Switch to repository root on local preview. (#16)

* Switch to repository root on local preview.

* Fix copy

internal/cmd/stack/flags.go

@@ -13,6 +13,12 @@ var flagCommitSHA = &cli.StringFlag{
 	Usage: "Commit SHA for the newly created run",
 }
 
+var flagNoFindRepositoryRoot = &cli.BoolFlag{
+	Name:  "no-find-repository-root",
+	Usage: "Indicate whether spacectl should avoid finding the repository root (containing a .git directory) before packaging it.",
+	Value: false,
+}
+
 var flagRequiredCommitSHA = &cli.StringFlag{
 	Name:  "sha",
 	Usage: "SHA of the commit to set as canonical for the stack",

internal/cmd/stack/local_preview.go

@@ -20,6 +20,12 @@ func localPreview() cli.ActionFunc {
 	return func(cliCtx *cli.Context) error {
 		ctx := context.Background()
 
+		if !cliCtx.Bool(flagNoFindRepositoryRoot.Name) {
+			if err := moveToRepositoryRoot(); err != nil {
+				return fmt.Errorf("couldn't move to repository root: %w", err)
+			}
+		}
+
 		fmt.Println("Uploading local workspace...")
 
 		var uploadMutation struct {
@@ -97,6 +103,39 @@ func localPreview() cli.ActionFunc {
 	}
 }
 
+func moveToRepositoryRoot() error {
+	startCwd, err := os.Getwd()
+	if err != nil {
+		return fmt.Errorf("couldn't get current working directory: %w", err)
+	}
+	for {
+		if _, err := os.Stat(".git"); err == nil {
+			return nil
+		} else if !os.IsNotExist(err) {
+			return fmt.Errorf("couldn't stat .git directory: %w", err)
+		}
+
+		cwd, err := os.Getwd()
+		if err != nil {
+			return fmt.Errorf("couldn't get current working directory: %w", err)
+		}
+
+		parent := filepath.Dir(cwd)
+
+		if parent == cwd {
+			fmt.Println("Couldn't find repository root, using current directory.")
+			if err := os.Chdir(startCwd); err != nil {
+				return fmt.Errorf("couldn't set current working directory: %w", err)
+			}
+			return nil
+		}
+
+		if err := os.Chdir(parent); err != nil {
+			return fmt.Errorf("couldn't set current working directory: %w", err)
+		}
+	}
+}
+
 func getIgnoreMatcherFn(ctx context.Context) (func(filePath string) bool, error) {
 	gitignore, err := ignore.CompileIgnoreFile(".gitignore")
 	if err != nil && !os.IsNotExist(err) {

internal/cmd/stack/stack.go

@@ -42,8 +42,9 @@ func Command() *cli.Command {
 			{
 				Category: "Run local preview",
 				Name:     "local-preview",
-				Usage:    "Start a preview (proposed run) based on the current directory. Respects .gitignore and .terraformignore.",
+				Usage:    "Start a preview (proposed run) based on the current project. Respects .gitignore and .terraformignore.",
 				Flags: []cli.Flag{
+					flagNoFindRepositoryRoot,
 					flagRunMetadata,
 					flagNoTail,
 				},