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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: $0 [switch|boot|test]
switch: make the configuration the boot default and activate now
boot: make the configuration the boot default
test: activate the configuration, but don't make it the boot default
EOF
exit 1
fi
# Install or update the bootloader.
if [ "$action" = "switch" -o "$action" = "boot" ]; then
if [ "@bootLoader@" = "grub" ]; then
if [ -n "@grubDevices@" ]; then
mkdir -m 0700 -p /boot/grub
@menuBuilder@ @out@
# If the GRUB version has changed, then force a reinstall.
oldGrubVersion="$(cat /boot/grub/version 2>/dev/null || true)"
newGrubVersion="@grubVersion@"
if [ "$NIXOS_INSTALL_GRUB" = 1 -o "$oldGrubVersion" != "$newGrubVersion" ]; then
for dev in @grubDevices@; do
if [ "$dev" != nodev ]; then
echo "installing the GRUB bootloader on $dev..."
@grub@/sbin/grub-install "$(readlink -f "$dev")" --no-floppy
fi
done
echo "$newGrubVersion" > /boot/grub/version
fi
else
echo "Warning: don't know how to make this configuration bootable; please set \`boot.loader.grub.device'." 1>&2
fi
elif [ "@bootLoader@" = "generationsDir" ]; then
@menuBuilder@ @out@
elif [ "@bootLoader@" = "efiBootStub" ]; then
@menuBuilder@ @out@
else
echo "Warning: don't know how to make this configuration bootable; please enable a boot loader." 1>&2
fi
if [ -n "@initScriptBuilder@" ]; then
@initScriptBuilder@ @out@
fi
fi
# Activate the new configuration.
if [ "$action" != switch -a "$action" != test ]; then exit 0; fi
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
newJobs=$(readlink -f @out@/etc/init)
# Stop all currently running jobs that are not in the new Upstart
# configuration. (Here "running" means all jobs that are not in the
# stop/waiting state.)
for job in $(initctl list | sed -e '/ stop\/waiting/ d; /^[^a-z]/ d; s/^\([^ ]\+\).*/\1/' | sort); do
if ! [ -e "$newJobs/$job.conf" ] ; then
echo "stopping obsolete job ‘$job’..."
initctl stop "$job" || true
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 jobs.
initctl reload-configuration
# Allow Upstart jobs to react intelligently to a config change.
initctl emit config-changed
# Restart all running jobs that have changed. (Here "running" means
# all jobs that don't have a "stop" goal.) We use the symlinks in
# /var/run/upstart-jobs (created by each job's pre-start script) to
# determine if a job has changed.
for job in $(cd $newJobs && ls *.conf); do
job=$(basename $job .conf)
status=$(status "$job")
if ! [[ "$status" =~ start/ ]]; then continue; fi
if [ "$(readlink -f "$newJobs/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ]; then continue; fi
# Hack: don't restart the X server (that would kill all the clients).
# And don't restart dbus, since that causes ConsoleKit to
# forget about current sessions.
# Idem for xendomains because we don't want to save/restore
# Xen domains unless we have to.
# TODO: Jobs should be able to declare that they should not be
# auto-restarted.
if echo "$job" | grep -q "^xserver$\|^dbus$\|^disnix$\|^xendomains$\|^udevtrigger$"; then
echo "not restarting changed service ‘$job’"
continue
fi
echo "restarting changed service ‘$job’..."
# Note: can't use "restart" here, since that only restarts the
# job's main process.
stop "$job" || true
start "$job" || true
done
# Start all jobs that are not running but should be. The "should be"
# criterion is tricky: the intended semantics is that we end up with
# the same jobs as after a reboot. If it's a task, restart it if it
# differs from the previous instance of the same task; if it wasn't
# previously run, don't run it. If it's a service, only start it if
# it has a "start on" condition.
for job in $(cd $newJobs && ls *.conf); do
job=$(basename $job .conf)
status=$(status "$job")
if ! [[ "$status" =~ stop/ ]]; then continue; fi
if grep -q '^task$' "$newJobs/$job.conf"; then
if [ ! -e "/var/run/upstart-jobs/$job" -o \
"$(readlink -f "$newJobs/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ];
then continue; fi
echo "starting task ‘$job’..."
start "$job" || true
else
if ! grep -q "^start on" "$newJobs/$job.conf"; then continue; fi
echo "starting service ‘$job’..."
start "$job" || true
fi
done
# Signal dbus to reload its configuration.
dbusPid=$(initctl status dbus 2> /dev/null | sed -e 's/.*process \([0-9]\+\)/\1/;t;d')
[ -n "$dbusPid" ] && kill -HUP "$dbusPid"
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