Merge pull request #2 from hashicorp/f-initial-skeleton

Initial task driver skeleton implementation

.gitignore

@@ -0,0 +1 @@
+nomad-skeleton-driver-plugin

Makefile

@@ -1,55 +0,0 @@
-NAME := nomad-driver-skeleton
-PKG := github.com/hashicorp/$(NAME)
-
-CGO_ENABLED := 0
-
-# Set any default go build tags.
-BUILDTAGS :=
-# Set an output prefix, which is the local directory if not specified
-PREFIX?=$(shell pwd)
-
-GOOSARCHES=linux/amd64
-
-GO=go
-
-.PHONY: build
-build: $(NAME) ## Builds a dynamic executable or package.
-
-$(NAME): $(wildcard *.go) $(wildcard */*.go)
-	@echo "+ $@"
-	$(V)GO111MODULE=on GOOS=linux $(GO) build -tags "$(BUILDTAGS)" ${GO_LDFLAGS} -o $(NAME) ./cmd/driver/main.go
-
-.PHONY: static
-static: ## Builds a static executable.
-	@echo "+ $@"
-	CGO_ENABLED=$(CGO_ENABLED) $(GO) build \
-				-tags "$(BUILDTAGS) static_build" \
-				${GO_LDFLAGS_STATIC} -o $(NAME) .
-
-all: clean build fmt lint test vet
-
-.PHONY: fmt
-fmt: ## Verifies all files have been `gofmt`ed.
-	@echo "+ $@"
-	@gofmt -s -l . | grep -v '.pb.go:' | grep -v vendor | tee /dev/stderr
-
-.PHONY: test
-test: ## Runs the go tests.
-	@echo "+ $@"
-	@$(GO) test -v -tags "$(BUILDTAGS) cgo" $(shell $(GO) list ./... | grep -v vendor)
-
-.PHONY: vet
-vet: ## Verifies `go vet` passes.
-	@echo "+ $@"
-	@$(GO) vet -printfuncs Error,ErrorDepth,Errorf,Errorln,Exit,ExitDepth,Exitf,Exitln,Fatal,FatalDepth,Fatalf,Fatalln,Info,InfoDepth,Infof,Infoln,Warning,WarningDepth,Warningf,Warningln -all ./...
-
-.PHONY: clean
-clean: ## Cleanup any build binaries or packages.
-	@echo "+ $@"
-	$(RM) $(NAME)
-	$(RM) -r $(BUILDDIR)
-
-dep:
-	$(V)GO111MODULE=on go mod download
-	$(V)GO111MODULE=on go mod vendor
-	$(V)GO111MODULE=on go mod tidy

README.md

@@ -1,50 +1,49 @@
-# nomad-driver-skeleton
+nomad-skeleton-driver-plugin
-This project is a [Hashicorp Nomad](https://www.nomadproject.io/) runtime driver plugin skeleton implementation.
+==========
-You can clone and modify this to get started writing your
-own driver plugin.
 
-Note that this is only a skeleton to help you get started. The Makefile only builds
+This project is a [Hashicorp Nomad](https://www.nomadproject.io/) [task driver
-for linux/amd64
+plugin](https://www.nomadproject.io/docs/drivers/index.html) skeleton
+implementation. You can clone and modify this to get started writing your own
+task driver plugin.
 
 Requirements
-------------
+-------------------
 
 - [Nomad](https://www.nomadproject.io/downloads.html) v0.9.5+
-- [Go](https://golang.org/doc/install) v1.11+ (to build the plugin)
+- [Go](https://golang.org/doc/install) v1.12.x (to build the plugin)
 
 Get Started
------------
+-------------------
 
-Clone repository to: `$GOPATH/src/github.com/hashicorp/nomad-driver-skeleton
+Download the project module:
-
-Copy the files into your new driver's package and change package names as needed.
 
 ```sh
-$ cd $GOPATH/src/github.com/hashicorp/nomad-driver-skeleton
+go get github.com/hashicorp/nomad-skeleton-task-driver-plugin
-$ make dep
-$ make build
 ```
 
-Requirements
+Follow the comments marked with a `TODO` tag to implement your driver's logic.
-------------
+For more information consult the Nomad documentation on
+[plugins](https://www.nomadproject.io/docs/internals/plugins/index.html).
 
-[Go](http://www.golang.org) should be installed on your machine.
+The initial state of the skeleton is a simple task that outputs a greeting. You
-You will also need to correctly setup a [GOPATH](http://golang.org/doc/code.html#GOPATH)
+can try it out by starting a Nomad server and client and running the job
-and add `$GOPATH/bin` to your `$PATH`.
+provided in the `config` folder:
-
-To compile the driver plugin, run `make build`. This will build the plugin and put the task driver binary under the
-NOMAD plugin dir, which by default is located under `<nomad-data-dir>/plugins/`.
-Check Nomad `-data-dir` and `-plugin-dir` flags for more information.
 
 ```sh
-$ make build
+go build
+nomad agent -dev -config=./config/client.hcl -plugin-dir=$(PWD)
+
+# in another shell
+nomad run ./config/example.nomad
 ```
 
-Makefile and project module structure were inspired by [Sylab's singularity]() driver.
+You should rename the project's root folder and the `hello` module to fit your
+own driver.
 
 Code Organization
------------------
+-------------------
-The skeleton driver comes with an in memory task state store (see state.go).
+The skeleton driver comes with an in memory task state store (see
-This in-memory map is for storing runtime details (like a process id). The details
+`hello/state.go`). This in-memory map is for storing runtime details (like a
-of what to store is left to the implementation of the runtime driver.
+process id). The details of what to store is left to the implementation of the
-Fields stored in the base implementation in this skeleton can be found in the `taskHandle` struct.
+task driver. Fields stored in the base implementation in this skeleton can be
+found in the `taskHandle` struct.

