feat: allow symlink

Signed-off-by: Batuhan Apaydın <batuhan.apaydin@trendyol.com>

pkg/commands/options/filestuff.go

@@ -86,17 +86,30 @@ func EnumerateFiles(fo *FilenameOptions) chan string {
 				// processing (unless we are in recursive mode).  If we decide to process
 				// the directory, and we're in watch mode, then we set up a watch on the
 				// directory.
+				symlink, err := ResolveSymlink(path, fi)
+				if err != nil {
+					return err
+				}
+
 				if fi.IsDir() {
 					if path != paths && !fo.Recursive {
 						return filepath.SkipDir
 					}
 					if watcher != nil {
-						watcher.Add(path)
+						watcher.Add(symlink)
+					} else {
+						if symlink != "" {
+							files <- symlink
+						}
 					}
 					// We don't stream back directories, we just decide to skip them, or not.
 					return nil
 				}
 
+				if symlink != "" {
+					files <- symlink
+				}
+
 				// Don't check extension if the filepath was passed explicitly
 				if path != paths {
 					switch filepath.Ext(path) {
@@ -142,3 +155,10 @@ func EnumerateFiles(fo *FilenameOptions) chan string {
 	}()
 	return files
 }
+
+func ResolveSymlink(path string, fi os.FileInfo) (symlink string, err error) {
+	if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
+		symlink, err = os.Readlink(path)
+	}
+	return
+}

pkg/commands/resolver.go

@@ -448,7 +448,25 @@ func resolveFile(
 	if f == "-" {
 		b, err = ioutil.ReadAll(os.Stdin)
 	} else {
-		b, err = ioutil.ReadFile(f)
+		fi, err := os.Lstat(f)
+		if err != nil {
+			return nil, fmt.Errorf("unable to find file %s selector: %wß", f, err)
+		}
+
+		symlink, err := options.ResolveSymlink(f, fi)
+		if err != nil {
+			return nil, fmt.Errorf("unable to resolve symlink of file %s selector: %w", f, err)
+		}
+
+		if symlink != "" {
+			b, err = ioutil.ReadFile(symlink)
+		} else {
+			b, err = ioutil.ReadFile(f)
+		}
+
+		if err != nil {
+			return nil, fmt.Errorf("unable to read file %s: %w", f, err)
+		}
 	}
 	if err != nil {
 		return nil, err

test/symlink.yaml

@@ -0,0 +1 @@
+test/test.yaml