$ git clone -n https://src.fedoraproject.org/rpms/wildmagic5.git /var/lib/mock/f45-build-38408-724/root/chroot_tmpdir/scmroot/wildmagic5
Cloning into '/var/lib/mock/f45-build-38408-724/root/chroot_tmpdir/scmroot/wildmagic5'...
$ git fetch origin a50ec4b4e82c184c2c2c14f234102fbae4e5b225:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/wildmagic5
 * [new ref]         a50ec4b4e82c184c2c2c14f234102fbae4e5b225 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a50ec4b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild