$ git clone -n https://src.fedoraproject.org/rpms/libijs.git /var/lib/mock/f45-build-16394-486/root/chroot_tmpdir/scmroot/libijs
Cloning into '/var/lib/mock/f45-build-16394-486/root/chroot_tmpdir/scmroot/libijs'...
$ git fetch origin 3c6bf347426a8388dea667a2fac09b1eb3fe48f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libijs
 * [new ref]         3c6bf347426a8388dea667a2fac09b1eb3fe48f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c6bf34 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild