133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package fpath
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import (
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"fmt"
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"io"
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"os"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/zeebo/errs"
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)
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// IsRoot returns whether path is the root directory
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func IsRoot(path string) bool {
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abs, err := filepath.Abs(path)
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if err == nil {
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path = abs
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}
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return filepath.Dir(path) == path
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}
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// ApplicationDir returns best base directory for specific OS
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func ApplicationDir(subdir ...string) string {
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for i := range subdir {
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if runtime.GOOS == "windows" || runtime.GOOS == "darwin" {
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subdir[i] = strings.Title(subdir[i])
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} else {
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subdir[i] = strings.ToLower(subdir[i])
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}
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}
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var appdir string
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home := os.Getenv("HOME")
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switch runtime.GOOS {
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case "windows":
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// Windows standards: https://msdn.microsoft.com/en-us/library/windows/apps/hh465094.aspx?f=255&MSPPError=-2147217396
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for _, env := range []string{"AppData", "AppDataLocal", "UserProfile", "Home"} {
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val := os.Getenv(env)
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if val != "" {
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appdir = val
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break
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}
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}
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case "darwin":
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// Mac standards: https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/MacOSXDirectories/MacOSXDirectories.html
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appdir = filepath.Join(home, "Library", "Application Support")
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case "linux":
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fallthrough
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default:
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// Linux standards: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
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appdir = os.Getenv("XDG_DATA_HOME")
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if appdir == "" && home != "" {
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appdir = filepath.Join(home, ".local", "share")
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}
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}
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return filepath.Join(append([]string{appdir}, subdir...)...)
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}
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// IsValidSetupDir checks if directory is valid for setup configuration
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func IsValidSetupDir(name string) (ok bool, err error) {
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_, err = os.Stat(name)
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if err != nil {
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if os.IsNotExist(err) {
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return true, err
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}
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return false, err
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}
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f, err := os.Open(name)
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if err != nil {
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return false, err
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}
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defer func() {
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err = errs.Combine(err, f.Close())
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}()
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for {
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var filenames []string
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filenames, err = f.Readdirnames(100)
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if err == io.EOF {
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// nothing more
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return true, nil
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} else if err != nil {
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// something went wrong
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return false, err
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}
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for _, filename := range filenames {
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if filename == "config.yaml" {
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return false, nil
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}
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}
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}
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}
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// IsWritable determines if a directory is writeable
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func IsWritable(filepath string) (bool, error) {
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info, err := os.Stat(filepath)
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if err != nil {
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return false, err
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}
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if !info.IsDir() {
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return false, fmt.Errorf("Path %s is not a directory", filepath)
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}
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// Check if the user bit is enabled in file permission
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if info.Mode().Perm()&0200 == 0 {
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return false, fmt.Errorf("Write permission bit is not set on this file for user")
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}
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// Test if user can create file
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// There is no OS cross-compatible method for
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// determining if a user has write permissions on a folder.
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// We can test by attempting to create a file in the folder.
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testFile := path.Join(filepath, ".perm")
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file, err := os.Create(testFile) // For read access.
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if err != nil {
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return false, fmt.Errorf("Write permission bit is not set on this file for user")
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}
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_ = file.Close()
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_ = os.Remove(testFile)
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return true, nil
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}
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