$ git clone -n https://src.fedoraproject.org/rpms/libbase.git /var/lib/mock/f45-build-15888-480/root/chroot_tmpdir/scmroot/libbase
Cloning into '/var/lib/mock/f45-build-15888-480/root/chroot_tmpdir/scmroot/libbase'...
$ git fetch origin d9435bb7e3d095fc5e40a2edc681001523d0350f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libbase
 * [new ref]         d9435bb7e3d095fc5e40a2edc681001523d0350f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9435bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild