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moby--moby/utils/utils_daemon.go

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// +build daemon
package utils
import (
"os"
"path/filepath"
"syscall"
)
// TreeSize walks a directory tree and returns its total size in bytes.
func TreeSize(dir string) (size int64, err error) {
data := make(map[uint64]struct{})
err = filepath.Walk(dir, func(d string, fileInfo os.FileInfo, e error) error {
// Ignore directory sizes
if fileInfo == nil {
return nil
}
s := fileInfo.Size()
if fileInfo.IsDir() || s == 0 {
return nil
}
// Check inode to handle hard links correctly
inode := fileInfo.Sys().(*syscall.Stat_t).Ino
// inode is not a uint64 on all platforms. Cast it to avoid issues.
if _, exists := data[uint64(inode)]; exists {
return nil
}
// inode is not a uint64 on all platforms. Cast it to avoid issues.
data[uint64(inode)] = struct{}{}
size += s
return nil
})
return
}
// IsFileOwner checks whether the current user is the owner of the given file.
func IsFileOwner(f string) bool {
if fileInfo, err := os.Stat(f); err == nil && fileInfo != nil {
if stat, ok := fileInfo.Sys().(*syscall.Stat_t); ok && int(stat.Uid) == os.Getuid() {
return true
}
}
return false
}