$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Simple.git /var/lib/mock/f45-build-27545-624/root/chroot_tmpdir/scmroot/perl-XML-Simple
Cloning into '/var/lib/mock/f45-build-27545-624/root/chroot_tmpdir/scmroot/perl-XML-Simple'...
$ git fetch origin cc199011f6e7ede010dc0bff7367494fcbe2859c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Simple
 * [new ref]         cc199011f6e7ede010dc0bff7367494fcbe2859c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc19901 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild