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fix(ci): make pub get layer deterministic to enable test caching

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Remove non-deterministic "generated" and "generatorVersion" fields from
.dart_tool/package_config.json after flutter pub get, so the snapshot
hash is stable across runs and all downstream test steps can be cached.
Mount only .dart_tool/build as a mutable cache volume so the incremental
build graph persists without polluting the deterministic snapshot.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Thomas SharedInbox
2026-05-19 17:39:20 +02:00
co-authored by Claude Sonnet 4.6
parent dd9bd24f09
commit 4daf47f7a3
1 changed files with 11 additions and 9 deletions
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ci/main.go
+11 -9
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@@ -191,9 +191,9 @@ func (m *Ci) Base() *dagger.Container {
}
// pubGetLayer runs flutter pub get with only pubspec.yaml + pubspec.lock as
// inputs, then normalises the "generated" timestamp in package_config.json so
// the snapshot is byte-for-byte stable across runs. The layer is only
// re-executed when pubspec.yaml or pubspec.lock changes.
// inputs, then removes non-deterministic fields from package_config.json so
// the snapshot is byte-for-byte stable across runs. Re-executes only when
// pubspec.yaml or pubspec.lock changes.
func (m *Ci) pubGetLayer() *dagger.Container {
pubspecOnly := m.Source.Filter(dagger.DirectoryFilterOpts{
Include: []string{"pubspec.yaml", "pubspec.lock"},
@@ -202,17 +202,19 @@ func (m *Ci) pubGetLayer() *dagger.Container {
WithDirectory("/src", pubspecOnly).
WithWorkdir("/src").
WithExec([]string{"flutter", "pub", "get"}).
WithExec([]string{"/bin/sh", "-c",
`sed -i 's/"generated": *"[^"]*"/"generated": "1970-01-01T00:00:00.000000Z"/' .dart_tool/package_config.json`})
WithExec([]string{"python3", "-c",
"import json; f='.dart_tool/package_config.json'; d=json.load(open(f)); [d.pop(k,None) for k in ('generated','generatorVersion')]; json.dump(d,open(f,'w'))"})
}
// setup overlays source files onto the cached pub-get layer and runs build_runner.
// Each caller passes only the files it actually needs so Dagger's content-addressed
// cache is scoped correctly: changing website/ won't bust the Android build cache.
// setup overlays source files onto the cached pub-get layer and runs
// build_runner with its incremental build graph in a dedicated cache volume.
// Each caller passes only the files it actually needs so unrelated changes
// don't bust the build cache.
func (m *Ci) setup(src *dagger.Directory) *dagger.Container {
return m.pubGetLayer().
WithDirectory("/src", src).
WithExec([]string{"flutter", "pub", "run", "build_runner", "build"})
WithMountedCache("/src/.dart_tool/build", dag.CacheVolume("flutter-dart-tool-build")).
WithExec([]string{"flutter", "pub", "run", "build_runner", "build", "--delete-conflicting-outputs"})
}
// Setup is the exported variant (CLI / Taskfile). Uses the full check source.