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c000cb6471
Docker-DCO-1.1-Signed-off-by: Johannes 'fish' Ziemke <github@freigeist.org> (github: discordianfish)
130 lines
3.3 KiB
Go
130 lines
3.3 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"flag"
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"fmt"
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"github.com/dotcloud/docker"
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"os"
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"strings"
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"text/template"
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)
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var templates = map[string]string{
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"upstart": `description "{{.description}}"
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author "{{.author}}"
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start on filesystem and started lxc-net and started docker
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stop on runlevel [!2345]
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respawn
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exec /home/vagrant/goroot/bin/docker start -a {{.container_id}}
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`,
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"systemd": `[Unit]
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Description={{.description}}
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Author={{.author}}
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After=docker.service
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[Service]
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Restart=always
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ExecStart=/usr/bin/docker start -a {{.container_id}}
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ExecStop=/usr/bin/docker stop -t 2 {{.container_id}}
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[Install]
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WantedBy=local.target
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`,
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}
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func main() {
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// Parse command line for custom options
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kind := flag.String("t", "upstart", "Type of manager requested")
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author := flag.String("a", "<none>", "Author of the image")
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description := flag.String("d", "<none>", "Description of the image")
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flag.Usage = func() {
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fmt.Fprintf(os.Stderr, "\nUsage: manager <container id>\n\n")
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flag.PrintDefaults()
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}
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flag.Parse()
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// We require at least the container ID
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if flag.NArg() != 1 {
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println(flag.NArg())
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flag.Usage()
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return
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}
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// Check that the requested process manager is supported
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if _, exists := templates[*kind]; !exists {
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panic("Unknown script template")
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}
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// Load the requested template
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tpl, err := template.New("processManager").Parse(templates[*kind])
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if err != nil {
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panic(err)
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}
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// Create stdout/stderr buffers
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bufOut := bytes.NewBuffer(nil)
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bufErr := bytes.NewBuffer(nil)
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// Instanciate the Docker CLI
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cli := docker.NewDockerCli(nil, bufOut, bufErr, "unix", "/var/run/docker.sock", false, nil)
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// Retrieve the container info
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if err := cli.CmdInspect(flag.Arg(0)); err != nil {
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// As of docker v0.6.3, CmdInspect always returns nil
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panic(err)
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}
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// If there is nothing in the error buffer, then the Docker daemon is there and the container has been found
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if bufErr.Len() == 0 {
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// Unmarshall the resulting container data
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c := []*docker.Container{{}}
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if err := json.Unmarshal(bufOut.Bytes(), &c); err != nil {
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panic(err)
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}
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// Reset the buffers
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bufOut.Reset()
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bufErr.Reset()
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// Retrieve the info of the linked image
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if err := cli.CmdInspect(c[0].Image); err != nil {
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panic(err)
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}
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// If there is nothing in the error buffer, then the image has been found.
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if bufErr.Len() == 0 {
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// Unmarshall the resulting image data
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img := []*docker.Image{{}}
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if err := json.Unmarshal(bufOut.Bytes(), &img); err != nil {
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panic(err)
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}
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// If no author has been set, use the one from the image
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if *author == "<none>" && img[0].Author != "" {
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*author = strings.Replace(img[0].Author, "\"", "", -1)
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}
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// If no description has been set, use the comment from the image
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if *description == "<none>" && img[0].Comment != "" {
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*description = strings.Replace(img[0].Comment, "\"", "", -1)
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}
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}
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}
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/// Old version: Wrtie the resulting script to file
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// f, err := os.OpenFile(kind, os.O_CREATE|os.O_WRONLY, 0755)
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// if err != nil {
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// panic(err)
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// }
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// defer f.Close()
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// Create a map with needed data
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data := map[string]string{
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"author": *author,
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"description": *description,
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"container_id": flag.Arg(0),
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}
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// Process the template and output it on Stdout
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if err := tpl.Execute(os.Stdout, data); err != nil {
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panic(err)
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}
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}
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