[OE-core] [PATCH] connman: get the correct network interface name from dmesg during NFS booting

[Jagadeesh Krishnanjanappa]

On Wed, Oct 12, 2016 at 12:30 PM, Andreas Oberritter <obi at opendreambox.org>
wrote:

> Hi Jagadeesh,
>
> On 11.10.2016 14:11, Jagadeesh Krishnanjanappa wrote:
> > Hi Andreas,
> >
> > Thanks for reviewing the patch.
> >
> >
> >     I think this is too fragile to land in OE-Core. What happens if a
> >     network driver prints "device=eth0"? Or if other kernel messages make
> >     the string disappear from dmesg and connman gets restarted later?
> >
> >
> > True. If device=eth0 gets disappeared/corrupted, then we may have
> problem.
> >
> >
> >     FWIW, I'm attaching my current wrapper script for connmand. I don't
> >     think it's perfect, but at least it doesn't depend on any init
> manager
> >     and works across restarts.
> >
> > The wrapper script attached by you, takes care of the missing scenarios.
> > Seems to be more complete.
> >
> >
> >
> >     Add these lines to connman's do_install, in case you'd like to test
> >     and/or submit it:
> >
> >     mv ${D}${sbindir}/connmand ${D}${sbindir}/connmand.real
> >     install -m 755 ${WORKDIR}/connmand-nfsroot.in
> >     <http://connmand-nfsroot.in> ${D}${sbindir}/connmand
> >     sed -e 's, at sbindir@,${sbindir},g' -i ${D}${sbindir}/connmand
> >
> > I think it would be good idea to integrate your changes into the already
> > existing OE-core's connman script, instead of a calling original connman
> > script from the wrapper script.
>
> please keep in mind that you'd need to implement the same logic for
> systemd.
>
> Considering that the execution of connman on nfsroots without
> appropriate parameters immediately hangs the system, a wrapper script
> offers an additional level of protection compared to an init script or
> systemd unit, especially for people debugging connman.
>
> The intention of integrating your changes into init script was to avoid an
extra file being added to the layer. But yes, to help debugging and to
support systemd; wrapper script can be helpful.

Thanks,
Jagadeesh

Regards,
> Andreas
>
> >
> > Regards,
> > Jagadeesh
> >
> >     >
> >     > Signed-off-by: Jagadeesh Krishnanjanappa
> >     <jkrishnanjanappa at mvista.com <mailto:jkrishnanjanappa at mvista.com>>
> >     > ---
> >     >  meta/recipes-connectivity/connman/connman/connman | 35
> >     +++++++++++++----------
> >     >  1 file changed, 20 insertions(+), 15 deletions(-)
> >     >
> >     > diff --git a/meta/recipes-connectivity/connman/connman/connman
> >     b/meta/recipes-connectivity/connman/connman/connman
> >     > index c64fa0d..aae2ca6 100644
> >     > --- a/meta/recipes-connectivity/connman/connman/connman
> >     > +++ b/meta/recipes-connectivity/connman/connman/connman
> >     > @@ -29,23 +29,28 @@ done
> >     >  do_start() {
> >     >       EXTRA_PARAM=""
> >     >       if test $nfsroot -eq 1 ; then
> >     > -         NET_DEVS=`cat /proc/net/dev | sed -ne 's/^\([a-zA-Z0-9
> >     ]*\):.*$/\1/p'`
> >     > -         NET_ADDR=`cat /proc/cmdline | sed -ne 's/^.*ip=\([^
> >     :]*\).*$/\1/p'`
> >     > +         ethn_from_dmesg=`dmesg | grep "device="| sed
> >     "s|\(.*\)device=\(.*\), hwaddr=\(.*\)|\2|g"`
> >     > +         if [ ! -z "$ethn_from_dmesg" ]; then
> >     > +             EXTRA_PARAM="-I $ethn_from_dmesg"
> >     > +         else
> >     > +             NET_DEVS=`cat /proc/net/dev | sed -ne
> >     's/^\([a-zA-Z0-9 ]*\):.*$/\1/p'`
> >     > +             NET_ADDR=`cat /proc/cmdline | sed -ne 's/^.*ip=\([^
> >     :]*\).*$/\1/p'`
> >     >
> >     > -         if [ ! -z "$NET_ADDR" ]; then
> >     > -             if [ "$NET_ADDR" = dhcp ]; then
> >     > -                 ethn=`ifconfig | grep "^eth" | sed -e
> >     "s/\(eth[0-9]\)\(.*\)/\1/"`
> >     > -                 if [ ! -z "$ethn" ]; then
> >     > -                     EXTRA_PARAM="-I $ethn"
> >     > -                 fi
> >     > -             else
> >     > -                 for i in $NET_DEVS; do
> >     > -                     ADDR=`ifconfig $i | sed 's/addr://g' | sed
> >     -ne 's/^.*inet \([0-9.]*\) .*$/\1/p'`
> >     > -                     if [ "$NET_ADDR" = "$ADDR" ]; then
> >     > -                         EXTRA_PARAM="-I $i"
> >     > -                         break
> >     > +             if [ ! -z "$NET_ADDR" ]; then
> >     > +                 if [ "$NET_ADDR" = dhcp ]; then
> >     > +                     ethn=`ifconfig | grep "^eth" | sed -e
> >     "s/\(eth[0-9]\)\(.*\)/\1/"`
> >     > +                     if [ ! -z "$ethn" ]; then
> >     > +                         EXTRA_PARAM="-I $ethn"
> >     >                       fi
> >     > -                 done
> >     > +                 else
> >     > +                     for i in $NET_DEVS; do
> >     > +                         ADDR=`ifconfig $i | sed 's/addr://g' |
> >     sed -ne 's/^.*inet \([0-9.]*\) .*$/\1/p'`
> >     > +                         if [ "$NET_ADDR" = "$ADDR" ]; then
> >     > +                             EXTRA_PARAM="-I $i"
> >     > +                             break
> >     > +                         fi
> >     > +                     done
> >     > +                 fi
> >     >               fi
> >     >           fi
> >     >       fi
> >     >
> >
> >
> >     --
> >     _______________________________________________
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> >     Openembedded-core at lists.openembedded.org
> >     <mailto:Openembedded-core at lists.openembedded.org>
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> >
> >
>
>
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