Arvados

API install guide tells you to run various database setup commands with sudo -u postgres …. It's not obvious how to run these when you install a PostgreSQL Software Collection. If you already enabled the collection, sudo loses that information. If you scl enable postgresql92 sudo -u postgres … throws a weird library error. The most direct translation is sudo -u postgres scl enable postgresql92 "…".

To help keep instructions cross-platform, install guide should tell users to start a shell as postgres, just like arv-git-httpd guide does for the git user. People using Software Collections will start the shell with sudo -u postgres scl enable postgresql92 bash. All others will use sudo -u postgres -i bash. From there, all PostgreSQL commands will be the same.