draft: docker support

.goreleaser.yml

@@ -4,15 +4,21 @@ builds:
       - CGO_ENABLED=0
     goos:
       - linux
-      - darwin
-      - windows
+      # - darwin
+      # - windows
     goarch:
-      - 386
+      # - 386
       - amd64
-      - arm
-      - arm64
+      # - arm
+      # - arm64
 checksum:
   name_template: '{{ .ProjectName }}_checksums.txt'
+docker:
+  - goos: linux
+    goarch: amd64
+    binary: goreleaser
+    dockerfile: Dockerfile
+    image: caarlos0/goreleaser
 archive:
   name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
   replacements:

Dockerfile

@@ -0,0 +1,4 @@
+FROM scratch
+COPY goreleaser /goreleaser
+ENTRYPOINT ["/goreleaser"]
+

config/config.go

@@ -159,6 +159,19 @@ type Checksum struct {
 	XXX map[string]interface{} `yaml:",inline"`
 }
 
+// Docker image config
+type Docker struct {
+	Binary     string `yaml:",omitempty"`
+	Goos       string `yaml:",omitempty"`
+	Goarch     string `yaml:",omitempty"`
+	Goarm      string `yaml:",omitempty"`
+	Image      string `yaml:",omitempty"`
+	Dockerfile string `yaml:",omitempty"`
+
+	// Capture all undefined fields and should be empty after loading
+	XXX map[string]interface{} `yaml:",inline"`
+}
+
 // Project includes all project configuration
 type Project struct {
 	ProjectName string    `yaml:"project_name,omitempty"`
@@ -170,6 +183,7 @@ type Project struct {
 	Snapcraft   Snapcraft `yaml:",omitempty"`
 	Snapshot    Snapshot  `yaml:",omitempty"`
 	Checksum    Checksum  `yaml:",omitempty"`
+	Docker      []Docker  `yaml:",omitempty"`
 
 	// this is a hack ¯\_(ツ)_/¯
 	SingleBuild Build `yaml:"build,omitempty"`
@@ -231,6 +245,9 @@ func checkOverflows(config Project) error {
 	}
 	overflow.check(config.Snapshot.XXX, "snapshot")
 	overflow.check(config.Checksum.XXX, "checksum")
+	for i, docker := range config.Docker {
+		overflow.check(docker.XXX, fmt.Sprintf("docker[%d]", i))
+	}
 	return overflow.err()
 }
 

goreleaserlib/goreleaser.go

@@ -10,17 +10,12 @@ import (
 	"github.com/goreleaser/goreleaser/config"
 	"github.com/goreleaser/goreleaser/context"
 	"github.com/goreleaser/goreleaser/pipeline"
-	"github.com/goreleaser/goreleaser/pipeline/archive"
-	"github.com/goreleaser/goreleaser/pipeline/brew"
 	"github.com/goreleaser/goreleaser/pipeline/build"
-	"github.com/goreleaser/goreleaser/pipeline/checksums"
 	"github.com/goreleaser/goreleaser/pipeline/cleandist"
 	"github.com/goreleaser/goreleaser/pipeline/defaults"
+	"github.com/goreleaser/goreleaser/pipeline/docker"
 	"github.com/goreleaser/goreleaser/pipeline/env"
-	"github.com/goreleaser/goreleaser/pipeline/fpm"
 	"github.com/goreleaser/goreleaser/pipeline/git"
-	"github.com/goreleaser/goreleaser/pipeline/release"
-	"github.com/goreleaser/goreleaser/pipeline/snapcraft"
 	yaml "gopkg.in/yaml.v2"
 )
 
@@ -30,12 +25,13 @@ var pipes = []pipeline.Pipe{
 	env.Pipe{},       // load and validate environment variables
 	cleandist.Pipe{}, // ensure ./dist is clean
 	build.Pipe{},     // build
-	archive.Pipe{},   // archive (tar.gz, zip, etc)
-	fpm.Pipe{},       // archive via fpm (deb, rpm, etc)
-	snapcraft.Pipe{}, // archive via snapcraft (snap)
-	checksums.Pipe{}, // checksums of the files
-	release.Pipe{},   // release to github
-	brew.Pipe{},      // push to brew tap
+	// archive.Pipe{},   // archive (tar.gz, zip, etc)
+	// fpm.Pipe{},       // archive via fpm (deb, rpm, etc)
+	// snapcraft.Pipe{}, // archive via snapcraft (snap)
+	// checksums.Pipe{}, // checksums of the files
+	// release.Pipe{},   // release to github
+	// brew.Pipe{},      // push to brew tap
+	docker.Pipe{}, // create and push docker images
 }
 
 // Flags interface represents an extractor of cli flags

pipeline/docker/docker.go

@@ -0,0 +1,107 @@
+// Package docker provides a Pipe that creates and pushes a Docker image
+package docker
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os/exec"
+	"path/filepath"
+
+	"github.com/apex/log"
+	"github.com/goreleaser/goreleaser/config"
+	"github.com/pkg/errors"
+
+	"github.com/goreleaser/goreleaser/context"
+	"github.com/goreleaser/goreleaser/pipeline"
+)
+
+// Pipe for checksums
+type Pipe struct{}
+
+// Description of the pipe
+func (Pipe) Description() string {
+	return "Creating Docker images"
+}
+
+// Run the pipe
+func (Pipe) Run(ctx *context.Context) (err error) {
+	if ctx.Config.Docker[0].Image == "" {
+		return pipeline.Skip("docker section is not configured")
+	}
+	if ctx.Config.Release.Draft {
+		return pipeline.Skip("release is marked as draft")
+	}
+	for _, docker := range ctx.Config.Docker {
+		var imagePlatform = docker.Goos + docker.Goarch + docker.Goarm
+		for platform, groups := range ctx.Binaries {
+			if platform != imagePlatform {
+				continue
+			}
+			for folder, binaries := range groups {
+				for _, binary := range binaries {
+					if binary.Name != docker.Binary {
+						continue
+					}
+					var err = doRun(ctx, folder, docker, binary)
+					if err != nil && !pipeline.IsSkip(err) {
+						return err
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func processDocker(ctx *context.Context, docker config.Docker) error {
+
+}
+
+func doRun(ctx *context.Context, folder string, docker config.Docker, binary context.Binary) error {
+	var root = filepath.Join(ctx.Config.Dist, folder)
+	var dockerfile = filepath.Join(root, "Dockerfile")
+	var image = fmt.Sprintf("%s:%s", docker.Image, ctx.Version)
+
+	bts, err := ioutil.ReadFile(docker.Dockerfile)
+	if err != nil {
+		return errors.Wrap(err, "failed to read dockerfile")
+	}
+	if err := ioutil.WriteFile(dockerfile, bts, 0755); err != nil {
+		return err
+	}
+	log.WithField("file", dockerfile).Info("wrote dockerfile")
+	if err := dockerBuild(root, image); err != nil {
+		return err
+	}
+	if !ctx.Publish {
+		return pipeline.Skip("--skip-publish is set")
+	}
+	if err := dockerPush(image); err != nil {
+		return err
+	}
+	return nil
+}
+
+func dockerBuild(root, image string) error {
+	log.Infof("building docker image: %s", image)
+	var cmd = exec.Command("docker", "build", "-t", image, root)
+	log.WithField("cmd", cmd).Debug("executing")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return errors.Wrapf(err, "failed to build docker image: \n%s", string(out))
+	}
+	log.Debugf("docker build output: \n%s", string(out))
+	return nil
+}
+
+func dockerPush(image string) error {
+	log.Infof("pushing docker image: %s", image)
+	var cmd = exec.Command("docker", "push", image)
+	log.WithField("cmd", cmd).Debug("executing")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return errors.Wrapf(err, "failed to push docker image: \n%s", string(out))
+	}
+	log.Debugf("docker push output: \n%s", string(out))
+	return nil
+}

pipeline/pipe.go

@@ -12,6 +12,11 @@ type Pipe interface {
 	Run(ctx *context.Context) error
 }
 
+func IsSkip(err error) bool {
+	_, ok := err.(ErrSkip)
+	return ok
+}
+
 // ErrSkip occurs when a pipe is skipped for some reason
 type ErrSkip struct {
 	reason string