Respect package boundaries in bp2build conversion of go modules

bp2build's codegen context does not implement
BazelPathConversionContext. To reuse the utility function
transformPackagePaths, update its signature

(Also make deps of go_library unique to make the conversion resilient)

Test: go test ./bp2build
Change-Id: I126b1057d2b26bc6c7d3be2780f1b62d28323cf0

android/bazel_paths.go

@@ -198,7 +198,7 @@ func BazelLabelForModuleSrcExcludes(ctx BazelConversionPathContext, paths, exclu
 	}
 	labels := expandSrcsForBazel(ctx, paths, excluded)
 	labels.Excludes = excludeLabels.Includes
-	labels = transformSubpackagePaths(ctx, labels)
+	labels = TransformSubpackagePaths(ctx.Config(), ctx.ModuleDir(), labels)
 	return labels
 }
 
@@ -237,7 +237,7 @@ func isPackageBoundary(config Config, prefix string, components []string, compon
 // if the "async_safe" directory is actually a package and not just a directory.
 //
 // In particular, paths that extend into packages are transformed into absolute labels beginning with //.
-func transformSubpackagePath(ctx BazelConversionPathContext, path bazel.Label) bazel.Label {
+func transformSubpackagePath(cfg Config, dir string, path bazel.Label) bazel.Label {
 	var newPath bazel.Label
 
 	// Don't transform OriginalModuleName
@@ -281,7 +281,7 @@ func transformSubpackagePath(ctx BazelConversionPathContext, path bazel.Label) b
 	for i := len(pathComponents) - 1; i >= 0; i-- {
 		pathComponent := pathComponents[i]
 		var sep string
-		if !foundPackageBoundary && isPackageBoundary(ctx.Config(), ctx.ModuleDir(), pathComponents, i) {
+		if !foundPackageBoundary && isPackageBoundary(cfg, dir, pathComponents, i) {
 			sep = ":"
 			foundPackageBoundary = true
 		} else {
@@ -295,7 +295,7 @@ func transformSubpackagePath(ctx BazelConversionPathContext, path bazel.Label) b
 	}
 	if foundPackageBoundary {
 		// Ensure paths end up looking like //bionic/... instead of //./bionic/...
-		moduleDir := ctx.ModuleDir()
+		moduleDir := dir
 		if strings.HasPrefix(moduleDir, ".") {
 			moduleDir = moduleDir[1:]
 		}
@@ -313,13 +313,13 @@ func transformSubpackagePath(ctx BazelConversionPathContext, path bazel.Label) b
 
 // Transform paths to acknowledge package boundaries
 // See transformSubpackagePath() for more information
-func transformSubpackagePaths(ctx BazelConversionPathContext, paths bazel.LabelList) bazel.LabelList {
+func TransformSubpackagePaths(cfg Config, dir string, paths bazel.LabelList) bazel.LabelList {
 	var newPaths bazel.LabelList
 	for _, include := range paths.Includes {
-		newPaths.Includes = append(newPaths.Includes, transformSubpackagePath(ctx, include))
+		newPaths.Includes = append(newPaths.Includes, transformSubpackagePath(cfg, dir, include))
 	}
 	for _, exclude := range paths.Excludes {
-		newPaths.Excludes = append(newPaths.Excludes, transformSubpackagePath(ctx, exclude))
+		newPaths.Excludes = append(newPaths.Excludes, transformSubpackagePath(cfg, dir, exclude))
 	}
 	return newPaths
 }

android/bazel_paths_test.go

@@ -175,7 +175,7 @@ func TestTransformSubpackagePath(t *testing.T) {
 		"./z/b.c": "z/b.c",
 	}
 	for in, out := range pairs {
-		actual := transformSubpackagePath(ctx, bazel.Label{Label: in}).Label
+		actual := transformSubpackagePath(ctx.Config(), ctx.ModuleDir(), bazel.Label{Label: in}).Label
 		if actual != out {
 			t.Errorf("expected:\n%v\nactual:\n%v", out, actual)
 		}

bp2build/build_conversion.go

@@ -302,21 +302,25 @@ func targetNotCompatibleWithAndroid() bazel.LabelListAttribute {
 
