$ git clone -n https://src.fedoraproject.org/rpms/ruby.git /var/lib/mock/f42-build-865102-172791/root/chroot_tmpdir/scmroot/ruby
Cloning into '/var/lib/mock/f42-build-865102-172791/root/chroot_tmpdir/scmroot/ruby'...
$ git fetch origin 5f10b7c93e59aa3bf043b521289cb1c857959b6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby
 * [new ref]         5f10b7c93e59aa3bf043b521289cb1c857959b6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f10b7c Temporary disable FIPS OpenSSL test cases.