nixpkgs/modules/system/upstart-events/shutdown.nix
Peter Simons eb6e1310b8 strip trailing whitespace; no functional change
svn path=/nixos/trunk/; revision=29285
2011-09-14 18:20:50 +00:00

151 lines
4.8 KiB
Nix
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

{ config, pkgs, ... }:
with pkgs.lib;
{
jobs.shutdown =
{ name = "shutdown";
task = true;
stopOn = ""; # must override the default ("starting shutdown")
environment = { MODE = "poweroff"; };
extraConfig = "console owner";
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 "<<< Entering maintenance mode >>>"
else
echo "<<< System shutdown >>>"
fi
echo ""
${config.powerManagement.powerDownCommands}
export PATH=${pkgs.utillinux}/bin:${pkgs.utillinux}/sbin:$PATH
# Do an initial sync just in case.
sync
# Kill all remaining processes except init, this one and any
# Upstart jobs that don't stop on the "starting shutdown"
# event, as these are necessary to complete the shutdown.
omittedPids=$(initctl list | sed -e 's/.*process \([0-9]\+\)/-o \1/;t;d')
#echo "saved PIDs: $omittedPids"
echo "sending the TERM signal to all processes..."
${pkgs.sysvtools}/bin/killall5 -15 $job $omittedPids
sleep 1 # wait briefly
echo "sending the KILL signal to all processes..."
${pkgs.sysvtools}/bin/killall5 -9 $job $omittedPids
# If maintenance mode is requested, start a root shell, and
# afterwards emit the "startup" event to bring everything
# back up.
if test "$MODE" = maintenance; then
echo ""
echo "<<< Maintenance shell >>>"
echo ""
${pkgs.shadow}/bin/login root
initctl emit -n startup
exit 0
fi
# Write a shutdown record to wtmp while /var/log is still writable.
reboot --wtmp-only
# Set the hardware clock to the system time.
echo "setting the hardware clock..."
hwclock --systohc --utc
# Stop all swap devices.
swapoff -a
# Unmount file systems. We repeat this until no more file systems
# can be unmounted. This is to handle loopback devices, file
# systems mounted on other file systems and so on.
tryAgain=1
while test -n "$tryAgain"; do
tryAgain=
failed= # list of mount points that couldn't be unmounted/remounted
cp /proc/mounts /dev/.mounts # don't read /proc/mounts while it's changing
exec 4< /dev/.mounts
while read -u 4 device mp fstype options rest; do
# Skip various special filesystems. Non-existent
# mount points are typically tmpfs/aufs mounts from
# the initrd.
if [ "$mp" = /proc -o "$mp" = /sys -o "$mp" = /dev -o "$device" = "rootfs" -o "$mp" = /run -o "$mp" = /var/run -o "$mp" = /var/lock -o ! -e "$mp" ]; then continue; fi
echo "unmounting $mp..."
# We need to remount,ro before attempting any
# umount, or bind mounts may get confused, with
# the fs not being properly flushed at the end.
# `-i' is to workaround a bug in mount.cifs (it
# doesn't recognise the `remount' option, and
# instead mounts the FS again).
success=
if mount -t "$fstype" -n -i -o remount,ro "device" "$mp"; then success=1; fi
# Note: don't use `umount -f'; it's very buggy.
# (For instance, when applied to a bind-mount it
# unmounts the target of the bind-mount.) !!! But
# we should use `-f' for NFS.
if [ "$mp" != / -a "$mp" != /nix -a "$mp" != /nix/store ]; then
if umount -n "$mp"; then success=1; tryAgain=1; fi
fi
if [ -z "$success" ]; then failed="$failed $mp"; fi
done
done
# Warn about filesystems that could not be unmounted or
# remounted read-only.
if [ -n "$failed" ]; then
echo "warning: the following filesystems could not be unmounted:"
for mp in $failed; do echo " $mp"; done
sleep 5
fi
# Final sync.
sync
# Either reboot or power-off the system.
if test "$MODE" = reboot; then
echo "rebooting..."
sleep 1
exec reboot -f
else
echo "powering off..."
sleep 1
exec halt -f -p
fi
'';
};
}