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