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switch-to-configuration: Initial systemd support 

It reloads the configuration, but doesn't (re)start jobs yet.
This commit is contained in:
Eelco Dolstra 2012-07-20 18:25:36 -04:00
parent fd2cef50cd
commit 0edf138fc7
1 changed files with 4 additions and 80 deletions
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84
modules/system/activation/switch-to-configuration.sh
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@ -75,91 +75,15 @@ fi
# virtual console 1 and we restart the "tty1" job.
trap "" SIGHUP
jobsDir=$(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 "$jobsDir/$job.conf" ] ; then
echo "stopping obsolete job ‘$job’..."
stop --quiet "$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
# FIXME: Re-exec systemd if necessary.
# Allow Upstart jobs to react intelligently to a config change.
initctl emit config-changed
declare -A tasks=(@tasks@)
declare -A noRestartIfChanged=(@noRestartIfChanged@)
start_() {
local job="$1"
if start --quiet "$job"; then
# Handle services that cancel themselves.
if ! [ -n "${tasks[$job]}" ]; then
local status=$(status "$job")
[[ "$status" =~ start/running ]] || echo "job ‘$job’ failed to start!"
fi
fi
}
log() {
echo "$@" >&2 || true
}
# Restart all running jobs that have changed. (Here "running" means
# all jobs that don't have a "stop" goal.) We use the symlinks in
# /var/run/upstart-jobs (created by each job's pre-start script) to
# determine if a job has changed.
for job in @jobs@; do
status=$(status "$job")
if ! [[ "$status" =~ start/ ]]; then continue; fi
if [ "$(readlink -f "$jobsDir/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ]; then continue; fi
if [ -n "${noRestartIfChanged[$job]}" ]; then
log "not restarting changed service ‘$job’"
continue
fi
log "restarting changed service ‘$job’..."
# Note: can't use "restart" here, since that only restarts the
# job's main process.
stop --quiet "$job" || true
start_ "$job" || true
done
# Start all jobs that are not running but should be. The "should be"
# criterion is tricky: the intended semantics is that we end up with
# the same jobs as after a reboot. If it's a task, start it if it
# differs from the previous instance of the same task; if it wasn't
# previously run, don't run it. If it's a service, only start it if
# it has a "start on" condition.
for job in @jobs@; do
status=$(status "$job")
if ! [[ "$status" =~ stop/ ]]; then continue; fi
if [ -n "${tasks[$job]}" ]; then
if [ ! -e "/var/run/upstart-jobs/$job" -o \
"$(readlink -f "$jobsDir/$job.conf")" = "$(readlink -f "/var/run/upstart-jobs/$job")" ];
then continue; fi
if [ -n "${noRestartIfChanged[$job]}" ]; then continue; fi
log "starting task ‘$job’..."
start --quiet "$job" || true
else
if ! grep -q "^start on" "$jobsDir/$job.conf"; then continue; fi
log "starting service ‘$job’..."
start_ "$job" || true
fi
done
# Make systemd reload its jobs.
systemctl daemon-reload
# 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"
systemctl reload dbus.service || true