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