| // Copyright 2021 Google LLC |
| // |
| // 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 |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // 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. |
| |
| package fs |
| |
| import ( |
| "compress/gzip" |
| "fmt" |
| "io" |
| "os" |
| |
| "github.com/GoogleCloudPlatform/cos-customizer/src/pkg/utils" |
| ) |
| |
| // GzipFile compresses the file at the input path and saves the result at the |
| // output path. |
| func GzipFile(inPath, outPath string) (err error) { |
| in, err := os.Open(inPath) |
| if err != nil { |
| return err |
| } |
| defer utils.CheckClose(in, fmt.Sprintf("error closing %q", inPath), &err) |
| out, err := os.Create(outPath) |
| if err != nil { |
| return err |
| } |
| defer utils.CheckClose(out, fmt.Sprintf("error closing %q", outPath), &err) |
| gzOut := gzip.NewWriter(out) |
| defer utils.CheckClose(gzOut, fmt.Sprintf("error closing gzip writer for %q", outPath), &err) |
| if _, err := io.Copy(gzOut, in); err != nil { |
| return fmt.Errorf("error gzipping %q to %q: %v", inPath, outPath, err) |
| } |
| return nil |
| } |