$ git clone -n https://src.fedoraproject.org/rpms/fcitx5-qt.git /var/lib/mock/f42-build-side-1-3505980-45995/root/chroot_tmpdir/scmroot/fcitx5-qt
Cloning into '/var/lib/mock/f42-build-side-1-3505980-45995/root/chroot_tmpdir/scmroot/fcitx5-qt'...
$ git fetch origin a45762a640eb2a8e672ba3004f5140fe5dddc2e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fcitx5-qt
 * [new ref]         a45762a640eb2a8e672ba3004f5140fe5dddc2e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a45762a Rebuild (qt6)