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Add conda/pixi:v1-fast template with layered conda builds - #1153
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Pixi counterpart of conda/micromamba:v2-fast: installs the environment as conda/pixi:v1, then the condasplit tool and frontend split it into up to 32 per-package layers. No change to the condasplit tool or image. - New BuildTemplate.CONDA_PIXI_V1_FAST, template, PixiHelper/ContainerHelper routing - Singularity format rejected with HTTP 400, lock files rejected as with conda/pixi:v1 - CI workflow building each -fast template next to its base template and comparing the environment file listings - Docs and ADR Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Mirror the micromamba v2-fast unit tests for the pixi v1-fast template: controller response and Singularity rejection, container file from request with default and custom options, custom base image and pixi options with a custom condasplit image. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
jordeu
approved these changes
Oct 5, 2026
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Pixi counterpart of
conda/micromamba:v2-fast(#1146, #1151).conda/pixi:v1-fastinstalls the environment exactly likeconda/pixi:v1. In the sameRUN, the existingcondasplittool moves it into up to 32 per-package layer directories, and the same BuildKit frontend adds oneCOPY --linklayer per directory.condasplittool, frontend or image. It uses thewave.build.condasplit-imagedefault (condasplit:v1)--exclude. The pixi package cache (~/.cache/rattler) is outside the environmentconda/pixi:v1and the default template are unchanged, so existing container ids don't changeformat: "sif"→ HTTP 400. Lock file URLs are rejected as withconda/pixi:v1Changes
BuildTemplate.CONDA_PIXI_V1_FAST, theconda-pixi-v1-fasttemplate, and routing inTemplateUtils,PixiHelperandContainerHelpertest-conda-layers.ymlworkflow. It builds each-fasttemplate (micromamba and pixi) next to its base template on a runner, using BuildKit v0.25.2 andgatk4+samtools. It fails if the environment file listings differ (type, size, mode, owner, symlink target, path), and prints the layer plan and image layerscondasplit/README.mdand a new ADR (adr/20261003-pixi-layered-builds.md)The comments in
condasplit/Dockerfileandfrontend/main.gostill only mention v2-fast. Editing them would change the tool's source checksum and require a new tool version.Test plan
test-conda-layers / build-test (pixi)passes: same environment asconda/pixi:v1, multiple layerstest-conda-layers / build-test (micromamba)passes🤖 Generated with Claude Code