Support full-tag prepared CI delivery

internal/preparation/preparation.go

@@ -16,23 +16,29 @@ import (
 
 type TaggedCheckoutRequest struct {
 	RepositoryDir  string
-	Version        string
+	Tag            string
 	Remote         string
 	ExpectedCommit string
+	VerifyOnly     bool
 }
 
 func PrepareTaggedCheckout(ctx context.Context, request TaggedCheckoutRequest) error {
-	if !versioncontract.ValidStableVersion(request.Version) {
-		return fmt.Errorf("%w: %q", candidate.ErrInvalidVersion, request.Version)
+	lastSlash := strings.LastIndex(request.Tag, "/")
+	version := request.Tag[lastSlash+1:]
+	if !versioncontract.ValidStableVersion(version) {
+		return fmt.Errorf("%w: tag %q must end in a stable semantic version", candidate.ErrInvalidVersion, request.Tag)
 	}
 	if strings.TrimSpace(request.ExpectedCommit) == "" {
 		return errors.New("expected commit is required")
 	}
+	if request.VerifyOnly {
+		return git.VerifyTaggedCheckout(ctx, request.RepositoryDir, request.Tag, request.ExpectedCommit)
+	}
 	remote := request.Remote
 	if remote == "" {
 		remote = "origin"
 	}
-	return git.PrepareTaggedCheckout(ctx, request.RepositoryDir, request.Version, remote, request.ExpectedCommit)
+	return git.PrepareTaggedCheckout(ctx, request.RepositoryDir, request.Tag, remote, request.ExpectedCommit)
 }
 
 func PrepareBuildDependencies(ctx context.Context, moduleDir string) error {