[tahoe-lafs-trac-stream] [Tahoe-LAFS] #2963: Fedora package installation is unreliable and spuriously fails CI jobs

[Tahoe-LAFS]

#2963: Fedora package installation is unreliable and spuriously fails CI jobs
--------------------------------+---------------------------
 Reporter:  exarkun             |          Owner:
     Type:  defect              |         Status:  new
 Priority:  normal              |      Milestone:  undecided
Component:  dev-infrastructure  |        Version:  1.12.1
 Keywords:                      |  Launchpad Bug:
--------------------------------+---------------------------
 For example, seen on <https://circleci.com/gh/tahoe-lafs/tahoe-lafs/2136>,
 `yum install --assumeyes git` eventually fails like:

 {{{
 The downloaded packages were saved in cache until the next successful
 transaction.
 You can remove cached packages by executing 'dnf clean packages'.
 Error: Error downloading packages:
   Status code: 503 for https://mirrors.fedoraproject.org/metalink?repo
 =updates-released-f28&arch=x86_64
 Exited with code 1
 }}}

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/2963>
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