$ git clone -n https://src.fedoraproject.org/rpms/linkchecker.git /var/lib/mock/f45-build-17394-498/root/chroot_tmpdir/scmroot/linkchecker
Cloning into '/var/lib/mock/f45-build-17394-498/root/chroot_tmpdir/scmroot/linkchecker'...
$ git fetch origin 1d4a55e9557be78df27424a0c9262a5bc53aa866:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/linkchecker
 * [new ref]         1d4a55e9557be78df27424a0c9262a5bc53aa866 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d4a55e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild