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Refactor utils package to not dump everything unrelated into one file (…
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,80 @@ | ||
| // Copyright 2024 Google LLC | ||
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| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
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| // https://www.apache.org/licenses/LICENSE-2.0 | ||
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| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| // OS file util for Google Guest Agent and Google Authorized Keys. | ||
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| package utils | ||
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| import ( | ||
| "fmt" | ||
| "io/fs" | ||
| "os" | ||
| "path/filepath" | ||
| ) | ||
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| // SaferWriteFile writes to a temporary file and then replaces the expected output file. | ||
| // This prevents other processes from reading partial content while the writer is still writing. | ||
| func SaferWriteFile(content []byte, outputFile string, perm fs.FileMode) error { | ||
| dir := filepath.Dir(outputFile) | ||
| name := filepath.Base(outputFile) | ||
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| if err := os.MkdirAll(dir, perm); err != nil { | ||
| return fmt.Errorf("unable to create required directories %q: %w", dir, err) | ||
| } | ||
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| tmp, err := os.CreateTemp(dir, name+"*") | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create temporary file under %q: %w", dir, err) | ||
| } | ||
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| if err := os.Chmod(tmp.Name(), perm); err != nil { | ||
| return fmt.Errorf("unable to set permissions on temporary file %q: %w", dir, err) | ||
| } | ||
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| if err := tmp.Close(); err != nil { | ||
| return fmt.Errorf("failed to close temporary file: %w", err) | ||
| } | ||
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| if err := WriteFile(content, tmp.Name(), perm); err != nil { | ||
| return fmt.Errorf("unable to write to a temporary file %q: %w", tmp.Name(), err) | ||
| } | ||
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| return os.Rename(tmp.Name(), outputFile) | ||
| } | ||
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| // CopyFile copies content from src to dst and sets permissions. | ||
| func CopyFile(src, dst string, perm fs.FileMode) error { | ||
| b, err := os.ReadFile(src) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to read %q: %w", src, err) | ||
| } | ||
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| if err := WriteFile(b, dst, perm); err != nil { | ||
| return fmt.Errorf("failed to write %q: %w", dst, err) | ||
| } | ||
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| if err := os.Chmod(dst, perm); err != nil { | ||
| return fmt.Errorf("unable to set permissions on destination file %q: %w", dst, err) | ||
| } | ||
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| return nil | ||
| } | ||
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| // WriteFile creates parent directories if required and writes content to the output file. | ||
| func WriteFile(content []byte, outputFile string, perm fs.FileMode) error { | ||
| if err := os.MkdirAll(filepath.Dir(outputFile), perm); err != nil { | ||
| return fmt.Errorf("unable to create required directories for %q: %w", outputFile, err) | ||
| } | ||
| return os.WriteFile(outputFile, content, perm) | ||
| } |
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