$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-LibXML.git /var/lib/mock/f41-build-816578-150267/root/chroot_tmpdir/scmroot/perl-XML-LibXML
Cloning into '/var/lib/mock/f41-build-816578-150267/root/chroot_tmpdir/scmroot/perl-XML-LibXML'...
$ git fetch origin 7d34ec979ae3497216cff8fe841b49b647874fc8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-LibXML
 * [new ref]         7d34ec979ae3497216cff8fe841b49b647874fc8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d34ec9 Perl 5.40 rebuild