// tarCreate creates a tarfile for a clickdeb, all files in the archive
// belong to root (same as dpkg-deb)
func tarCreate(tarname string, sourceDir string, fn tarExcludeFunc) error {
w, err := os.Create(tarname)
if err != nil {
return err
}
defer w.Close()
var compressor io.WriteCloser
switch {
case strings.HasSuffix(tarname, ".gz"):
compressor, err = gzip.NewWriterLevel(w, 9)
case strings.HasSuffix(tarname, ".xz"):
compressor = newXZPipeWriter(w)
default:
return fmt.Errorf("unknown compression extension %s", tarname)
}
if err != nil {
return err
}
defer compressor.Close()
tarWriter := tar.NewWriter(compressor)
defer tarWriter.Close()
err = filepath.Walk(sourceDir, func(path string, info os.FileInfo, err error) error {
st, err := os.Lstat(path)
if err != nil {
return err
}
// check if we support this type
if !st.Mode().IsRegular() && !helpers.IsSymlink(st.Mode()) && !st.Mode().IsDir() && !helpers.IsDevice(st.Mode()) {
return fmt.Errorf("unsupported file type for %s", path)
}
// check our exclude function
if fn != nil {
if !fn(path) {
return nil
}
}
// huh? golang, come on! the symlink stuff is a bit complicated
target, _ := os.Readlink(path)
hdr, err := tar.FileInfoHeader(info, target)
if err != nil {
return err
}
// tar.FileInfoHeader does include the fact that its a
// char/block device, but does not set major/minor :/
if helpers.IsDevice(st.Mode()) {
major, minor, err := helpers.MajorMinor(st)
if err != nil {
return err
}
hdr.Devmajor = int64(major)
hdr.Devminor = int64(minor)
}
// exclude "."
relativePath := "." + path[len(sourceDir):]
if relativePath == "." {
return nil
}
// add header, note that all files belong to root
hdr.Name = relativePath
hdr.Uid = 0
hdr.Gid = 0
hdr.Uname = "root"
hdr.Gname = "root"
if err := tarWriter.WriteHeader(hdr); err != nil {
return err
}
// add content
if st.Mode().IsRegular() {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(tarWriter, f)
if err != nil {
return err
}
}
return nil
})
return err
}
func copyToBuildDir(sourceDir, buildDir string) error {
sourceDir, err := filepath.Abs(sourceDir)
if err != nil {
return err
}
err = os.Remove(buildDir)
if err != nil && !os.IsNotExist(err) {
// this shouldn't happen, but.
return err
}
// no umask here so that we get the permissions correct
oldUmask := syscall.Umask(0)
defer syscall.Umask(oldUmask)
return filepath.Walk(sourceDir, func(path string, info os.FileInfo, errin error) (err error) {
if errin != nil {
return errin
}
relpath := path[len(sourceDir):]
if relpath == "/DEBIAN" || shouldExclude(sourceDir, filepath.Base(path)) {
if info.IsDir() {
return filepath.SkipDir
}
return nil
}
dest := filepath.Join(buildDir, relpath)
// handle dirs
if info.IsDir() {
return os.Mkdir(dest, info.Mode())
}
// handle char/block devices
if helpers.IsDevice(info.Mode()) {
return helpers.CopySpecialFile(path, dest)
}
if (info.Mode() & os.ModeSymlink) != 0 {
target, err := os.Readlink(path)
if err != nil {
return err
}
return os.Symlink(target, dest)
}
// fail if its unsupported
if !info.Mode().IsRegular() {
return fmt.Errorf("can not handle type of file %s", path)
}
// it's a file. Maybe we can link it?
if os.Link(path, dest) == nil {
// whee
return nil
}
// sigh. ok, copy it is.
return helpers.CopyFile(path, dest, helpers.CopyFlagDefault)
})
}