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52 lines
1.3 KiB
52 lines
1.3 KiB
/*
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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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"io/ioutil"
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"os"
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"path/filepath"
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"helm.sh/helm/v3/internal/third_party/dep/fs"
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)
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// AtomicWriteFile atomically (as atomic as os.Rename allows) writes a file to a
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// disk.
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func AtomicWriteFile(filename string, reader io.Reader, mode os.FileMode) error {
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tempFile, err := ioutil.TempFile(filepath.Split(filename))
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if err != nil {
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return err
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}
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tempName := tempFile.Name()
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if _, err := io.Copy(tempFile, reader); err != nil {
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tempFile.Close() // return value is ignored as we are already on error path
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return err
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}
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if err := tempFile.Close(); err != nil {
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return err
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}
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if err := os.Chmod(tempName, mode); err != nil {
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return err
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}
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return fs.RenameWithFallback(tempName, filename)
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}
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