Best way to parameterize the version

Just wanted to get an opinion on this. As part of a continuous build pipeline, the conan package building step will have the version given by the CI system in an environment variable. It seems I can’t do:

    version = os.environ['VARIABLE_VERSION']

in my conanfile.py; so the only thing I can come up with is to use perl or something to generate the conanfile.py from a template and then export the generated file.

Is there a better way?

John

P.S. - Nice job on 0.20. I really like the fixes to environment vars.

[memsharded]

Not directly, but you can do it. Some hints:

• Have a global function in the recipe, that generates a “requires.txt”.
• Make that function to fail gently and do nothing when it doesn’t find the necessary things you have in your folder when you “export”.
• Call that function in global namespace
• Do a exports of that requires.txt
• In your requirements() method, load the requires.txt file (will be in the local cache), and define the self.requires() with the values in it.

[tamboril]

Thank you. I verified this works and is only used during export. It is safe to have the variable missing from the environment upon install. I think the error I was having was not setting the variable on install, and the key was missing in the os.environ dict. I just changed it to a os.environ.get(key, default) instead, and the default value is safely ignored at install time. getenv() looks even more apropriate.