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Currently we execute bash and within that bash we execute scl enable tfm "bash wrapper". This results in a complex process tree:

/bin/bash /usr/bin/tfm-rake -- console
 \_ scl enable tfm bash /tmp/tmp.4vH4dRd7aM
     \_ /bin/bash /var/tmp/scliO1x5z
         \_ bash /tmp/tmp.4vH4dRd7aM
             \_ /opt/rh/rh-ruby25/root/usr/bin/ruby /opt/rh/rh-ruby25/root/usr/bin/rake -- console

It can also use source scl_enable tfm && exec ruby "$@" and end up with a much smaller process tree since it replaces the parent process:

/opt/rh/rh-ruby25/root/usr/bin/ruby /opt/rh/rh-ruby25/root/usr/bin/rake console

This still avoids https://bugzilla.redhat.com/show_bug.cgi?id=1248418 in a different way.