Fix #129: add pre:script and post:script action support

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This patch updates the service state machine with two new states: SETUP
and CLEANUP.  If an executable pre:/path/to/script is defined for a
service, it is called every time the task goes to READY state.  If an
executable post:/path/to/script is defined for a service, it is called
when the task goes to HALTED state.

Each of these two scripts default to a three (3) second execution time
before they are SIGKILLed.  This can be adjusted with the `kill:SEC`
option for the service.  There are no execution guarantees, nor are
there any way of detecting if the script was killed before completion or
not -- except for running Finit in debug mode and inspecting the result
printed by system_monitor().

Note: the post:script MUST be idempotent since transitions between READY
      and HALTED can take place any number of times before a task goes
      to its RUNNING state.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

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Joachim Wiberg committed 2021-04-18 11:33:38 +02:00

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commit ba858743e5

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+192 -46

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