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//go:build linux || freebsd || darwin
// +build linux freebsd darwin
package directory // import "github.com/docker/docker/pkg/directory"
import (
"context"
"os"
"path/filepath"
"syscall"
)
// calcSize walks a directory tree and returns its total size in bytes.
func calcSize(ctx context.Context, dir string) (int64, error) {
var size int64
data := make(map[uint64]struct{})
err := filepath.Walk(dir, func(d string, fileInfo os.FileInfo, err error) error {
if err != nil {
// if dir/x disappeared while walking, Size() ignores dir/x.
// if dir does not exist, Size() returns the error.
if d != dir && os.IsNotExist(err) {
return nil
}
return err
}
select {
case <-ctx.Done():
return ctx.Err()
default:
}
// 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
//nolint:unconvert // inode is not an uint64 on all platforms.
if _, exists := data[uint64(inode)]; exists {
return nil
}
data[uint64(inode)] = struct{}{} //nolint:unconvert // inode is not an uint64 on all platforms.
size += s
return nil
})
return size, err
}
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