Golang chmod files and directories recursively


I’m trying to use WalkDir with Chmod to recursively change the permission of a directory and its files and subdirectories. Somehow it does just change the first file or directory of the given path and stops afterwards. Can someone spot the mistake? getFileMode just converts the string "755" in os.FileMode(0755) and returns it.

func ChmodRec(path string, di fs.DirEntry, err error) error {
    fileMode, err2 := getFileMode(os.Getenv("CHMOD_MODE"))
    if err2 != nil {
        log.Fatal("Could not set file mode for chmodding", path)

    err2 = os.Chmod(path, fileMode)
    if err2 != nil {
        fmt.Println("Could not chmod", path)
    fmt.Println("Changing mode of", path)
    return nil

func ChmodRecursive(path string, mode string) {
    os.Setenv("CHMOD_MODE", mode)
    err := filepath.WalkDir(path, ChmodRec)
    if err != nil {
        log.Fatal("Could not chmod recursively ", path)

func main() {
    path := "bla/test/"
    mode := "755"
    ChmodRecursive(path, mode)


Your code does not check err argument in ChmodRec. This is an extract from official documentation:

WalkDir calls the function with a non-nil err argument in two cases.

First, if the initial fs.Stat on the root directory fails, WalkDir
calls the function with path set to root, d set to nil, and err set to
the error from fs.Stat.

Second, if a directory’s ReadDir method fails, WalkDir calls the
function with path set to the directory’s path, d set to an
fs.DirEntry describing the directory, and err set to the error from
ReadDir. In this second case, the function is called twice with the
path of the directory: the first call is before the directory read is
attempted and has err set to nil, giving the function a chance to
return SkipDir and avoid the ReadDir entirely. The second call is
after a failed ReadDir and reports the error from ReadDir. (If ReadDir
succeeds, there is no second call.)

Add this code to the beginning of the function. It can give you a hint:

func ChmodRec(path string, di fs.DirEntry, err error) error {
        if err != nil {

Answered By – Dmitry Harnitski

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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