// fills tar.Header missing information (uid/gid, username/groupname, times ...)
func FillHeader(hdr *tar.Header) {
var cuname string
cuid := os.Getuid()
if curr, err := user.LookupId(fmt.Sprintf("%d", cuid)); err == nil {
cuname = curr.Username
}
if hdr.Uid == 0 {
if hdr.Uname == "" {
hdr.Uid = cuid
hdr.Uname = cuname
} else {
if usr, err := user.Lookup(hdr.Uname); err == nil {
if i, err := fmt.Sscanf("%d", usr.Uid); err == nil {
hdr.Uid = i
hdr.Uname = usr.Username
}
}
}
}
if hdr.Gid == 0 {
if hdr.Gname == "" {
if hdr.Uid != 0 {
if usr, err := user.LookupId(fmt.Sprintf("%d", hdr.Uid)); err == nil {
if i, err := fmt.Sscanf("%d", usr.Gid); err == nil {
hdr.Gid = i
}
}
}
}
}
if hdr.ModTime.IsZero() {
hdr.ModTime = time.Now()
}
if hdr.AccessTime.IsZero() {
hdr.AccessTime = hdr.ModTime
}
if hdr.ChangeTime.IsZero() {
hdr.ChangeTime = hdr.ModTime
}
}
func createArchive() int {
archive := tar.NewWriter(output)
defer archive.Close()
exit_value := 0
for _, f := range fileList {
err := filepath.Walk(f, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if verbose {
fmt.Fprintf(os.Stderr, "%s\n", path)
}
var hdr tar.Header
hdr.Name = path
hdr.Size = info.Size()
hdr.Mode = int64(info.Mode())
hdr.ModTime = info.ModTime()
// this is not portable:
hdr.Uid = int(info.Sys().(*syscall.Stat_t).Uid)
hdr.Gid = int(info.Sys().(*syscall.Stat_t).Gid)
if user, err := user.LookupId(fmt.Sprintf("%d", hdr.Uid)); err == nil {
hdr.Uname = user.Name
}
// TODO: lookup group, too.
switch info.Mode() & os.ModeType {
case 0:
hdr.Typeflag = tar.TypeReg
case os.ModeDir:
hdr.Typeflag = tar.TypeDir
case os.ModeSymlink:
hdr.Typeflag = tar.TypeSymlink
linkname, err := os.Readlink(path)
if err != nil {
fmt.Fprintf(os.Stderr, "Warning: can't readlink a symlink: %v\n", err)
return nil
} else {
hdr.Linkname = linkname
}
case os.ModeNamedPipe:
hdr.Typeflag = tar.TypeFifo
case os.ModeSocket:
fmt.Fprintf(os.Stderr, "Warning: can't tar a socket\n")
return nil
case os.ModeDevice:
fmt.Fprintf(os.Stderr, "Warning: device files are currently unsupported\n")
return nil
/*
if (info.Mode() & os.ModeCharDevice) != 0 {
os.Typeflag = tar.TypeChar
} else {
os.Typeflag = tar.TypeBlock
}
*/
}
if err := archive.WriteHeader(&hdr); err != nil {
fmt.Fprintf(os.Stderr, "Writing archive header for %s failed: %v\n", path, err)
exit_value = 1
return nil
}
defer archive.Flush()
if hdr.Typeflag == tar.TypeReg {
if f, err := os.Open(path); err != nil {
fmt.Fprintf(os.Stderr, "Opening file %s failed: %v\n", path, err)
exit_value = 1
return nil
} else {
io.Copy(archive, f)
f.Close()
}
}
return nil
})
if err != nil {
fmt.Fprintf(os.Stderr, "An error occured: %v\n", err)
exit_value = 1
}
}
return exit_value
}