$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-kkc.git /var/lib/mock/f45-build-8804-396/root/chroot_tmpdir/scmroot/fcitx5-kkc
Cloning into '/var/lib/mock/f45-build-8804-396/root/chroot_tmpdir/scmroot/fcitx5-kkc'...
$ git fetch origin 550c106eb415738ff90ad9f7fe5b5b81fbe59952:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-kkc
 * [new ref]         550c106eb415738ff90ad9f7fe5b5b81fbe59952 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 550c106 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild