$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-lua.git /var/lib/mock/f45-build-39838-762/root/chroot_tmpdir/scmroot/fcitx5-lua
Cloning into '/var/lib/mock/f45-build-39838-762/root/chroot_tmpdir/scmroot/fcitx5-lua'...
$ git fetch origin 2498941d8ebf65dfe909decf8b8dcef06e7e34a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-lua
 * [new ref]         2498941d8ebf65dfe909decf8b8dcef06e7e34a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2498941 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild