$ git clone -n https://src.fedoraproject.org/rpms/rvm.git /var/lib/mock/f45-build-35499-695/root/chroot_tmpdir/scmroot/rvm
Cloning into '/var/lib/mock/f45-build-35499-695/root/chroot_tmpdir/scmroot/rvm'...
$ git fetch origin a077fe9ccfd5253814d0fc46c41791023489e45d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rvm
 * [new ref]         a077fe9ccfd5253814d0fc46c41791023489e45d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a077fe9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild