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Installation notes for SL7

Overview

The dependencies for cogs are few. cogs as a library needs:

  • ERS
  • nlohmann::json

To build the cogs demo, additionally:

  • moo

deps.png

Environment

Base OS

This guide is for SL7 (or similar) base OS. If your native OS is not SL7 one method to test this guide is with a minimal Docker or Singularity container and use Fermilab UPS products from CVMFS to fill in the gaps by running something like:

$ singularity exec --bind /cvmfs /path/to/sl7.simg env -i bash --rcfile login.rc

The login.rc just sets PS1 to something reasonable.

Prepare

Some environment setup is needed. How much depends on how much of cogs to test. A full setup script with guiding comments:

Use like:

$ mkdir /path/to/work
$ cd /path/to/work
$ source /path/to/wherever/build-sl7-setup.sh

moo

Moo is a Python package (which means Python3 as Python2 has ceased). The package should build from source in any of the “usual” Python manners. In future it may be provided from PyPI. Here is one example:

$ python -m venv $TOP/venv
$ source $TOP/venv/bin/activate
$ git clone https://github.com/brettviren/moo.git
$ pip install -e .

Note: if using the setup script above, next time you use it this area will be activated.

The moo command should now be available:

$ moo
Usage: moo [OPTIONS] COMMAND [ARGS]...

  moo command line interface

Options:
  --help  Show this message and exit.

Commands:
  compile      Compile a model to JSON
  imports      Emit a list of imports required by the model
  many         Render many files
  render       Render a template against a model.
  render-many  Render many files for a project.
  validate     Validate a model against a schema

Nlohmann’s JSON

Ultimately, this is just a single header.

$ mkdir -p $TOP/include/nlohmann
$ wget -O $TOP/include/nlohmann/json.hpp https://github.com/nlohmann/json/releases/download/v3.8.0/json.hpp

cogs library

The cogs package is built with plain Waf.

$ wget -O $TOP/bin/waf https://waf.io/waf-2.0.20
$ chmod +x $TOP/bin/waf
$ waf --version
waf 2.0.20 (668769470956da8c5b60817cb8884cd7d0f87cd4)

Now cogs:

$ cd $TOP
$ git clone https://github.com/brettviren/cogs.git
$ cd cogs
$ waf --help
## no demo
$ waf configure --prefix=$TOP \
   --with-ers=$ERS_FQ_DIR \
   --with-boost=$BOOST_FQ_DIR \
   --with-nljs=$TOP \
## with demo
$ waf configure --prefix=$TOP \
   --with-ers=$ERS_FQ_DIR \
   --with-boost=$BOOST_FQ_DIR \
   --with-nljs=$TOP 
# waf install

The demo main program can be check via:

$ cogs-demo
2020-Jun-27 19:54:47,027 INFO [main(...) at unknown/demo/cogs-demo.cpp:12] usage: cogs-demo <uri>