Pkg: Add fs.Exists() function to check for any existing file/dir/link

Signed-off-by: Michael Mayer <michael@photoprism.app>

pkg/fs/fs.go

@@ -67,13 +67,25 @@ func SocketExists(socketName string) bool {
 	return true
 }
 
-// FileExists returns true if specified file exists and is not a directory.
-func FileExists(fileName string) bool {
-	if fileName == "" {
+// Exists returns true if the specified file system path exists,
+// regardless of whether it is a file, directory, or link.
+func Exists(fsPath string) bool {
+	if fsPath == "" {
 		return false
 	}
 
-	info, err := os.Stat(fileName)
+	_, err := os.Stat(fsPath)
+
+	return err == nil
+}
+
+// FileExists returns true if a file exists at the specified path.
+func FileExists(filePath string) bool {
+	if filePath == "" {
+		return false
+	}
+
+	info, err := os.Stat(filePath)
 
 	return err == nil && !info.IsDir()
 }

pkg/fs/fs_test.go

@@ -21,7 +21,19 @@ func TestMain(m *testing.M) {
 	os.Exit(code)
 }
 
+func TestExists(t *testing.T) {
+	assert.True(t, Exists("./testdata"))
+	assert.True(t, Exists("./testdata/"))
+	assert.True(t, Exists("./testdata/test.jpg"))
+	assert.True(t, Exists("./testdata/test.jpg"))
+	assert.True(t, Exists("./testdata/empty.jpg"))
+	assert.False(t, Exists("./foo.jpg"))
+	assert.False(t, Exists(""))
+}
+
 func TestFileExists(t *testing.T) {
+	assert.False(t, FileExists("./testdata"))
+	assert.False(t, FileExists("./testdata/"))
 	assert.True(t, FileExists("./testdata/test.jpg"))
 	assert.True(t, FileExists("./testdata/test.jpg"))
 	assert.True(t, FileExists("./testdata/empty.jpg"))