Travis CI upgraded the linux build environment from Ubuntu Precise
to Ubuntu Trusty with Trusty becoming the default build environment
as of August 2017:
https://docs.travis-ci.com/user/reference/overview/
A bug in the configuration of the Ubuntu Trusty distro causes all
builds except nightly to fail. The PHP include_path is set to
include_path='.:/home/travis/.phpenv/versions/5.6.31/share/pear'
instead of
include_path='.:/home/travis/.phpenv/versions/5.6.31/lib/php/pear'
which causes phpcs to fail because it cannot resolve import paths.
This commit adds a hotfix to .travis.yml that circumvents the
issue by overwriting the include_path during initialization. This
hotfix should be removed once a solution is found.
This bug is tracked via
https://github.com/travis-ci/travis-ci/issues/8487
Travis CI recently updated the default distribution from Ubuntu
Precise to Ubuntu Trusty, which causes all builds except nightly
to fail.
For unknown reasons phpcs is unable to locate "PHP/CodeSniffer/
autoload.php" causing it to fail with a fatal error
The root cause of the failure is unknown. We explicitly return to
the previous build system (Ubuntu Precise) for builds to work again.
See the migration guide for reference:
https://docs.travis-ci.com/user/precise-to-trusty-migration-guide/
Notice: Ubuntu Precise is retired as of September 2017 and will be
decommissioned in the near future:
https://docs.travis-ci.com/user/reference/overview/
