Is it possible to run a pipeline thanks to Gitlab CI/CD after a branch is deleted.
In fact I want to edit file after that branch is removed.
For example, I have two repositories, R1 and R2.
In R1 I have 2 branches
I want to edit a file from R2 when B1 (which is a R1's branch) is removed.
I know how to access and edit the file but I don't know how can I set a trigger for removed branch.
You can use environments. Look at Stopping an environment.
GitLab will automatically trigger a stop action when the associated branch is deleted. The stop_review job must be in the same stage as the deploy_review job in order for the environment to automatically stop.
deploy_review:
stage: deploy
script:
- echo "Deploy a review app"
environment:
name: review/$CI_COMMIT_REF_NAME
url: https://$CI_ENVIRONMENT_SLUG.example.com
on_stop: stop_review
only:
- branches
except:
- master
stop_review:
stage: deploy
variables:
GIT_STRATEGY: none
script:
- echo "Implement editing files from R2 here"
when: manual
environment:
name: review/$CI_COMMIT_REF_NAME
action: stop
It's not fully what you want, but maybe more useful for you.
It is not possible for the pipeline to know when you deleted a branch either via the UI nor via git branch -r -D. Pipelines run as a commit hook on the gitlab server (when you push), and when you click the Run Pipeline button manually in the UI.
That being said, it is possible to delete a branch from a pipeline job, so while I will leave it up to you to determine how you wish to do that, you can add a job that uses the trigger keyword to trigger a pipeline in R2 after a job in your R1 pipeline deletes the branch.
See the trigger docs: https://docs.gitlab.com/ee/ci/yaml/index.html#trigger and look into multi-project pipelines.
So in R2 you have a pipeline which is setup to edit some file In R1, then you would setup a job that deletes the B1 branch and follow that job with a "trigger job" which runs in R1 and sends a command to the Gitlab API to kick off the pipeline in R2.