[tor-bugs] #25531 [Internal Services]: Add locks in archive.tpo rsync scripts

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#25531: Add locks in archive.tpo rsync scripts
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     Reporter:  boklm              |      Owner:  boklm
         Type:  defect             |     Status:  assigned
     Priority:  Medium             |  Milestone:
    Component:  Internal Services  |    Version:
     Severity:  Normal             |   Keywords:  boklm201803
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 We are using cron to run rsync every hour to update archive.tpo. It works
 fine, except when the rsync takes more than one hour, which cause multiple
 rsyncs to be running at the same time.

 We should avoid that by using flock/lckdo.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25531>
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