Pipeline/ stage material

[Togi Kiran Kumar]

Hey

Is there any way to Trigger stage automatically only when a specific file have changed

Thanks

[Chad Wilson]

Sure - there's at least two ways to go about this with some pros and cons.

1. Built-in: use "allowlists" (aka "includes" in some config repo plugins)
   
   This will trigger only if the filtered paths are changed in a commit. If you manually trigger the plugin it will use the latest commit, regardless of which files were changed. Commit histories/diffs will show unrelated commits.
   
   If you rely on "fan-in" flows between pipelines/materials that use the same git repo and different allowlists/includes - things may not work as you expect.
   
   
2. Plugin: use https://github.com/TWChennai/gocd-git-path-material-plugin (directly filters at a git level using git path expressions)
   
   If you manually trigger, will use the last commit ref that was affected by a commit - i.e automatic triggers and manual triggers are identical in semantics. Commit histories/diffs are filtered to show only commits that affect the given path expressions.
   
   Materials with different expressions are considered distinct and will not require/trigger fan-in, which can be a positive or a negative depending on your pipeline design.
   
   If you will have many hundreds of such pipelines, the extra load on your git repository server may be of concern, unless you use some kind of caching proxy, or use webhook triggers to avoid needing to poll.
   

-Chad

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