package main

import (

"encoding/json"

log "github.com/sirupsen/logrus"

"io"

"os"

"path/filepath"

"strconv"

)

type Chmod struct {

Path string `json:"path"`

Mode string `json:"mode"`

}

// AdaptFilesystemPermissions Adapts the file system permissions to the mode specified in the chmodInfoString parameter

// chmodInfoString should be a json encoded list of `Chmod` structs.

// example: '[{"path": "/opt", "mode": "0755"}]'. The mode string should be an octal representation of the targeted file mode.

func AdaptFilesystemPermissions(chmodInfoString string) error {

var chmodInfo []Chmod

err := json.Unmarshal([]byte(chmodInfoString), &chmodInfo)

if err != nil {

return err

}

for _, chmod := range chmodInfo {

mode, err := strconv.ParseInt(chmod.Mode, 0, 32)

if err != nil {

return err

}

if err := ChmodRecursively(chmod.Path, os.FileMode(mode)); err != nil {

log.Warnf("Could not change file mode recursively of directory %s: %s\n", chmod.Path, err)

}

}

return nil

}

// Inspired by https://stackoverflow.com/questions/73864379/golang-change-permission-os-chmod-and-os-chowm-recursively

// but using the more efficient WalkDir API

func ChmodRecursively(root string, mode os.FileMode) error {

return filepath.WalkDir(root,

func(path string, d os.DirEntry, err error) error {

if err != nil {

return err

}

err = os.Chmod(path, mode)

if err != nil {

return err

}

return nil

})

}

// Check if a directory is empty

// Source: https://stackoverflow.com/questions/30697324/how-to-check-if-directory-on-path-is-empty/30708914#30708914

func IsDirEmpty(name string) (bool, error) {

f, err := os.Open(name)

if err != nil {

return false, err

}

defer f.Close()

_, err = f.Readdirnames(1) // faster than f.Readdir(1)

if err == io.EOF {

return true, nil

}

return false, err // Either not empty or error, suits both cases

}