92 lines
1.8 KiB
Go
92 lines
1.8 KiB
Go
package utils
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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)
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// TreeSize walks a directory tree and returns its total size in bytes.
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func TreeSize(dir string) (size int64, err error) {
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data := make(map[uint64]bool)
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err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, e error) error {
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// Ignore directory sizes
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if fileInfo == nil {
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return nil
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}
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s := fileInfo.Size()
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if fileInfo.IsDir() || s == 0 {
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return nil
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}
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// Check inode to handle hard links correctly
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inode := fileInfo.Sys().(*syscall.Stat_t).Ino
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if _, exists := data[inode]; exists {
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return nil
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}
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data[inode] = false
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size += s
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return nil
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})
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return
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}
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// FollowSymlink will follow an existing link and scope it to the root
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// path provided.
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func FollowSymlinkInScope(link, root string) (string, error) {
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prev := "/"
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root, err := filepath.Abs(root)
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if err != nil {
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return "", err
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}
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link, err = filepath.Abs(link)
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if err != nil {
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return "", err
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}
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if !strings.HasPrefix(filepath.Dir(link), root) {
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return "", fmt.Errorf("%s is not within %s", link, root)
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}
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for _, p := range strings.Split(link, "/") {
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prev = filepath.Join(prev, p)
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prev = filepath.Clean(prev)
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for {
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stat, err := os.Lstat(prev)
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if err != nil {
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if os.IsNotExist(err) {
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break
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}
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return "", err
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}
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if stat.Mode()&os.ModeSymlink == os.ModeSymlink {
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dest, err := os.Readlink(prev)
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if err != nil {
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return "", err
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}
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switch dest[0] {
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case '/':
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prev = filepath.Join(root, dest)
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case '.':
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prev, _ = filepath.Abs(prev)
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if prev = filepath.Clean(filepath.Join(filepath.Dir(prev), dest)); len(prev) < len(root) {
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prev = filepath.Join(root, filepath.Base(dest))
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}
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}
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} else {
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break
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}
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}
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}
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return prev, nil
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}
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