$ git clone -n https://src.fedoraproject.org/rpms/sendxmpp.git /var/lib/mock/f45-build-35804-699/root/chroot_tmpdir/scmroot/sendxmpp
Cloning into '/var/lib/mock/f45-build-35804-699/root/chroot_tmpdir/scmroot/sendxmpp'...
$ git fetch origin fe68116d1f5cb44fdf6c177738f5e59cfd9251c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sendxmpp
 * [new ref]         fe68116d1f5cb44fdf6c177738f5e59cfd9251c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe68116 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild