Document how to use hotfix_source_repo

[dhirschfeld]

IIUC the raw output from conda index is no longer useful as conda won't be able install packages based on it - instead, the raw output must be patched with the hotfixes in a given repo.

It appears that for anaconda packages the hotfixes live at:

• https://github.com/AnacondaRecipes/repodata-hotfixes

...whereas for conda-forge the hotfixes live at:

• https://github.com/conda-forge/conda-forge-repodata-patches-feedstock

Am I correct so far?

I was then trying to grok how to apply these hotfixes when I came accross the hotfix_source_repo argument in the update_index function:

conda-build/conda_build/index.py

Lines 296 to 299 in 12319d3

	def update_index(dir_path, check_md5=False, channel_name=None, patch_generator=None, threads=MAX_THREADS_DEFAULT,
	verbose=False, progress=False, hotfix_source_repo=None, subdirs=None, warn=True,
	shared_format_cache=True, current_index_versions=None, debug=False):
	"""

It seems like this might do exactly what I'm after but I'm not too sure how to use it.

[dhirschfeld]

I'm imagining a syntax such as:

conda index --hotfix-source-repo=https://github.com/AnacondaRecipes/repodata-hotfixes

...but maybe that's not correct and it needs a local checkout?

It would be good if someone could let me know if I'm on the right track.

[dhirschfeld]

Just waiting on the cloudflare CDN issue before I can install the latest and actually test it out...

[dhirschfeld]

Confirmation from gitter:
https://gitter.im/conda-forge/conda-forge.github.io?at=5dcb1943fd6fe41fc07209e3

The hotfixing logic is part of conda index which is included in conda-build. The fixes are passed via the -p or --hotfix-source-repo arguments.

[dhirschfeld]

Closed by #3931

[github-actions]

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