$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-DifferenceMarkup.git /var/lib/mock/f41-build-816749-150376/root/chroot_tmpdir/scmroot/perl-XML-DifferenceMarkup
Cloning into '/var/lib/mock/f41-build-816749-150376/root/chroot_tmpdir/scmroot/perl-XML-DifferenceMarkup'...
$ git fetch origin aca0c78a1c28f6a05223b29aadab034119fe705c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-DifferenceMarkup
 * [new ref]         aca0c78a1c28f6a05223b29aadab034119fe705c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aca0c78 Perl 5.40 rebuild