84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
/*
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Copyright 2019 The Kubernetes 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 main
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import (
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"archive/tar"
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"compress/gzip"
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"io"
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"os"
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"path/filepath"
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"strings"
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"github.com/pkg/errors"
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)
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// tarDir takes a source and variable writers and walks 'source' writing each file
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// found to the tar writer.
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func tarDir(dir, outpath string) error {
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// ensure the src actually exists before trying to tar it
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if _, err := os.Stat(dir); err != nil {
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return errors.Wrapf(err, "tar unable to stat directory %v", dir)
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}
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outfile, err := os.Create(outpath)
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if err != nil {
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return errors.Wrapf(err, "creating tarball %v", outpath)
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}
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defer outfile.Close()
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gzw := gzip.NewWriter(outfile)
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defer gzw.Close()
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tw := tar.NewWriter(gzw)
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defer tw.Close()
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return filepath.Walk(dir, func(file string, fi os.FileInfo, err error) error {
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// Return on any error.
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if err != nil {
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return err
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}
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// Only write regular files and don't include the archive itself.
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if !fi.Mode().IsRegular() || filepath.Join(dir, fi.Name()) == outpath {
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return nil
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}
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// Create a new dir/file header.
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header, err := tar.FileInfoHeader(fi, fi.Name())
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if err != nil {
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return errors.Wrapf(err, "creating file info header %v", fi.Name())
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}
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// Update the name to correctly reflect the desired destination when untaring.
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header.Name = strings.TrimPrefix(strings.Replace(file, dir, "", -1), string(filepath.Separator))
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if err := tw.WriteHeader(header); err != nil {
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return errors.Wrapf(err, "writing header for tarball %v", header.Name)
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}
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// Open files, copy into tarfile, and close.
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f, err := os.Open(file)
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if err != nil {
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return errors.Wrapf(err, "opening file %v for writing into tarball", file)
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}
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defer f.Close()
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_, err = io.Copy(tw, f)
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return errors.Wrapf(err, "creating file %v contents into tarball", file)
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})
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}
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