Tools for working inside Gitlab CI
Scripts for getting useful information (e.g. the git hash of the last successful build) from within Gitlab CI
Often when using Gitlab CI you need information that is not available from the environment variables provided by the CI runner. This package contains a collection of scripts for obtaining information from the Gitlab API
gitlab-ci-tools is licensed under the simplfied (2-clause) BSD licence. See the LICENSE file for details.
The scripts are written in Python 3, so this will need to be installed prior to the following:
pip3 install gitlab-ci-tools
You can install the package on your local computer to test out the scripts (see the Usage section for details), however typically you will want to install this package into the Gitlab CI environment.
The simplest way to accomplish this is to add the following to the top of your .gitlab-ci.yml:
before_script: - pip3 install gitlab-ci-tools
Installing gitlab-ci-tools installs a bunch of scripts that you can run from the command line. See the next section for a list of the installed tools.
In order for the scripts to be able to access the Gitlab API you must provide a CI secret variable GITLAB_API_TOKEN that contains a personal access token with api scope (check out these instructions to find out how to generate one).
Unfortunately Gitlab’s API permissions are not very granular, so anyone with access to this token is, effectively, you (at least as far as Gitlab is concerned). If people you don’t trust have access to your CI (e.g. they can make CI-triggering commits to your repository) this is a bad idea. There are several outstanding issues on Gitlab (e.g. #29566 and #41084) that attempt to address the problem of authenticated API access from within CI runners.
List of Tools
Print the Git hash of the last successful build for the current branch. An useful example would be generating a PDF of the diff between two Latex documents:
before_script: pip install gitlab-ci-tools LAST_GOOD_BUILD=$(last-good-build || echo '') report diff: script: - git show $LAST_GOOD_BUILD:important_doc.tex > old_doc.tex - latexdiff old_doc.tex important_doc.tex > diff_doc.tex - latexmk -pdf diff_doc.tex artifacts: paths: - diff_doc.pdf
I would be happy to add more tools here, not just ones that I find useful. It would be good if the script were to follow a similar structure to the existing ones (i.e. provide a main() function, and expose a command line that can be driven with command-line options or with environment variables), but I am happy to guide anyone through this process if need be.
Once there is more than a single script we can start to think about how best to separate out common functionlity so that we can reduce boilerplate.
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