config/client.hcl

@@ -0,0 +1,7 @@
+log_level = "TRACE"
+
+plugin "nomad-skeleton-driver-plugin" {
+  config {
+    shell = "bash"
+  }
+}

config/example.nomad

@@ -0,0 +1,14 @@
+job "example" {
+  datacenters = ["dc1"]
+  type        = "batch"
+
+  group "example" {
+    task "hello-world" {
+      driver = "hello-world-example"
+
+      config {
+        greeting = "hello"
+      }
+    }
+  }
+}

go.mod

@@ -1,49 +1,52 @@
-module github.com/hashicorp/nomad-driver-skeleton
+module github.com/hashicorp/nomad-skeleton-driver-plugin
+
+go 1.12
 
 require (
 	github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5 // indirect
-	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
+	github.com/NVIDIA/gpu-monitoring-tools v0.0.0-20191126014920-0d8df858cca4 // indirect
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/Sirupsen/logrus v0.0.0-00010101000000-000000000000 // indirect
-	github.com/go-ole/go-ole v1.2.2 // indirect
+	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
-	github.com/golang/snappy v0.0.1 // indirect
+	github.com/appc/spec v0.8.11 // indirect
-	github.com/gorhill/cronexpr v0.0.0-20140423231348-a557574d6c02 // indirect
+	github.com/containerd/go-cni v0.0.0-20191121212822-60d125212faf // indirect
-	github.com/hashicorp/consul v1.0.7 // indirect
+	github.com/containernetworking/plugins v0.8.3 // indirect
-	github.com/hashicorp/go-hclog v0.8.0
+	github.com/coreos/go-iptables v0.4.3 // indirect
-	github.com/hashicorp/go-plugin v0.0.0-20190212232519-b838ffee39ce // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
-	github.com/hashicorp/go-retryablehttp v0.5.3 // indirect
+	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
-	github.com/hashicorp/go-rootcerts v0.0.0-20160503143440-6bb64b370b90 // indirect
+	github.com/docker/cli v0.0.0-20191202230238-13fb276442f5 // indirect
-	github.com/hashicorp/go-uuid v1.0.1 // indirect
+	github.com/docker/docker v1.13.1 // indirect
-	github.com/hashicorp/go-version v1.0.0 // indirect
+	github.com/docker/docker-credential-helpers v0.6.3 // indirect
-	github.com/hashicorp/hcl v0.0.0-20161101180025-6e968a3fcdcb // indirect
+	github.com/docker/go-metrics v0.0.1 // indirect
-	github.com/hashicorp/memberlist v0.1.3 // indirect
+	github.com/docker/libtrust v0.0.0-20160708172513-aabc10ec26b7 // indirect
-	github.com/hashicorp/nomad v0.9.0-rc2
+	github.com/fsouza/go-dockerclient v1.6.0 // indirect
-	github.com/hashicorp/raft v0.0.0-20190104133720-9c733b2b7f53 // indirect
+	github.com/hashicorp/consul v1.6.2 // indirect
-	github.com/hashicorp/serf v0.0.0-20180119224300-b6017ae61f44 // indirect
+	github.com/hashicorp/consul-template v0.23.0
-	github.com/hashicorp/vault v1.1.0 // indirect
+	github.com/hashicorp/go-envparse v0.0.0-20190703193109-150b3a2a4611 // indirect
-	github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d // indirect
+	github.com/hashicorp/go-getter v1.4.0 // indirect
-	github.com/hpcloud/tail v0.0.0-20180514194441-a1dbeea552b7 // indirect
+	github.com/hashicorp/go-hclog v0.10.0
-	github.com/kr/pretty v0.1.0 // indirect
+	github.com/hashicorp/go-plugin v1.0.1
-	github.com/mitchellh/copystructure v0.0.0-20170525013902-d23ffcb85de3 // indirect
+	github.com/hashicorp/hcl2 v0.0.0-20191002203319-fb75b3253c80 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/hashicorp/nomad v0.10.1
-	github.com/mitchellh/go-testing-interface v1.0.0 // indirect
+	github.com/hashicorp/nomad/api v0.0.0-20191203164002-b31573ae7206 // indirect
-	github.com/mitchellh/hashstructure v0.0.0-20160118175604-1ef5c71b025a // indirect
+	github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b // indirect
-	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/moby/moby v1.13.1 // indirect
-	github.com/mitchellh/reflectwalk v1.0.0 // indirect
+	github.com/seccomp/libseccomp-golang v0.9.1 // indirect
-	github.com/pascaldekloe/goe v0.1.0 // indirect
+	github.com/shirou/gopsutil v2.19.11+incompatible // indirect
-	github.com/pierrec/lz4 v2.0.5+incompatible // indirect
+	github.com/syndtr/gocapability v0.0.0-20180916011248-d98352740cb2 // indirect
-	github.com/pkg/errors v0.8.1 // indirect
+	github.com/ugorji/go v1.1.7 // indirect
-	github.com/ryanuber/go-glob v0.0.0-20170128012129-256dc444b735 // indirect
+	github.com/vbatts/tar-split v0.11.1 // indirect
-	github.com/shirou/gopsutil v0.0.0-20190131151121-071446942108 // indirect
+	github.com/zclconf/go-cty v1.1.1 // indirect
-	github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
+	go4.org v0.0.0-20191010144846-132d2879e1e9 // indirect
-	github.com/ugorji/go v0.0.0-20170620060102-0053ebfd9d0e // indirect
-	github.com/vmihailenco/msgpack v4.0.2+incompatible // indirect
-	github.com/zclconf/go-cty v0.0.0-20180718220526-02bd58e97b57 // indirect
-	golang.org/x/sys v0.0.0-20190220154126-629670e5acc5 // indirect
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	google.golang.org/appengine v1.4.0 // indirect
-	google.golang.org/genproto v0.0.0-20190219182410-082222b4a5c5 // indirect
-	google.golang.org/grpc v1.18.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/fsnotify/fsnotify.v1 v1.4.7 // indirect
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 )
+
+// use lower-case sirupsen
+replace github.com/Sirupsen/logrus => github.com/sirupsen/logrus v1.4.2
+
+// don't use shirou/gopsutil, use the hashicorp fork
+replace github.com/shirou/gopsutil => github.com/hashicorp/gopsutil v0.0.0-20180427102116-62d5761ddb7d
+
+// don't use ugorji/go, use the hashicorp fork
+replace github.com/ugorji/go => github.com/hashicorp/go-msgpack v0.0.0-20190927083313-23165f7bc3c2
+
+// fix the version of hashicorp/go-msgpack to 96ddbed8d05b
+replace github.com/hashicorp/go-msgpack => github.com/hashicorp/go-msgpack v0.0.0-20191101193846-96ddbed8d05b

