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[flutter_tools] Prevent deletion of shared native asset hooks outputs as stale - #191272
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When switching branches or configurations where native assets hooks are not used, the build system's stale-output cleanup was deleting the shared hook outputs located in `.dart_tool/hooks_runner/shared/`. This caused subsequent builds that *do* use the hooks to fail because they assumed the outputs were up-to-date (since metadata existed) but the files were missing. This change ensures that paths within the shared hooks directory are not deleted during stale output cleanup in both `trackSharedBuildDirectory` and `_BuildInstance._invokeInternal`. Fixes flutter#191020
…system Consolidate duplicate stale output deletion and shared hooks check into a single private helper function `_deleteStaleOutputs` called by `FlutterBuildSystem.trackSharedBuildDirectory` and `_BuildInstance._invokeInternal`.
…tion Add dartdoc explaining the stale output cleanup rationale and why .dart_tool/hooks_runner/shared/ outputs are preserved.
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This pull request refactors the stale output deletion logic in the Flutter build system into a shared helper function _deleteStaleOutputs and ensures that files located in the shared hooks runner output directory are spared from deletion. Feedback was provided to canonicalize paths before using isWithin to avoid platform-specific path comparison issues, and to handle potential exceptions from resolveSymbolicLinksSync.
…_deleteStaleOutputs Canonicalize sharedHooksPath and previousFile.path before path comparison to ensure consistency across platforms (e.g. Windows drive letter casing), and guard resolveSymbolicLinksSync with a try-catch falling back to projectDir.absolute.path.
dcharkes
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Right, hooks_runner does not check if output files are not deleted and flutter_tool does check if output files are deleted.
SGTM to make flutter_tool no longer delete the output files hooks.
trackSharedBuildDirectory is invoked during standard FlutterBuildSystem.build runs and is not a test-only method.
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When switching branches or build configurations where native assets hooks are not used, the build system's stale-output cleanup was deleting shared hook outputs located in
.dart_tool/hooks_runner/shared/. This caused subsequent builds that do use native assets hooks to fail because the hook runner skipped execution (since metadata was up-to-date) while the actual binary files on disk had been deleted.This change introduces a helper function
_deleteStaleOutputsto preserve files in.dart_tool/hooks_runner/shared/during stale output cleanup in bothFlutterBuildSystem.trackSharedBuildDirectoryand_BuildInstance._invokeInternal.Fixes #191020
Pre-launch Checklist
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