$ git clone -n https://src.fedoraproject.org/rpms/groonga.git /var/lib/mock/f45-build-13067-446/root/chroot_tmpdir/scmroot/groonga
Cloning into '/var/lib/mock/f45-build-13067-446/root/chroot_tmpdir/scmroot/groonga'...
$ git fetch origin cb08b66663c6e2e8c51e177a4e75787b27a98a72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/groonga
 * [new ref]         cb08b66663c6e2e8c51e177a4e75787b27a98a72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb08b66 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild