[LTP] [PATCH v4 1/2] net: Add tst_net_run helper

[Petr Vorel <pvorel@suse.cz>]

Hi Alexey,

> > Maybe we could signal where error occurred:
> > * return 0: ok on both lhost and rhost
> > * return 1: failure on lhost
> > * return 2: failure on rhost
> > * return 3: failure on both lhost and rhost


> It is only when there is no "safe" option, right?
yes, as safe exit with TCONF and warning.

> when doing cleanup?
IMHO in any "non-safe" run.

> Could we print TWARN message inside tst_net_run() in such case?
I wanted tst_net_run() to behave similarly as tst_rhost_run(), which doesn't
warn about it. So I propose to add warning to both functions, but also add -q
flag (quiet), which suppress this warning.

The reason for quiet mode is, that (I suppose) there are cases when some
features is tested and TWARN isn't wanted. Some examples (looks -s is used often
in cleanup functions):

testcases/network/stress/multicast/grp-operation/mcast-lib.sh:

mcast_cleanup()
{
    [ "$TST_IPV6" ] && mcast_cleanup6 || mcast_cleanup4

    pkill -SIGHUP -f "$MCAST_LCMD"
    tst_sleep 10ms
    pkill -9 -f "$MCAST_LCMD"

    tst_rhost_run -c "pkill -SIGHUP -f '$MCAST_RCMD'"
}

testcases/network/virt/virt_lib.sh
virt_cleanup_rmt()
{
    cleanup_vifaces
    tst_rhost_run -c "ip link delete ltp_v0 2>/dev/null"
    if [ "$virt_tcp_syn" ]; then
        sysctl -q net.ipv4.tcp_syn_retries=$virt_tcp_syn
        virt_tcp_syn=
    fi
}

nfs_setup_server() in testcases/network/nfs/nfs_stress/nfs_lib.sh:

	if ! tst_rhost_run -c "test -d $remote_dir"; then
        tst_rhost_run -s -c "mkdir -p $remote_dir; $export_cmd"
    fi


Kind regards,
Petr