initial commit

Author: progrium

.gitignore

@@ -0,0 +1 @@
+dockerhook

LICENSE

@@ -0,0 +1,7 @@
+Copyright (C) 2014 Jeff Lindsay
+
+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.

Makefile

@@ -0,0 +1,21 @@
+NAME=dockerhook
+HARDWARE=$(shell uname -m)
+VERSION=0.1.0
+
+build:
+	go get || true && go build
+
+release:
+	rm -rf release
+	mkdir release
+	GOOS=linux go build -o release/$(NAME)
+	cd release && tar -zcf $(NAME)_$(VERSION)_linux_$(HARDWARE).tgz $(NAME)
+	GOOS=darwin go build -o release/$(NAME)
+	cd release && tar -zcf $(NAME)_$(VERSION)_darwin_$(HARDWARE).tgz $(NAME)
+	rm release/$(NAME)
+	echo "$(VERSION)" > release/version
+	echo "progrium/$(NAME)" > release/repo
+	gh-release # https://github.com/progrium/gh-release
+
+
+.PHONY: release

README.md

@@ -0,0 +1,127 @@
+package main
+
+import (
+	"log"
+	"os"
+	"flag"
+	"path/filepath"
+	"os/exec"
+	"syscall"
+	"bytes"
+	"encoding/json"
+
+	"github.com/flynn/go-shlex"
+	dockerapi "github.com/fsouza/go-dockerclient"
+)
+
+var debug = flag.Bool("d", false, "debug mode displays handler output")
+var env = flag.Bool("e", false, "pass environment to handler")
+var shell = flag.Bool("s", false, "run handler via SHELL")
+
+func init() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %v [options] <hook-handler>\n\n", os.Args[0])
+		flag.PrintDefaults()
+	}
+}
+
+func assert(err error) {
+	if err != nil {
+		log.Fatal("fatal:", err)
+	}
+}
+
+func getopt(name, def string) string {
+	if env := os.Getenv(name); env != "" {
+		return env
+	}
+	return def
+}
+
+func exitStatus(err error) (int, error) {
+	if err != nil {
+		if exiterr, ok := err.(*exec.ExitError); ok {
+			// There is no platform independent way to retrieve
+			// the exit code, but the following will work on Unix
+			if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
+				return int(status.ExitStatus()), nil
+			}
+		}
+		return 0, err
+	}
+	return 0, nil
+}
+
+func inspect(docker *dockerapi.Client, id string) bytes.Buffer {
+	var b bytes.Buffer
+	container, err := docker.InspectContainer(id)
+	if err != nil {
+		log.Println("warn: unable to inspect container:", id[:12], err)
+		return b
+	}
+	data, err := json.Marshal(m)
+	if err != nil {
+		log.Println("warn: unable to marshal container data:", id[:12], err)
+		return b
+	}
+	b.Write(data)
+	return b
+}
+
+func trigger(hook []string, event, id string, data bytes.Buffer) {
+	hook = append(hook, event, id)
+	var cmd exec.Cmd
+	if *shell {
+		cmd = exec.Command(os.Getenv("SHELL"), "-c", strings.Join(hook, " "))
+	} else {	
+		cmd = exec.Command(hook[0], hook[1:]...)
+	}
+	if !*env {
+		cmd.Env = []string{}	
+	}
+	cmd.Stdin = data
+	if *debug {
+		cmd.Stdout = os.Stdout // TODO: wrap in log output
+	}
+	cmd.Stderr = os.Stderr // TODO: wrap in log output
+	status, err := exitStatus(cmd.Run())
+	if err != nil {
+		log.Println("error:", event, status, err)
+	}
+}
+
+func main() {
+	flag.Parse()
+	if flag.NArg() < 2 {
+		flag.Usage()
+		os.Exit(64)
+	}
+
+	hook, err := shlex.Split(flag.Arg(1))
+	if err != nil {
+		log.Fatalln("fatal: unable to parse handler command:", err)
+	}
+	hook[0], err = filepath.Abs(hook[0])
+	if err != nil {
+		log.Fatalln("fatal: invalid handler executable path:", err)
+	}
+
+	docker, err := dockerapi.NewClient(getopt("DOCKER_HOST", "unix:///var/run/docker.sock"))
+	assert(err)
+
+	containers, err := docker.ListContainers(dockerapi.ListContainersOptions{})
+	assert(err)
+	for _, listing := range containers {
+		trigger(hook, "exists", listing.ID, inspect(docker, listing.ID))
+	}
+
+	events := make(chan *dockerapi.APIEvents)
+	assert(docker.AddEventListener(events))
+	log.Println("info: listening for Docker events...")
+	for msg := range events {
+		log.Println("info: event:", msg.Status, msg.ID[:12])
+		go trigger(hook, msg.Status, msg.ID, inspect(docker, msg.ID))
+	}
+
+	log.Fatal("fatal: docker event loop closed") // todo: reconnect?
+}