Revert "Move AllowMissingDependencies check from PathsForSource to PathForSource"

This reverts commit 94a321045a.

Reason for revert: Broke builds with ALLOW_MISSING_DEPENDENCIES=true

Change-Id: I9604887f796a79809ef8d6c741597796219dcaf3

android/paths.go

@@ -195,6 +195,20 @@ type Paths []Path
 
 // PathsForSource returns Paths rooted from SrcDir
 func PathsForSource(ctx PathContext, paths []string) Paths {
+	if ctx.Config().AllowMissingDependencies() {
+		if modCtx, ok := ctx.(ModuleContext); ok {
+			ret := make(Paths, 0, len(paths))
+			for _, path := range paths {
+				p := ExistentPathForSource(ctx, path)
+				if p.Valid() {
+					ret = append(ret, p.Path())
+				} else {
+					modCtx.AddMissingDependencies([]string{path})
+				}
+			}
+			return ret
+		}
+	}
 	ret := make(Paths, len(paths))
 	for i, path := range paths {
 		ret[i] = PathForSource(ctx, path)
@@ -493,100 +507,100 @@ func safePathForSource(ctx PathContext, path string) SourcePath {
 	return ret
 }
 
-// pathForSource creates a SourcePath from pathComponents, but does not check that it exists.
-func pathForSource(ctx PathContext, pathComponents ...string) (SourcePath, error) {
-	p, err := validatePath(pathComponents...)
-	ret := SourcePath{basePath{p, ctx.Config(), ""}}
-	if err != nil {
-		return ret, err
-	}
-
-	abs, err := filepath.Abs(ret.String())
-	if err != nil {
-		return ret, err
-	}
-	buildroot, err := filepath.Abs(ctx.Config().buildDir)
-	if err != nil {
-		return ret, err
-	}
-	if strings.HasPrefix(abs, buildroot) {
-		return ret, fmt.Errorf("source path %s is in output", abs)
-	}
-
-	if pathtools.IsGlob(ret.String()) {
-		return ret, fmt.Errorf("path may not contain a glob: %s", ret.String())
-	}
-
-	return ret, nil
-}
-
-// existsWithDependencies returns true if the path exists, and adds appropriate dependencies to rerun if the
-// path does not exist.
-func existsWithDependencies(ctx PathContext, path SourcePath) (exists bool, err error) {
-	var files []string
-
-	if gctx, ok := ctx.(PathGlobContext); ok {
-		// Use glob to produce proper dependencies, even though we only want
-		// a single file.
-		files, err = gctx.GlobWithDeps(path.String(), nil)
-	} else {
-		var deps []string
-		// We cannot add build statements in this context, so we fall back to
-		// AddNinjaFileDeps
-		files, deps, err = pathtools.Glob(path.String(), nil)
-		ctx.AddNinjaFileDeps(deps...)
-	}
-
-	if err != nil {
-		return false, fmt.Errorf("glob: %s", err.Error())
-	}
-
-	return len(files) > 0, nil
-}
-
 // PathForSource joins the provided path components and validates that the result
 // neither escapes the source dir nor is in the out dir.
 // On error, it will return a usable, but invalid SourcePath, and report a ModuleError.
 func PathForSource(ctx PathContext, pathComponents ...string) SourcePath {
-	path, err := pathForSource(ctx, pathComponents...)
+	p, err := validatePath(pathComponents...)
+	ret := SourcePath{basePath{p, ctx.Config(), ""}}
 	if err != nil {
 		reportPathError(ctx, err)
+		return ret
 	}
 
-	if modCtx, ok := ctx.(ModuleContext); ok && ctx.Config().AllowMissingDependencies() {
-		exists, err := existsWithDependencies(ctx, path)
+	abs, err := filepath.Abs(ret.String())
 	if err != nil {
 		reportPathError(ctx, err)
+		return ret
 	}
-		if !exists {
-			modCtx.AddMissingDependencies([]string{path.String()})
+	buildroot, err := filepath.Abs(ctx.Config().buildDir)
+	if err != nil {
+		reportPathError(ctx, err)
+		return ret
 	}
-	} else if exists, _, err := ctx.Fs().Exists(path.String()); err != nil {
-		reportPathErrorf(ctx, "%s: %s", path, err.Error())
+	if strings.HasPrefix(abs, buildroot) {
+		reportPathErrorf(ctx, "source path %s is in output", abs)
+		return ret
+	}
+
+	if exists, _, err := ctx.Fs().Exists(ret.String()); err != nil {
+		reportPathErrorf(ctx, "%s: %s", ret, err.Error())
 	} else if !exists {
-		reportPathErrorf(ctx, "source path %s does not exist", path)
+		reportPathErrorf(ctx, "source path %s does not exist", ret)
 	}
-	return path
+	return ret
 }
 
 // ExistentPathForSource returns an OptionalPath with the SourcePath if the
 // path exists, or an empty OptionalPath if it doesn't exist. Dependencies are added
 // so that the ninja file will be regenerated if the state of the path changes.
 func ExistentPathForSource(ctx PathContext, pathComponents ...string) OptionalPath {
-	path, err := pathForSource(ctx, pathComponents...)
+	p, err := validatePath(pathComponents...)
 	if err != nil {
 		reportPathError(ctx, err)
 		return OptionalPath{}
 	}
+	path := SourcePath{basePath{p, ctx.Config(), ""}}
+
+	abs, err := filepath.Abs(path.String())
+	if err != nil {
+		reportPathError(ctx, err)
+		return OptionalPath{}
+	}
+	buildroot, err := filepath.Abs(ctx.Config().buildDir)
+	if err != nil {
+		reportPathError(ctx, err)
+		return OptionalPath{}
+	}
+	if strings.HasPrefix(abs, buildroot) {
+		reportPathErrorf(ctx, "source path %s is in output", abs)
+		return OptionalPath{}
+	}
 
-	exists, err := existsWithDependencies(ctx, path)
-	if err != nil {
-		reportPathError(ctx, err)
+	if pathtools.IsGlob(path.String()) {
+		reportPathErrorf(ctx, "path may not contain a glob: %s", path.String())
 		return OptionalPath{}
 	}
-	if !exists {
+
+	if gctx, ok := ctx.(PathGlobContext); ok {
+		// Use glob to produce proper dependencies, even though we only want
+		// a single file.
+		files, err := gctx.GlobWithDeps(path.String(), nil)
+		if err != nil {
+			reportPathErrorf(ctx, "glob: %s", err.Error())
 			return OptionalPath{}
 		}
+
+		if len(files) == 0 {
+			return OptionalPath{}
+		}
+	} else {
+		// We cannot add build statements in this context, so we fall back to
+		// AddNinjaFileDeps
+		files, dirs, err := pathtools.Glob(path.String(), nil)
+		if err != nil {
+			reportPathErrorf(ctx, "glob: %s", err.Error())
+			return OptionalPath{}
+		}
+
+		ctx.AddNinjaFileDeps(dirs...)
+
+		if len(files) == 0 {
+			return OptionalPath{}
+		}
+
+		ctx.AddNinjaFileDeps(path.String())
+	}
 	return OptionalPathForPath(path)
 }