79 lines
1.8 KiB
Go
79 lines
1.8 KiB
Go
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// Copyright 2015 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"archive/tar"
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"compress/gzip"
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"fmt"
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"os"
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)
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const filePerm = 0644
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type archiver interface {
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write(filename string, b []byte) error
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close() error
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filename() string
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}
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type tarGzFileWriter struct {
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tarWriter *tar.Writer
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gzWriter *gzip.Writer
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file *os.File
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}
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func newTarGzFileWriter(archiveName string) (*tarGzFileWriter, error) {
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file, err := os.Create(archiveName)
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if err != nil {
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return nil, fmt.Errorf("error creating archive %q: %s", archiveName, err)
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}
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gzw := gzip.NewWriter(file)
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tw := tar.NewWriter(gzw)
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return &tarGzFileWriter{
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tarWriter: tw,
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gzWriter: gzw,
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file: file,
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}, nil
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}
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func (w *tarGzFileWriter) close() error {
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if err := w.tarWriter.Close(); err != nil {
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return err
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}
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if err := w.gzWriter.Close(); err != nil {
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return err
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}
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return w.file.Close()
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}
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func (w *tarGzFileWriter) write(filename string, b []byte) error {
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header := &tar.Header{
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Name: filename,
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Mode: filePerm,
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Size: int64(len(b)),
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}
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if err := w.tarWriter.WriteHeader(header); err != nil {
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return err
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}
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if _, err := w.tarWriter.Write(b); err != nil {
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return err
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}
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return nil
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}
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func (w *tarGzFileWriter) filename() string {
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return w.file.Name()
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}
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