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5 Commits

Author SHA1 Message Date
Henri Chain
596e447076 Reintroduce ExitType
This introduces `ExitType=main|cgroup` for services.
Similar to how `Type` specifies the launch of a service, `ExitType` is
concerned with how systemd determines that a service exited.

- If set to `main` (the current behavior), the service manager will consider
  the unit stopped when the main process exits.

- The `cgroup` exit type is meant for applications whose forking model is not
  known ahead of time and which might not have a specific main process.
  The service will stay running as long as at least one process in the cgroup
  is running. This is intended for transient or automatically generated
  services, such as graphical applications inside of a desktop environment.

Motivation for this is #16805. The original PR (#18782) was reverted (#20073)
after realizing that the exit status of "the last process in the cgroup" can't
reliably be known (#19385)

This version instead uses the main process exit status if there is one and just
listens to the cgroup empty event otherwise.

The advantages of a service with `ExitType=cgroup` over scopes are:
- Integrated logging / stdout redirection
- Avoids the race / synchronisation issue between launch and scope creation
- More extensive use of drop-ins and thus distro-level configuration:
  by moving from scopes to services we can have drop ins that will affect
  properties that can only be set during service creation,
  like `OOMPolicy` and security-related properties
- It makes systemd-xdg-autostart-generator usable by fixing [1], as obviously
  only services can be used in the generator, not scopes.

[1] https://bugs.kde.org/show_bug.cgi?id=433299
2021-11-08 10:15:23 +01:00
Zbigniew Jędrzejewski-Szmek
abaf5edd08 Revert "Introduce ExitType"
This reverts commit cb0e818f7c.

After this was merged, some design and implementation issues were discovered,
see the discussion in #18782 and #19385. They certainly can be fixed, but so
far nobody has stepped up, and we're nearing a release. Hopefully, this feature
can be merged again after a rework.

Fixes #19345.
2021-06-30 21:56:47 +02:00
Henri Chain
cb0e818f7c Introduce ExitType 2021-03-31 10:26:07 +02:00
Yu Watanabe
1ebcf47296 test: merge udev tests 2021-03-05 18:36:04 +09:00
Anita Zhang
e4ff80404a test: add basic memory pressure extended test for oomd
Simple test to generate a lot of pressure in one unit and assert that
systemd-oomd kills the right one.
2020-10-22 17:04:22 -07:00