[update-checkout] Gracefully degrade timestamp matching. #81654
Merged
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Previously, when invoking the script with match-timestamp, if the refspec was absent, the find_rev_by_timestamp function would throw an exception and the script would hang forever.
Here, it is first checked via
git rev-parse --verify $REFSPEC
that the refspec actually exists in the target repo. If it does not, the refspec is just omitted from the command, giving the latest commit before the currently checked out one.