$ git clone -n https://src.fedoraproject.org/rpms/perl-CPAN-Mini.git /var/lib/mock/f40-build-2229311-53144/root/chroot_tmpdir/scmroot/perl-CPAN-Mini
Cloning into '/var/lib/mock/f40-build-2229311-53144/root/chroot_tmpdir/scmroot/perl-CPAN-Mini'...
$ git fetch origin ef7ab367162c0a9f2f150d1fb0eec01868c7fcbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CPAN-Mini
 * [new ref]         ef7ab367162c0a9f2f150d1fb0eec01868c7fcbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef7ab36 Package tests