feat: support chaos commits on deploy

See coop-cloud/organising#517

pkg/recipe/git.go

@@ -57,21 +57,23 @@ func (r Recipe) EnsureExists() error {
 }
 
 // EnsureVersion checks whether a specific version exists for a recipe.
-func (r Recipe) EnsureVersion(version string) error {
+func (r Recipe) EnsureVersion(version string) (bool, error) {
+	isChaosCommit := false
+
 	recipeDir := path.Join(config.RECIPES_DIR, r.Name)
 
 	if err := gitPkg.EnsureGitRepo(recipeDir); err != nil {
-		return err
+		return isChaosCommit, err
 	}
 
 	repo, err := git.PlainOpen(recipeDir)
 	if err != nil {
-		return err
+		return isChaosCommit, err
 	}
 
 	tags, err := repo.Tags()
 	if err != nil {
-		return nil
+		return isChaosCommit, err
 	}
 
 	var parsedTags []string
@@ -83,7 +85,7 @@ func (r Recipe) EnsureVersion(version string) error {
 		}
 		return nil
 	}); err != nil {
-		return err
+		return isChaosCommit, err
 	}
 
 	joinedTags := strings.Join(parsedTags, ", ")
@@ -91,27 +93,33 @@ func (r Recipe) EnsureVersion(version string) error {
 		log.Debugf("read %s as tags for recipe %s", joinedTags, r.Name)
 	}
 
+	var opts *git.CheckoutOptions
 	if tagRef.String() == "" {
-		return fmt.Errorf("the local copy of %s doesn't seem to have version %s available?", r.Name, version)
+		log.Debugf("attempting to checkout '%s' as chaos commit", version)
+
+		hash, err := repo.ResolveRevision(plumbing.Revision(version))
+		if err != nil {
+			log.Fatalf("unable to resolve '%s': %s", version, err)
+		}
+
+		opts = &git.CheckoutOptions{Hash: *hash, Create: false, Force: true}
+		isChaosCommit = true
+	} else {
+		opts = &git.CheckoutOptions{Branch: tagRef, Create: false, Force: true}
 	}
 
 	worktree, err := repo.Worktree()
 	if err != nil {
-		return err
+		return isChaosCommit, nil
 	}
 
-	opts := &git.CheckoutOptions{
-		Branch: tagRef,
-		Create: false,
-		Force:  true,
-	}
 	if err := worktree.Checkout(opts); err != nil {
-		return err
+		return isChaosCommit, nil
 	}
 
 	log.Debugf("successfully checked %s out to %s in %s", r.Name, tagRef.Short(), recipeDir)
 
-	return nil
+	return isChaosCommit, nil
 }
 
 // EnsureIsClean makes sure that the recipe repository has no unstaged changes.