Delay dependency errors to ninja time for unbundled builds

Unbundled builds may use a subset of the tree, which can bring in unused
modules but not their dependencies.  Delay handling of dependency errors
for unbundled builds to ninja time, which will prevent errors if only
modules with satisified dependencies are built.

Change-Id: Ib93bae93fcfa0b55df500a30d8e35231ffb0987c

3 files changed, 47 insertions, 0 deletions

diff --git a/common/config.go b/common/config.go
index 971c4c11..74e06603 100644
--- a/common/config.go
+++ b/common/config.go
@@ -22,8 +22,12 @@ import (
 	"runtime"
 	"strings"
 	"sync"
+
+	"github.com/google/blueprint/proptools"
 )
 
+var Bool = proptools.Bool
+
 // The configuration file name
 const configFileName = "soong.config"
 const productVariablesFileName = "soong.variables"
@@ -287,3 +291,7 @@ func (c *config) DefaultAppCertificateDir(ctx PathContext) SourcePath {
 func (c *config) DefaultAppCertificate(ctx PathContext) SourcePath {
 	return c.DefaultAppCertificateDir(ctx).Join(ctx, "testkey")
 }
+
+func (c *config) AllowMissingDependencies() bool {
+	return Bool(c.ProductVariables.Unbundled_build)
+}
diff --git a/common/defs.go b/common/defs.go
index 9e185e44..12500689 100644
--- a/common/defs.go
+++ b/common/defs.go
@@ -59,6 +59,13 @@ var (
 			Description: "symlink $out",
 		},
 		"fromPath")
+
+	ErrorRule = pctx.StaticRule("Error",
+		blueprint.RuleParams{
+			Command:     `echo "$error" && false`,
+			Description: "error building $out",
+		},
+		"error")
 )
 
 func init() {
diff --git a/common/module.go b/common/module.go
index e03b006e..a3de5f6b 100644
--- a/common/module.go
+++ b/common/module.go
@@ -15,7 +15,9 @@
 package common
 
 import (
+	"fmt"
 	"path/filepath"
+	"strings"
 
 	"android/soong"
 	"android/soong/glob"
@@ -363,6 +365,7 @@ func (a *AndroidModuleBase) GenerateBuildActions(ctx blueprint.ModuleContext) {
 		androidBaseContextImpl: a.androidBaseContextFactory(ctx),
 		installDeps:            a.computeInstallDeps(ctx),
 		installFiles:           a.installFiles,
+		missingDeps:            ctx.GetMissingDependencies(),
 	}
 
 	if !a.Enabled() {
@@ -397,9 +400,28 @@ type androidModuleContext struct {
 	installDeps     Paths
 	installFiles    Paths
 	checkbuildFiles Paths
+	missingDeps     []string
+}
+
+func (a *androidModuleContext) ninjaError(outputs []string, err error) {
+	a.ModuleContext.Build(pctx, blueprint.BuildParams{
+		Rule:     ErrorRule,
+		Outputs:  outputs,
+		Optional: true,
+		Args: map[string]string{
+			"error": err.Error(),
+		},
+	})
+	return
 }
 
 func (a *androidModuleContext) Build(pctx blueprint.PackageContext, params blueprint.BuildParams) {
+	if a.missingDeps != nil {
+		a.ninjaError(params.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
+			a.ModuleName(), strings.Join(a.missingDeps, ", ")))
+		return
+	}
+
 	params.Optional = true
 	a.ModuleContext.Build(pctx, params)
 }
@@ -425,9 +447,19 @@ func (a *androidModuleContext) ModuleBuild(pctx blueprint.PackageContext, params
 		bparams.Implicits = append(bparams.Implicits, params.Implicit.String())
 	}
 
+	if a.missingDeps != nil {
+		a.ninjaError(bparams.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
+			a.ModuleName(), strings.Join(a.missingDeps, ", ")))
+		return
+	}
+
 	a.ModuleContext.Build(pctx, bparams)
 }
 
+func (a *androidModuleContext) GetMissingDependencies() []string {
+	return a.missingDeps
+}
+
 func (a *androidBaseContextImpl) Arch() Arch {
 	return a.arch
 }