func (pf *ProxyFile) Stat() (protocol.Stat, error) {
if err := pf.updateInfo(); err != nil {
return protocol.Stat{}, err
}
pf.cache(true)
defer pf.cache(false)
var err error
st := protocol.Stat{}
st.Qid, err = pf.Qid()
if err != nil {
return protocol.Stat{}, err
}
st.Mode = protocol.FileMode(pf.info.Mode() & 0777)
if pf.info.IsDir() {
st.Mode |= protocol.DMDIR
}
st.Atime = uint32(pf.info.ModTime().Unix())
st.Mtime = st.Mtime
st.Length = uint64(pf.info.Size())
st.Name = filepath.Base(pf.path)
st.UID = pf.user
st.GID = pf.user
st.MUID = pf.user
return st, nil
}
func (c *Client) Create(name string, directory bool) error {
dir := path.Dir(name)
file := path.Base(name)
fid, _, err := c.walkTo(dir)
if err != nil {
return err
}
defer c.clunk(fid)
perms := protocol.FileMode(0755)
if directory {
perms |= protocol.DMDIR
}
creq := &protocol.CreateRequest{
Tag: c.c.NextTag(),
Fid: fid,
Name: file,
Permissions: perms,
Mode: protocol.OREAD,
}
_, err = c.c.Create(creq)
if err != nil {
return err
}
return nil
}
func setStat(user string, e File, parent Dir, nstat protocol.Stat) error {
ostat, err := e.Stat()
if err != nil {
return err
}
needWrite := false
rename := false
curname := ""
newname := ""
if nstat.Type != ^uint16(0) && nstat.Type != ostat.Type {
return errors.New("it is illegal to modify type")
}
if nstat.Dev != ^uint32(0) && nstat.Dev != ostat.Dev {
return errors.New("it is illegal to modify dev")
}
if nstat.Mode != ^protocol.FileMode(0) && nstat.Mode != ostat.Mode {
// TODO Ensure we don't flip DMDIR
if user != ostat.UID {
return errors.New("only owner can change mode")
}
ostat.Mode = ostat.Mode&protocol.DMDIR | nstat.Mode & ^protocol.DMDIR
}
if nstat.Atime != ^uint32(0) && nstat.Atime != ostat.Atime {
return errors.New("it is illegal to modify atime")
}
if nstat.Mtime != ^uint32(0) && nstat.Mtime != ostat.Mtime {
if user != ostat.UID {
return errors.New("only owner can change mtime")
}
needWrite = true
ostat.Mtime = nstat.Mtime
}
if nstat.Length != ^uint64(0) && nstat.Length != ostat.Length {
if ostat.Mode&protocol.DMDIR != 0 {
return errors.New("cannot set length of directory")
}
if nstat.Length > ostat.Length {
return errors.New("cannot extend length")
}
ostat.Length = nstat.Length
}
if nstat.Name != "" && nstat.Name != ostat.Name {
if parent != nil {
curname = ostat.Name
newname = nstat.Name
ostat.Name = nstat.Name
rename = true
} else {
return errors.New("it is illegal to rename root")
}
}
if nstat.UID != "" && nstat.UID != ostat.UID {
// NOTE: It is normally illegal to change the file owner, but we are a bit more relaxed.
ostat.UID = nstat.UID
needWrite = true
}
if nstat.GID != "" && nstat.GID != ostat.GID {
ostat.GID = nstat.GID
needWrite = true
}
if nstat.MUID != "" && nstat.MUID != ostat.MUID {
return errors.New("it is illegal to modify muid")
}
if needWrite {
x, err := e.Open(user, protocol.OWRITE)
if err != nil {
return err
}
x.Close()
}
// Try to perform the rename
if rename {
if err := parent.Rename(user, curname, newname); err != nil {
return err
}
}
return e.WriteStat(ostat)
}
