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finit/doc/service.md
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Joachim Wiberg b3ea23ed26 initctl: drop old 'job:id' format support, canonical is 'name:id'
With the recent changes to the condition handling it has become more and
more evident that the canonical reference for a task/run/service is the
NAME:ID representation.  Up until now we've kept the older JOB:ID for
some sort of compatibility fallback.

This patch removes the support to simplify maintenance going forward.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
2021-03-04 07:23:19 +01:00

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1.1 KiB
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Finit Services
==============
![The service state machine](svc-machine.png "The service state machine")
State Machine
-------------
A service is bound to a state machine that is in one of six (6) states.
For `run`s and `task`s there is an additional end state called `DONE`,
not shown in the diagram for brevity. Services start in the `HALTED`
state.
The current state depends on the two following conditions:
* `E`: Service enabled. In order for `E` to be satisfied, the service
must be allowed to run in the current runlevel and not be stopped.
A service may be stopped, or blocked, for several reasons:
- The user has manually stopped the service using `initctl stop NAME`
- The program exits immediately. I.e. keeps crashing (make sure to use
the 'run this service in the foreground' command line option)
- The binary is missing in the filesystem
* `C`: Service conditions are satisfied:
- `on` (+): The condition is asserted.
- `off` (-): The condition is deasserted.
- `flux` (~): The condition state is unknown.
For a detailed description of conditions, and how to debug them,
see the [Finit Conditions](conditions.md) document.