$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-gtk.git /var/lib/mock/f39-build-1521052-35836/root/chroot_tmpdir/scmroot/fcitx5-gtk
Cloning into '/var/lib/mock/f39-build-1521052-35836/root/chroot_tmpdir/scmroot/fcitx5-gtk'...
$ git fetch origin 1b90c76d01c1da6a83f08f494ae21806336ddc3b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-gtk
 * [new ref]         1b90c76d01c1da6a83f08f494ae21806336ddc3b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b90c76 update to upstream release 5.1.0