$ git clone -n https://src.fedoraproject.org/rpms/createrepo_c.git /var/lib/mock/f40-build-739971-109418/root/chroot_tmpdir/scmroot/createrepo_c
Cloning into '/var/lib/mock/f40-build-739971-109418/root/chroot_tmpdir/scmroot/createrepo_c'...
$ git fetch origin c77b2c5c87f96fd78848ff6d2244b44d32b3f132:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/createrepo_c
 * [new ref]         c77b2c5c87f96fd78848ff6d2244b44d32b3f132 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c77b2c5 Update to 1.0.2