+		p.assertEqual(itemTableEnd, kg.typ)
+
+		p.establishContext(key, false)
+		p.setType("", tomlHash)
+		p.ordered = append(p.ordered, key)
+	case itemArrayTableStart:
+		kg := p.next()
+		p.approxLine = kg.line
+
+		var key Key
+		for ; kg.typ != itemArrayTableEnd && kg.typ != itemEOF; kg = p.next() {
+			key = append(key, p.keyString(kg))
+		}
+		p.assertEqual(itemArrayTableEnd, kg.typ)
+
+		p.establishContext(key, true)
+		p.setType("", tomlArrayHash)
+		p.ordered = append(p.ordered, key)
+	case itemKeyStart:
+		kname := p.next()
+		p.approxLine = kname.line
+		p.currentKey = p.keyString(kname)
+
+		val, typ := p.value(p.next())
+		p.setValue(p.currentKey, val)
+		p.setType(p.currentKey, typ)
+		p.ordered = append(p.ordered, p.context.add(p.currentKey))
+		p.currentKey = ""
+	default:
+		p.bug("Unexpected type at top level: %s", item.typ)
+	}
+}
+
+// Gets a string for a key (or part of a key in a table name).
+func (p *parser) keyString(it item) string {
+	switch it.typ {
+	case itemText:
+		return it.val
+	case itemString, itemMultilineString,
+		itemRawString, itemRawMultilineString:
+		s, _ := p.value(it)
+		return s.(string)
+	default:
+		p.bug("Unexpected key type: %s", it.typ)
+		panic("unreachable")
+	}
+}
+
+// value translates an expected value from the lexer into a Go value wrapped
+// as an empty interface.
+func (p *parser) value(it item) (interface{}, tomlType) {
+	switch it.typ {
+	case itemString:
+		return p.replaceEscapes(it.val), p.typeOfPrimitive(it)
+	case itemMultilineString:
+		trimmed := stripFirstNewline(stripEscapedWhitespace(it.val))
+		return p.replaceEscapes(trimmed), p.typeOfPrimitive(it)
+	case itemRawString:
+		return it.val, p.typeOfPrimitive(it)
+	case itemRawMultilineString:
+		return stripFirstNewline(it.val), p.typeOfPrimitive(it)
+	case itemBool:
+		switch it.val {
+		case "true":
+			return true, p.typeOfPrimitive(it)
+		case "false":
+			return false, p.typeOfPrimitive(it)
+		}
+		p.bug("Expected boolean value, but got '%s'.", it.val)
+	case itemInteger:
+		if !numUnderscoresOK(it.val) {
+			p.panicf("Invalid integer %q: underscores must be surrounded by digits",
+				it.val)
+		}
+		val := strings.Replace(it.val, "_", "", -1)
+		num, err := strconv.ParseInt(val, 10, 64)
+		if err != nil {
+			// Distinguish integer values. Normally, it'd be a bug if the lexer
+			// provides an invalid integer, but it's possible that the number is
+			// out of range of valid values (which the lexer cannot determine).
+			// So mark the former as a bug but the latter as a legitimate user
+			// error.
+			if e, ok := err.(*strconv.NumError); ok &&
+				e.Err == strconv.ErrRange {
+
+				p.panicf("Integer '%s' is out of the range of 64-bit "+
+					"signed integers.", it.val)
+			} else {
+				p.bug("Expected integer value, but got '%s'.", it.val)
+			}
+		}
+		return num, p.typeOfPrimitive(it)
+	case itemFloat:
+		parts := strings.FieldsFunc(it.val, func(r rune) bool {
+			switch r {
+			case '.', 'e', 'E':
+				return true
+			}
+			return false
+		})
+		for _, part := range parts {
+			if !numUnderscoresOK(part) {
+				p.panicf("Invalid float %q: underscores must be "+
+					"surrounded by digits", it.val)
+			}
+		}
+		if !numPeriodsOK(it.val) {
+			// As a special case, numbers like '123.' or '1.e2',
+			// which are valid as far as Go/strconv are concerned,
+			// must be rejected because TOML says that a fractional
+			// part consists of '.' followed by 1+ digits.
+			p.panicf("Invalid float %q: '.' must be followed "+
