nixpkgs/system/switch-to-configuration.sh
Eelco Dolstra d9f4475dd5 * Be able to cope with future changes to Upstart.
svn path=/nixos/trunk/; revision=15312
2009-04-25 22:36:56 +00:00

100 lines
3.0 KiB
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#! @shell@
set -e
export PATH=/empty
for i in @path@; do PATH=$PATH:$i/bin:$i/sbin; done
action="$1"
if ! test -e /etc/NIXOS; then
echo "This is not a NixOS installation (/etc/NIXOS) is missing!"
exit 1
fi
if test -z "$action"; then
cat <<EOF
Usage: $0 [switch|boot|test]
switch: make the configuration the boot default and activate now
boot: make the configuration the boot default
test: activate the configuration, but don't make it the boot default
EOF
exit 1
fi
if test "$action" = "switch" -o "$action" = "boot"; then
if test -n "@grubDevice@"; then
mkdir -m 0700 -p /boot/grub
@grubMenuBuilder@ @out@
if test "$NIXOS_INSTALL_GRUB" = 1; then
@grub@/sbin/grub-install "@grubDevice@" --no-floppy --recheck
fi
else
echo "Warning: don't know how to make this configuration bootable; please set \`boot.grubDevice'." 1>&2
fi
fi
if test "$action" = "switch" -o "$action" = "test"; then
oldVersion=$(cat /var/run/current-system/upstart-interface-version 2> /dev/null || echo 0)
newVersion=$(cat @out@/upstart-interface-version 2> /dev/null || echo 0)
if test "$oldVersion" -ne "$newVersion"; then
cat <<EOF
Warning: the new NixOS configuration has an Upstart version that is
incompatible with the current version. The new configuration won't
take effect until you reboot the system.
EOF
exit 1
fi
oldEvents=$(readlink -f /etc/event.d || true)
newEvents=$(readlink -f @out@/etc/event.d)
echo "old: $oldEvents"
echo "new: $newEvents"
stopJob() {
local job=$1
initctl stop "$job"
while ! initctl status "$job" 2>&1 | grep -q "(stop) waiting"; do
echo "waiting for $job to stop..."
sleep 1
done
}
# Stop all services that are not in the new Upstart
# configuration.
for event in $(cd $oldEvents && ls); do
if ! test -e "$newEvents/$event"; then
echo "stopping $event..."
stopJob $event
fi
done
# Activate the new configuration (i.e., update /etc, make
# accounts, and so on).
echo "Activating the configuration..."
@out@/activate @out@
# Make Upstart reload its events. !!! Should wait until it has
# finished processing its stop events.
kill -TERM 1
# Start all new services and restart all changed services.
for event in $(cd $newEvents && ls); do
# Hack: skip the sys-* and ctrl-alt-delete events.
# Another hack: don't restart the X server (that would kill all the clients).
if echo "$event" | grep -q "^sys-\|^ctrl-\|^xserver\|^dbus"; then continue; fi
if ! test -e "$oldEvents/$event"; then
echo "starting $event..."
initctl start "$event"
elif test "$(readlink "$oldEvents/$event")" != "$(readlink "$newEvents/$event")"; then
echo "restarting $event..."
stopJob $event
initctl start "$event"
fi
done
fi