$ git clone -n https://src.fedoraproject.org/rpms/xmms2.git /var/lib/mock/f43-perl-60961534-6586810/root/chroot_tmpdir/scmroot/xmms2
Cloning into '/var/lib/mock/f43-perl-60961534-6586810/root/chroot_tmpdir/scmroot/xmms2'...
$ git fetch origin 51dffd48ce2ba3e9bb61f5fd4d1b9fdbd0ab3740:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmms2
 * [new ref]         51dffd48ce2ba3e9bb61f5fd4d1b9fdbd0ab3740 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51dffd4 Perl 5.42 rebuild