We have 200+ repositories each with individual Jenkinsfiles, we are in the process of update the agent definitions, and build steps (not planned to be done at the same time, due to priority!) and we can foresee more changes that will have to rolled out too all the repos, I know we could convert these to be using shared library, but this is for now not a solution!
So my only idea is to loop through all the repos, load the Jenkins file into a library structure and do my thing before writing it to the file again, the problem is here I cannot seems to find any good examples on how to do this, so do anybody have a solution for this problem.
If you want to iterate through all the repositories and update the Jenkinsfiles, you could maybe achieve this by writing a script or a pipeline job in Jenkins.
Here’s a high-level, untested, out of my head, surely flawed, approach you could try:
Create a Jenkins pipeline job: Set up a Jenkins pipeline job that will be responsible for iterating through the repositories and updating the Jenkinsfiles. This job can be configured to run periodically or triggered manually.
Git repository iteration: Use the Jenkins Git plugin, gh, or a command-line Git client within your Jenkins pipeline script to iterate through each Git repository. You can either maintain a list of repository URLs or use a pattern to identify the repositories.
Clone the repository: For each repository, use the Git plugin/gh/a Git client to clone the repository locally in your Jenkins pipeline script. This should give you access to the Jenkinsfile within each repository.
Read and modify the Jenkinsfile: Once the repository is cloned, read the content of the Jenkinsfile into memory within your Jenkins pipeline script. You can use standard file manipulation techniques or a Groovy-based library like the readFile step in Jenkins to accomplish this.
Perform modifications: Apply your desired modifications to the Jenkinsfile using string manipulation, regular expressions, awk/sed, or any other suitable techniques. This could include updating agent definitions, build steps, or any other changes you need.
Write the modified Jenkinsfile: After applying the modifications, write the updated Jenkinsfile back to the repository using file manipulation techniques or the writeFile step in Jenkins.
Commit and push changes: Use Git/gh/Git plugin to commit the changes made to the Jenkinsfile and push them back to the Git repository.
Repeat for other repositories: Repeat steps 3-7 for each repository you want to update. The iteration could be done using a loop in your Jenkins pipeline script.
