$ git clone -n https://src.fedoraproject.org/rpms/qxmpp.git /var/lib/mock/f42-build-side-1-3499386-45964/root/chroot_tmpdir/scmroot/qxmpp
Cloning into '/var/lib/mock/f42-build-side-1-3499386-45964/root/chroot_tmpdir/scmroot/qxmpp'...
$ git fetch origin 2cc0386683cdcbdd23496e517604005aacff4478:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qxmpp
 * [new ref]         2cc0386683cdcbdd23496e517604005aacff4478 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cc0386 1.10.3