$ git clone -n https://src.fedoraproject.org/rpms/gtengine.git /var/lib/mock/f45-build-13135-446/root/chroot_tmpdir/scmroot/gtengine
Cloning into '/var/lib/mock/f45-build-13135-446/root/chroot_tmpdir/scmroot/gtengine'...
$ git fetch origin 3f80feec6865c607b9223d5dc0c22a07bdb121aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtengine
 * [new ref]         3f80feec6865c607b9223d5dc0c22a07bdb121aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f80fee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild