[MacPorts] #58800: Buildbot should wait until the clock catches up to the Portfiles

[MacPorts]

#58800: Buildbot should wait until the clock catches up to the Portfiles
---------------------------+---------------------
 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  enhancement    |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 Apparently some of the buildbot workers' clocks run a little fast. This
 has happened a few times: a buildbot worker goes down due to a power
 outage or for some other reason needs to be restarted, and after it
 restarts its clock re-syncs with the time server and now time has moved a
 few minutes backwards. If builds were queued up and start immediately, the
 [https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/61386/steps
 /install-port/logs/stdio builds fail with a message]:

 {{{
 Error: Portfile is from the future - check date and time of your system
 }}}

 It might be nice if the buildbot would wait until the clock catches up
 with the timestamp of the Portfile before trying to build, though it needs
 to check the timestamps of all dependencies to be truly effective. It's
 probably simpler if we record the timestamp when we sync the ports tree
 (by touching some file, or maybe there is already some file that gets
 touched whose timestamp we can use), and then wait until the clock is
 equal to or greater than that timestamp before allowing the build to
 proceed.

-- 
Ticket URL: <https://trac.macports.org/ticket/58800>
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