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systemd: support X-RestartIfChanged = false

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Having this in the unit file will prevent the file from being
restarted if a change is detected. This is useful if data loss may
occur if the unit is suddenly restarted. For example, restarting the
Emacs service may result in the loss of unsaved open buffers.
This commit is contained in:
Robert Helgesson 2019-04-14 02:04:52 +02:00
parent 0d246aa435
commit 6b42bd7abf
No known key found for this signature in database
GPG Key ID: 36BDAA14C2797E89
1 changed files with 15 additions and 4 deletions
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19
modules/systemd-activate.rb
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@ -41,11 +41,13 @@ def setup_services(old_gen_path, new_gen_path, start_timeout_ms_string)
raise "daemon-reload failed" unless run_cmd('systemctl --user daemon-reload')
# Exclude services that aren't allowed to be manually started or stopped
no_manual_start, no_manual_stop = get_restricted_units(to_stop + to_restart + to_start)
to_stop -= no_manual_stop
to_restart -= no_manual_stop + no_manual_start
no_manual_start, no_manual_stop, no_restart = get_restricted_units(to_stop + to_restart + to_start)
to_stop -= no_manual_stop + no_restart
to_restart -= no_manual_stop + no_manual_start + no_restart
to_start -= no_manual_start
puts "Not restarting: #{no_restart.join(' ')}" unless no_restart.empty?
if to_stop.empty? && to_start.empty? && to_restart.empty?
print_service_msg("All services are already running", services_to_run)
else
@ -154,6 +156,7 @@ def get_restricted_units(units)
units = units.to_a
infos = `systemctl --user show -p RefuseManualStart -p RefuseManualStop #{units.shelljoin}`
.split("\n\n")
no_restart = []
no_manual_start = []
no_manual_stop = []
infos.zip(units).each do |info, unit|
@ -161,7 +164,15 @@ def get_restricted_units(units)
no_manual_start << unit if no_start.end_with?('yes')
no_manual_stop << unit if no_stop.end_with?('yes')
end
[no_manual_start, no_manual_stop]
# Regular expression that indicates that a service should not be
# restarted even if a change has been detected.
restartRe = /^[ \t]*X-RestartIfChanged[ \t]*=[ \t]*false[ \t]*(?:#.*)?$/
units.each do |unit|
if `systemctl --user cat #{unit.shellescape}` =~ restartRe
no_restart << unit
end
end
[no_manual_start, no_manual_stop, no_restart]
end
def wait_and_get_failed_services(services, start_timeout_ms)