[vcpkg] Expose alpha end-to-end versioning #14852
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* Check for the 'versions' feature flag while installing a manifest * Implement two-level fallback for Baselines: * First, fall back to current repo's baseline.json * Second, fall back to the ports in ports/ * Optimize checking out baseline.json via `git show` * Detect presence of '$x-default-baseline' in the manifest and use that as the baseline commit (to be replaced by Federation functionality) * If port_versions/x-/xyz.json is not found, fall back to ports in ports/
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* Check for the 'versions' feature flag while installing a manifest * Implement two-level fallback for Baselines: * First, fall back to current repo's baseline.json * Second, fall back to the ports in ports/ * Optimize checking out baseline.json via `git show` * Detect presence of '$x-default-baseline' in the manifest and use that as the baseline commit (to be replaced by Federation functionality) * If port_versions/x-/xyz.json is not found, fall back to ports in ports/ Co-authored-by: Robert Schumacher <roschuma@microsoft.com>
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port_versions/baseline.jsonports/git show"$x-default-baseline"in the manifest and use that as the baseline commit (temporary hack to be replaced by Federation functionality)port_versions/x-/xyz.jsonis not found while requesting versioned port files, fall back to current ports inports/. Note that this fallback only triggers if the version database is missing -- it does not always consider the current port files.This set of changes enables transitional functionality that smoothly switches between current behavior (if all version-related files are missing) to fully versioned (baseline + version info for ports). It also enables partial experiments to be run with a subset of version information; any missing version databases can be worked around by overriding back to the current port version.