/usr/share/gocode/src/github.com/constabulary/gb/internal/untar/untar.go is in golang-github-constabulary-gb-dev 0.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | package untar
import (
"archive/tar"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/pkg/errors"
)
// Untar extracts the contents of r to the destination dest.
// dest must not aleady exist.
func Untar(dest string, r io.Reader) error {
if exists(dest) {
return errors.Errorf("%q must not exist", dest)
}
parent, _ := filepath.Split(dest)
tmpdir, err := ioutil.TempDir(parent, ".untar")
if err != nil {
return err
}
if err := untar(tmpdir, r); err != nil {
os.RemoveAll(tmpdir)
return err
}
if err := os.Rename(tmpdir, dest); err != nil {
os.RemoveAll(tmpdir)
return err
}
return nil
}
func untar(dest string, r io.Reader) error {
tr := tar.NewReader(r)
for {
h, err := tr.Next()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
if err := untarfile(dest, h, tr); err != nil {
return err
}
}
}
func untarfile(dest string, h *tar.Header, r io.Reader) error {
path := filepath.Join(dest, h.Name)
switch h.Typeflag {
case tar.TypeDir:
return os.Mkdir(path, os.FileMode(h.Mode))
case tar.TypeReg:
return writefile(path, r, os.FileMode(h.Mode))
case tar.TypeXGlobalHeader:
// ignore PAX headers
return nil
case tar.TypeSymlink:
// symlinks are not supported by the go tool or windows so
// cannot be part of a valie package. Any symlinks in the tarball
// will be in parts of the release that we can safely ignore.
return nil
default:
return errors.Errorf("unsupported header type: %c", rune(h.Typeflag))
}
}
func writefile(path string, r io.Reader, mode os.FileMode) error {
dir, _ := filepath.Split(path)
if err := os.MkdirAll(dir, mode); err != nil {
return errors.Wrap(err, "mkdirall failed")
}
w, err := os.Create(path)
if err != nil {
return errors.Wrap(err, "could not create destination")
}
if _, err := io.Copy(w, r); err != nil {
w.Close()
return err
}
return w.Close()
}
func exists(path string) bool {
_, err := os.Stat(path)
return err == nil || !os.IsNotExist(err)
}
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