Merge pull request #515 from goreleaser/docker-major-minor-etc

Docker major minor etc

.goreleaser.yml

@@ -25,6 +25,7 @@ dockers:
   - image: goreleaser/goreleaser
     tag_templates:
     - '{{ .Tag }}'
+    - 'v{{ .Major }}.{{ .Minor }}'
     - 'latest'
 archive:
   name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'

Gopkg.lock

@@ -56,6 +56,12 @@
   revision = "caa5f3f5742eb0535631e94fa5e171c74c0144b7"
   version = "v1.0.0"
 
+[[projects]]
+  name = "github.com/masterminds/semver"
+  packages = ["."]
+  revision = "15d8430ab86497c5c0da827b748823945e1cf1e1"
+  version = "v1.4.0"
+
 [[projects]]
   name = "github.com/mattn/go-colorable"
   packages = ["."]
@@ -154,6 +160,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "bce4694edbb58fe9615c3e2eff7fe9e2f041a6fac7be441ee28988416413cdc0"
+  inputs-digest = "29cc5012bc98dd429a87d7a638a221b2d0f5b12eaf5bea67576ffd362d88105b"
   solver-name = "gps-cdcl"
   solver-version = 1

docs/130-docker.md

@@ -51,10 +51,12 @@ dockers:
     # Path to the Dockerfile (from the project root).
     dockerfile: Dockerfile
     # Template of the docker tag. Defaults to `{{ .Version }}`. Other allowed
-    # fields are `.Tag` and `.Env.VARIABLE_NAME`.
+    # fields are `.Tag`, `.Major`, `.Minor` and `.Patch` and
+    # `.Env.VARIABLE_NAME`.
     tag_templates:
     - "{{ .Tag }}"
     - "{{ .Tag }}-{{ .Env.GO_VERSION }}"
+    - "v{{ .Major }}"
     - latest
     # If your Dockerfile copies files other than the binary itself,
     # you should list them here as well.
@@ -82,3 +84,36 @@ Then you can run:
 ```console
 GOVERSION_NR=$(go version | awk '{print $3}') goreleaser
 ```
+
+## Keeping docker images updated for current major
+
+Some users might want to when version to push docker tags `:v1`, `:v1.6`,
+`:v1.6.4` and `:latest` when `v1.6.4` (for example) is built. That can be
+accomplished by using multiple `tag_templates`:
+
+```yaml
+# .goreleaser.yml
+dockers:
+  -
+    binary: mybinary
+    image: myuser/myimage
+    tag_templates:
+    - "{{ .Tag }}"
+    - "v{{ .Major }}"
+    - "v{{ .Major }}.{{ .Minor }}"
+    - latest
+```
+
+This will build and publish the following images:
+
+* myuser/myimage:v1.6.4
+* myuser/myimage:v1
+* myuser/myimage:v1.6
+* myuser/myimage:latest
+
+Hope this feature serves you well!
+
+More info:
+
+* [#461](https://github.com/goreleaser/goreleaser/issues/461)
+* [#505](https://github.com/goreleaser/goreleaser/issues/505)

pipeline/docker/docker.go

@@ -13,6 +13,7 @@ import (
 	"github.com/apex/log"
 	"github.com/apex/log/handlers/cli"
 	"github.com/fatih/color"
+	"github.com/masterminds/semver"
 	"github.com/pkg/errors"
 	"golang.org/x/sync/errgroup"
 
@@ -129,13 +130,21 @@ func tagName(ctx *context.Context, tagTemplate string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	sv, err := semver.NewVersion(ctx.Git.CurrentTag)
+	if err != nil {
+		return "", err
+	}
 	data := struct {
-		Version, Tag string
-		Env          map[string]string
+		Version, Tag        string
+		Major, Minor, Patch int64
+		Env                 map[string]string
 	}{
 		Version: ctx.Version,
 		Tag:     ctx.Git.CurrentTag,
 		Env:     ctx.Env,
+		Major:   sv.Major(),
+		Minor:   sv.Minor(),
+		Patch:   sv.Patch(),
 	}
 	err = t.Execute(&out, data)
 	return out.String(), err

pipeline/docker/docker_test.go

@@ -65,6 +65,8 @@ func TestRunPipe(t *testing.T) {
 				Binary:     "mybin",
 				TagTemplates: []string{
 					"{{.Tag}}-{{.Env.FOO}}",
+					"v{{.Major}}",
+					"v{{.Major}}.{{.Minor}}",
 					"latest",
 				},
 				Files: []string{
@@ -73,6 +75,8 @@ func TestRunPipe(t *testing.T) {
 			},
 			expect: []string{
 				registry + "goreleaser/test_run_pipe:v1.0.0-123",
+				registry + "goreleaser/test_run_pipe:v1",
+				registry + "goreleaser/test_run_pipe:v1.0",
 				registry + "goreleaser/test_run_pipe:latest",
 			},
 			err: "",