Embed minibp into soong_ui.
This requires linking Blueprint into soong_ui. It lets us avoid the
complicated dance of Ninja files and shell scripts: now the information
as to how soong_build is built is passed directly to Blueprint using a
struct that contains all the information the command line arguments used
to contain.
The ability to run Blueprint from the command line is kept (for now).
Some variables in bootstrap/command.go needed public accessor functions
because soong_build reads them. This will be disentangled by moving the
flag parsing to soong_build.
The presence of the flag definitions in Blueprint means that soong_ui
now also accepts them. This is not a problem in practice because they
are ignored and because soong_ui itself is hidden behind a few layers of
shell scripts.
Test: Presubmits + the new bootstrap_test.sh .
Change-Id: I6dca478f356f56a8aee1e457d71439272351390b
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 884e957..a8a65b1 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -23,6 +23,8 @@
"android/soong/shared"
soong_metrics_proto "android/soong/ui/metrics/metrics_proto"
+ "github.com/google/blueprint"
+ "github.com/google/blueprint/bootstrap"
"github.com/golang/protobuf/proto"
"github.com/google/blueprint/microfactory"
@@ -42,17 +44,75 @@
// This uses Android.bp files and various tools to generate <builddir>/build.ninja.
//
-// However, the execution of <builddir>/build.ninja happens later in build/soong/ui/build/build.go#Build()
+// However, the execution of <builddir>/build.ninja happens later in
+// build/soong/ui/build/build.go#Build()
//
-// We want to rely on as few prebuilts as possible, so there is some bootstrapping here.
+// We want to rely on as few prebuilts as possible, so we need to bootstrap
+// Soong. The process is as follows:
//
-// "Microfactory" is a tool for compiling Go code. We use it to build two other tools:
-// - minibp, used to generate build.ninja files. This is really build/blueprint/bootstrap/command.go#Main()
-// - bpglob, used during incremental builds to identify files in a glob that have changed
+// 1. We use "Microfactory", a simple tool to compile Go code, to build
+// first itself, then soong_ui from soong_ui.bash. This binary contains
+// parts of soong_build that are needed to build itself.
+// 2. This simplified version of soong_build then reads the Blueprint files
+// that describe itself and emits .bootstrap/build.ninja that describes
+// how to build its full version and use that to produce the final Ninja
+// file Soong emits.
+// 3. soong_ui executes .bootstrap/build.ninja
//
-// In reality, several build.ninja files are generated and/or used during the bootstrapping and build process.
-// See build/blueprint/bootstrap/doc.go for more information.
-//
+// (After this, Kati is executed to parse the Makefiles, but that's not part of
+// bootstrapping Soong)
+
+// A tiny struct used to tell Blueprint that it's in bootstrap mode. It would
+// probably be nicer to use a flag in bootstrap.Args instead.
+type BlueprintConfig struct {
+ srcDir string
+ buildDir string
+ ninjaBuildDir string
+}
+
+func (c BlueprintConfig) GeneratingPrimaryBuilder() bool {
+ return true
+}
+
+func (c BlueprintConfig) SrcDir() string {
+ return "."
+}
+
+func (c BlueprintConfig) BuildDir() string {
+ return c.buildDir
+}
+
+func (c BlueprintConfig) NinjaBuildDir() string {
+ return c.ninjaBuildDir
+}
+
+func bootstrapBlueprint(ctx Context, config Config) {
+ ctx.BeginTrace(metrics.RunSoong, "blueprint bootstrap")
+ defer ctx.EndTrace()
+
+ var args bootstrap.Args
+
+ args.RunGoTests = !config.skipSoongTests
+ args.UseValidations = true // Use validations to depend on tests
+ args.BuildDir = config.SoongOutDir()
+ args.NinjaBuildDir = config.OutDir()
+ args.TopFile = "Android.bp"
+ args.ModuleListFile = filepath.Join(config.FileListDir(), "Android.bp.list")
+ args.OutFile = shared.JoinPath(config.SoongOutDir(), ".bootstrap/build.ninja")
+ args.DepFile = shared.JoinPath(config.SoongOutDir(), ".bootstrap/build.ninja.d")
+ args.GlobFile = shared.JoinPath(config.SoongOutDir(), ".bootstrap/soong-build-globs.ninja")
+
+ blueprintCtx := blueprint.NewContext()
+ blueprintCtx.SetIgnoreUnknownModuleTypes(true)
+ blueprintConfig := BlueprintConfig{
+ srcDir: os.Getenv("TOP"),
+ buildDir: config.SoongOutDir(),
+ ninjaBuildDir: config.OutDir(),
+ }
+
+ bootstrap.RunBlueprint(args, blueprintCtx, blueprintConfig)
+}
+
func runSoong(ctx Context, config Config) {
ctx.BeginTrace(metrics.RunSoong, "soong")
defer ctx.EndTrace()
@@ -63,33 +123,15 @@
// unused variables were changed?
