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# Add overlays for your pull requests in this directory
When your pull request breaks an external project we test in our CI and you
have prepared a branch with the fix, you can add an "overlay" to your pull
request to test it with the adapted version of the external project.
An overlay is a file which defines where to look for the patched version so that
testing is possible. It redefines some variables from
[`ci-basic-overlay.sh`](../ci-basic-overlay.sh):
give the name of your branch / commit using a `_CI_REF` variable and the
location of your fork using a `_CI_GITURL` variable.
The `_CI_GITURL` variable should be the URL of the repository without a
trailing `.git`.
If the fork is not on the same platform (e.g. GitHub instead of GitLab), it is
necessary to redefine the `_CI_ARCHIVEURL` variable as well.
Moreover, the file contains very simple logic to test the pull request number
or branch name and apply it only in this case.
The name of your overlay file should start with a five-digit pull request
number, followed by a dash, anything (for instance your GitHub nickname
and the branch name), then a `.sh` extension (`[0-9]{5}-[a-zA-Z0-9-_]+.sh`).
Example: `00669-maximedenes-ssr-merge.sh` containing
```
#!/bin/sh
if [ "$CI_PULL_REQUEST" = "669" ] || [ "$CI_BRANCH" = "ssr-merge" ]; then
mathcomp_CI_REF=ssr-merge
mathcomp_CI_GITURL=https://github.com/maximedenes/math-comp
fi
```
(`CI_PULL_REQUEST` and `CI_BRANCH` are set in [`ci-common.sh`](../ci-common.sh))
### Branching conventions
We suggest you use the convention of identical branch names for the
Coq branch and the CI project branch used in the overlay. For example,
if your Coq PR is coming from the branch `more_efficient_tc`, and that
breaks `ltac2`, we suggest you create a `ltac2` overlay with a branch
named `more_efficient_tc`.
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