| // Copyright Istio Authors |
| // |
| // 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 tgz |
| |
| import ( |
| "archive/tar" |
| "compress/gzip" |
| "fmt" |
| "io" |
| "os" |
| "path" |
| "path/filepath" |
| "strings" |
| ) |
| |
| // Create creates a gzipped tar file from srcDir and writes it to outPath. |
| func Create(srcDir, outPath string) error { |
| mw, err := os.Create(outPath) |
| if err != nil { |
| return err |
| } |
| |
| gzw := gzip.NewWriter(mw) |
| defer gzw.Close() |
| |
| tw := tar.NewWriter(gzw) |
| defer tw.Close() |
| |
| return filepath.Walk(srcDir, func(file string, fi os.FileInfo, err error) error { |
| if err != nil { |
| return err |
| } |
| if !fi.Mode().IsRegular() { |
| return nil |
| } |
| header, err := tar.FileInfoHeader(fi, fi.Name()) |
| if err != nil { |
| return err |
| } |
| header.Name = strings.TrimPrefix(strings.Replace(file, srcDir, "", -1), string(filepath.Separator)) |
| if err := tw.WriteHeader(header); err != nil { |
| return err |
| } |
| |
| f, err := os.Open(file) |
| if err != nil { |
| return err |
| } |
| defer f.Close() |
| |
| if _, err := io.Copy(tw, f); err != nil { |
| return err |
| } |
| return nil |
| }) |
| } |
| |
| func Extract(gzipStream io.Reader, destination string) error { |
| uncompressedStream, err := gzip.NewReader(gzipStream) |
| if err != nil { |
| return fmt.Errorf("create gzip reader: %v", err) |
| } |
| |
| tarReader := tar.NewReader(uncompressedStream) |
| |
| for { |
| header, err := tarReader.Next() |
| if err == io.EOF { |
| break |
| } |
| if err != nil { |
| return fmt.Errorf("next: %v", err) |
| } |
| |
| dest := filepath.Join(destination, header.Name) |
| switch header.Typeflag { |
| case tar.TypeDir: |
| if _, err := os.Stat(dest); err != nil { |
| if err := os.Mkdir(dest, 0o755); err != nil { |
| return fmt.Errorf("mkdir: %v", err) |
| } |
| } |
| case tar.TypeReg: |
| // Create containing folder if not present |
| dir := path.Dir(dest) |
| if _, err := os.Stat(dir); err != nil { |
| if err := os.MkdirAll(dir, 0o755); err != nil { |
| return err |
| } |
| } |
| outFile, err := os.Create(dest) |
| if err != nil { |
| return fmt.Errorf("create: %v", err) |
| } |
| if _, err := io.Copy(outFile, tarReader); err != nil { |
| return fmt.Errorf("copy: %v", err) |
| } |
| outFile.Close() |
| default: |
| return fmt.Errorf("uknown type: %v in %v", header.Typeflag, header.Name) |
| } |
| } |
| return nil |
| } |