├── .gitignore
├── LICENSE
├── Makefile
├── README.md
├── debughook
└── dockerhook.go


/.gitignore:
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1 | dockerhook
2 | release
3 | 


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/LICENSE:
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1 | Copyright (C) 2014 Jeff Lindsay
2 | 
3 | 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:
4 | 
5 | The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
6 | 
7 | 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.


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/Makefile:
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 1 | NAME=dockerhook
 2 | HARDWARE=$(shell uname -m)
 3 | VERSION=0.1.0
 4 | 
 5 | build:
 6 | 	go get || true && go build
 7 | 
 8 | release:
 9 | 	rm -rf release
10 | 	mkdir release
11 | 	GOOS=linux go build -o release/$(NAME)
12 | 	cd release && tar -zcf $(NAME)_$(VERSION)_linux_$(HARDWARE).tgz $(NAME)
13 | 	GOOS=darwin go build -o release/$(NAME)
14 | 	cd release && tar -zcf $(NAME)_$(VERSION)_darwin_$(HARDWARE).tgz $(NAME)
15 | 	rm release/$(NAME)
16 | 	echo "$(VERSION)" > release/version
17 | 	echo "progrium/$(NAME)" > release/repo
18 | 	gh-release # https://github.com/progrium/gh-release
19 | 
20 | 
21 | .PHONY: release


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/README.md:
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1 | # dockerhook
2 | 
3 | Daemon that listens for Docker events and triggers a hook script for each event, passing any container data to STDIN.
4 | 
5 | ## Notes
6 | 
7 | Currently using a patched version of Docker client, so building may fail for you. There is a binary release available for now.


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/debughook:
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1 | #!/bin/bash
2 | mkdir -p /tmp/dockerhook/$1
3 | cat > /tmp/dockerhook/$1/$2


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/dockerhook.go:
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  1 | package main
  2 | 
  3 | import (
  4 | 	"log"
  5 | 	"os"
  6 | 	"flag"
  7 | 	"strings"
  8 | 	"fmt"
  9 | 	"path/filepath"
 10 | 	"os/exec"
 11 | 	"syscall"
 12 | 	"bytes"
 13 | 	"encoding/json"
 14 | 
 15 | 	"github.com/flynn/go-shlex"
 16 | 	dockerapi "github.com/fsouza/go-dockerclient"
 17 | )
 18 | 
 19 | var debug = flag.Bool("d", false, "debug mode displays handler output")
 20 | var shell = flag.Bool("s", false, "run handler via SHELL")
 21 | 
 22 | var skipInspect = map[string]bool {
 23 |     "destroy": true,
 24 |     "untag": true,
 25 |     "delete": true,
 26 | }
 27 | 
 28 | func init() {
 29 | 	flag.Usage = func() {
 30 | 		fmt.Fprintf(os.Stderr, "Usage: %v [options] <hook-handler>\n\n", os.Args[0])
 31 | 		flag.PrintDefaults()
 32 | 	}
 33 | }
 34 | 
 35 | func assert(err error) {
 36 | 	if err != nil {
 37 | 		log.Fatal("fatal: ", err)
 38 | 	}
 39 | }
 40 | 
 41 | func getopt(name, def string) string {
 42 | 	if env := os.Getenv(name); env != "" {
 43 | 		return env
 44 | 	}
 45 | 	return def
 46 | }
 47 | 
 48 | func exitStatus(err error) (int, error) {
 49 | 	if err != nil {
 50 | 		if exiterr, ok := err.(*exec.ExitError); ok {
 51 | 			// There is no platform independent way to retrieve
 52 | 			// the exit code, but the following will work on Unix
 53 | 			if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
 54 | 				return int(status.ExitStatus()), nil
 55 | 			}
 56 | 		}
 57 | 		return 0, err
 58 | 	}
 59 | 	return 0, nil
 60 | }
 61 | 
 62 | func inspect(docker *dockerapi.Client, id string) *bytes.Buffer {
 63 | 	var b bytes.Buffer
 64 | 	container, err := docker.InspectContainer(id)
 65 | 	if err != nil {
 66 | 		log.Println("warn: unable to inspect container:", id[:12], err)
 67 | 		return &b
 68 | 	}
 69 | 	data, err := json.Marshal(container)
 70 | 	if err != nil {
 71 | 		log.Println("warn: unable to marshal container data:", id[:12], err)
 72 | 		return &b
 73 | 	}
 74 | 	b.Write(data)
 75 | 	return &b
 76 | }
 77 | 
 78 | func trigger(hook []string, event, id string, docker *dockerapi.Client) {
 79 | 	log.Println("info: trigger:", id[:12], event)
 80 | 	hook = append(hook, event, id)
 81 | 	var cmd *exec.Cmd
 82 | 	if *shell && os.Getenv("SHELL") != "" {
 83 | 		cmd = exec.Command(os.Getenv("SHELL"), "-c", strings.Join(hook, " "))
 84 | 	} else {	
 85 | 		cmd = exec.Command(hook[0], hook[1:]...)
 86 | 	}
 87 | 	if !skipInspect[event] {
 88 | 		cmd.Stdin = inspect(docker, id)
 89 | 	}
 90 | 	if *debug {
 91 | 		cmd.Stdout = os.Stdout // TODO: wrap in log output
 92 | 	}
 93 | 	cmd.Stderr = os.Stderr // TODO: wrap in log output
 94 | 	status, err := exitStatus(cmd.Run())
 95 | 	if err != nil {
 96 | 		log.Println("error:", event, status, err)
 97 | 	}
 98 | }
 99 | 
100 | func main() {
101 | 	flag.Parse()
102 | 	if flag.NArg() < 1 {
103 | 		flag.Usage()
104 | 		os.Exit(64)
105 | 	}
106 | 
107 | 	hook, err := shlex.Split(flag.Arg(0))
108 | 	if err != nil {
109 | 		log.Fatalln("fatal: unable to parse handler command:", err)
110 | 	}
111 | 	hook[0], err = filepath.Abs(hook[0])
112 | 	if err != nil {
113 | 		log.Fatalln("fatal: invalid handler executable path:", err)
114 | 	}
115 | 
116 | 	if os.Getenv("DOCKER_HOST") == "" {
117 | 		assert(os.Setenv("DOCKER_HOST", "unix:///var/run/docker.sock"))
118 | 	}
119 | 	docker, err := dockerapi.NewClientFromEnv()
120 | 	assert(err)
121 | 
122 | 	containers, err := docker.ListContainers(dockerapi.ListContainersOptions{})
123 | 	assert(err)
124 | 	for _, listing := range containers {
125 | 		trigger(hook, "exists", listing.ID, docker)
126 | 	}
127 | 
128 | 	events := make(chan *dockerapi.APIEvents)
129 | 	assert(docker.AddEventListener(events))
130 | 	log.Println("info: listening for Docker events...")
131 | 	for msg := range events {
132 | 		go trigger(hook, msg.Status, msg.ID, docker)
133 | 	}
134 | 
135 | 	log.Fatal("fatal: docker event loop closed") // todo: reconnect?
136 | }


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