$ git clone -n https://src.fedoraproject.org/rpms/python-boto3.git /var/lib/mock/f40-build-2706379-71121/root/chroot_tmpdir/scmroot/python-boto3
Cloning into '/var/lib/mock/f40-build-2706379-71121/root/chroot_tmpdir/scmroot/python-boto3'...
$ git fetch origin f8fcdacf4e2569875748a8e32cade2e9189569bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-boto3
 * [new ref]         f8fcdacf4e2569875748a8e32cade2e9189569bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8fcdac 1.34.78