$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-qt.git /var/lib/mock/f39-build-1565236-37557/root/chroot_tmpdir/scmroot/fcitx5-qt
Cloning into '/var/lib/mock/f39-build-1565236-37557/root/chroot_tmpdir/scmroot/fcitx5-qt'...
$ git fetch origin cfb7c632d15483261bb403935a740e48c52ec01a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-qt
 * [new ref]         cfb7c632d15483261bb403935a740e48c52ec01a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfb7c63 update to upstream release 5.1.3