$ git clone -n https://src.fedoraproject.org/rpms/python-s3transfer.git /var/lib/mock/f39-build-1453466-32883/root/chroot_tmpdir/scmroot/python-s3transfer
Cloning into '/var/lib/mock/f39-build-1453466-32883/root/chroot_tmpdir/scmroot/python-s3transfer'...
$ git fetch origin c88f02c54ddbfc7c20779838c8468e50536f330e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-s3transfer
 * [new ref]         c88f02c54ddbfc7c20779838c8468e50536f330e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c88f02c 0.7.0