![Peter Simons](/assets/img/avatar_default.png)
Upstart won't find a "bash" binary in $PATH when those commands are run, so we refer to it using an absolute path. svn path=/nixos/trunk/; revision=31157
163 lines
5.3 KiB
Nix
163 lines
5.3 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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{
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jobs.shutdown =
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{ name = "shutdown";
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task = true;
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stopOn = ""; # must override the default ("starting shutdown")
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environment = { MODE = "poweroff"; };
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extraConfig = "console owner";
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script =
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''
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set +e # continue in case of errors
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${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 "$MODE" = maintenance; then
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echo "[1;32m<<< Entering maintenance mode >>>[0m"
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else
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echo "[1;32m<<< System shutdown >>>[0m"
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fi
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echo ""
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${config.powerManagement.powerDownCommands}
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export PATH=${pkgs.utillinux}/bin:${pkgs.utillinux}/sbin:$PATH
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# Do an initial sync just in case.
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sync
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# Kill all remaining processes except init, this one and any
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# Upstart jobs that don't stop on the "starting shutdown"
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# event, as these are necessary to complete the shutdown.
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omittedPids=$(initctl list | sed -e 's/.*process \([0-9]\+\)/-o \1/;t;d')
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#echo "saved PIDs: $omittedPids"
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echo "sending the TERM signal to all processes..."
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${pkgs.sysvtools}/bin/killall5 -15 $job $omittedPids
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sleep 1 # wait briefly
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echo "sending the KILL signal to all processes..."
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${pkgs.sysvtools}/bin/killall5 -9 $job $omittedPids
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# If maintenance mode is requested, start a root shell, and
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# afterwards emit the "startup" event to bring everything
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# back up.
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if test "$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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${pkgs.shadow}/bin/login root
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initctl emit -n startup
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exit 0
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fi
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# Write a shutdown record to wtmp while /var/log is still writable.
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reboot --wtmp-only
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# Set the hardware clock to the system time.
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echo "setting the hardware clock..."
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hwclock --systohc --utc
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# Stop all swap devices.
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swapoff -a
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# Unmount file systems. We repeat this until no more file systems
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# can be unmounted. This is to handle loopback devices, file
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# systems mounted on other file systems and so on.
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tryAgain=1
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while test -n "$tryAgain"; do
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tryAgain=
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failed= # list of mount points that couldn't be unmounted/remounted
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# Get rid of loopback devices.
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loDevices=$(losetup -a | sed 's#^\(/dev/loop[0-9]\+\).*#\1#')
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if [ -n "$loDevices" ]; then
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echo "removing loopback devices $loDevices..."
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losetup -d $loDevices
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fi
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cp /proc/mounts /dev/.mounts # don't read /proc/mounts while it's changing
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exec 4< /dev/.mounts
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while read -u 4 device mp fstype options rest; do
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# Skip various special filesystems. Non-existent
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# mount points are typically tmpfs/aufs mounts from
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# the initrd.
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if [ "$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
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echo "unmounting $mp..."
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# We need to remount,ro before attempting any
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# umount, or bind mounts may get confused, with
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# the fs not being properly flushed at the end.
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# `-i' is to workaround a bug in mount.cifs (it
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# doesn't recognise the `remount' option, and
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# instead mounts the FS again).
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success=
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if mount -t "$fstype" -n -i -o remount,ro "device" "$mp"; then success=1; fi
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# Note: don't use `umount -f'; it's very buggy.
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# (For instance, when applied to a bind-mount it
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# unmounts the target of the bind-mount.) !!! But
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# we should use `-f' for NFS.
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if [ "$mp" != / -a "$mp" != /nix -a "$mp" != /nix/store ]; then
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if umount -n "$mp"; then success=1; tryAgain=1; fi
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fi
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if [ -z "$success" ]; then failed="$failed $mp"; fi
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done
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done
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# Warn about filesystems that could not be unmounted or
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# remounted read-only.
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if [ -n "$failed" ]; then
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echo "[1;31mwarning:[0m the following filesystems could not be unmounted:"
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for mp in $failed; do echo " $mp"; done
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echo Enter 'i' to launch a shell, or wait 10 seconds to continue.
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read -t 10 A
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if [ "$A" == "i" ]; then
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${pkgs.bashInteractive}/bin/bash -i < /dev/console &> /dev/console
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fi
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sleep 5
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fi
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# Final sync.
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sync
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# Either reboot or power-off the system.
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if test "$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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