mirror of
https://github.com/mudler/luet.git
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133 lines
2.9 KiB
Go
133 lines
2.9 KiB
Go
// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, see <http://www.gnu.org/licenses/>.
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package helpers
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import (
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"archive/tar"
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"io"
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"os"
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"path/filepath"
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"github.com/docker/docker/pkg/archive"
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)
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func Tar(src, dest string) error {
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out, err := os.Create(dest)
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if err != nil {
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return err
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}
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defer out.Close()
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fs, err := archive.Tar(src, archive.Uncompressed)
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if err != nil {
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return err
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}
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defer fs.Close()
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_, err = io.Copy(out, fs)
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if err != nil {
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return err
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}
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err = out.Sync()
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if err != nil {
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return err
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}
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return err
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}
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// Untar just a wrapper around the docker functions
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func Untar(src, dest string, sameOwner bool) error {
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var ans error
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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if sameOwner {
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// PRE: i have root privileged.
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opts := &archive.TarOptions{
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// NOTE: NoLchown boolean is used for chmod of the symlink
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// Probably it's needed set this always to true.
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NoLchown: true,
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ExcludePatterns: []string{"dev/"}, // prevent 'operation not permitted'
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}
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ans = archive.Untar(in, dest, opts)
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} else {
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var fileReader io.ReadCloser = in
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tr := tar.NewReader(fileReader)
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for {
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header, err := tr.Next()
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switch {
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case err == io.EOF:
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goto tarEof
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case err != nil:
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return err
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case header == nil:
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continue
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}
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// the target location where the dir/file should be created
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target := filepath.Join(dest, header.Name)
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// Check the file type
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switch header.Typeflag {
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// if its a dir and it doesn't exist create it
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case tar.TypeDir:
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if _, err := os.Stat(target); err != nil {
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if err := os.MkdirAll(target, 0755); err != nil {
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return err
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}
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}
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// handle creation of file
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case tar.TypeReg:
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f, err := os.OpenFile(target, os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode))
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if err != nil {
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return err
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}
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// copy over contents
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if _, err := io.Copy(f, tr); err != nil {
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return err
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}
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// manually close here after each file operation; defering would cause each
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// file close to wait until all operations have completed.
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f.Close()
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case tar.TypeSymlink:
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source := header.Linkname
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err := os.Symlink(source, target)
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if err != nil {
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return err
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}
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}
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}
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tarEof:
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}
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return ans
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}
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