go.sum

@@ -1,165 +1,686 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1 h1:lRi0CHyU+ytlvylOlFKKq0af6JncuyoRh1J+QJBqQx0=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+github.com/Azure/azure-sdk-for-go v16.0.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
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+github.com/Azure/go-autorest v10.7.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/Azure/go-autorest v10.15.3+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/DataDog/datadog-go v2.2.0+incompatible h1:V5BKkxACZLjzHjSgBbr2gvLA2Ae49yhc6CSY7MLy5k4=
+github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5 h1:U7q69tqXiCf6m097GRlNQB0/6SI1qWIOHYHhCEvDxF4=
 github.com/LK4D4/joincontext v0.0.0-20171026170139-1724345da6d5/go.mod h1:nxQPcNPR/34g+HcK2hEsF99O+GJgIkW/OmPl8wtzhmk=
-github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 h1:fLjPD/aNc3UIOA6tDi6QXUemppXK3P9BI7mr2hd6gx8=
+github.com/Microsoft/go-winio v0.4.3/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
+github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5 h1:ygIc8M6trr62pF5DucadTWGdEB4mEyvzi0e2nbcmcyA=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
+github.com/Microsoft/hcsshim v0.8.6/go.mod h1:Op3hHsoHPAvb6lceZHDtd9OkTew38wNoXnJs8iY7rUg=
+github.com/Microsoft/hcsshim v0.8.7-0.20191101173118-65519b62243c/go.mod h1:7xhjOwRV2+0HXGmM0jxaEu+ZiXJFoVZOTfL/dmqbrD8=
+github.com/NVIDIA/gpu-monitoring-tools v0.0.0-20191126014920-0d8df858cca4 h1:lQOIV+oCx/V1R4471bD0GSsXiImXZihVwgOvukAax9g=
+github.com/NVIDIA/gpu-monitoring-tools v0.0.0-20191126014920-0d8df858cca4/go.mod h1:nMOvShGpWaf0bXwXmeu4k+O4uziuaEI8pWzIj3BUrOA=
+github.com/NYTimes/gziphandler v1.0.1/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
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+github.com/appc/spec v0.8.11 h1:BFwMCTHSDwanDlAA3ONbsLllTw4pCW85kVm290dNrV4=
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 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
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+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
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hello/driver.go

