On Wed, 21 Oct 2020 13:26:25 +0000 "Laurent Bercot" <ska-supervis...@skarnet.org> wrote:
> "A is ready" means: > - if A is a oneshot: when the script has completed > - if A is a longrun: > * if there is a notification-fd file in the service definition > directory: when the daemon has notified readiness > * if there is no such file: as soon as the run script has started > (which is not a good readiness indicator; it is akin to starting B > _right after A_, essentially in parallel, so you may have race > conditions here - which is why you should always use readiness > notifications.) I seem to remember that s6 also has specially named shellscript to determine dependency readiness. So, for instance, process B requires a functioning network, the shellscript would contain a ping command or an ip command. I do this all the time, informally. SteveT Steve Litt Autumn 2020 featured book: Thriving in Tough Times http://www.troubleshooters.com/thrive
