$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f43-build-side-110818-59104173-6571117/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f43-build-side-110818-59104173-6571117/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin 51651ba9436c427e632d1078ef40b230eae52627:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         51651ba9436c427e632d1078ef40b230eae52627 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51651ba 1.38.3