 // helper function to return labels for srcs used in bootstrap_go_package and bootstrap_go_binary
 // this function has the following limitations which make it unsuitable for widespread use
-// 1. wildcard patterns in srcs
-// 2. package boundary violations
-// (1) is ok for go since build/blueprint does not support it. (2) _might_ be ok too.
+// - wildcard patterns in srcs
+// This is ok for go since build/blueprint does not support it.
 //
 // Prefer to use `BazelLabelForModuleSrc` instead
-func goSrcLabels(srcs []string, linuxSrcs, darwinSrcs []string) bazel.LabelListAttribute {
+func goSrcLabels(cfg android.Config, moduleDir string, srcs []string, linuxSrcs, darwinSrcs []string) bazel.LabelListAttribute {
 	labels := func(srcs []string) bazel.LabelList {
 		ret := []bazel.Label{}
 		for _, src := range srcs {
 			srcLabel := bazel.Label{
-				Label: ":" + src, // TODO - b/284483729: Fix for possible package boundary violations
+				Label: src,
 			}
 			ret = append(ret, srcLabel)
 		}
-		return bazel.MakeLabelList(ret)
+		// Respect package boundaries
+		return android.TransformSubpackagePaths(
+			cfg,
+			moduleDir,
+			bazel.MakeLabelList(ret),
+		)
 	}
 
 	ret := bazel.LabelListAttribute{}
@@ -371,8 +375,11 @@ func generateBazelTargetsGoPackage(ctx *android.Context, g *bootstrap.GoPackage,
 		Importpath: bazel.StringAttribute{
 			Value: proptools.StringPtr(g.GoPkgPath()),
 		},
-		Srcs:                   goSrcLabels(g.Srcs(), g.LinuxSrcs(), g.DarwinSrcs()),
-		Deps:                   goDepLabels(transitiveDeps, goModulesMap),
+		Srcs: goSrcLabels(ctx.Config(), ctx.ModuleDir(g), g.Srcs(), g.LinuxSrcs(), g.DarwinSrcs()),
+		Deps: goDepLabels(
+			android.FirstUniqueStrings(transitiveDeps),
+			goModulesMap,
+		),
 		Target_compatible_with: targetNotCompatibleWithAndroid(),
 	}
 
@@ -444,7 +451,7 @@ func generateBazelTargetsGoBinary(ctx *android.Context, g *bootstrap.GoBinary, g
 	transitiveDeps := transitiveGoDeps(g.Deps(), goModulesMap)
 
 	ga := goAttributes{
-		Srcs:                   goSrcLabels(g.Srcs(), g.LinuxSrcs(), g.DarwinSrcs()),
+		Srcs:                   goSrcLabels(ctx.Config(), ctx.ModuleDir(g), g.Srcs(), g.LinuxSrcs(), g.DarwinSrcs()),
 		Deps:                   goDepLabels(transitiveDeps, goModulesMap),
 		Target_compatible_with: targetNotCompatibleWithAndroid(),
 	}

bp2build/go_conversion_test.go

@@ -75,11 +75,11 @@ bootstrap_go_package {
 				"deps":       `["//bar:bar"]`,
 				"importpath": `"android/foo"`,
 				"srcs": `[
-        ":foo1.go",
-        ":foo2.go",
+        "foo1.go",
+        "foo2.go",
     ] + select({
-        "//build/bazel/platforms/os:darwin": [":foo_darwin.go"],
-        "//build/bazel/platforms/os:linux_glibc": [":foo_linux.go"],
+        "//build/bazel/platforms/os:darwin": ["foo_darwin.go"],
+        "//build/bazel/platforms/os:linux_glibc": ["foo_linux.go"],
         "//conditions:default": [],
     })`,
 			},
@@ -118,7 +118,31 @@ bootstrap_go_package {
         "//bar:bar",
         "//bar:baz",
     ]`,
-				"srcs": `[":main.go"]`,
+				"srcs": `["main.go"]`,
+			},
+			android.HostSupported,
+		)},
+	})
+}
+
+func TestConvertGoBinaryWithSrcInDifferentPackage(t *testing.T) {
+	bp := `
+blueprint_go_binary {
+	name: "foo",
+	srcs: ["subdir/main.go"],
+}
+`
+	t.Parallel()
+	runGoTests(t, Bp2buildTestCase{
+		Description: "Convert blueprint_go_binary with src in different package",
+		Blueprint:   bp,
+		Filesystem: map[string]string{
+			"subdir/Android.bp": "",
+		},
+		ExpectedBazelTargets: []string{makeBazelTargetHostOrDevice("go_binary", "foo",
+			AttrNameToString{
+				"deps": `[]`,
+				"srcs": `["//subdir:main.go"]`,
 			},
 			android.HostSupported,
 		)},