$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-Jabber.git /var/lib/mock/f41-build-744386-13343/root/chroot_tmpdir/scmroot/perl-Net-Jabber
Cloning into '/var/lib/mock/f41-build-744386-13343/root/chroot_tmpdir/scmroot/perl-Net-Jabber'...
$ git fetch origin 13dc26393495ec9493bf925b6b8e51b70eba12cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-Jabber
 * [new ref]         13dc26393495ec9493bf925b6b8e51b70eba12cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13dc263 Eliminate use of obsolete %patchN syntax (#2283636)