mirror of
https://github.com/schoebel/mars
synced 2024-12-22 14:42:58 +00:00
37 lines
1.4 KiB
Desktop File
37 lines
1.4 KiB
Desktop File
[Unit]
|
|
Description=MARS per-resource trigger from /mars/resource-@{res}/systemd-trigger
|
|
Documentation=https://github.com/schoebel/mars/docu/mars-manual.pdf
|
|
|
|
## Prohibit parallelism with any daemon-reload
|
|
After=daemon-reload.service
|
|
|
|
## The per-resource trigger is the _only_ one which is allowed
|
|
## to remotely start / stop any units dealing with resources.
|
|
## Otherwise, races or conflicting start / stop operations might
|
|
## occur, leading to deadlocks / failures / etc.
|
|
##
|
|
## General rule: each *.path watcher can only start its corresponding
|
|
## *-trigger.service at most _once_ in parallel (provided that the actions
|
|
## caused by "marsadm systemd-trigger-extern" are not forking into background).
|
|
## So there is never any parallelism of _any_ unit with exactly _itself_
|
|
## (although _different_ units are allowed to run in parallel to each other,
|
|
## of course).
|
|
|
|
## Do not start both the global and any of the per-resource triggers
|
|
## in parallel.
|
|
## It could lead to various races between global and per-resource units.
|
|
## In contrast, different per-resource triggers are not mutually exclusive.
|
|
After=mars-trigger.service
|
|
|
|
[Service]
|
|
# Important for blocking parallelism with itself
|
|
Type=oneshot
|
|
RemainAfterExit=no
|
|
# Important for avoiding failures: do not send any signals
|
|
KillMode=none
|
|
# Important: the resource argument will keep remote triggers disjoint
|
|
ExecStart=/usr/bin/marsadm systemd-trigger-extern @{res}
|
|
|
|
[Install]
|
|
WantedBy=mars.service
|