// Stat produces a styxproto.Stat from an open file. If the value
// provides a Stat method matching that of os.File, that is used.
// Otherwise, the styxfile package determines the file's attributes
// based on other characteristics.
func Stat(buf []byte, file Interface, name string, qid styxproto.Qid) (styxproto.Stat, error) {
var (
fi os.FileInfo
err error
)
type hasStat interface {
Stat() (os.FileInfo, error)
}
if v, ok := file.(hasStat); ok {
fi, err = v.Stat()
if err != nil {
return nil, err
}
} else {
fi = statGuess{file, name, qid.Type()}
}
uid, gid, muid := sys.FileOwner(fi)
stat, _, err := styxproto.NewStat(buf, fi.Name(), uid, gid, muid)
if err != nil {
return nil, err
}
stat.SetLength(fi.Size())
stat.SetMode(Mode9P(fi.Mode()))
stat.SetAtime(uint32(fi.ModTime().Unix()))
stat.SetMtime(uint32(fi.ModTime().Unix()))
stat.SetQid(qid)
return stat, nil
}
// Rstat responds to a succesful Tstat request. The styx package will
// translate the os.FileInfo value into the appropriate 9P structure. Rstat
// will attempt to resolve the names of the file's owner and group. If
// that cannot be done, an empty string is sent. If err is non-nil, and error
// is sent to the client instead.
func (t Tstat) Rstat(info os.FileInfo, err error) {
if err != nil {
t.Rerror("%s", err)
return
}
buf := make([]byte, styxproto.MaxStatLen)
uid, gid, muid := sys.FileOwner(info)
name := info.Name()
if name == "/" {
name = "."
}
stat, _, err := styxproto.NewStat(buf, name, uid, gid, muid)
if err != nil {
// should never happen
panic(err)
}
mode := styxfile.Mode9P(info.Mode())
stat.SetLength(info.Size())
stat.SetMode(mode)
stat.SetAtime(uint32(info.ModTime().Unix())) // TODO: get atime
stat.SetMtime(uint32(info.ModTime().Unix()))
stat.SetQid(t.session.conn.qid(t.Path(), styxfile.QidType(mode)))
t.session.unhandled = false
if t.session.conn.clearTag(t.tag) {
t.session.conn.Rstat(t.tag, stat)
}
}
func (s *Session) handleTstat(cx context.Context, msg styxproto.Tstat, file file) bool {
buf := make([]byte, styxproto.MaxStatLen)
if file.auth {
stat, _, err := styxproto.NewStat(buf, "", "", "", "")
if err != nil {
// input is not user-controlled, this should
// never happen
panic(err)
}
stat.SetMode(styxproto.DMAUTH)
stat.SetQid(s.conn.qid("", styxproto.QTAUTH))
s.conn.clearTag(msg.Tag())
s.conn.Rstat(msg.Tag(), stat)
s.conn.Flush()
} else if file.rwc != nil {
s.conn.clearTag(msg.Tag())
if qid, ok := s.conn.qidpool.Get(file.name); !ok {
s.conn.Rerror(msg.Tag(), "qid for %s not found", file.name)
} else if stat, err := styxfile.Stat(buf, file.rwc, file.name, qid); err != nil {
s.conn.Rerror(msg.Tag(), "%s", err)
} else {
s.conn.Rstat(msg.Tag(), stat)
}
s.conn.Flush()
} else {
s.requests <- Tstat{
reqInfo: newReqInfo(cx, s, msg, file.name),
}
}
return true
}
func ExampleNewStat() {
buf := make([]byte, 100)
s, buf, err := styxproto.NewStat(buf, "messages.log", "root", "wheel", "")
if err != nil {
log.Fatal(err)
}
s.SetLength(309)
s.SetMode(0640)
fmt.Println(s)
// Output: type=0 dev=0 qid="type=0 ver=0 path=0" mode=640 atime=0 mtime=0 length=309 name="messages.log" uid="root" gid="wheel" muid=""
}
func blankStat(name, uid, gid string) styxproto.Stat {
buf := make([]byte, styxproto.MaxStatLen)
stat, _, err := styxproto.NewStat(buf, name, uid, gid, uid)
if err != nil {
panic(err)
}
stat.SetAtime(maxuint32)
stat.SetMtime(maxuint32)
stat.SetDev(maxuint32)
stat.SetLength(-1)
stat.SetMode(maxuint32)
for i := range stat.Qid() {
stat.Qid()[i] = 0xff
}
stat.SetType(maxuint16)
return stat
}
func marshalStats(buf []byte, files []os.FileInfo, dir string, pool *qidpool.Pool) (int, error) {
var (
stat styxproto.Stat
n = 0
err error
)
for _, fi := range files {
uid, gid, muid := sys.FileOwner(fi)
stat, buf, err = styxproto.NewStat(buf, fi.Name(), uid, gid, muid)
if err != nil {
break
}
n += len(stat)
mode := Mode9P(fi.Mode())
qtype := QidType(mode)
stat.SetMtime(uint32(fi.ModTime().Unix()))
stat.SetAtime(stat.Mtime())
stat.SetLength(fi.Size())
stat.SetMode(mode)
stat.SetQid(pool.Put(path.Join(dir, fi.Name()), qtype))
}
return n, err
}
