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As for the devel env, but with a file like "/cds/sw/ds/ana/conda2/manage/prod_create.yml" and when we do "conda create" it will pick up the versions that were specified in the feedstock package conda_build_config.yml.

If the pinnings have changed: To make a conda_build_config.yaml, make a devel env, export the pinnings to a yml file, then run a short python script from Valerio to make the new conda_build_config.yml, then regenerate all feedstock packages:

with open("ana-4.0.42.yml", "r") as fh:
    lines = fh.readlines()
for l in lines:
    items = l.split("=")
    name=items[0].split('- ')[1].replace("-","_")
    print(f"{name}:\n  - {items[1]}={items[2]}")

To run this script, this file must only be a list of packages: early lines the file (list of channels, etc.) must be removed by hand.  In the generated conda_build_config.yml there are a few compiler-related lines like cxx_compiler* that have to be removed, as well as backports.* lines (two or three).

If pinnings have not changed, only need the packages that have changed (e.g. psana, psdaq).

Disappearing Packages

Sometimes our precise pinned package versions disappear from conda-forge.  In the past when this happened Valerio was able to manually modify the above pinned yaml files to choose a nearby version.  This so far has not broken the fast conda-solver behavior.