@@ -0,0 +1,640 @@
+package hello
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"time"
+
+	"github.com/hashicorp/consul-template/signals"
+	"github.com/hashicorp/go-hclog"
+	log "github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/nomad/drivers/shared/eventer"
+	"github.com/hashicorp/nomad/drivers/shared/executor"
+	"github.com/hashicorp/nomad/plugins/base"
+	"github.com/hashicorp/nomad/plugins/drivers"
+	"github.com/hashicorp/nomad/plugins/shared/hclspec"
+	"github.com/hashicorp/nomad/plugins/shared/structs"
+)
+
+const (
+	// pluginName is the name of the plugin
+	// this is used for logging and (along with the version) for uniquely
+	// identifying plugin binaries fingerprinted by the client
+	pluginName = "hello-world-example"
+
+	// pluginVersion allows the client to identify and use newer versions of
+	// an installed plugin
+	pluginVersion = "v0.1.0"
+
+	// fingerprintPeriod is the interval at which the plugin will send
+	// fingerprint responses
+	fingerprintPeriod = 30 * time.Second
+
+	// taskHandleVersion is the version of task handle which this plugin sets
+	// and understands how to decode
+	// this is used to allow modification and migration of the task schema
+	// used by the plugin
+	taskHandleVersion = 1
+)
+
+var (
+	// pluginInfo describes the plugin
+	pluginInfo = &base.PluginInfoResponse{
+		Type:              base.PluginTypeDriver,
+		PluginApiVersions: []string{drivers.ApiVersion010},
+		PluginVersion:     pluginVersion,
+		Name:              pluginName,
+	}
+
+	// configSpec is the specification of the plugin's configuration
+	// this is used to validate the configuration specified for the plugin
+	// on the client.
+	// this is not global, but can be specified on a per-client basis.
+	configSpec = hclspec.NewObject(map[string]*hclspec.Spec{
+		// TODO: define plugin's agent configuration schema.
+		//
+		// The schema should be defined using HCL specs and it will be used to
+		// validate the agent configuration provided by the user in the
+		// `plugin` stanza (https://www.nomadproject.io/docs/configuration/plugin.html).
+		//
+		// For example, for the schema below a valid configuration would be:
+		//
+		//   plugin "hello-driver-plugin" {
+		//     config {
+		//       shell = "fish"
+		//     }
+		//   }
+		"shell": hclspec.NewDefault(
+			hclspec.NewAttr("shell", "string", false),
+			hclspec.NewLiteral(`"bash"`),
+		),
+	})
+
+	// taskConfigSpec is the specification of the plugin's configuration for
+	// a task
+	// this is used to validated the configuration specified for the plugin
+	// when a job is submitted.
+	taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
+		// TODO: define plugin's task configuration schema
+		//
+		// The schema should be defined using HCL specs and it will be used to
+		// validate the task configuration provided by the user when they
+		// submit a job.
+		//
+		// For example, for the schema below a valid task would be:
+		//   job "example" {
+		//     group "example" {
+		//       task "say-hi" {
+		//         driver = "hello-driver-plugin"
+		//         config {
+		//           greeting = "Hi"
+		//         }
+		//       }
+		//     }
+		//   }
+		"greeting": hclspec.NewDefault(
+			hclspec.NewAttr("greeting", "string", false),
+			hclspec.NewLiteral(`"Hello, World!"`),
+		),
+	})
+
+	// capabilities indicates what optional features this driver supports
+	// this should be set according to the target run time.
+	capabilities = &drivers.Capabilities{
+		// TODO: set plugin's capabilities
+		//
+		// The plugin's capabilities signal Nomad which extra functionalities
+		// are supported. For a list of available options check the docs page:
+		// https://godoc.org/github.com/hashicorp/nomad/plugins/drivers#Capabilities
+		SendSignals: true,
+		Exec:        false,
+	}
+)
+
+// Config contains configuration information for the plugin
+type Config struct {
+	// TODO: create decoded plugin configuration struct
+	//
+	// This struct is the decoded version of the schema defined in the
+	// configSpec variable above. It's used to convert the HCL configuration
+	// passed by the Nomad agent into Go contructs.
+	Shell string `codec:"shell"`
+}
+
+// TaskConfig contains configuration information for a task that runs with
+// this plugin
+type TaskConfig struct {
+	// TODO: create decoded plugin task configuration struct
+	//
+	// This struct is the decoded version of the schema defined in the
+	// taskConfigSpec variable above. It's used to convert the string
+	// configuration for the task into Go contructs.
+	Greeting string `codec:"greeting"`
+}
+
+// TaskState is the runtime state which is encoded in the handle returned to
+// Nomad client.
+// This information is needed to rebuild the task state and handler during
+// recovery.
+type TaskState struct {
+	ReattachConfig *structs.ReattachConfig
+	TaskConfig     *drivers.TaskConfig
+	StartedAt      time.Time
+
+	// TODO: add any extra important values that must be persisted in order
+	// to restore a task.
+	//
+	// The plugin keeps track of its running tasks in a in-memory data
+	// structure. If the plugin crashes, this data will be lost, so Nomad
+	// will respawn a new instance of the plugin and try to restore its
+	// in-memory representation of the running tasks using the RecoverTask()
+	// method below.
+	Pid int
+}
+
+// HelloDriverPlugin is an example driver plugin. When provisioned in a job,
+// the taks will output a greet specified by the user.
+type HelloDriverPlugin struct {
+	// eventer is used to handle multiplexing of TaskEvents calls such that an
+	// event can be broadcast to all callers
+	eventer *eventer.Eventer
+
+	// config is the plugin configuration set by the SetConfig RPC
+	config *Config
+
+	// nomadConfig is the client config from Nomad
+	nomadConfig *base.ClientDriverConfig
+
+	// tasks is the in memory datastore mapping taskIDs to driver handles
+	tasks *taskStore
+
+	// ctx is the context for the driver. It is passed to other subsystems to
+	// coordinate shutdown
+	ctx context.Context
+
+	// signalShutdown is called when the driver is shutting down and cancels
+	// the ctx passed to any subsystems
+	signalShutdown context.CancelFunc
+
+	// logger will log to the Nomad agent
+	logger log.Logger
+}
+
+// NewPlugin returns a new example driver plugin
+func NewPlugin(logger log.Logger) drivers.DriverPlugin {
+	ctx, cancel := context.WithCancel(context.Background())
+	logger = logger.Named(pluginName)
+
+	return &HelloDriverPlugin{
+		eventer:        eventer.NewEventer(ctx, logger),
+		config:         &Config{},
+		tasks:          newTaskStore(),
+		ctx:            ctx,
+		signalShutdown: cancel,
+		logger:         logger,
+	}
+}
+
+// PluginInfo returns information describing the plugin.
+func (d *HelloDriverPlugin) PluginInfo() (*base.PluginInfoResponse, error) {
+	return pluginInfo, nil
+}
+
+// ConfigSchema returns the plugin configuration schema.
+func (d *HelloDriverPlugin) ConfigSchema() (*hclspec.Spec, error) {
+	return configSpec, nil
+}
+
+// SetConfig is called by the client to pass the configuration for the plugin.
