mirror of
https://github.com/vbatts/tar-split.git
synced 2024-11-16 13:28:37 +00:00
Vincent Batts
7e2ed0b70b
Rather than an arbitrary election of hashing the xattr value with SHA1 to avoid leaking the value. By going with base64 encoding it allows for the possibility of restoring a directory with the values stored in the manifest. Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
77 lines
2 KiB
Go
77 lines
2 KiB
Go
package mtree
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import (
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"archive/tar"
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"encoding/base64"
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"fmt"
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"io"
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"os"
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"os/user"
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"strings"
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"syscall"
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"github.com/vbatts/go-mtree/xattr"
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)
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var (
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unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
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if hdr, ok := info.Sys().(*tar.Header); ok {
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return fmt.Sprintf("uname=%s", hdr.Uname), nil
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}
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stat := info.Sys().(*syscall.Stat_t)
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u, err := user.LookupId(fmt.Sprintf("%d", stat.Uid))
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("uname=%s", u.Username), nil
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}
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uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
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if hdr, ok := info.Sys().(*tar.Header); ok {
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return fmt.Sprintf("uid=%d", hdr.Uid), nil
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}
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stat := info.Sys().(*syscall.Stat_t)
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return fmt.Sprintf("uid=%d", stat.Uid), nil
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}
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gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
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if hdr, ok := info.Sys().(*tar.Header); ok {
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return fmt.Sprintf("gid=%d", hdr.Gid), nil
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}
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if stat, ok := info.Sys().(*syscall.Stat_t); ok {
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return fmt.Sprintf("gid=%d", stat.Gid), nil
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}
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return "", nil
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}
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nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
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if stat, ok := info.Sys().(*syscall.Stat_t); ok {
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return fmt.Sprintf("nlink=%d", stat.Nlink), nil
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}
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return "", nil
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}
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xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
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if hdr, ok := info.Sys().(*tar.Header); ok {
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if len(hdr.Xattrs) == 0 {
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return "", nil
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}
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klist := []string{}
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for k, v := range hdr.Xattrs {
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klist = append(klist, fmt.Sprintf("xattr.%s=%s", k, base64.StdEncoding.EncodeToString([]byte(v))))
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}
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return strings.Join(klist, " "), nil
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}
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xlist, err := xattr.List(path)
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if err != nil {
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return "", err
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}
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klist := make([]string, len(xlist))
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for i := range xlist {
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data, err := xattr.Get(path, xlist[i])
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if err != nil {
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return "", err
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}
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klist[i] = fmt.Sprintf("xattr.%s=%s", xlist[i], base64.StdEncoding.EncodeToString(data))
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}
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return strings.Join(klist, " "), nil
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}
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)
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