Map conda channels to prefix.dev mirrors for pixi builds #967
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Enable sharded repodata for pixi-based container builds by automatically mapping well-known conda channels to their prefix.dev mirrors: - conda-forge -> https://prefix.dev/conda-forge - bioconda -> https://prefix.dev/bioconda This provides 50-100x faster package resolution according to: https://prefix.dev/blog/sharded_repodata The mapping is only applied when using the CONDA_PIXI_V1 build template, leaving other build templates (micromamba v1/v2) unchanged. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Enable sharded repodata for pixi-based container builds by automatically mapping well-known conda channels to their prefix.dev mirrors:
conda-forge→https://prefix.dev/conda-forgebioconda→https://prefix.dev/biocondaRationale
According to the prefix.dev blog post on sharded repodata, using prefix.dev mirrors provides significant performance improvements for package resolution:
The sharded repodata architecture splits package metadata into content-addressed shards (one per package name), enabling aggressive caching and faster downloads compared to monolithic
repodata.jsonfiles.Implementation
mapChannelsToPixiServers()method inPixiHelperto map known channels to prefix.dev mirrorscondaFileFromRequest()inContainerHelperto apply channel mapping only whenbuildTemplate == CONDA_PIXI_V1Test plan
PixiHelperTestContainerHelperTestverifying mapping is applied only for pixi builds🤖 Generated with Claude Code