$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-chewing.git /var/lib/mock/f45-build-39831-762/root/chroot_tmpdir/scmroot/fcitx5-chewing
Cloning into '/var/lib/mock/f45-build-39831-762/root/chroot_tmpdir/scmroot/fcitx5-chewing'...
$ git fetch origin e7442b6e3884a6d1d26f11ead8b51a953c7e470e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-chewing
 * [new ref]         e7442b6e3884a6d1d26f11ead8b51a953c7e470e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7442b6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild