$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-gtk.git /var/lib/mock/f40-build-1931854-25123/root/chroot_tmpdir/scmroot/fcitx5-gtk
Cloning into '/var/lib/mock/f40-build-1931854-25123/root/chroot_tmpdir/scmroot/fcitx5-gtk'...
$ git fetch origin fe02c28e34ac0809b2bcd309e86fadffb3422b58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-gtk
 * [new ref]         fe02c28e34ac0809b2bcd309e86fadffb3422b58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe02c28 update to upstream release 5.1.3