+				"by one or more digits", it.val)
+		}
+		val := strings.Replace(it.val, "_", "", -1)
+		num, err := strconv.ParseFloat(val, 64)
+		if err != nil {
+			if e, ok := err.(*strconv.NumError); ok &&
+				e.Err == strconv.ErrRange {
+
+				p.panicf("Float '%s' is out of the range of 64-bit "+
+					"IEEE-754 floating-point numbers.", it.val)
+			} else {
+				p.panicf("Invalid float value: %q", it.val)
+			}
+		}
+		return num, p.typeOfPrimitive(it)
+	case itemDatetime:
+		var t time.Time
+		var ok bool
+		var err error
+		for _, format := range []string{
+			"2006-01-02T15:04:05Z07:00",
+			"2006-01-02T15:04:05",
+			"2006-01-02",
+		} {
+			t, err = time.ParseInLocation(format, it.val, time.Local)
+			if err == nil {
+				ok = true
+				break
+			}
+		}
+		if !ok {
+			p.panicf("Invalid TOML Datetime: %q.", it.val)
+		}
+		return t, p.typeOfPrimitive(it)
+	case itemArray:
+		array := make([]interface{}, 0)
+		types := make([]tomlType, 0)
+
+		for it = p.next(); it.typ != itemArrayEnd; it = p.next() {
+			if it.typ == itemCommentStart {
+				p.expect(itemText)
+				continue
+			}
+
+			val, typ := p.value(it)
+			array = append(array, val)
+			types = append(types, typ)
+		}
+		return array, p.typeOfArray(types)
+	case itemInlineTableStart:
+		var (
+			hash         = make(map[string]interface{})
+			outerContext = p.context
+			outerKey     = p.currentKey
+		)
+
+		p.context = append(p.context, p.currentKey)
+		p.currentKey = ""
+		for it := p.next(); it.typ != itemInlineTableEnd; it = p.next() {
+			if it.typ != itemKeyStart {
+				p.bug("Expected key start but instead found %q, around line %d",
+					it.val, p.approxLine)
+			}
+			if it.typ == itemCommentStart {
+				p.expect(itemText)
+				continue
+			}
+
+			// retrieve key
+			k := p.next()
+			p.approxLine = k.line
+			kname := p.keyString(k)
+
+			// retrieve value
+			p.currentKey = kname
+			val, typ := p.value(p.next())
+			// make sure we keep metadata up to date
+			p.setType(kname, typ)
+			p.ordered = append(p.ordered, p.context.add(p.currentKey))
+			hash[kname] = val
+		}
+		p.context = outerContext
+		p.currentKey = outerKey
+		return hash, tomlHash
+	}
+	p.bug("Unexpected value type: %s", it.typ)
+	panic("unreachable")
+}
+
+// numUnderscoresOK checks whether each underscore in s is surrounded by
+// characters that are not underscores.
+func numUnderscoresOK(s string) bool {
+	accept := false
+	for _, r := range s {
+		if r == '_' {
+			if !accept {
+				return false
+			}
+			accept = false
+			continue
+		}
+		accept = true
+	}
+	return accept
+}
+
+// numPeriodsOK checks whether every period in s is followed by a digit.
+func numPeriodsOK(s string) bool {
+	period := false
+	for _, r := range s {
+		if period && !isDigit(r) {
+			return false
+		}
+		period = r == '.'
+	}
+	return !period
+}
+
+// establishContext sets the current context of the parser,
+// where the context is either a hash or an array of hashes. Which one is
+// set depends on the value of the `array` parameter.
+//
+// Establishing the context also makes sure that the key isn't a duplicate, and
+// will create implicit hashes automatically.
+func (p *parser) establishContext(key Key, array bool) {
+	var ok bool
+
+	// Always start at the top level and drill down for our context.
+	hashContext := p.mapping
+	keyContext := make(Key, 0)
+
+	// We only need implicit hashes for key[0:-1]
+	for _, k := range key[0 : len(key)-1] {
+		_, ok = hashContext[k]
+		keyContext = append(keyContext, k)
