Merge pull request #2355 from thaJeztah/fix_bind_panic

fix panic on single-character volumes

cli/compose/loader/volume.go

@@ -111,6 +111,9 @@ func isFilePath(source string) bool {
 	case '.', '/', '~':
 		return true
 	}
+	if len([]rune(source)) == 1 {
+		return false
+	}
 
 	// windows named pipes
 	if strings.HasPrefix(source, `\\`) {

cli/compose/loader/volume_test.go

@@ -162,6 +162,8 @@ func TestParseVolumeWindowsNamedPipe(t *testing.T) {
 
 func TestIsFilePath(t *testing.T) {
 	assert.Check(t, !isFilePath("a界"))
+	assert.Check(t, !isFilePath("1"))
+	assert.Check(t, !isFilePath("c"))
 }
 
 // Preserve the test cases for VolumeSplitN