abderrahim commented on PR #15:
URL: 
https://github.com/apache/buildstream-plugins/pull/15#issuecomment-1173542005

   > I'd note that the commit which avoids downloading crates at track time for 
which we already have a `sha` is a discrepancy in behavior when compared with 
sources like `tar`, which are expected to derive the `sha` from the remote 
unconditionally (and print a warning in the case that an existing `sha` is 
_changed_).
   
   Maybe I'll let your past self answer the question: 
https://gitlab.com/BuildStream/bst-external/-/merge_requests/157#note_836698782
   
   Either way, we don't use the sha that is already tracked (or at least, 
that's not the intent) but rather the sha that is available in the Cargo.lock 
file that we're using. To put it differently, we're tracking the Cargo.lock, 
not the remot..
   
   This is not exactly correct for tar either. tar has a shortcut that makes it 
not download unconditionally.


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