+
+		// No key? Make an implicit hash and move on.
+		if !ok {
+			p.addImplicit(keyContext)
+			hashContext[k] = make(map[string]interface{})
+		}
+
+		// If the hash context is actually an array of tables, then set
+		// the hash context to the last element in that array.
+		//
+		// Otherwise, it better be a table, since this MUST be a key group (by
+		// virtue of it not being the last element in a key).
+		switch t := hashContext[k].(type) {
+		case []map[string]interface{}:
+			hashContext = t[len(t)-1]
+		case map[string]interface{}:
+			hashContext = t
+		default:
+			p.panicf("Key '%s' was already created as a hash.", keyContext)
+		}
+	}
+
+	p.context = keyContext
+	if array {
+		// If this is the first element for this array, then allocate a new
+		// list of tables for it.
+		k := key[len(key)-1]
+		if _, ok := hashContext[k]; !ok {
+			hashContext[k] = make([]map[string]interface{}, 0, 5)
+		}
+
+		// Add a new table. But make sure the key hasn't already been used
+		// for something else.
+		if hash, ok := hashContext[k].([]map[string]interface{}); ok {
+			hashContext[k] = append(hash, make(map[string]interface{}))
+		} else {
+			p.panicf("Key '%s' was already created and cannot be used as "+
+				"an array.", keyContext)
+		}
+	} else {
+		p.setValue(key[len(key)-1], make(map[string]interface{}))
+	}
+	p.context = append(p.context, key[len(key)-1])
+}
+
+// setValue sets the given key to the given value in the current context.
+// It will make sure that the key hasn't already been defined, account for
+// implicit key groups.
+func (p *parser) setValue(key string, value interface{}) {
+	var tmpHash interface{}
+	var ok bool
+
+	hash := p.mapping
+	keyContext := make(Key, 0)
+	for _, k := range p.context {
+		keyContext = append(keyContext, k)
+		if tmpHash, ok = hash[k]; !ok {
+			p.bug("Context for key '%s' has not been established.", keyContext)
+		}
+		switch t := tmpHash.(type) {
+		case []map[string]interface{}:
+			// The context is a table of hashes. Pick the most recent table
+			// defined as the current hash.
+			hash = t[len(t)-1]
+		case map[string]interface{}:
+			hash = t
+		default:
+			p.bug("Expected hash to have type 'map[string]interface{}', but "+
+				"it has '%T' instead.", tmpHash)
+		}
+	}
+	keyContext = append(keyContext, key)
+
+	if _, ok := hash[key]; ok {
+		// Typically, if the given key has already been set, then we have
+		// to raise an error since duplicate keys are disallowed. However,
+		// it's possible that a key was previously defined implicitly. In this
+		// case, it is allowed to be redefined concretely. (See the
+		// `tests/valid/implicit-and-explicit-after.toml` test in `toml-test`.)
+		//
+		// But we have to make sure to stop marking it as an implicit. (So that
+		// another redefinition provokes an error.)
+		//
+		// Note that since it has already been defined (as a hash), we don't
+		// want to overwrite it. So our business is done.
+		if p.isImplicit(keyContext) {
+			p.removeImplicit(keyContext)
+			return
+		}
+
+		// Otherwise, we have a concrete key trying to override a previous
+		// key, which is *always* wrong.
+		p.panicf("Key '%s' has already been defined.", keyContext)
+	}
+	hash[key] = value
+}
+
+// setType sets the type of a particular value at a given key.
+// It should be called immediately AFTER setValue.
+//
+// Note that if `key` is empty, then the type given will be applied to the
+// current context (which is either a table or an array of tables).
