[LTP] [PATCH] rpc_lib.sh: fix portmapper detection in case of socket activation

[Petr Vorel]

> On Fri, 21 Jan 2022, Petr Vorel wrote:
> > Hi Nikita,

> > [ Cc: Steve as user-space maintainer, also Neil and whole linux-nfs ]

> > > On systemd-based linux hosts, rpcbind service is typically started via
> > > socket activation, when the first client connects. If no client has
> > > connected before LTP rpc test starts, rpcbind process will not be
> > > running at the time of check_portmap_rpcbind() execution, causing
> > > check_portmap_rpcbind() to report TCONF error.

> > > Fix that by adding a quiet invocation of 'rpcinfo' before checking for
> > > rpcbind.

> > Looks reasonable, but I'd prefer to have confirmation from NFS experts.

> > > For portmap, similar step is likely not needed, because portmap is used
> > > only on old systemd and those don't use systemd.

> > > Signed-off-by: Nikita Yushchenko <nikita.yushchenko@virtuozzo.com>
> > > ---
> > >  testcases/network/rpc/basic_tests/rpc_lib.sh | 6 ++++++
> > >  1 file changed, 6 insertions(+)

> > > diff --git a/testcases/network/rpc/basic_tests/rpc_lib.sh b/testcases/network/rpc/basic_tests/rpc_lib.sh
> > > index c7c868709..e882e41b3 100644
> > > --- a/testcases/network/rpc/basic_tests/rpc_lib.sh
> > > +++ b/testcases/network/rpc/basic_tests/rpc_lib.sh
> > > @@ -8,6 +8,12 @@ check_portmap_rpcbind()
> > >  	if pgrep portmap > /dev/null; then
> > >  		PORTMAPPER="portmap"
> > >  	else
> > > +		# In case of systemd socket activation, rpcbind could be
> > > +		# not started until somebody tries to connect to it's socket.
> > > +		#
> > > +		# To handle that case properly, run a client now.
> > > +		rpcinfo >/dev/null 2>&1

> If it were me, I would remove the 'pgrep's and just call "rpcbind -p"
> and make sure something responds.

Hi Neil,

I guess you mean: rpcinfo -p

Good idea, thanks!

Kind regards,
Petr

> NeilBrown



> > nit: Shouldn't we keep stderr? In LTP we put required commands into
> > $TST_NEEDS_CMDS. It'd be better not require rpcinfo (not a hard dependency),
> > and thus it'd be better to see "command not found" when rpcinfo missing and test
> > fails.

> > Kind regards,
> > Petr

> > > +
> > >  		pgrep rpcbind > /dev/null && PORTMAPPER="rpcbind" || \
> > >  			tst_brk TCONF "portmap or rpcbind is not running"
> > >  	fi