$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Parser.git /var/lib/mock/f45-build-27500-624/root/chroot_tmpdir/scmroot/perl-XML-Parser
Cloning into '/var/lib/mock/f45-build-27500-624/root/chroot_tmpdir/scmroot/perl-XML-Parser'...
$ git fetch origin 86dfcb49f6b3ff023f05fd5548dfb14ace2056f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Parser
 * [new ref]         86dfcb49f6b3ff023f05fd5548dfb14ace2056f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86dfcb4 Perl 5.44 rebuild