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Travis builds failing to install docker-engine version 1.9.1-0~trusty #253
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jmurty
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- remove customisation to install docker-engine version 1.9.1 in place of the Docker provided automatically by Travis - add `--cache-from` directive to docker build stage to take advantage of image caching.
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Related to #241 |
jmurty
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The `--pull` directive on `build` is unnecessary immediately after an explicit `docker pull`. This change isn't a big deal, but will trigger a Travis re-build as a nice side-effect.
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…ocker-engine-1.9 #253 travis failures installing docker engine 1.9
jmurty
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Per [1] Travis will do some autoamtic setup steps based on the kind of build, which for `python` builds seems to involve automatically installing our _requirements.txt_ file prior to running the Docker build process we actually want. See for example the `pip install -r requirements.txt` command executed in this build [2] that takes almost 100 seconds. This change overrides Travis's `install` step with a no-op directive. [1]: https://docs.travis-ci.com/user/customizing-the-build#Customizing-the-Installation-Step [2]: https://travis-ci.org/ic-labs/django-icekit/builds/245610276
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All Travis CI test builds currently fail with the error message
E: Version '1.9.1-0~trusty' for 'docker-engine' was not foundWe use the old version of docker-engine because it caches intermediate build artefacts, massively speeding up the build process, whereas newer versions of Docker to not do so (at least, not without the new/pending ``--cache-from` directive)
Travis customisation: https://github.com/ic-labs/django-icekit/blob/b3e7965/.travis.yml#L8
Example Travis build failure: https://travis-ci.org/ic-labs/django-icekit/builds/245583198
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