# Versioned external package regression

This diagnostic fixture complements the automated `MultiplatformCacheAcceptanceTests`
workspace tests. It uses a real Git revision so it exercises SwiftPM's
`remoteSourceControl` classification and Tuist's revision-based external hashing.
A local package alone does not exercise that branch.

Run on Apple silicon with Xcode, its iOS SDKs, Git, Python 3.9+, and a Tuist binary
that includes module caching:

```sh
python3 reproduce.py --tuist /absolute/path/to/tuist --expect-reuse
```

The script copies this fixture into an isolated temporary directory, serves a
synthetic package through a Git daemon bound to `127.0.0.1`, and stops the daemon
on exit. It uses local caching (`--no-upload`), needs no hosted account, and retains
logs, artifacts, and `summary.json` in the printed evidence directory. Omitting
`--expect-reuse` checks the historical exact-hash behavior for comparison with an
older CLI.

The checks cover:

- A combined warm of `Shared` → `Leaf` for iOS device, simulator, and macOS.
- Positional focus on the unchanged incoming graph, which preserves its platform
  requirements, versus removing consumers before manifest loading, which changes
  the narrowed external graph.
- Reuse of the combined warm by each narrower graph, matching effective compiler
  settings per SDK, and actual device/simulator/macOS builds using those binaries.
- A negative case: an iOS-only warm cannot satisfy a required macOS SDK action.
- Distinct historical exact hashes with fixed Git revision and other inputs,
  including propagation of the leaf's platform-dependent hash to its parent.

The modern cache solves this with per-SDK REAPI actions and shared CAS file blobs.
Readers construct only the requested XCFramework slices locally. Products or
layouts without SDK-specific reuse use complete-output REAPI actions; historical
archives are cold misses. Explicit legacy mode retains its original behavior.

The automated workspace test additionally rewrites `Workspace.swift` from iOS +
macOS consumers to iOS-only and verifies substitution and builds. Keep this manual
fixture for the separate Git-revision hashing check, rather than duplicating the
full cache design or a dated validation report here.


[Check out example](https://github.com/tuist/tuist/tree/main/examples/xcode/generated_external_package_platform_narrowing)

Versioned external package regression

This diagnostic fixture complements the automated MultiplatformCacheAcceptanceTests workspace tests. It uses a real Git revision so it exercises SwiftPM's remoteSourceControl classification and Tuist's revision-based external hashing. A local package alone does not exercise that branch.

Run on Apple silicon with Xcode, its iOS SDKs, Git, Python 3.9+, and a Tuist binary that includes module caching:

bash

python3 reproduce.py --tuist /absolute/path/to/tuist --expect-reuse

The script copies this fixture into an isolated temporary directory, serves a synthetic package through a Git daemon bound to 127.0.0.1, and stops the daemon on exit. It uses local caching (--no-upload), needs no hosted account, and retains logs, artifacts, and summary.json in the printed evidence directory. Omitting --expect-reuse checks the historical exact-hash behavior for comparison with an older CLI.

The checks cover:

A combined warm of Shared → Leaf for iOS device, simulator, and macOS.
Positional focus on the unchanged incoming graph, which preserves its platform requirements, versus removing consumers before manifest loading, which changes the narrowed external graph.
Reuse of the combined warm by each narrower graph, matching effective compiler settings per SDK, and actual device/simulator/macOS builds using those binaries.
A negative case: an iOS-only warm cannot satisfy a required macOS SDK action.
Distinct historical exact hashes with fixed Git revision and other inputs, including propagation of the leaf's platform-dependent hash to its parent.

The modern cache solves this with per-SDK REAPI actions and shared CAS file blobs. Readers construct only the requested XCFramework slices locally. Products or layouts without SDK-specific reuse use complete-output REAPI actions; historical archives are cold misses. Explicit legacy mode retains its original behavior.

The automated workspace test additionally rewrites Workspace.swift from iOS + macOS consumers to iOS-only and verifies substitution and builds. Keep this manual fixture for the separate Git-revision hashing check, rather than duplicating the full cache design or a dated validation report here.

Check out example