$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-lua.git /var/lib/mock/f42-build-3339964-41426/root/chroot_tmpdir/scmroot/fcitx5-lua
Cloning into '/var/lib/mock/f42-build-3339964-41426/root/chroot_tmpdir/scmroot/fcitx5-lua'...
$ git fetch origin 3acb41abdd92105961d6b963aa019813926c0e5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-lua
 * [new ref]         3acb41abdd92105961d6b963aa019813926c0e5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3acb41a update to upstream release 5.0.14