Support sdk_version: "prerelease" sentinel in cog.yaml#2862
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michaeldwan merged 1 commit intomainfrom Mar 24, 2026
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Adds a special "prerelease" value for build.sdk_version that generates `uv pip install --pre cog` without a version pin. This lets testers always get the latest pre-release SDK without updating cog.yaml each time a new RC is cut. When stable ships, builds automatically move to stable. A build-time warning nudges users to pin a specific version for production.
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Testers using RC builds have to hardcode
sdk_version: "0.17.0rc2"in cog.yaml and bump it every time a new RC drops. That's friction for prerelease testing -- you end up pinging everyone to update their config.This adds
sdk_version: "prerelease"as a special value that generatesuv pip install --pre cogwith no version pin. Testers set it once, and eachcog buildpicks up whatever the latest pre-release is. Once stable ships, builds transparently move to stable (pip prefers stable over RC of the same version). A build-time warning nudges folks to pin a specific version before going to production.Related: #2832 (RC example project that currently hardcodes
0.17.0rc2)