+func (p *parser) setType(key string, typ tomlType) {
+	keyContext := make(Key, 0, len(p.context)+1)
+	for _, k := range p.context {
+		keyContext = append(keyContext, k)
+	}
+	if len(key) > 0 { // allow type setting for hashes
+		keyContext = append(keyContext, key)
+	}
+	p.types[keyContext.String()] = typ
+}
+
+// addImplicit sets the given Key as having been created implicitly.
+func (p *parser) addImplicit(key Key) {
+	p.implicits[key.String()] = true
+}
+
+// removeImplicit stops tagging the given key as having been implicitly
+// created.
+func (p *parser) removeImplicit(key Key) {
+	p.implicits[key.String()] = false
+}
+
+// isImplicit returns true if the key group pointed to by the key was created
+// implicitly.
+func (p *parser) isImplicit(key Key) bool {
+	return p.implicits[key.String()]
+}
+
+// current returns the full key name of the current context.
+func (p *parser) current() string {
+	if len(p.currentKey) == 0 {
+		return p.context.String()
+	}
+	if len(p.context) == 0 {
+		return p.currentKey
+	}
+	return fmt.Sprintf("%s.%s", p.context, p.currentKey)
+}
+
+func stripFirstNewline(s string) string {
+	if len(s) == 0 || s[0] != '\n' {
+		return s
+	}
+	return s[1:]
+}
+
+func stripEscapedWhitespace(s string) string {
+	esc := strings.Split(s, "\\\n")
+	if len(esc) > 1 {
+		for i := 1; i < len(esc); i++ {
+			esc[i] = strings.TrimLeftFunc(esc[i], unicode.IsSpace)
+		}
+	}
+	return strings.Join(esc, "")
+}
+
+func (p *parser) replaceEscapes(str string) string {
+	var replaced []rune
+	s := []byte(str)
+	r := 0
+	for r < len(s) {
+		if s[r] != '\\' {
+			c, size := utf8.DecodeRune(s[r:])
+			r += size
+			replaced = append(replaced, c)
+			continue
+		}
+		r += 1
+		if r >= len(s) {
+			p.bug("Escape sequence at end of string.")
+			return ""
+		}
+		switch s[r] {
+		default:
+			p.bug("Expected valid escape code after \\, but got %q.", s[r])
+			return ""
+		case 'b':
+			replaced = append(replaced, rune(0x0008))
+			r += 1
+		case 't':
+			replaced = append(replaced, rune(0x0009))
+			r += 1
+		case 'n':
+			replaced = append(replaced, rune(0x000A))
+			r += 1
+		case 'f':
+			replaced = append(replaced, rune(0x000C))
+			r += 1
+		case 'r':
+			replaced = append(replaced, rune(0x000D))
+			r += 1
+		case '"':
+			replaced = append(replaced, rune(0x0022))
+			r += 1
+		case '\\':
+			replaced = append(replaced, rune(0x005C))
+			r += 1
+		case 'u':
+			// At this point, we know we have a Unicode escape of the form
+			// `uXXXX` at [r, r+5). (Because the lexer guarantees this
+			// for us.)
+			escaped := p.asciiEscapeToUnicode(s[r+1 : r+5])
+			replaced = append(replaced, escaped)
+			r += 5
+		case 'U':
+			// At this point, we know we have a Unicode escape of the form
+			// `uXXXX` at [r, r+9). (Because the lexer guarantees this
+			// for us.)
+			escaped := p.asciiEscapeToUnicode(s[r+1 : r+9])
+			replaced = append(replaced, escaped)
+			r += 9
+		}
+	}
+	return string(replaced)
+}
+
+func (p *parser) asciiEscapeToUnicode(bs []byte) rune {
+	s := string(bs)
+	hex, err := strconv.ParseUint(strings.ToLower(s), 16, 32)
+	if err != nil {
+		p.bug("Could not parse '%s' as a hexadecimal number, but the "+
+			"lexer claims it's OK: %s", s, err)
+	}
+	if !utf8.ValidRune(rune(hex)) {
+		p.panicf("Escaped character '\\u%s' is not valid UTF-8.", s)
+	}
+	return rune(hex)
+}
+
+func isStringType(ty itemType) bool {
+	return ty == itemString || ty == itemMultilineString ||
+		ty == itemRawString || ty == itemRawMultilineString
+}

