$ git clone -n https://src.fedoraproject.org/rpms/sigscheme.git /var/lib/mock/f45-build-35960-700/root/chroot_tmpdir/scmroot/sigscheme
Cloning into '/var/lib/mock/f45-build-35960-700/root/chroot_tmpdir/scmroot/sigscheme'...
$ git fetch origin ca9439668978a06c0c3bbaab763ddf38cd5ff30b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sigscheme
 * [new ref]         ca9439668978a06c0c3bbaab763ddf38cd5ff30b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca94396 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild