feat: build.skip option, support for library projects (#1419)

* fix: checksum pipe will not return an error when artifact list is empty

Signed-off-by: Leonardo Grasso <me@leonardograsso.com>

* new: build.skip option for libraries

Signed-off-by: Leonardo Grasso <me@leonardograsso.com>

* docs: update doc with build.skip option

Signed-off-by: Leonardo Grasso <me@leonardograsso.com>

internal/pipe/build/build.go

@@ -32,6 +32,10 @@ func (Pipe) String() string {
 // Run the pipe
 func (Pipe) Run(ctx *context.Context) error {
 	for _, build := range ctx.Config.Builds {
+		if build.Skip {
+			log.WithField("id", build.ID).Info("skip is set")
+			continue
+		}
 		log.WithField("build", build).Debug("building")
 		if err := runPipeOnBuild(ctx, build); err != nil {
 			return err

internal/pipe/build/build_test.go

@@ -339,6 +339,23 @@ func TestDefaultFillSingleBuild(t *testing.T) {
 	assert.Equal(t, ctx.Config.Builds[0].Binary, "foo")
 }
 
+func TestSkipBuild(t *testing.T) {
+	folder, back := testlib.Mktmp(t)
+	defer back()
+	var config = config.Project{
+		Dist: folder,
+		Builds: []config.Build{
+			{
+				Skip: true,
+			},
+		},
+	}
+	var ctx = context.New(config)
+	ctx.Git.CurrentTag = "2.4.5"
+	assert.NoError(t, Pipe{}.Run(ctx))
+	assert.Len(t, ctx.Artifacts.List(), 0)
+}
+
 func TestExtWindows(t *testing.T) {
 	assert.Equal(t, ".exe", extFor("windows_amd64", config.FlagArray{}))
 	assert.Equal(t, ".exe", extFor("windows_386", config.FlagArray{}))

internal/pipe/checksums/checksums.go

@@ -35,6 +35,17 @@ func (Pipe) Default(ctx *context.Context) error {
 
 // Run the pipe
 func (Pipe) Run(ctx *context.Context) (err error) {
+	artifactList := ctx.Artifacts.Filter(
+		artifact.Or(
+			artifact.ByType(artifact.UploadableArchive),
+			artifact.ByType(artifact.UploadableBinary),
+			artifact.ByType(artifact.LinuxPackage),
+		),
+	).List()
+	if len(artifactList) == 0 {
+		return nil
+	}
+
 	filename, err := tmpl.New(ctx).Apply(ctx.Config.Checksum.NameTemplate)
 	if err != nil {
 		return err
@@ -50,13 +61,7 @@ func (Pipe) Run(ctx *context.Context) (err error) {
 	defer file.Close() // nolint: errcheck
 
 	var g = semerrgroup.New(ctx.Parallelism)
-	for _, artifact := range ctx.Artifacts.Filter(
-		artifact.Or(
-			artifact.ByType(artifact.UploadableArchive),
-			artifact.ByType(artifact.UploadableBinary),
-			artifact.ByType(artifact.LinuxPackage),
-		),
-	).List() {
+	for _, artifact := range artifactList {
 		artifact := artifact
 		g.Go(func() error {
 			return checksums(ctx.Config.Checksum.Algorithm, file, artifact)

internal/pipe/checksums/checksums_test.go

@@ -131,6 +131,12 @@ func TestPipeCouldNotOpenChecksumsTxt(t *testing.T) {
 	assert.Contains(t, err.Error(), "/checksums.txt: permission denied")
 }
 
+func TestPipeWhenNoArtifacts(t *testing.T) {
+	var ctx = &context.Context{}
+	assert.NoError(t, Pipe{}.Run(ctx))
+	assert.Len(t, ctx.Artifacts.List(), 0)
+}
+
 func TestDefault(t *testing.T) {
 	var ctx = &context.Context{
 		Config: config.Project{

pkg/config/config.go

@@ -156,6 +156,7 @@ type Build struct {
 	Lang     string         `yaml:",omitempty"`
 	Asmflags StringArray    `yaml:",omitempty"`
 	Gcflags  StringArray    `yaml:",omitempty"`
+	Skip     bool           `yaml:",omitempty"`
 }
 
 // FormatOverride is used to specify a custom format for a specific GOOS.

www/content/build.md

@@ -111,6 +111,11 @@ builds:
     hooks:
       pre: rice embed-go
       post: ./script.sh
+
+    # If true, skip the build.
+    # Useful for library projects.
+    # Default is false
+    skip: false
 ```
 
 > Learn more about the [name template engine](/templates).
@@ -154,4 +159,4 @@ GOVERSION=$(go version) goreleaser
 
 GoReleaser uses `git describe` to get the build tag. You can set
 a different build tag using the environment variable `GORELEASER_CURRENT_TAG`.
-This is useful in scenarios where two tags point to the same commit.
+This is useful in scenarios where two tags point to the same commit.