drone-docker-buildx/main.go
2016-02-21 11:06:39 +01:00

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package main
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/drone/drone-plugin-go/plugin"
)
type Save struct {
// Absolute or relative path
File string `json:"destination"`
// Only save specified tags (optional)
Tags StrSlice `json:"tag"`
}
type Docker struct {
Storage string `json:"storage_driver"`
Registry string `json:"registry"`
Mirror string `json:"mirror"`
Insecure bool `json:"insecure"`
Username string `json:"username"`
Password string `json:"password"`
Email string `json:"email"`
Auth string `json:"auth"`
Repo string `json:"repo"`
ForceTag bool `json:"force_tag"`
Tag StrSlice `json:"tag"`
File string `json:"file"`
Context string `json:"context"`
Bip string `json:"bip"`
Dns []string `json:"dns"`
Load string `json:"load"`
Save Save `json:"save"`
BuildArgs []string `json:"build_args"`
}
var (
buildCommit string
)
func main() {
fmt.Printf("Drone Docker Plugin built from %s\n", buildCommit)
workspace := plugin.Workspace{}
build := plugin.Build{}
vargs := Docker{}
plugin.Param("workspace", &workspace)
plugin.Param("build", &build)
plugin.Param("vargs", &vargs)
plugin.MustParse()
// in case someone uses the shorthand repository name
// with a custom registry, we should concatinate so that
// we have the fully qualified image name.
if strings.Count(vargs.Repo, "/") <= 1 && len(vargs.Registry) != 0 && !strings.HasPrefix(vargs.Repo, vargs.Registry) {
vargs.Repo = fmt.Sprintf("%s/%s", vargs.Registry, vargs.Repo)
}
// Set the Registry value
if len(vargs.Registry) == 0 {
vargs.Registry = "https://index.docker.io/v1/"
}
// Set the Dockerfile name
if len(vargs.File) == 0 {
vargs.File = "Dockerfile"
}
// Set the Context value
if len(vargs.Context) == 0 {
vargs.Context = "."
}
// Set the Tag value
if vargs.Tag.Len() == 0 {
vargs.Tag = StrSlice{[]string{"latest"}}
}
// Get absolute path for 'save' file
if len(vargs.Save.File) != 0 {
if !filepath.IsAbs(vargs.Save.File) {
vargs.Save.File = filepath.Join(workspace.Path, vargs.Save.File)
}
}
// Get absolute path for 'load' file
if len(vargs.Load) != 0 {
if !filepath.IsAbs(vargs.Load) {
vargs.Load = filepath.Join(workspace.Path, vargs.Load)
}
}
go func() {
args := []string{"-d"}
if len(vargs.Storage) != 0 {
args = append(args, "-s", vargs.Storage)
}
if vargs.Insecure && len(vargs.Registry) != 0 {
args = append(args, "--insecure-registry", vargs.Registry)
}
if len(vargs.Mirror) != 0 {
args = append(args, "--registry-mirror", vargs.Mirror)
}
if len(vargs.Bip) != 0 {
args = append(args, "--bip", vargs.Bip)
}
for _, value := range vargs.Dns {
args = append(args, "--dns", value)
}
cmd := exec.Command("/usr/bin/docker", args...)
if os.Getenv("DOCKER_LAUNCH_DEBUG") == "true" {
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
} else {
cmd.Stdout = ioutil.Discard
cmd.Stderr = ioutil.Discard
}
trace(cmd)
cmd.Run()
}()
// ping Docker until available
for i := 0; i < 3; i++ {
cmd := exec.Command("/usr/bin/docker", "info")
cmd.Stdout = ioutil.Discard
cmd.Stderr = ioutil.Discard
err := cmd.Run()
if err == nil {
break
}
time.Sleep(time.Second * 5)
}
// Login to Docker
if len(vargs.Username) != 0 {
cmd := exec.Command("/usr/bin/docker", "login", "-u", vargs.Username, "-p", vargs.Password, "-e", vargs.Email, vargs.Registry)
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Run()
if err != nil {
fmt.Println("Login failed.")
os.Exit(1)
}
} else {
fmt.Printf("A username was not specified. Assuming anonymous publishing.\n")
}
// Docker environment info
cmd := exec.Command("/usr/bin/docker", "version")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
cmd.Run()
cmd = exec.Command("/usr/bin/docker", "info")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
cmd.Run()
// Restore from tarred image repository
if len(vargs.Load) != 0 {
if _, err := os.Stat(vargs.Load); err != nil {
fmt.Printf("Archive %s does not exist. Building from scratch.\n", vargs.Load)
} else {
cmd := exec.Command("/usr/bin/docker", "load", "-i", vargs.Load)
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
err := cmd.Run()
if err != nil {
os.Exit(1)
}
}
}
// Build the container
name := fmt.Sprintf("%s:%s", vargs.Repo, vargs.Tag.Slice()[0])
cmd = exec.Command("/usr/bin/docker", "build", "--pull=true", "--rm=true", "-f", vargs.File, "-t", name)
for _, value := range vargs.BuildArgs {
cmd.Args = append(cmd.Args, "--build-arg", value)
}
cmd.Args = append(cmd.Args, vargs.Context)
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
err := cmd.Run()
if err != nil {
os.Exit(1)
}
// Creates image tags
for _, tag := range vargs.Tag.Slice()[1:] {
name_ := fmt.Sprintf("%s:%s", vargs.Repo, tag)
cmd = exec.Command("/usr/bin/docker", "tag")
if vargs.ForceTag {
cmd.Args = append(cmd.Args, "--force=true")
}
cmd.Args = append(cmd.Args, name, name_)
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
err = cmd.Run()
if err != nil {
os.Exit(1)
}
}
// Push the image and tags to the registry
for _, tag := range vargs.Tag.Slice() {
name_ := fmt.Sprintf("%s:%s", vargs.Repo, tag)
cmd = exec.Command("/usr/bin/docker", "push", name_)
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
err = cmd.Run()
if err != nil {
os.Exit(1)
}
}
// Save to tarred image repository
if len(vargs.Save.File) != 0 {
// if the destination directory does not exist, create it
dir := filepath.Dir(vargs.Save.File)
os.MkdirAll(dir, 0755)
cmd = exec.Command("/usr/bin/docker", "save", "-o", vargs.Save.File)
// Limit saving to the given tags
if vargs.Save.Tags.Len() != 0 {
for _, tag := range vargs.Save.Tags.Slice() {
name_ := fmt.Sprintf("%s:%s", vargs.Repo, tag)
cmd.Args = append(cmd.Args, name_)
}
} else {
cmd.Args = append(cmd.Args, vargs.Repo)
}
cmd.Dir = workspace.Path
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
trace(cmd)
err := cmd.Run()
if err != nil {
os.Exit(1)
}
}
}
// Trace writes each command to standard error (preceded by a $ ) before it
// is executed. Used for debugging your build.
func trace(cmd *exec.Cmd) {
fmt.Println("$", strings.Join(cmd.Args, " "))
}
// authorize is a helper function that authorizes the Docker client
// by manually creating the Docker authentication file.
func authorize(d *Docker) error {
var path = "/root/.dockercfg" // TODO should probably use user.Home() for good measure
var data = fmt.Sprintf(dockerconf, d.Registry, d.Auth, d.Email)
return ioutil.WriteFile(path, []byte(data), 0644)
}
var dockerconf = `
{
"%s": {
"auth": "%s",
"email": "%s"
}
}
`