$ git clone -n https://src.fedoraproject.org/rpms/aws-c-cal.git /var/lib/mock/f41-build-856146-167459/root/chroot_tmpdir/scmroot/aws-c-cal
Cloning into '/var/lib/mock/f41-build-856146-167459/root/chroot_tmpdir/scmroot/aws-c-cal'...
$ git fetch origin bf21828bb5f6b514c15a1296bb527dddc616e969:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/aws-c-cal
 * [new ref]         bf21828bb5f6b514c15a1296bb527dddc616e969 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf21828 Update to 0.7.4 upstream release