$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Generator-PerlData.git /var/lib/mock/f45-build-27491-624/root/chroot_tmpdir/scmroot/perl-XML-Generator-PerlData
Cloning into '/var/lib/mock/f45-build-27491-624/root/chroot_tmpdir/scmroot/perl-XML-Generator-PerlData'...
$ git fetch origin 49ec768dd4ff080c3ded9d693074e28c1711d9fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Generator-PerlData
 * [new ref]         49ec768dd4ff080c3ded9d693074e28c1711d9fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49ec768 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild