9704472d1c
ove QEMU (and other NixOS instances that use a remote filesystem like NFS): * Don't take down the network interfaces during shutdown. * Don't try to unmount the Nix store. Usually, this doesn't work because it's still in use, but on remote filesystems like CIFS the `-f' umount flag actually works. svn path=/nixos/branches/modular-nixos/; revision=16036
120 lines
3.3 KiB
Nix
120 lines
3.3 KiB
Nix
{pkgs, config, ...}:
|
|
|
|
###### implementation
|
|
|
|
|
|
let
|
|
|
|
inherit (pkgs) bash utillinux;
|
|
|
|
jobFun = event : {
|
|
name = "sys-" + event;
|
|
|
|
job = ''
|
|
start on ${event}
|
|
|
|
script
|
|
set +e # continue in case of errors
|
|
|
|
exec < /dev/tty1 > /dev/tty1 2>&1
|
|
echo ""
|
|
echo "<<< SYSTEM SHUTDOWN >>>"
|
|
echo ""
|
|
|
|
export PATH=${utillinux}/bin:${utillinux}/sbin:$PATH
|
|
|
|
|
|
# Set the hardware clock to the system time.
|
|
echo "Setting the hardware clock..."
|
|
hwclock --systohc --utc || true
|
|
|
|
|
|
# Do an initial sync just in case.
|
|
sync || true
|
|
|
|
|
|
# Kill all remaining processes except init and this one.
|
|
echo "Sending the TERM signal to all processes..."
|
|
kill -TERM -1 || true
|
|
|
|
sleep 1 # wait briefly
|
|
|
|
echo "Sending the KILL signal to all processes..."
|
|
kill -KILL -1 || true
|
|
|
|
|
|
# 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 $mp..."
|
|
# !!! Don't unmount /nix/store or /hostfs. This is
|
|
# a quick hack to cleanly shutdown VMs that mount
|
|
# the Nix store via CIFS. "mount -f" will actually
|
|
# work on such filesystems, which makes all commands
|
|
# needed below disappear.
|
|
if test "$mp" != /nix/store -a "$mp" != /hostfs && umount -f -n "$mp"; then
|
|
if test "$mp" != /; then tryAgain=1; fi
|
|
else
|
|
mount -n -o remount,ro "$mp" || true
|
|
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" || true
|
|
fi
|
|
done
|
|
done
|
|
|
|
cat /proc/mounts
|
|
|
|
|
|
# Final sync.
|
|
sync || true
|
|
|
|
|
|
# Either reboot or power-off the system. Note that the "halt"
|
|
# event also does a power-off.
|
|
if test ${event} = reboot; then
|
|
exec reboot -f
|
|
else
|
|
exec halt -f -p
|
|
fi
|
|
|
|
end script
|
|
'';
|
|
};
|
|
|
|
in
|
|
|
|
|
|
{
|
|
services = {
|
|
extraJobs = map jobFun ["reboot" "halt" "system-halt" "power-off"];
|
|
};
|
|
}
|