483ee6219e
/nix bind mounted from a fs not rootfs. As niksnut found, if the sources of bind mounted directories are umounted before remounting them as "ro", a "mount -o remount,ro" on the bind targets will not leave the filesystem properly umounted, the same way as a "-o remount,ro" would do on a usual filesystem. So, the trick of always remounting as 'ro' before attempting an umount seems to fix the problem. svn path=/nixos/trunk/; revision=19008
145 lines
4.3 KiB
Nix
145 lines
4.3 KiB
Nix
{ config, pkgs, ... }:
|
||
|
||
with pkgs.lib;
|
||
|
||
{
|
||
|
||
jobs.shutdown =
|
||
{ name = "shutdown";
|
||
|
||
task = true;
|
||
|
||
environment = { MODE = "poweroff"; };
|
||
|
||
script =
|
||
''
|
||
set +e # continue in case of errors
|
||
|
||
${pkgs.kbd}/bin/chvt 1
|
||
|
||
exec < /dev/console > /dev/console 2>&1
|
||
echo ""
|
||
if test "$MODE" = maintenance; then
|
||
echo "[1;32m<<< Entering maintenance mode >>>[0m"
|
||
else
|
||
echo "[1;32m<<< System shutdown >>>[0m"
|
||
fi
|
||
echo ""
|
||
|
||
export PATH=${pkgs.utillinux}/bin:${pkgs.utillinux}/sbin:$PATH
|
||
|
||
|
||
# Set the hardware clock to the system time.
|
||
echo "setting the hardware clock..."
|
||
hwclock --systohc --utc
|
||
|
||
|
||
# Do an initial sync just in case.
|
||
sync
|
||
|
||
|
||
# Stop all Upstart jobs.
|
||
initctl list | while IFS=", " read jobName status rest; do
|
||
if test "$jobName" != shutdown -a "$status" != "stop/waiting"; then
|
||
echo "stopping $jobName..."
|
||
stop "$jobName"
|
||
fi
|
||
done
|
||
|
||
|
||
# Kill all remaining processes except init and this one.
|
||
echo "sending the TERM signal to all processes..."
|
||
kill -TERM -1
|
||
|
||
sleep 1 # wait briefly
|
||
|
||
echo "sending the KILL signal to all processes..."
|
||
kill -KILL -1
|
||
|
||
|
||
# If maintenance mode is requested, start a root shell, and
|
||
# afterwards emit the "startup" event to bring everything
|
||
# back up.
|
||
if test "$MODE" = maintenance; then
|
||
echo ""
|
||
echo "[1;32m<<< Maintenance shell >>>[0m"
|
||
echo ""
|
||
while ! ${pkgs.bash}/bin/bash --login; do true; done
|
||
initctl emit -n startup
|
||
exit 0
|
||
fi
|
||
|
||
|
||
# Unmount helper functions.
|
||
getMountPoints() {
|
||
cat /proc/mounts \
|
||
| grep -v '^rootfs' \
|
||
| sed 's|^[^ ]\+ \+\([^ ]\+\).*|\1|' \
|
||
| grep -v '/proc\|/sys\|/dev'
|
||
}
|
||
|
||
getDevice() {
|
||
local mountPoint=$1
|
||
cat /proc/mounts \
|
||
| grep -v '^rootfs' \
|
||
| grep "^[^ ]\+ \+$mountPoint \+" \
|
||
| sed 's|^\([^ ]\+\).*|\1|'
|
||
}
|
||
|
||
# Unmount file systems. We repeat this until no more file systems
|
||
# can be unmounted. This is to handle loopback devices, file
|
||
# systems mounted on other file systems and so on.
|
||
tryAgain=1
|
||
while test -n "$tryAgain"; do
|
||
tryAgain=
|
||
|
||
for mp in $(getMountPoints); do
|
||
device=$(getDevice $mp)
|
||
echo "unmounting $mp..."
|
||
|
||
# We need to remount,ro before attempting any
|
||
# umount, or bind mounts may get confused, with
|
||
# the fs not being properly flushed at the end.
|
||
|
||
# `-i' is to workaround a bug in mount.cifs (it
|
||
# doesn't recognise the `remount' option, and
|
||
# instead mounts the FS again).
|
||
mount -n -i -o remount,ro "$mp"
|
||
|
||
# Note: don't use `umount -f'; it's very buggy.
|
||
# (For instance, when applied to a bind-mount it
|
||
# unmounts the target of the bind-mount.) !!! But
|
||
# we should use `-f' for NFS.
|
||
if umount -n "$mp"; then
|
||
if test "$mp" != /; then tryAgain=1; fi
|
||
fi
|
||
|
||
# Hack: work around a bug in mount (mount -o remount on a
|
||
# loop device forgets the loop=/dev/loopN entry in
|
||
# /etc/mtab).
|
||
if echo "$device" | grep -q '/dev/loop'; then
|
||
echo "removing loop device $device..."
|
||
losetup -d "$device"
|
||
fi
|
||
done
|
||
done
|
||
|
||
|
||
# Final sync.
|
||
sync
|
||
|
||
|
||
# Either reboot or power-off the system.
|
||
if test "$MODE" = reboot; then
|
||
echo "rebooting..."
|
||
sleep 1
|
||
exec reboot -f
|
||
else
|
||
echo "powering off..."
|
||
sleep 1
|
||
exec halt -f -p
|
||
fi
|
||
'';
|
||
};
|
||
|
||
}
|