136 lines
4.3 KiB
Bash
136 lines
4.3 KiB
Bash
#! @shell@
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set -e
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export PATH=/empty
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for i in @path@; do PATH=$PATH:$i/bin:$i/sbin; done
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action="$1"
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if ! test -e /etc/NIXOS; then
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echo "This is not a NixOS installation (/etc/NIXOS) is missing!"
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exit 1
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fi
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if test -z "$action"; then
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cat <<EOF
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Usage: $0 [switch|boot|test]
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switch: make the configuration the boot default and activate now
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boot: make the configuration the boot default
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test: activate the configuration, but don't make it the boot default
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EOF
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exit 1
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fi
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# Install or update the bootloader.
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if [ "$action" = "switch" -o "$action" = "boot" ]; then
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@installBootLoader@ @out@
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fi
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# Activate the new configuration.
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if [ "$action" != switch -a "$action" != test ]; then exit 0; fi
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oldVersion=$(cat /run/current-system/upstart-interface-version 2> /dev/null || echo 0)
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newVersion=$(cat @out@/upstart-interface-version 2> /dev/null || echo 0)
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if test "$oldVersion" -ne "$newVersion"; then
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cat <<EOF
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Warning: the new NixOS configuration has an Upstart version that is
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incompatible with the current version. The new configuration won't
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take effect until you reboot the system.
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EOF
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exit 1
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fi
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# Ignore SIGHUP so that we're not killed if we're running on (say)
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# virtual console 1 and we restart the "tty1" job.
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trap "" SIGHUP
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jobsDir=$(readlink -f @out@/etc/init)
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# Stop all currently running jobs that are not in the new Upstart
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# configuration. (Here "running" means all jobs that are not in the
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# stop/waiting state.)
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for job in $(initctl list | sed -e '/ stop\/waiting/ d; /^[^a-z]/ d; s/^\([^ ]\+\).*/\1/' | sort); do
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if ! [ -e "$jobsDir/$job.conf" ] ; then
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echo "stopping obsolete job ‘$job’..."
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stop --quiet "$job" || true
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fi
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done
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# Activate the new configuration (i.e., update /etc, make accounts,
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# and so on).
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echo "activating the configuration..."
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@out@/activate @out@
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# Make Upstart reload its jobs.
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initctl reload-configuration
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# Allow Upstart jobs to react intelligently to a config change.
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initctl emit config-changed
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declare -A tasks=(@tasks@)
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declare -A noRestartIfChanged=(@noRestartIfChanged@)
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start_() {
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local job="$1"
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if start --quiet "$job"; then
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# Handle services that cancel themselves.
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if ! [ -n "${tasks[$job]}" ]; then
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local status=$(status "$job")
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[[ "$status" =~ start/running ]] || echo "job ‘$job’ failed to start!"
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fi
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fi
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}
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log() {
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echo "$@" >&2 || true
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}
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# Restart all running jobs that have changed. (Here "running" means
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# all jobs that don't have a "stop" goal.) We use the symlinks in
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# /var/run/upstart-jobs (created by each job's pre-start script) to
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# determine if a job has changed.
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for job in @jobs@; do
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status=$(status "$job")
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if ! [[ "$status" =~ start/ ]]; then continue; fi
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if [ "$(readlink -f "$jobsDir/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ]; then continue; fi
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if [ -n "${noRestartIfChanged[$job]}" ]; then
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log "not restarting changed service ‘$job’"
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continue
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fi
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log "restarting changed service ‘$job’..."
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# Note: can't use "restart" here, since that only restarts the
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# job's main process.
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stop --quiet "$job" || true
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start_ "$job" || true
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done
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# Start all jobs that are not running but should be. The "should be"
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# criterion is tricky: the intended semantics is that we end up with
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# the same jobs as after a reboot. If it's a task, start it if it
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# differs from the previous instance of the same task; if it wasn't
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# previously run, don't run it. If it's a service, only start it if
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# it has a "start on" condition.
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for job in @jobs@; do
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status=$(status "$job")
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if ! [[ "$status" =~ stop/ ]]; then continue; fi
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if [ -n "${tasks[$job]}" ]; then
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if [ ! -e "/var/run/upstart-jobs/$job" -o \
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"$(readlink -f "$jobsDir/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ];
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then continue; fi
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if [ -n "${noRestartIfChanged[$job]}" ]; then continue; fi
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log "starting task ‘$job’..."
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start --quiet "$job" || true
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else
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if ! grep -q "^start on" "$jobsDir/$job.conf"; then continue; fi
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log "starting service ‘$job’..."
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start_ "$job" || true
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fi
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done
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# Signal dbus to reload its configuration.
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dbusPid=$(initctl status dbus 2> /dev/null | sed -e 's/.*process \([0-9]\+\)/\1/;t;d')
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[ -n "$dbusPid" ] && kill -HUP "$dbusPid"
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