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Document the logic around X-NotSocketActivated in the manual

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Andreas Fuchs 2024-12-09 08:57:47 -05:00
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15
nixos/doc/manual/development/unit-handling.section.md
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@ -58,11 +58,16 @@ checks:
before the activation script is run. This behavior is different when the
service is socket-activated, as outlined in the following steps.
- The last thing that is taken into account is whether the unit is a service
and socket-activated. If `X-StopIfChanged` is **not** set, the service
is **restart**ed with the others. If it is set, both the service and the
socket are **stop**ped and the socket is **start**ed, leaving socket
activation to start the service when it's needed.
- The last thing that is taken into account is whether the unit is a
service and socket-activated. A correspondence between a
`.service` and its `.socket` unit is detected automatically, but
services can **opt out** of that detection by setting
`X-NotSocketActivated` to `yes` in their `[Service]`
section. Otherwise, if `X-StopIfChanged` is **not** set, the
service is **restart**ed with the others. If it is set, both the
service and the socket are **stop**ped and the socket is
**start**ed, leaving socket activation to start the service when
it's needed.
## Sysinit reactivation {#sec-sysinit-reactivation}