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//go:build !windows
package directory
import (
"errors"
"io/fs"
"path/filepath"
"syscall"
)
// Size walks a directory tree and returns its total size in bytes.
func Size(dir string) (size int64, err error) {
usage, err := Usage(dir)
if err != nil {
return 0, err
}
return usage.Size, nil
}
// Usage walks a directory tree and returns its total size in bytes and the number of inodes.
func Usage(dir string) (usage *DiskUsage, err error) {
usage = &DiskUsage{}
data := make(map[uint64]struct{})
err = filepath.WalkDir(dir, func(d string, entry fs.DirEntry, err error) error {
if err != nil {
// if dir does not exist, Usage() returns the error.
// if dir/x disappeared while walking, Usage() ignores dir/x.
if errors.Is(err, fs.ErrNotExist) && d != dir {
return nil
}
return err
}
fileInfo, err := entry.Info()
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
return nil
}
return err
}
// Check inode to only count the sizes of files with multiple hard links once.
inode := fileInfo.Sys().(*syscall.Stat_t).Ino
if _, exists := data[inode]; exists {
return nil
}
data[inode] = struct{}{}
// Ignore directory sizes
if entry.IsDir() {
return nil
}
usage.Size += fileInfo.Size()
return nil
})
// inode count is the number of unique inode numbers we saw
usage.InodeCount = int64(len(data))
return
}
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