tree 315d100c7148829c0629a36b8e82cfc223987f20
parent 11700c3787c136939a86da0d4a78140a4e197000
author James E. Blair <jeblair@hp.com> 1341595441 -0700
committer James E. Blair <jeblair@hp.com> 1341595917 -0700

Add graceful exit.

A SIGUSR1 will cause zuul to queue new events, wait for existing
jobs to finish, then save the queue and exit.

It will likely take quite a while to complete (perhaps an hour),
so it's not implemented as a SIGTERM handler.

Can be used in an init script to implement a graceful restart.

Change-Id: I09fce571e971f16b5d20c5d69d595a05c7f6a4ba