+func (d *HelloDriverPlugin) SetConfig(cfg *base.Config) error {
+	var config Config
+	if len(cfg.PluginConfig) != 0 {
+		if err := base.MsgPackDecode(cfg.PluginConfig, &config); err != nil {
+			return err
+		}
+	}
+
+	// Save the configuration to the plugin
+	d.config = &config
+
+	// TODO: parse and validated any configuration value if necessary.
+	//
+	// If your driver agent configuration requires any complex validation
+	// (some dependency between attributes) or special data parsing (the
+	// string "10s" into a time.Interval) you can do it here and update the
+	// value in d.config.
+	//
+	// In the example below we check if the shell specified by the user is
+	// supported by the plugin.
+	shell := d.config.Shell
+	if shell != "bash" && shell != "fish" {
+		return fmt.Errorf("invalid shell %s", d.config.Shell)
+	}
+
+	// Save the Nomad agent configuration
+	if cfg.AgentConfig != nil {
+		d.nomadConfig = cfg.AgentConfig.Driver
+	}
+
+	// TODO: initialize any extra requirements if necessary.
+	//
+	// Here you can use the config values to initialize any resources that are
+	// shared by all tasks that use this driver, such as a daemon process.
+
+	return nil
+}
+
+// TaskConfigSchema returns the HCL schema for the configuration of a task.
+func (d *HelloDriverPlugin) TaskConfigSchema() (*hclspec.Spec, error) {
+	return taskConfigSpec, nil
+}
+
+// Capabilities returns the features supported by the driver.
+func (d *HelloDriverPlugin) Capabilities() (*drivers.Capabilities, error) {
+	return capabilities, nil
+}
+
+// Fingerprint returns a channel that will be used to send health information
+// and other driver specific node attributes.
+func (d *HelloDriverPlugin) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
+	ch := make(chan *drivers.Fingerprint)
+	go d.handleFingerprint(ctx, ch)
+	return ch, nil
+}
+
+// handleFingerprint manages the channel and the flow of fingerprint data.
+func (d *HelloDriverPlugin) handleFingerprint(ctx context.Context, ch chan<- *drivers.Fingerprint) {
+	defer close(ch)
+
+	// Nomad expects the initial fingerprint to be sent immediately
+	ticker := time.NewTimer(0)
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-d.ctx.Done():
+			return
+		case <-ticker.C:
+			// after the initial fingerprint we can set the proper fingerprint
+			// period
+			ticker.Reset(fingerprintPeriod)
+			ch <- d.buildFingerprint()
+		}
+	}
+}
+
+// buildFingerprint returns the driver's fingerprint data
+func (d *HelloDriverPlugin) buildFingerprint() *drivers.Fingerprint {
+	fp := &drivers.Fingerprint{
+		Attributes:        map[string]*structs.Attribute{},
+		Health:            drivers.HealthStateHealthy,
+		HealthDescription: drivers.DriverHealthy,
+	}
+
+	// TODO: implement fingerprinting logic to populate health and driver
+	// attributes.
+	//
+	// Fingerprinting is used by the plugin to relay two important information
+	// to Nomad: health state and node attributes.
+	//
+	// If the plugin reports to be unhealthy, or doesn't send any fingerprint
+	// data in the expected interval of time, Nomad will restart it.
+	//
+	// Node attributes can be used to report any relevant information about
+	// the node in which the plugin is running (specific library availability,
+	// installed versions of a software etc.). These attributes can then be
+	// used by an operator to set job constrains.
+	//
+	// In the example below we check if the shell specified by the user exists
+	// in the node.
+	shell := d.config.Shell
+
+	cmd := exec.Command("which", shell)
+	if err := cmd.Run(); err != nil {
+		return &drivers.Fingerprint{
+			Health:            drivers.HealthStateUndetected,
+			HealthDescription: fmt.Sprintf("shell %s not found", shell),
+		}
+	}
+
+	// We also set the shell and its version as attributes
+	cmd = exec.Command(shell, "--version")
+	if out, err := cmd.Output(); err != nil {
+		d.logger.Warn("failed to find shell version: %v", err)
+	} else {
+		re := regexp.MustCompile("[0-9]\\.[0-9]\\.[0-9]")
+		version := re.FindString(string(out))
+
+		fp.Attributes["driver.hello.shell_version"] = structs.NewStringAttribute(version)
+		fp.Attributes["driver.hello.shell"] = structs.NewStringAttribute(shell)
+	}
+
+	return fp
+}
+
+// StartTask returns a task handle and a driver network if necessary.
+func (d *HelloDriverPlugin) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
+	if _, ok := d.tasks.Get(cfg.ID); ok {
+		return nil, nil, fmt.Errorf("task with ID %q already started", cfg.ID)
+	}
+
+	var driverConfig TaskConfig
+	if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
+		return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
+	}
+
+	d.logger.Info("starting task", "driver_cfg", hclog.Fmt("%+v", driverConfig))
+	handle := drivers.NewTaskHandle(taskHandleVersion)
+	handle.Config = cfg
+
+	// TODO: implement driver specific mechanism to start the task.
+	//
+	// Once the task is started you will need to store any relevant runtime
+	// information in a taskHandle and TaskState. The taskHandle will be
+	// stored in-memory in the plugin and will be used to interact with the
+	// task.
+	//
+	// The TaskState will be returned to the Nomad client inside a
+	// drivers.TaskHandle instance. This TaskHandle will be sent back to plugin
+	// if the task ever needs to be recovered, so the TaskState should contain
+	// enough information to handle that.
+	//
+	// In the example below we use an executor to fork a process to run our
+	// greeter. The executor is then stored in the handle so we can access it
+	// later and the the plugin.Client is used to generate a reattach
+	// configuration that can be used to recover communication with the task.
+	executorConfig := &executor.ExecutorConfig{
+		LogFile:  filepath.Join(cfg.TaskDir().Dir, "executor.out"),
+		LogLevel: "debug",
+	}
+
+	exec, pluginClient, err := executor.CreateExecutor(d.logger, d.nomadConfig, executorConfig)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to create executor: %v", err)
+	}
+
+	echoCmd := fmt.Sprintf(`echo "%s"`, driverConfig.Greeting)
+	execCmd := &executor.ExecCommand{
+		Cmd:        d.config.Shell,
+		Args:       []string{"-c", echoCmd},
+		StdoutPath: cfg.StdoutPath,
+		StderrPath: cfg.StderrPath,
+	}
+
+	ps, err := exec.Launch(execCmd)
+	if err != nil {
+		pluginClient.Kill()
+		return nil, nil, fmt.Errorf("failed to launch command with executor: %v", err)
+	}
+
+	h := &taskHandle{
+		exec:         exec,
+		pid:          ps.Pid,
+		pluginClient: pluginClient,
+		taskConfig:   cfg,
+		procState:    drivers.TaskStateRunning,
+		startedAt:    time.Now().Round(time.Millisecond),
+		logger:       d.logger,
+	}
+
+	driverState := TaskState{
+		ReattachConfig: structs.ReattachConfigFromGoPlugin(pluginClient.ReattachConfig()),
+		Pid:            ps.Pid,
+		TaskConfig:     cfg,
+		StartedAt:      h.startedAt,
+	}
+
+	if err := handle.SetDriverState(&driverState); err != nil {
+		return nil, nil, fmt.Errorf("failed to set driver state: %v", err)
+	}
+
+	d.tasks.Set(cfg.ID, h)
+	go h.run()
+	return handle, nil, nil
+}
+
