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Notes on installer mechanics

Fundamental engine is https://github.com/conda/constructor, a tool for creating double-click installers from a collection of Conda packages.

The README above has:

The constructor command takes an installer specification directory as its argument. This directory needs to contain a file construct.yaml, which specifies the name of the installer, the conda channels to pull packages from, the conda packages included in the installer, etc.

In this repo, that file is recipes/scientific-python/construct.yaml. It specifies, among other things, that conda-forge is the only channel for fetching packages to provide installer.

channels:
  - conda-forge

Later, it specifies that conda-forge is the only channel for the provided environment:

condarc:
  channels:
    - conda-forge
  channel_priority: strict
  allow_other_channels: false
  env_prompt: "(sp-0.1.0_0) "

From the contructor README:

condarc

If set, a .condarc file is written to the base environment containing the contents of this value. The value can either be a string (likely a multi-line string) or a dictionary, which will be converted to a YAML string for writing. Note: if this option is used, then all other options related to the construction of a .condarc file (write_condarc, conda_default_channels, etc.) are ignored.

Mac (Intel, ARM) build instructions are in .github/workflows/build.yaml.

Build recipes

These are all in .github/workflows/build.yml.

Mac build recipe

Summary of steps:

  • tools/extract_version.sh: this is a shell script that extracts information from the environment, and puts this information into environment variables. Within a Github action, it also sets Github environment for subsequent steps.
  • tools/run_constructor.sh runs the constructor executable to build the package from the recipe above.