forked from mirrors/nixpkgs
81 lines
1.9 KiB
Nix
81 lines
1.9 KiB
Nix
{bash, event, utillinux}:
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assert event == "reboot"
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|| event == "halt"
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|| event == "system-halt"
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|| event == "power-off";
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{
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name = "sys-" + event;
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job = "
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start on ${event}
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script
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exec < /dev/tty1 > /dev/tty1 2>&1
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echo \"\"
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echo \"<<< SYSTEM SHUTDOWN >>>\"
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echo \"\"
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export PATH=${utillinux}/bin:${utillinux}/sbin:$PATH
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# Do an initial sync just in case.
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sync || true
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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 $mp...\"
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if umount -f -n \"$mp\"; then
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if test \"$mp\" != /; then tryAgain=1; fi
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else
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mount -n -o remount,ro \"$mp\" || true
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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\" || true
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fi
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done
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done
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cat /proc/mounts
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# Final sync.
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sync || true
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# Right now all events above power off the system.
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if test ${event} = reboot; then
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exec reboot -f
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else
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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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