$ git clone -n https://src.fedoraproject.org/rpms/mako.git /var/lib/mock/f45-build-17962-506/root/chroot_tmpdir/scmroot/mako
Cloning into '/var/lib/mock/f45-build-17962-506/root/chroot_tmpdir/scmroot/mako'...
$ git fetch origin 51cc0cf324580ea4aafaa5aaaf0757e34e46ec15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mako
 * [new ref]         51cc0cf324580ea4aafaa5aaaf0757e34e46ec15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51cc0cf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild