$ git clone -n https://src.fedoraproject.org/rpms/perl-CPAN-Changes.git /var/lib/mock/f40-build-2229308-53144/root/chroot_tmpdir/scmroot/perl-CPAN-Changes
Cloning into '/var/lib/mock/f40-build-2229308-53144/root/chroot_tmpdir/scmroot/perl-CPAN-Changes'...
$ git fetch origin d07af967a2f0f733e3dd055d67f13bfe4e1bb169:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CPAN-Changes
 * [new ref]         d07af967a2f0f733e3dd055d67f13bfe4e1bb169 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d07af96 Update to 0.500002