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55 lines
1.8 KiB
55 lines
1.8 KiB
//go:build windows
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/*
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Copyright The Helm Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package fileutil
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import (
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"io"
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"os"
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"github.com/gofrs/flock"
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)
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// PlatformAtomicWriteFile atomically writes a file to disk with file locking to
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// prevent concurrent writes. This is particularly useful on Windows where
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// concurrent writes to the same file can cause "Access Denied" errors.
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//
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// The function acquires a lock on the target file and performs an atomic write,
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// preserving the existing behaviour of overwriting any previous content once
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// the lock is obtained.
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func PlatformAtomicWriteFile(filename string, reader io.Reader, mode os.FileMode) error {
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// Use a separate lock file to coordinate access between processes
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// We cannot lock the target file directly as it would prevent the atomic rename
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lockFileName := filename + ".lock"
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fileLock := flock.New(lockFileName)
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// Lock() ensures serialized access - if another process is writing, this will wait
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if err := fileLock.Lock(); err != nil {
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return err
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}
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defer func() {
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fileLock.Unlock()
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// Clean up the lock file
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// Ignore errors as the file might not exist or be in use by another process
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os.Remove(lockFileName)
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}()
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// Perform the atomic write while holding the lock
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return AtomicWriteFile(filename, reader, mode)
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}
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