$ git clone -n https://src.fedoraproject.org/rpms/perl-CPAN-Meta.git /var/lib/mock/f45-build-21970-589/root/chroot_tmpdir/scmroot/perl-CPAN-Meta
Cloning into '/var/lib/mock/f45-build-21970-589/root/chroot_tmpdir/scmroot/perl-CPAN-Meta'...
$ git fetch origin 5d762121b855eac4d15b0a30fe13ced9d76b9fa0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CPAN-Meta
 * [new ref]         5d762121b855eac4d15b0a30fe13ced9d76b9fa0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d76212 Update to 2.150014 (rhbz#2526086)