+// RecoverTask recreates the in-memory state of a task from a TaskHandle.
+func (d *HelloDriverPlugin) RecoverTask(handle *drivers.TaskHandle) error {
+	if handle == nil {
+		return fmt.Errorf("error: handle cannot be nil")
+	}
+
+	if _, ok := d.tasks.Get(handle.Config.ID); ok {
+		return nil
+	}
+
+	var taskState TaskState
+	if err := handle.GetDriverState(&taskState); err != nil {
+		return fmt.Errorf("failed to decode task state from handle: %v", err)
+	}
+
+	var driverConfig TaskConfig
+	if err := taskState.TaskConfig.DecodeDriverConfig(&driverConfig); err != nil {
+		return fmt.Errorf("failed to decode driver config: %v", err)
+	}
+
+	// TODO: implement driver specific logic to recover a task.
+	//
+	// Recovering a task involves recreating and storing a taskHandle as if the
+	// task was just started.
+	//
+	// In the example below we use the executor to re-attach to the process
+	// that was created when the task first started.
+	plugRC, err := structs.ReattachConfigToGoPlugin(taskState.ReattachConfig)
+	if err != nil {
+		return fmt.Errorf("failed to build ReattachConfig from taskConfig state: %v", err)
+	}
+
+	execImpl, pluginClient, err := executor.ReattachToExecutor(plugRC, d.logger)
+	if err != nil {
+		return fmt.Errorf("failed to reattach to executor: %v", err)
+	}
+
+	h := &taskHandle{
+		exec:         execImpl,
+		pid:          taskState.Pid,
+		pluginClient: pluginClient,
+		taskConfig:   taskState.TaskConfig,
+		procState:    drivers.TaskStateRunning,
+		startedAt:    taskState.StartedAt,
+		exitResult:   &drivers.ExitResult{},
+	}
+
+	d.tasks.Set(taskState.TaskConfig.ID, h)
+
+	go h.run()
+	return nil
+}
+
+// WaitTask returns a channel used to notify Nomad when a task exits.
+func (d *HelloDriverPlugin) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return nil, drivers.ErrTaskNotFound
+	}
+
+	ch := make(chan *drivers.ExitResult)
+	go d.handleWait(ctx, handle, ch)
+	return ch, nil
+}
+
+func (d *HelloDriverPlugin) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
+	defer close(ch)
+	var result *drivers.ExitResult
+
+	// TODO: implement driver specific logic to notify Nomad the task has been
+	// completed and what was the exit result.
+	//
+	// When a result is sent in the result channel Nomad will stop the task and
+	// emit an event that an operator can use to get an insight on why the task
+	// stopped.
+	//
+	// In the example below we block and wait until the executor finishes
+	// running, at which point we send the exit code and signal in the result
+	// channel.
+	ps, err := handle.exec.Wait(ctx)
+	if err != nil {
+		result = &drivers.ExitResult{
+			Err: fmt.Errorf("executor: error waiting on process: %v", err),
+		}
+	} else {
+		result = &drivers.ExitResult{
+			ExitCode: ps.ExitCode,
+			Signal:   ps.Signal,
+		}
+	}
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-d.ctx.Done():
+			return
+		case ch <- result:
+		}
+	}
+}
+
+// StopTask stops a running task with the given signal and within the timeout window.
+func (d *HelloDriverPlugin) StopTask(taskID string, timeout time.Duration, signal string) error {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return drivers.ErrTaskNotFound
+	}
+
+	// TODO: implement driver specific logic to stop a task.
+	//
+	// The StopTask function is expected to stop a running task by sending the
+	// given signal to it. If the task does not stop during the given timeout,
+	// the driver must forcefully kill the task.
+	//
+	// In the example below we let the executor handle the task shutdown
+	// process for us, but you might need to customize this for your own
+	// implementation.
+	if err := handle.exec.Shutdown(signal, timeout); err != nil {
+		if handle.pluginClient.Exited() {
+			return nil
+		}
+		return fmt.Errorf("executor Shutdown failed: %v", err)
+	}
+
+	return nil
+}
+
+// DestroyTask cleans up and removes a task that has terminated.
+func (d *HelloDriverPlugin) DestroyTask(taskID string, force bool) error {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return drivers.ErrTaskNotFound
+	}
+
+	if handle.IsRunning() && !force {
+		return fmt.Errorf("cannot destroy running task")
+	}
+
+	// TODO: implement driver specific logic to destroy a complete task.
+	//
+	// Destroying a task includes removing any resources used by task and any
+	// local references in the plugin. If force is set to true the task should
+	// be destroyed even if it's currently running.
+	//
+	// In the example below we use the executor to force shutdown the task
+	// (timeout equals 0).
+	if !handle.pluginClient.Exited() {
+		if err := handle.exec.Shutdown("", 0); err != nil {
+			handle.logger.Error("destroying executor failed", "err", err)
+		}
+
+		handle.pluginClient.Kill()
+	}
+
+	d.tasks.Delete(taskID)
+	return nil
+}
+
+// InspectTask returns detailed status information for the referenced taskID.
+func (d *HelloDriverPlugin) InspectTask(taskID string) (*drivers.TaskStatus, error) {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return nil, drivers.ErrTaskNotFound
+	}
+
+	return handle.TaskStatus(), nil
+}
+
+// TaskStats returns a channel which the driver should send stats to at the given interval.
+func (d *HelloDriverPlugin) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return nil, drivers.ErrTaskNotFound
+	}
+
+	// TODO: implement driver specific logic to send task stats.
+	//
+	// This function returns a channel that Nomad will use to listen for task
+	// stats (e.g., CPU and memory usage) in a given interval. It should send
+	// stats until the context is canceled or the task stops running.
+	//
+	// In the example below we use the Stats function provided by the executor,
+	// but you can build a set of functions similar to the fingerprint process.
+	return handle.exec.Stats(ctx, interval)
+}
+
+// TaskEvents returns a channel that the plugin can use to emit task related events.
+func (d *HelloDriverPlugin) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
+	return d.eventer.TaskEvents(ctx)
+}
+
+// SignalTask forwards a signal to a task.
+// This is an optional capability.
+func (d *HelloDriverPlugin) SignalTask(taskID string, signal string) error {
+	handle, ok := d.tasks.Get(taskID)
+	if !ok {
+		return drivers.ErrTaskNotFound
+	}
+
+	// TODO: implement driver specific signal handling logic.
+	//
+	// The given signal must be forwarded to the target taskID. If this plugin
+	// doesn't support receiving signals (capability SendSignals is set to
+	// false) you can just return nil.
+	sig := os.Interrupt
+	if s, ok := signals.SignalLookup[signal]; ok {
+		sig = s
+	} else {
+		d.logger.Warn("unknown signal to send to task, using SIGINT instead", "signal", signal, "task_id", handle.taskConfig.ID)
+
+	}
+	return handle.exec.Signal(sig)
+}
+
+// ExecTask returns the result of executing the given command inside a task.
+// This is an optional capability.
+func (d *HelloDriverPlugin) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
+	// TODO: implement driver specific logic to execute commands in a task.
+	return nil, fmt.Errorf("This driver does not support exec")
+}

hello/handle.go

@@ -1,4 +1,4 @@
-package skeleton
+package hello
 
 import (
 	"context"
@@ -7,6 +7,8 @@ import (
 	"time"
 
 	"github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/go-plugin"
+	"github.com/hashicorp/nomad/drivers/shared/executor"
 	"github.com/hashicorp/nomad/plugins/drivers"
 )
 
@@ -14,17 +16,20 @@ import (
 // such as process ID if this is a local task or other meta
 // data if this driver deals with external APIs
 type taskHandle struct {
-	pid    int
-	logger hclog.Logger
-
 	// stateLock syncs access to all fields below
 	stateLock sync.RWMutex
 
+	logger       hclog.Logger
+	exec         executor.Executor
+	pluginClient *plugin.Client
 	taskConfig   *drivers.TaskConfig
 	procState    drivers.TaskState
 	startedAt    time.Time
 	completedAt  time.Time
 	exitResult   *drivers.ExitResult
+
+	// TODO: add any extra relevant information about the task.
+	pid int
 }
 
 func (h *taskHandle) TaskStatus() *drivers.TaskStatus {
@@ -57,23 +62,19 @@ func (h *taskHandle) run() {
 	}
 	h.stateLock.Unlock()
 
+	// TODO: wait for your task to complete and upate its state.
+	ps, err := h.exec.Wait(context.Background())
 	h.stateLock.Lock()
 	defer h.stateLock.Unlock()
 
-	// Implement running the task here, this is driver specific
+	if err != nil {
+		h.exitResult.Err = err
+		h.procState = drivers.TaskStateUnknown
+		h.completedAt = time.Now()
+		return
 	}
-
+	h.procState = drivers.TaskStateExited
-func (h *taskHandle) stats(ctx context.Context, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
+	h.exitResult.ExitCode = ps.ExitCode
-	ch := make(chan *drivers.TaskResourceUsage)
+	h.exitResult.Signal = ps.Signal
-
+	h.completedAt = ps.Time
-	return ch, nil
-}
-
-// shutdown shuts down the container, with `timeout` grace period
-// before killing the container with SIGKILL.
-func (h *taskHandle) shutdown(timeout time.Duration) error {
-	// Implement shutdown of the task. Shutdown should be tried
-	// gracefully first. If its past the timeout, then this method
-	// should do a hard shutdown and return
-	return nil
 }

hello/state.go

@@ -1,4 +1,4 @@
-package skeleton
+package hello
 
 import (
 	"sync"

main.go

@@ -1,12 +1,10 @@
-// +build linux
-
 package main
 
 import (
 	log "github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/nomad-skeleton-driver-plugin/hello"
 
 	"github.com/hashicorp/nomad/plugins"
-	"github.com/hashicorp/nomad-driver-skeleton/pkg/plugin"
 )
 
 func main() {
@@ -16,6 +14,5 @@ func main() {
 
 // factory returns a new instance of a nomad driver plugin
 func factory(log log.Logger) interface{} {
-	return skeleton.NewSkeletonDriver(log)
+	return hello.NewPlugin(log)
 }
-

