fix: always include files from the same workspace as the build target…

… in `copy_to_directory`

Fixes bazel-contrib#359.

This updates the `copy_to_directory` tool to accept a workspace name representing the workspace of the target it is executing under. Any files in this workspace are automatically included, regardless of the `include_external_repositories` option. This makes it support usage within an external target (such as `@wksp//:dir`).

lib/private/copy_to_directory.bzl

@@ -836,7 +836,7 @@ def copy_to_directory_bin_action(
         inputs = file_inputs + [config_file],
         outputs = [dst],
         executable = copy_to_directory_bin,
-        arguments = [config_file.path],
+        arguments = [config_file.path, ctx.label.workspace_name],
         mnemonic = "CopyToDirectory",
         progress_message = "Copying files to directory %s" % _progress_path(dst),
         execution_requirements = _COPY_EXECUTION_REQUIREMENTS,

tools/copy_to_directory/main.go

@@ -44,6 +44,7 @@ type config struct {
 	Verbose                     bool              `json:"verbose"`
 
 	ReplacePrefixesKeys []string
+	TargetWorkspace string
 }
 
 type copyMap map[string]fileInfo
@@ -52,7 +53,7 @@ type pathSet map[string]bool
 var copySet = copyMap{}
 var mkdirSet = pathSet{}
 
-func parseConfig(configPath string) (*config, error) {
+func parseConfig(configPath string, wkspName string) (*config, error) {
 	f, err := os.Open(configPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open config file: %w", err)
@@ -70,6 +71,7 @@ func parseConfig(configPath string) (*config, error) {
 	}
 
 	cfg.ReplacePrefixesKeys = maps.Keys(cfg.ReplacePrefixes)
+	cfg.TargetWorkspace = wkspName
 
 	return &cfg, nil
 }
@@ -230,7 +232,9 @@ func (w *walker) copyPath(cfg *config, file fileInfo) error {
 	outputRoot := path.Dir(outputPath)
 
 	// apply include_external_repositories (if the file is from an external repository)
-	if file.Workspace != "" {
+	// automatically include files from the same workspace as this target, even if
+	// that is an external workspace with respect to `__main__`
+	if file.Workspace != "" && file.Workspace != cfg.TargetWorkspace {
 		match, err := anyGlobsMatch(cfg.IncludeExternalRepositories, file.Workspace)
 		if err != nil {
 			return err
@@ -376,12 +380,13 @@ func main() {
 		}
 	}
 
-	if len(args) != 1 {
-		fmt.Println("Usage: copy_to_directory config_file")
+	if len(args) != 2 {
+		fmt.Println("Usage: copy_to_directory config_file workspace_name")
 		os.Exit(1)
 	}
 
-	cfg, err := parseConfig(args[0])
+	wksp := args[1]
+	cfg, err := parseConfig(args[0], wksp)
 	if err != nil {
 		log.Fatal(err)
 	}