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af4f82228c
Windows requires this lock to be released before the directory is renamed. But on unix-like operating systems, releasing the lock and trying to reacquire it immediately can be flaky if a process is forked around the same time. The file descriptors are marked as close-on-exec by the Go runtime, but there is a window between the fork and exec where another process will be holding the lock.
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package wal
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import (
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"os"
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"github.com/coreos/etcd/wal/walpb"
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)
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func (w *WAL) renameWal(tmpdirpath string) (*WAL, error) {
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// rename of directory with locked files doesn't work on
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// windows; close the WAL to release the locks so the directory
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// can be renamed
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w.Close()
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if err := os.Rename(tmpdirpath, w.dir); err != nil {
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return nil, err
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}
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// reopen and relock
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newWAL, oerr := Open(w.dir, walpb.Snapshot{})
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if oerr != nil {
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return nil, oerr
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}
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if _, _, _, err := newWAL.ReadAll(); err != nil {
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newWAL.Close()
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return nil, err
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}
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return newWAL, nil
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}
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