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*: xattr can Update()

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This is a gnarly patchset that has been mashed together.
It uncovered that some aspects of Check were never really working
correctly for `xattr` keywords, but also the `Update()` had been left
undone for a while.

This includes some API changes around the `Keyword` and `KeyVal` types.

Also I would like to update the signature for the `UpdateKeywordFunc` to
just accept a `KeyVal` as an argugment, rather than a keyword AND the
value. with this context there would be no need to guess on the value of
what's passed to the xattr update function of whether it needs or
already is base64 encoded.

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Vincent Batts 2017-06-15 14:54:58 -04:00
parent fb4ec19981
commit ed464af779
Signed by: vbatts
GPG key ID: 10937E57733F1362
19 changed files with 398 additions and 258 deletions
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59
keywordfuncs_linux.go
View file

@ -9,7 +9,6 @@ import (
"io"
"os"
"os/user"
"strings"
"syscall"
"github.com/vbatts/go-mtree/pkg/govis"
@ -18,91 +17,91 @@ import (
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) (KeyVal, error) {
return emptyKV, nil
flagsKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
return nil, nil
}
unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
unameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return KeyVal(fmt.Sprintf("uname=%s", hdr.Uname)), nil
return []KeyVal{KeyVal(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 emptyKV, err
return nil, nil
}
return KeyVal(fmt.Sprintf("uname=%s", u.Username)), nil
return []KeyVal{KeyVal(fmt.Sprintf("uname=%s", u.Username))}, nil
}
gnameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
gnameKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return KeyVal(fmt.Sprintf("gname=%s", hdr.Gname)), nil
return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", hdr.Gname))}, nil
}
stat := info.Sys().(*syscall.Stat_t)
g, err := lookupGroupID(fmt.Sprintf("%d", stat.Gid))
if err != nil {
return emptyKV, err
return nil, nil
}
return KeyVal(fmt.Sprintf("gname=%s", g.Name)), nil
return []KeyVal{KeyVal(fmt.Sprintf("gname=%s", g.Name))}, nil
}
uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
uidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return KeyVal(fmt.Sprintf("uid=%d", hdr.Uid)), nil
return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", hdr.Uid))}, nil
}
stat := info.Sys().(*syscall.Stat_t)
return KeyVal(fmt.Sprintf("uid=%d", stat.Uid)), nil
return []KeyVal{KeyVal(fmt.Sprintf("uid=%d", stat.Uid))}, nil
}
gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
gidKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
return KeyVal(fmt.Sprintf("gid=%d", hdr.Gid)), nil
return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", hdr.Gid))}, nil
}
if stat, ok := info.Sys().(*syscall.Stat_t); ok {
return KeyVal(fmt.Sprintf("gid=%d", stat.Gid)), nil
return []KeyVal{KeyVal(fmt.Sprintf("gid=%d", stat.Gid))}, nil
}
return emptyKV, nil
return nil, nil
}
nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
nlinkKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if stat, ok := info.Sys().(*syscall.Stat_t); ok {
return KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink)), nil
return []KeyVal{KeyVal(fmt.Sprintf("nlink=%d", stat.Nlink))}, nil
}
return emptyKV, nil
return nil, nil
}
xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (KeyVal, error) {
xattrKeywordFunc = func(path string, info os.FileInfo, r io.Reader) ([]KeyVal, error) {
if hdr, ok := info.Sys().(*tar.Header); ok {
if len(hdr.Xattrs) == 0 {
return emptyKV, nil
return nil, nil
}
klist := []KeyVal{}
for k, v := range hdr.Xattrs {
encKey, err := govis.Vis(k, DefaultVisFlags)
if err != nil {
return emptyKV, err
return nil, nil
}
klist = append(klist, KeyVal(fmt.Sprintf("xattr.%s=%s", encKey, base64.StdEncoding.EncodeToString([]byte(v)))))
}
return KeyVal(strings.Join(KeyValToString(klist), " ")), nil
return klist, nil
}
if !info.Mode().IsRegular() && !info.Mode().IsDir() {
return emptyKV, nil
return nil, nil
}
xlist, err := xattr.List(path)
if err != nil {
return emptyKV, err
return nil, nil
}
klist := make([]KeyVal, len(xlist))
for i := range xlist {
data, err := xattr.Get(path, xlist[i])
if err != nil {
return emptyKV, err
return nil, nil
}
encKey, err := govis.Vis(xlist[i], DefaultVisFlags)
if err != nil {
return emptyKV, err
return nil, nil
}
klist[i] = KeyVal(fmt.Sprintf("xattr.%s=%s", encKey, base64.StdEncoding.EncodeToString(data)))
}
return KeyVal(strings.Join(KeyValToString(klist), " ")), nil
return klist, nil
}
)