$ git clone -n https://src.fedoraproject.org/rpms/libigloo.git /var/lib/mock/f45-build-16399-486/root/chroot_tmpdir/scmroot/libigloo
Cloning into '/var/lib/mock/f45-build-16399-486/root/chroot_tmpdir/scmroot/libigloo'...
$ git fetch origin bb8ab7d4b1ae908d98b0fe804efcc18e2e870f12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libigloo
 * [new ref]         bb8ab7d4b1ae908d98b0fe804efcc18e2e870f12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb8ab7d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild