125 lines
3.4 KiB
Nix
125 lines
3.4 KiB
Nix
{pkgs, config, ...}:
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###### implementation
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let
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inherit (pkgs) bash utillinux;
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jobFun = event : {
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name = "sys-" + event;
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job = ''
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start on ${event}
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script
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set +e # continue in case of errors
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exec < /dev/tty1 > /dev/tty1 2>&1
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echo ""
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echo "<<< SYSTEM SHUTDOWN >>>"
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echo ""
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export PATH=${utillinux}/bin:${utillinux}/sbin:$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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# 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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# 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 $mp..."
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# Note: don't use `umount -f'; it's very buggy.
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# (For instance, when applied to a bind-mount it
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# unmounts the target of the bind-mount.) !!! But
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# we should use `-f' for NFS.
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if umount -n "$mp"; then
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if test "$mp" != /; then tryAgain=1; fi
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else
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# `-i' is to workaround a bug in mount.cifs (it
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# doesn't recognise the `remount' option, and
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# instead mounts the FS again).
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mount -n -i -o remount,ro "$mp"
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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. Note that the "halt"
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# event also does a power-off.
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if test ${event} = 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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end script
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'';
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};
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in
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{
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services = {
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extraJobs = map jobFun ["reboot" "halt" "system-halt" "power-off"];
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};
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}
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