[wp-trac] [WordPress Trac] #44858: Implement travis_retry to reduce the chance that network errors cause CI builds to fail

[WordPress Trac]

#44858: Implement travis_retry to reduce the chance that network errors cause CI
builds to fail
------------------------------+-----------------------------
 Reporter:  johnbillion       |      Owner:  (none)
     Type:  enhancement       |     Status:  new
 Priority:  low               |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:
 Severity:  minor             |   Keywords:  needs-patch
  Focuses:                    |
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 Travis CI has a `travis_retry` shell function that can be prefixed onto
 installation commands and cause them to retry up to three times in the
 event of a non-zero response.

 Let's implement this for all commands called during `before_install` and
 `before_script` that touch the network, for example the `svn` and
 `composer` commands. This will reduce the chance that a network issue will
 cause the build to fail.

 Ref: https://docs.travis-ci.com/user/common-build-problems/#timeouts-
 installing-dependencies

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Ticket URL: <https://core.trac.wordpress.org/ticket/44858>
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