Conditions in Finit are dependencies: if A is asserted, service B is
allowed to run. When A goes through FLUX (e.g., upstream reloads),
dependents are PAUSED and then simply resumed when the condition is
reasserted -- this is the correct behavior for barrier-style deps
like <pid/syslogd>.
However, some setups have tightly coupled services where dependents
must be reloaded/restarted when an upstream service reloads, not just
resumed. E.g., the FRR routing stack on Infix OS:
netd <pid/mgmtd> ← zebra <!pid/netd> ← {staticd,ripd} <!pid/zebra>
When netd reloads (SIGHUP), zebra and its dependents must be restarted
to pick up the new configuration.
The new '~' condition prefix marks a dependency as flux-sensitive:
service <!~pid/netd> name:zebra ...
When the upstream condition goes FLUX and returns to ON, the dependent
is reloaded (SIGHUP) or restarted (noreload '!') instead of merely
resumed. Transitivity follows naturally through the condition chain.
Closes#416Closes#476
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
When 'initctl reload' is called after marking a service in a dependency
chain dirty, Finit fails to restart (unfreeze) affected services.
This patch updates the pidfile plugin to watch for IN_ATTRIB changes,
e.g. when a process uses utimensat() to update its pidfile, and adds
service_step_all() at end of reload cycle to guarantee convergence
after conditions are reasserted.
Issue #476
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Joachim Wiberg