envFile := filepath.Join(config.SoongOutDir(), "soong.environment.available")
- // Use an anonymous inline function for tracing purposes (this pattern is used several times below).
- func() {
- ctx.BeginTrace(metrics.RunSoong, "blueprint bootstrap")
- defer ctx.EndTrace()
-
- // Use validations to depend on tests.
- args := []string{"-n"}
-
- if !config.skipSoongTests {
- // Run tests.
- args = append(args, "-t")
+ for _, n := range []string{".bootstrap", ".minibootstrap"} {
+ dir := filepath.Join(config.SoongOutDir(), n)
+ if err := os.MkdirAll(dir, 0755); err != nil {
+ ctx.Fatalf("Cannot mkdir " + dir)
}
+ }
- cmd := Command(ctx, config, "blueprint bootstrap", "build/blueprint/bootstrap.bash", args...)
-
- cmd.Environment.Set("BLUEPRINTDIR", "./build/blueprint")
- cmd.Environment.Set("BOOTSTRAP", "./build/blueprint/bootstrap.bash")
- cmd.Environment.Set("BUILDDIR", config.SoongOutDir())
- cmd.Environment.Set("GOROOT", "./"+filepath.Join("prebuilts/go", config.HostPrebuiltTag()))
- cmd.Environment.Set("BLUEPRINT_LIST_FILE", filepath.Join(config.FileListDir(), "Android.bp.list"))
- cmd.Environment.Set("NINJA_BUILDDIR", config.OutDir())
- cmd.Environment.Set("SRCDIR", ".")
- cmd.Environment.Set("TOPNAME", "Android.bp")
- cmd.Sandbox = soongSandbox
-
- cmd.RunAndPrintOrFatal()
- }()
+ // This is done unconditionally, but does not take a measurable amount of time
+ bootstrapBlueprint(ctx, config)
soongBuildEnv := config.Environment().Copy()
soongBuildEnv.Set("TOP", os.Getenv("TOP"))
@@ -105,6 +147,11 @@
soongBuildEnv.Set("BAZEL_WORKSPACE", absPath(ctx, "."))
soongBuildEnv.Set("BAZEL_METRICS_DIR", config.BazelMetricsDir())
+ // For Soong bootstrapping tests
+ if os.Getenv("ALLOW_MISSING_DEPENDENCIES") == "true" {
+ soongBuildEnv.Set("ALLOW_MISSING_DEPENDENCIES", "true")
+ }
+
err := writeEnvironmentFile(ctx, envFile, soongBuildEnv.AsMap())
if err != nil {
ctx.Fatalf("failed to write environment file %s: %s", envFile, err)
@@ -130,16 +177,6 @@
cfg.TrimPath = absPath(ctx, ".")
func() {
- ctx.BeginTrace(metrics.RunSoong, "minibp")
- defer ctx.EndTrace()
-
- minibp := filepath.Join(config.SoongOutDir(), ".minibootstrap/minibp")
- if _, err := microfactory.Build(&cfg, minibp, "github.com/google/blueprint/bootstrap/minibp"); err != nil {
- ctx.Fatalln("Failed to build minibp:", err)
- }
- }()
-
- func() {
ctx.BeginTrace(metrics.RunSoong, "bpglob")
defer ctx.EndTrace()
@@ -187,10 +224,6 @@
cmd.Sandbox = soongSandbox
cmd.RunAndStreamOrFatal()
}
-
- // This build generates .bootstrap/build.ninja, which is used in the next step.
- ninja("minibootstrap", ".minibootstrap/build.ninja")
-
// This build generates <builddir>/build.ninja, which is used later by build/soong/ui/build/build.go#Build().
ninja("bootstrap", ".bootstrap/build.ninja")