Re: [PATCH] virtiofsd: Fix check of chown()'s return value

[Greg Kurz <groug@kaod.org>]

On Mon, 10 May 2021 15:16:23 +0100
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:

> * Greg Kurz (groug@kaod.org) wrote:
> > Otherwise you always get this warning when using --socket-group=users
> > 
> >  vhost socket failed to set group to users (100)
> > 
> > While here, print out the error if chown() fails.
> > 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> 
> probably needs a fixes:  but yes.
> 

Fixes: f6698f2b03b0 ("tools/virtiofsd: add support for --socket-group")

> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> 
> > ---
> >  tools/virtiofsd/fuse_virtio.c |    4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c
> > index 3e13997406bf..638d3ffe2f8a 100644
> > --- a/tools/virtiofsd/fuse_virtio.c
> > +++ b/tools/virtiofsd/fuse_virtio.c
> > @@ -978,9 +978,9 @@ static int fv_create_listen_socket(struct fuse_session *se)
> >      if (se->vu_socket_group) {
> >          struct group *g = getgrnam(se->vu_socket_group);
> >          if (g) {
> > -            if (!chown(se->vu_socket_path, -1, g->gr_gid)) {
> > +            if (chown(se->vu_socket_path, -1, g->gr_gid) == -1) {
> >                  fuse_log(FUSE_LOG_WARNING,
> > -                         "vhost socket failed to set group to %s (%d)\n",
> > +                         "vhost socket failed to set group to %s (%d): %m\n",
> >                           se->vu_socket_group, g->gr_gid);
> >              }
> >          }
> > 
> >