[GitHub] [buildstream] jjardon commented on pull request #1537: Override project defined source mirrors, and be selective about what mirrors to use

[GitBox <gi...@apache.org>]

jjardon commented on pull request #1537:
URL: https://github.com/apache/buildstream/pull/1537#issuecomment-1004795650


   > As it was questioned in #1542, should we:
   > 
   >     * Remove the strange behavior of traversing active mirrors/URLs backwards when tracking ?
   > 
   >     * Make the default track source policy be to ignore mirrors and track only from the originally defined aliases ?
   >       
   >       * This would IMO address the concern that we _want_ to track upstream by default even though we want to _fetch_ from our own mirrors, in order to ensure we get new refs from upstream even when our downstream mirroring solutions might be lagging behind or broken
   
   I can see we want to get upstream to get the latest, but then we have another problem if we use a tag that is not in our mirror as next build fetch will fail (if we restrict your project to only use mirrors, for example)
   
   So, I think default should be always be (for both track and fetch):
   - 1. Try to use mirror
   - 2. Try to use upstream
   
   but that order should be configurable separately for track and fetch, so you can select the behaviour you want for your project
   
   


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