Sandbox soong_build by changing to root directory

Store the current working directory and then change to the root
directory so that all file accesses must go through helpers in
the android package that properly track dependencies.

Fixes: 146437378
Test: m checkbuild
Change-Id: I12a0f907753fefd1997ab8b4ea2ac331234093cf

1 files changed, 8 insertions, 14 deletions

diff --git a/cc/compdb.go b/cc/compdb.go
index dff14dbeb..ea124438e 100644
--- a/cc/compdb.go
+++ b/cc/compdb.go
@@ -79,9 +79,9 @@ func (c *compdbGeneratorSingleton) GenerateBuildActions(ctx android.SingletonCon
 
 	// Create the output file.
 	dir := android.PathForOutput(ctx, compdbOutputProjectsDirectory)
-	os.MkdirAll(dir.String(), 0777)
+	os.MkdirAll(filepath.Join(android.AbsSrcDirForExistingUseCases(), dir.String()), 0777)
 	compDBFile := dir.Join(ctx, compdbFilename)
-	f, err := os.Create(compDBFile.String())
+	f, err := os.Create(filepath.Join(android.AbsSrcDirForExistingUseCases(), compDBFile.String()))
 	if err != nil {
 		log.Fatalf("Could not create file %s: %s", compDBFile, err)
 	}
@@ -103,8 +103,8 @@ func (c *compdbGeneratorSingleton) GenerateBuildActions(ctx android.SingletonCon
 	}
 	f.Write(dat)
 
-	finalLinkPath := filepath.Join(ctx.Config().Getenv(envVariableCompdbLink), compdbFilename)
-	if finalLinkPath != "" {
+	if finalLinkDir := ctx.Config().Getenv(envVariableCompdbLink); finalLinkDir != "" {
+		finalLinkPath := filepath.Join(finalLinkDir, compdbFilename)
 		os.Remove(finalLinkPath)
 		if err := os.Symlink(compDBFile.String(), finalLinkPath); err != nil {
 			log.Fatalf("Unable to symlink %s to %s: %s", compDBFile, finalLinkPath, err)
@@ -174,18 +174,17 @@ func generateCompdbProject(compiledModule CompiledInterface, ctx android.Singlet
 		return
 	}
 
-	rootDir := getCompdbAndroidSrcRootDirectory(ctx)
-	pathToCC, err := ctx.Eval(pctx, rootDir+"/${config.ClangBin}/")
+	pathToCC, err := ctx.Eval(pctx, "${config.ClangBin}")
 	ccPath := "/bin/false"
 	cxxPath := "/bin/false"
 	if err == nil {
-		ccPath = pathToCC + "clang"
-		cxxPath = pathToCC + "clang++"
+		ccPath = filepath.Join(pathToCC, "clang")
+		cxxPath = filepath.Join(pathToCC, "clang++")
 	}
 	for _, src := range srcs {
 		if _, ok := builds[src.String()]; !ok {
 			builds[src.String()] = compDbEntry{
-				Directory: rootDir,
+				Directory: android.AbsSrcDirForExistingUseCases(),
 				Arguments: getArguments(src, ctx, ccModule, ccPath, cxxPath),
 				File:      src.String(),
 			}
@@ -200,8 +199,3 @@ func evalAndSplitVariable(ctx android.SingletonContext, str string) ([]string, e
 	}
 	return []string{""}, err
 }
-
-func getCompdbAndroidSrcRootDirectory(ctx android.SingletonContext) string {
-	srcPath, _ := filepath.Abs(android.PathForSource(ctx).String())
-	return srcPath
-}