$ git clone -n https://src.fedoraproject.org/rpms/kf5-kxmlgui.git /var/lib/mock/f39-build-1525058-36037/root/chroot_tmpdir/scmroot/kf5-kxmlgui
Cloning into '/var/lib/mock/f39-build-1525058-36037/root/chroot_tmpdir/scmroot/kf5-kxmlgui'...
$ git fetch origin 15bac15348c136a970fcdd8badf49d6b3e4c003f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kxmlgui
 * [new ref]         15bac15348c136a970fcdd8badf49d6b3e4c003f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15bac15 5.111.0