[LTP] [PATCH v2 1/2] tst_net.sh: Detect IPv6 disabled via sysct

[Petr Vorel]

Hi Cyril,

> > > +	cmd='sysctl -n net.ipv6.conf.all.disable_ipv6'

> > I'm not sure why we should use sysctl when this the same as doing

> > cat /proc/sys/net/ipv6/conf/all/disable_ipv6
> > Or is there any added value from the sysctl command?

> No, but we already use sysctl in tst_init_iface():
> sysctl -qw net.ipv6.conf.$iface.accept_dad=0 || return $?
> tst_rhost_run -c "sysctl -qw net.ipv6.conf.$iface.accept_dad=0" || return $?

> and we don't check for sysctl (expecting is everywhere). I'd also allow using
> sysctl (and then add a check via tst_require_cmds) or change also these with
> cat for reading and echo ... > for writing. WDYT?

BTW tst_set_sysctl() and it's use would need to be rewritten to get benefit of
getting rid of using sysctl. But I can use cat in this case to not extending
sysctl dependency.

Kind regards,
Petr

> Kind regards,
> Petr