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## CI Scripts
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This directory contains scripts for each build step in each build stage.
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### Running a Stage Locally
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Be aware that the tests will be built and run in-place, so please run at your own risk.
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If the repository is not a fresh git clone, you might have to clean files from previous builds or test runs first.
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The ci needs to perform various sysadmin tasks such as installing packages or writing to the user's home directory.
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While it should be fine to run
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the ci system locally on you development box, the ci scripts can generally be assumed to have received less review and
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testing compared to other parts of the codebase. If you want to keep the work tree clean, you might want to run the ci
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system in a virtual machine with a Linux operating system of your choice.
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To allow for a wide range of tested environments, but also ensure reproducibility to some extent, the test stage
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requires `bash`, `docker`, and `python3` to be installed. To install all requirements on Ubuntu, run
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```
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sudo apt install bash docker.io python3
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```
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To run the default test stage,
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```
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./ci/test_run_all.sh
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```
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To run the test stage with a specific configuration,
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```
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FILE_ENV="./ci/test/00_setup_env_arm.sh" ./ci/test_run_all.sh
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```
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### Configurations
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The test files (`FILE_ENV`) are constructed to test a wide range of
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configurations, rather than a single pass/fail. This helps to catch build
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failures and logic errors that present on platforms other than the ones the
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author has tested.
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Some builders use the dependency-generator in `./depends`, rather than using
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the system package manager to install build dependencies. This guarantees that
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the tester is using the same versions as the release builds, which also use
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`./depends`.
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If no `FILE_ENV` has been specified or values are left out, `00_setup_env.sh`
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is used as the default configuration with fallback values.
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It is also possible to force a specific configuration without modifying the
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file. For example,
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```
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MAKEJOBS="-j1" FILE_ENV="./ci/test/00_setup_env_arm.sh" ./ci/test_run_all.sh
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```
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The files starting with `0n` (`n` greater than 0) are the scripts that are run
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in order.
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### Cache
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In order to avoid rebuilding all dependencies for each build, the binaries are
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cached and re-used when possible. Changes in the dependency-generator will
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trigger cache-invalidation and rebuilds as necessary.
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