A race condition in my containers means that occasionally
/var/run/screen/ isn't present when startup finishes and I SSH in.
This results in an error when normal users try to run screen.
I believe the race is against my lxc integration job:
root@imago:~# cat /etc/init/lxc.conf
description "LXC vs. Upstart workarounds"
start on startup
task
console output
script
# As lxc 0.7's halt/reboot detection hack needs /var/run to NOT be a
# tmpfs, we need to manually clean it -- esp. the ifstate file that
# tells falsely tells ifupdown "lo is up".
#
# To debug, add -printf "Deleting stale file %p\n" before -delete.
find /var/run/ -xdev -not -path /var/run/ -delete
initctl emit -n stopped JOB=udevtrigger
initctl emit -n started JOB=udev
# This one is needed for broken ifupdown NMU 0.6.8ubuntu29.1
initctl emit -n net-device-up IFACE=lo LOGICAL=lo ADDRFAM=inet
METHOD=loopback
end script
The screen-cleanup job is
root@imago:~# grep -v ^$ /etc/init/screen-cleanup.conf
# screen
description "GNU Screen Cleanup"
author "Dustin Kirkland <[email protected]>"
start on filesystem
task
script
SCREENDIR=/var/run/screen
if [ -L $SCREENDIR ] || [ ! -d $SCREENDIR ]; then
rm -f $SCREENDIR
mkdir $SCREENDIR
chown root:utmp $SCREENDIR
fi
find $SCREENDIR -type p -delete
# If the local admin has used dpkg-statoverride to install the screen
# binary with different set[ug]id bits, change the permissions of
# $SCREENDIR accordingly
BINARYPERM=`stat -c%a /usr/bin/screen`
if [ "$BINARYPERM" -ge 4000 ]; then
chmod 0755 $SCREENDIR
elif [ "$BINARYPERM" -ge 2000 ]; then
chmod 0775 $SCREENDIR
else
chmod 0777 $SCREENDIR
fi
end script
Obviously the *right* solution is to use a tmpfs for /var/run, as
non-containerized Ubuntu does. Since this breaks lxc-start's
reboot/halt (via utmp) detection, I'm looking for the next best
workaround.
I think this is probably to disable /etc/init/mountall.conf and spoof
its events at the end of /etc/init/lxc.conf. mountall.conf is currently
a noop -- I don't allow containers to perform mounts -- but I left it
enabled because it generates a whole bunch of events and I haven't
gotten around to working out exactly what they are yet.
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