$ git clone -n https://src.fedoraproject.org/rpms/ruby.git /var/lib/mock/f42-build-3487046-45834/root/chroot_tmpdir/scmroot/ruby
Cloning into '/var/lib/mock/f42-build-3487046-45834/root/chroot_tmpdir/scmroot/ruby'...
$ git fetch origin e7395a7d22eb55694f192403fbbfe7b7da2c177f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ruby
 * [new ref]         e7395a7d22eb55694f192403fbbfe7b7da2c177f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e7395a7 Fix the tests using SHA-1 Probabilistic Signature Scheme (PSS) parameters.