go-mtree/keywords_linux.go

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// +build linux
package mtree
import (
"archive/tar"
"encoding/base64"
"fmt"
"io"
"os"
"os/user"
"strings"
"syscall"
"github.com/vbatts/go-mtree/xattr"
)
var (
// this is bsd specific https://www.freebsd.org/cgi/man.cgi?query=chflags&sektion=2
flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
return "", nil
}
unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return fmt.Sprintf("uname=%s", hdr.Uname), nil
}
stat := info.Sys().(*syscall.Stat_t)
u, err := user.LookupId(fmt.Sprintf("%d", stat.Uid))
if err != nil {
return "", err
}
return fmt.Sprintf("uname=%s", u.Username), nil
}
uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return fmt.Sprintf("uid=%d", hdr.Uid), nil
}
stat := info.Sys().(*syscall.Stat_t)
return fmt.Sprintf("uid=%d", stat.Uid), nil
}
gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return fmt.Sprintf("gid=%d", hdr.Gid), nil
}
if stat, ok := info.Sys().(*syscall.Stat_t); ok {
return fmt.Sprintf("gid=%d", stat.Gid), nil
}
return "", nil
}
nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
if stat, ok := info.Sys().(*syscall.Stat_t); ok {
return fmt.Sprintf("nlink=%d", stat.Nlink), nil
}
return "", nil
}
xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
if len(hdr.Xattrs) == 0 {
return "", nil
}
klist := []string{}
for k, v := range hdr.Xattrs {
klist = append(klist, fmt.Sprintf("xattr.%s=%s", k, base64.StdEncoding.EncodeToString([]byte(v))))
}
return strings.Join(klist, " "), nil
}
if !info.Mode().IsRegular() && !info.Mode().IsDir() {
return "", nil
}
xlist, err := xattr.List(path)
if err != nil {
return "", err
}
klist := make([]string, len(xlist))
for i := range xlist {
data, err := xattr.Get(path, xlist[i])
if err != nil {
return "", err
}
klist[i] = fmt.Sprintf("xattr.%s=%s", xlist[i], base64.StdEncoding.EncodeToString(data))
}
return strings.Join(klist, " "), nil
}
)