epm/vendor/github.com/BurntSushi/toml/session.vim

+au BufWritePost *.go silent!make tags > /dev/null 2>&1

epm/vendor/github.com/BurntSushi/toml/type_check.go

+package toml
+
+// tomlType represents any Go type that corresponds to a TOML type.
+// While the first draft of the TOML spec has a simplistic type system that
+// probably doesn't need this level of sophistication, we seem to be militating
+// toward adding real composite types.
+type tomlType interface {
+	typeString() string
+}
+
+// typeEqual accepts any two types and returns true if they are equal.
+func typeEqual(t1, t2 tomlType) bool {
+	if t1 == nil || t2 == nil {
+		return false
+	}
+	return t1.typeString() == t2.typeString()
+}
+
+func typeIsHash(t tomlType) bool {
+	return typeEqual(t, tomlHash) || typeEqual(t, tomlArrayHash)
+}
+
+type tomlBaseType string
+
+func (btype tomlBaseType) typeString() string {
+	return string(btype)
+}
+
+func (btype tomlBaseType) String() string {
+	return btype.typeString()
+}
+
+var (
+	tomlInteger   tomlBaseType = "Integer"
+	tomlFloat     tomlBaseType = "Float"
+	tomlDatetime  tomlBaseType = "Datetime"
+	tomlString    tomlBaseType = "String"
+	tomlBool      tomlBaseType = "Bool"
+	tomlArray     tomlBaseType = "Array"
+	tomlHash      tomlBaseType = "Hash"
+	tomlArrayHash tomlBaseType = "ArrayHash"
+)
+
+// typeOfPrimitive returns a tomlType of any primitive value in TOML.
+// Primitive values are: Integer, Float, Datetime, String and Bool.
+//
+// Passing a lexer item other than the following will cause a BUG message
+// to occur: itemString, itemBool, itemInteger, itemFloat, itemDatetime.
+func (p *parser) typeOfPrimitive(lexItem item) tomlType {
+	switch lexItem.typ {
+	case itemInteger:
+		return tomlInteger
+	case itemFloat:
+		return tomlFloat
+	case itemDatetime:
+		return tomlDatetime
+	case itemString:
+		return tomlString
+	case itemMultilineString:
+		return tomlString
+	case itemRawString:
+		return tomlString
+	case itemRawMultilineString:
+		return tomlString
+	case itemBool:
+		return tomlBool
+	}
+	p.bug("Cannot infer primitive type of lex item '%s'.", lexItem)
+	panic("unreachable")
+}
+
+// typeOfArray returns a tomlType for an array given a list of types of its
+// values.
+//
+// In the current spec, if an array is homogeneous, then its type is always
+// "Array". If the array is not homogeneous, an error is generated.
+func (p *parser) typeOfArray(types []tomlType) tomlType {
+	// Empty arrays are cool.
+	if len(types) == 0 {
+		return tomlArray
+	}
+
+	theType := types[0]
+	for _, t := range types[1:] {
+		if !typeEqual(theType, t) {
+			p.panicf("Array contains values of type '%s' and '%s', but "+
+				"arrays must be homogeneous.", theType, t)
+		}
+	}
+	return tomlArray
+}

epm/vendor/github.com/beorn7/perks/LICENSE

+Copyright (C) 2013 Blake Mizerany
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

epm/vendor/github.com/boltdb/bolt/.gitignore

+*.prof
+*.test
+*.swp
+/bin/

epm/vendor/github.com/boltdb/bolt/LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2013 Ben Johnson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

epm/vendor/github.com/boltdb/bolt/Makefile

+BRANCH=`git rev-parse --abbrev-ref HEAD`
+COMMIT=`git rev-parse --short HEAD`
+GOLDFLAGS="-X main.branch $(BRANCH) -X main.commit $(COMMIT)"
+
+default: build
+
+race:
+	@go test -v -race -test.run="TestSimulate_(100op|1000op)"
+
+# go get github.com/kisielk/errcheck
+errcheck:
+	@errcheck -ignorepkg=bytes -ignore=os:Remove github.com/boltdb/bolt
+
+test: 
+	@go test -v -cover .
+	@go test -v ./cmd/bolt
+
+.PHONY: fmt test

epm/vendor/github.com/boltdb/bolt/appveyor.yml

+version: "{build}"
+
+os: Windows Server 2012 R2
+
+clone_folder: c:\gopath\src\github.com\boltdb\bolt
+
+environment:
+  GOPATH: c:\gopath
+
+install:
+  - echo %PATH%
+  - echo %GOPATH%
+  - go version
+  - go env
+  - go get -v -t ./...
+
+build_script:
+  - go test -v ./...

epm/vendor/github.com/boltdb/bolt/bolt_386.go

+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x7FFFFFFF // 2GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

epm/vendor/github.com/boltdb/bolt/bolt_amd64.go

+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

epm/vendor/github.com/boltdb/bolt/bolt_arm.go

+package bolt
+
+import "unsafe"
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x7FFFFFFF // 2GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned bool
+
+func init() {
+	// Simple check to see whether this arch handles unaligned load/stores
+	// correctly.
+
+	// ARM9 and older devices require load/stores to be from/to aligned
+	// addresses. If not, the lower 2 bits are cleared and that address is
+	// read in a jumbled up order.
+
+	// See http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15414.html
+
+	raw := [6]byte{0xfe, 0xef, 0x11, 0x22, 0x22, 0x11}
+	val := *(*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(&raw)) + 2))
+
+	brokenUnaligned = val != 0x11222211
+}

epm/vendor/github.com/boltdb/bolt/bolt_arm64.go

+// +build arm64
+
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF
+
+// Are unaligned load/stores broken on this arch?
+var brokenUnaligned = false

epm/vendor/github.com/golang/protobuf/AUTHORS

+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at http://tip.golang.org/AUTHORS.

epm/vendor/github.com/golang/protobuf/CONTRIBUTORS

+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at http://tip.golang.org/CONTRIBUTORS.