pkg/plugin/driver.go

@@ -1,330 +0,0 @@
-package skeleton
-
-import (
-	"context"
-	"fmt"
-	"time"
-
-	hclog "github.com/hashicorp/go-hclog"
-	"github.com/hashicorp/nomad/drivers/shared/eventer"
-	"github.com/hashicorp/nomad/plugins/base"
-	"github.com/hashicorp/nomad/plugins/drivers"
-	"github.com/hashicorp/nomad/plugins/shared/hclspec"
-	structs "github.com/hashicorp/nomad/plugins/shared/structs"
-)
-
-const (
-	// pluginName is the name of the plugin
-	pluginName = "test-plugin"
-
-	// fingerprintPeriod is the interval at which the driver will send fingerprint responses
-	fingerprintPeriod = 30 * time.Second
-
-	// taskHandleVersion is the version of task handle which this driver sets
-	// and understands how to decode driver state
-	taskHandleVersion = 1
-)
-
-var (
-	// pluginInfo is the response returned for the PluginInfo RPC
-	pluginInfo = &base.PluginInfoResponse{
-		Type:              base.PluginTypeDriver,
-		PluginApiVersions: []string{"0.1.0"},
-		PluginVersion:     "0.0.1",
-		Name:              pluginName,
-	}
-
-	// configSpec is the hcl specification returned by the ConfigSchema RPC
-	configSpec = hclspec.NewObject(map[string]*hclspec.Spec{
-		"enabled": hclspec.NewDefault(
-			hclspec.NewAttr("enabled", "bool", false),
-			hclspec.NewLiteral("true"),
-		),
-	})
-
-	// taskConfigSpec is the hcl specification for the driver config section of
-	// a taskConfig within a job. It is returned in the TaskConfigSchema RPC
-	taskConfigSpec = hclspec.NewObject(map[string]*hclspec.Spec{
-		"strconfig":   hclspec.NewAttr("strconfig", "string", true),
-		"boolcfg": hclspec.NewAttr("boolcfg", "bool", false),
-	})
-
-	// capabilities is returned by the Capabilities RPC and indicates what
-	// optional features this driver supports. This should be set according
-	// to the target run time
-	capabilities = &drivers.Capabilities{
-		SendSignals: true,
-		Exec:        false,
-	}
-)
-
-// Driver is a skeleton driver implementation. The fields in this struct
-// are to help plugin authors get started writing their runtime plugins.
-type Driver struct {
-	// eventer is used to handle multiplexing of TaskEvents calls such that an
-	// event can be broadcast to all callers
-	eventer *eventer.Eventer
-
-	// config is the driver configuration set by the SetConfig RPC
-	config *Config
-
-	// nomadConfig is the client config from nomad
-	nomadConfig *base.ClientDriverConfig
-
-	// tasks is the in memory datastore mapping taskIDs to rawExecDriverHandles
-	tasks *taskStore
-
-	// ctx is the context for the driver. It is passed to other subsystems to
-	// coordinate shutdown
-	ctx context.Context
-
-	// signalShutdown is called when the driver is shutting down and cancels the
-	// ctx passed to any subsystems
-	signalShutdown context.CancelFunc
-
-	// logger will log to the Nomad agent
-	logger hclog.Logger
-}
-
-// Config is the driver configuration set by the SetConfig RPC call
-type Config struct {
-	// Enabled is set to true to enable this driver
-	Enabled bool `codec:"enabled"`
-}
-
-// TaskConfig is the driver configuration of a task within a job
-type TaskConfig struct {
-	StrConfig string   `codec:"strconfig"`
-	BoolConfig  bool `codec:"boolconfig"`
-}
-
-// TaskState is the state which is encoded in the handle returned in
-// StartTask. This information is needed to rebuild the task state and handler
-// during recovery.
-type TaskState struct {
-	TaskConfig    *drivers.TaskConfig
-	ContainerName string
-	StartedAt     time.Time
-	PID           int
-}
-
-// NewSkeletonDriver returns a new DriverPlugin implementation
-func NewSkeletonDriver(logger hclog.Logger) drivers.DriverPlugin {
-	ctx, cancel := context.WithCancel(context.Background())
-	logger = logger.Named(pluginName)
-
-	return &Driver{
-		eventer:        eventer.NewEventer(ctx, logger),
-		config:         &Config{},
-		tasks:          newTaskStore(),
-		ctx:            ctx,
-		signalShutdown: cancel,
-		logger:         logger,
-	}
-}
-
-func (d *Driver) PluginInfo() (*base.PluginInfoResponse, error) {
-	return pluginInfo, nil
-}
-
-func (d *Driver) ConfigSchema() (*hclspec.Spec, error) {
-	return configSpec, nil
-}
-
-func (d *Driver) SetConfig(cfg *base.Config) error {
-	var config Config
-	if len(cfg.PluginConfig) != 0 {
-		if err := base.MsgPackDecode(cfg.PluginConfig, &config); err != nil {
-			return err
-		}
-	}
-
-	d.config = &config
-	if cfg.AgentConfig != nil {
-		d.nomadConfig = cfg.AgentConfig.Driver
-	}
-
-	return nil
-}
-
-func (d *Driver) Shutdown(ctx context.Context) error {
-	d.signalShutdown()
-	return nil
-}
-
-func (d *Driver) TaskConfigSchema() (*hclspec.Spec, error) {
-	return taskConfigSpec, nil
-}
-
-func (d *Driver) Capabilities() (*drivers.Capabilities, error) {
-	return capabilities, nil
-}
-
-func (d *Driver) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
-	ch := make(chan *drivers.Fingerprint)
-	go d.handleFingerprint(ctx, ch)
-	return ch, nil
-}
-
-func (d *Driver) handleFingerprint(ctx context.Context, ch chan<- *drivers.Fingerprint) {
-	defer close(ch)
-	ticker := time.NewTimer(0)
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-d.ctx.Done():
-			return
-		case <-ticker.C:
-			ticker.Reset(fingerprintPeriod)
-			ch <- d.buildFingerprint()
-		}
-	}
-}
-
-func (d *Driver) buildFingerprint() *drivers.Fingerprint {
-	var health drivers.HealthState
-	var desc string
-	attrs := map[string]*structs.Attribute{}
-
-	// Implement finger printing logic here to populate health and driver attributes
-
-	return &drivers.Fingerprint{
-		Attributes:        attrs,
-		Health:            health,
-		HealthDescription: desc,
-	}
-}
-
-func (d *Driver) RecoverTask(handle *drivers.TaskHandle) error {
-	if handle == nil {
-		return fmt.Errorf("error: handle cannot be nil")
-	}
-
-	if _, ok := d.tasks.Get(handle.Config.ID); ok {
-		return nil
-	}
-
-	var taskState TaskState
-	if err := handle.GetDriverState(&taskState); err != nil {
-		return fmt.Errorf("failed to decode task state from handle: %v", err)
-	}
-
-	var driverConfig TaskConfig
-	if err := taskState.TaskConfig.DecodeDriverConfig(&driverConfig); err != nil {
-		return fmt.Errorf("failed to decode driver config: %v", err)
-	}
-
-	// Implement driver specific way to reattach to a running task or restart
-	return nil
-}
-
-// StartTask setup the task exec and calls the container excecutor
-func (d *Driver) StartTask(cfg *drivers.TaskConfig) (*drivers.TaskHandle, *drivers.DriverNetwork, error) {
-	if _, ok := d.tasks.Get(cfg.ID); ok {
-		return nil, nil, fmt.Errorf("task with ID %q already started", cfg.ID)
-	}
-
-	var driverConfig TaskConfig
-	if err := cfg.DecodeDriverConfig(&driverConfig); err != nil {
-		return nil, nil, fmt.Errorf("failed to decode driver config: %v", err)
-	}
-
-	handle := drivers.NewTaskHandle(taskHandleVersion)
-	handle.Config = cfg
-
-	// Implement driver specific mechanism to start the task here
-
-	return nil, nil, nil
-
-}
-
-func (d *Driver) WaitTask(ctx context.Context, taskID string) (<-chan *drivers.ExitResult, error) {
-	handle, ok := d.tasks.Get(taskID)
-	if !ok {
-		return nil, drivers.ErrTaskNotFound
-	}
-
-	ch := make(chan *drivers.ExitResult)
-	go d.handleWait(ctx, handle, ch)
-
-	return ch, nil
-}
-
-func (d *Driver) handleWait(ctx context.Context, handle *taskHandle, ch chan *drivers.ExitResult) {
-	defer close(ch)
-
-	ticker := time.NewTicker(1 * time.Second)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-d.ctx.Done():
-			return
-		case <-ticker.C:
-			s := handle.TaskStatus()
-			if s.State == drivers.TaskStateExited {
-				ch <- handle.exitResult
-			}
-		}
-	}
-}
-
-func (d *Driver) StopTask(taskID string, timeout time.Duration, signal string) error {
-	handle, ok := d.tasks.Get(taskID)
-	if !ok {
-		return drivers.ErrTaskNotFound
-	}
-
-	if err := handle.shutdown(timeout); err != nil {
-		return fmt.Errorf("executor Shutdown failed: %v", err)
-	}
-
-	return nil
-}
-
-func (d *Driver) DestroyTask(taskID string, force bool) error {
-	handle, ok := d.tasks.Get(taskID)
-	if !ok {
-		return drivers.ErrTaskNotFound
-	}
-
-	if handle.IsRunning() && !force {
-		return fmt.Errorf("cannot destroy running task")
-	}
-
-	d.tasks.Delete(taskID)
-	return nil
-}
-
-func (d *Driver) InspectTask(taskID string) (*drivers.TaskStatus, error) {
-	handle, ok := d.tasks.Get(taskID)
-	if !ok {
-		return nil, drivers.ErrTaskNotFound
-	}
-
-	return handle.TaskStatus(), nil
-}
-
-func (d *Driver) TaskStats(ctx context.Context, taskID string, interval time.Duration) (<-chan *drivers.TaskResourceUsage, error) {
-	handle, ok := d.tasks.Get(taskID)
-	if !ok {
-		return nil, drivers.ErrTaskNotFound
-	}
-
-	return handle.stats(ctx, interval)
-}
-
-func (d *Driver) TaskEvents(ctx context.Context) (<-chan *drivers.TaskEvent, error) {
-	return d.eventer.TaskEvents(ctx)
-}
-
-func (d *Driver) SignalTask(taskID string, signal string) error {
-	return fmt.Errorf("This driver does not support signals")
-}
-
-func (d *Driver) ExecTask(taskID string, cmd []string, timeout time.Duration) (*drivers.ExecTaskResult, error) {
-	return nil, fmt.Errorf("This driver does not support exec") //TODO
-}