$ git clone -n https://src.fedoraproject.org/rpms/perl-Wx.git /var/lib/mock/f40-build-779364-130302/root/chroot_tmpdir/scmroot/perl-Wx
Cloning into '/var/lib/mock/f40-build-779364-130302/root/chroot_tmpdir/scmroot/perl-Wx'...
$ git fetch origin fc55afcc4ecfecfe8bf3fdfb8c1b5a5a0e3a4177:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Wx
 * [new ref]         fc55afcc4ecfecfe8bf3fdfb8c1b5a5a0e3a4177 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fc55afc suck it mock