Do not assume all 40 char strings are SHA1s (#14624) #14648
Merged
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Backport #14624
GetCommit() assumes that all 40 char strings are SHA1s. This leads to an
error if you try to do a PR on a branch which is 40 characters long.
This PR attempts the SHA first - and if it fails will switch to using rev-parse.
Fix #14470
Fix #14420
Signed-off-by: Andrew Thornton art27@cantab.net