[Varnish] #1666: make init script check config before restarting

[Varnish]

#1666: make init script check config before restarting
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 Reporter:  KlavsKlavsen  |       Owner:  lkarsten
     Type:  defect        |      Status:  new
 Priority:  normal        |   Milestone:
Component:  build         |     Version:  unknown
 Severity:  normal        |  Resolution:
 Keywords:                |
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Comment (by gquintard):

 I looked at how to do it in systemd, and stumbled upon this thread :
 http://lists.freedesktop.org/archives/systemd-devel/2014-July/021633.html

 TL;DR : there no !ExecRestartPre/!ExecRestartCheck that would allow us to
 do it. Restart is just a stop and a start with no idea of context.

 Maybe we can tweak varnish_vcl_reload to have a dryrun/check/fake option
 that would just validate the vcl? However, that wouldn't catch errors in
 the command line, but I'm not sure anything can.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1666#comment:3>
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