Get package version for conda meta.yaml from source file

Question

I\'m trying to reorganize my python package versioning so I only have to update the version in one place, preferably a python module or a text file. For all the places I nee

Answer 1

As of conda-build-3.16.1 (Nov-2018) here is what works to programmatically setup version inside the conda recipe.

The examples are a part of meta.yaml that you pass to conda-build, as explained here.

A. Tap into setup.py's version:

This recipe is perfect if you build a python package, since setup.py needs it anyway, so you must have figured that one out already.

{% set data = load_setup_py_data() %}

package:
  name: mypackage
  version: {{ data.get('version') }}

note that sometimes you have to tell the conda recipe explicitly where to find it, if it's not in the same dir as setup.py:

{% set data = load_setup_py_data(setup_file='../setup.py', from_recipe_dir=True) %}

and now proceed with:

$ conda-build conda-recipe

---

B. Git env variables

This recipe is good if your project is tagged in git, and you use a tag format that conda accepts as a valid version number (e.g. 2.5.1 or v2.5.1).

package:
  name: hub
  version: {{ GIT_DESCRIBE_TAG }}

and now proceed with:

$ conda-build conda-recipe

---

C. Pass env variable:

This one is useful for non-python conda packages, where the version comes from a variety of different places, and you can perfect its value - e.g. convert v2.5.1 into 2.5.1.

package:
  name: mypkg
  version: {{ environ.get('MYPKG_VERSION', '') }}

Then create an executable script that fetches the version, let's call it script-to-get-mypkg-version

and now proceed with loading the env var that will set the version:

$ MYPKG_VERSION=`script-to-get-mypkg-version` conda-build conda-recipe

Depending on the conda-build version, you may have to use os.environ.get instead of environ.get. The docs use the latter.

---

This doesn't work

Note that if this used to work in the past, as described in one of the answers from 2016, it doesn't work now.

package:
  name: mypkg
build:
  script_env:
    - VERSION

$ VERSION=`script-to-get-mypkg-version` conda-build conda-recipe

conda-build ignores env var VERSION in this case.

source.