internal/fs/rename.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !windows
package fs
import (
"os"
"syscall"
"github.com/pkg/errors"
)
// renameFallback attempts to determine the appropriate fallback to failed rename
// operation depending on the resulting error.
func renameFallback(err error, src, dst string) error {
// Rename may fail if src and dst are on different devices; fall back to
// copy if we detect that case. syscall.EXDEV is the common name for the
// cross device link error which has varying output text across different
// operating systems.
terr, ok := err.(*os.LinkError)
if !ok {
return err
} else if terr.Err != syscall.EXDEV {
return errors.Wrapf(terr, "link error: cannot rename %s to %s", src, dst)
}
return renameByCopy(src, dst)
}