main/openrc: make netmount init.d work with Busybox umount

Busybox's umount does not support the "-O" option so only run "umount -a -O _netdev" if util-linux's umount is installed, otherwise loop through /proc/self/mountinfo instead and for each entry that contains "_netdev" in its option list then use Busybox's umount on it.

Fixes #9923 (closed) and #13789 (closed).

assigned to @ncopa

IMHO it would be preferable to implement the -O option in BusyBox umount instead of parsing /proc/self/mountinfo from shell.

I agree. However unless someone is willing to write such a patch for Busybox then this MR is a viable solution to the problem...

http://lists.busybox.net/pipermail/busybox/2022-June/089769.html

I haven't tested this with the netmount services specifically, so feel free to provide feedback in this regard.

See also: !35484 (merged)

mentioned in merge request !35484 (merged)

added status:mr-stale label

Sorry to bother you @dbradley,

but we've detected that this merge request hasn't seen any recent activity. If you need help or want to discuss your approach with developers you can ping @ncopa. You can also ask on IRC on #alpine-devel on irc.oftc.net. If no further activity occurs in this MR, Alpine developers may close it in the future.

Thanks for your contribution.

I agree that we'd rather fix this in busybox

closing this in favor of !35484 (merged)

closed