diff --git a/bootstrap/bootstrap.go b/bootstrap/bootstrap.go
index c64e42c..1a42551 100644
--- a/bootstrap/bootstrap.go
+++ b/bootstrap/bootstrap.go
@@ -163,7 +163,7 @@ var (
 		"depfile")
 
 	_ = pctx.VariableFunc("BinDir", func(config interface{}) (string, error) {
-		return bootstrapBinDir(), nil
+		return bootstrapBinDir(config), nil
 	})
 
 	_ = pctx.VariableFunc("ToolDir", func(config interface{}) (string, error) {
@@ -186,15 +186,15 @@ type GoBinaryTool interface {
 	isGoBinary()
 }
 
-func bootstrapBinDir() string {
-	return filepath.Join(BuildDir, bootstrapSubDir, "bin")
+func bootstrapBinDir(config interface{}) string {
+	return filepath.Join(config.(BootstrapConfig).BuildDir(), bootstrapSubDir, "bin")
 }
 
 func toolDir(config interface{}) string {
 	if c, ok := config.(ConfigBlueprintToolLocation); ok {
 		return filepath.Join(c.BlueprintToolLocation())
 	}
-	return filepath.Join(BuildDir, "bin")
+	return filepath.Join(config.(BootstrapConfig).BuildDir(), "bin")
 }
 
 func pluginDeps(ctx blueprint.BottomUpMutatorContext) {
diff --git a/bootstrap/cleanup.go b/bootstrap/cleanup.go
index 6444081..9dbea2a 100644
--- a/bootstrap/cleanup.go
+++ b/bootstrap/cleanup.go
@@ -31,8 +31,8 @@ const logFileName = ".ninja_log"
 // removeAbandonedFilesUnder removes any files that appear in the Ninja log, and
 // are prefixed with one of the `under` entries, but that are not currently
 // build targets, or in `exempt`
-func removeAbandonedFilesUnder(ctx *blueprint.Context, config *Config,
-	srcDir string, under, exempt []string) error {
+func removeAbandonedFilesUnder(ctx *blueprint.Context,
+	srcDir, buildDir string, under, exempt []string) error {
 
 	if len(under) == 0 {
 		return nil
@@ -50,7 +50,7 @@ func removeAbandonedFilesUnder(ctx *blueprint.Context, config *Config,
 
 	replacer := strings.NewReplacer(
 		"@@SrcDir@@", srcDir,
-		"@@BuildDir@@", BuildDir)
+		"@@BuildDir@@", buildDir)
 	ninjaBuildDir = replacer.Replace(ninjaBuildDir)
 	targets := make(map[string]bool)
 	for target := range targetRules {
diff --git a/bootstrap/command.go b/bootstrap/command.go
index 01e449f..85446fc 100644
--- a/bootstrap/command.go
+++ b/bootstrap/command.go
@@ -43,11 +43,12 @@ var (
 	useValidations bool
 	noGC           bool
 	emptyNinjaFile bool
+	absSrcDir      string
+
 	BuildDir       string
 	ModuleListFile string
 	NinjaBuildDir  string
 	SrcDir         string
-	absSrcDir      string
 )
 
 func init() {
@@ -121,7 +122,7 @@ func Main(ctx *blueprint.Context, config interface{}, extraNinjaFileDeps ...stri
 	}
 
 	stage := StageMain
-	if c, ok := config.(ConfigInterface); ok {
+	if c, ok := config.(interface{ GeneratingPrimaryBuilder() bool }); ok {
 		if c.GeneratingPrimaryBuilder() {
 			stage = StagePrimary
 		}
@@ -160,7 +161,7 @@ func Main(ctx *blueprint.Context, config interface{}, extraNinjaFileDeps ...stri
 	deps = append(deps, extraDeps...)
 
 	if docFile != "" {
-		err := writeDocs(ctx, absolutePath(docFile))
+		err := writeDocs(ctx, config, absolutePath(docFile))
 		if err != nil {
 			fatalErrors([]error{err})
 		}
@@ -208,7 +209,7 @@ func Main(ctx *blueprint.Context, config interface{}, extraNinjaFileDeps ...stri
 	}
 
 	if globFile != "" {
-		buffer, errs := generateGlobNinjaFile(ctx.Globs)
+		buffer, errs := generateGlobNinjaFile(config, ctx.Globs)
 		if len(errs) > 0 {
 			fatalErrors(errs)
 		}
@@ -247,7 +248,7 @@ func Main(ctx *blueprint.Context, config interface{}, extraNinjaFileDeps ...stri
 
 	if c, ok := config.(ConfigRemoveAbandonedFilesUnder); ok {
 		under, except := c.RemoveAbandonedFilesUnder()
-		err := removeAbandonedFilesUnder(ctx, bootstrapConfig, SrcDir, under, except)
+		err := removeAbandonedFilesUnder(ctx, SrcDir, BuildDir, under, except)
 		if err != nil {
 			fatalf("error removing abandoned files: %s", err)
 		}
diff --git a/bootstrap/config.go b/bootstrap/config.go
index d83b042..5873da8 100644
--- a/bootstrap/config.go
+++ b/bootstrap/config.go
@@ -61,11 +61,16 @@ var (
 	})
 )
 
-type ConfigInterface interface {
-	// GeneratingPrimaryBuilder should return true if this build invocation is
-	// creating a .bootstrap/build.ninja file to be used to build the
-	// primary builder
-	GeneratingPrimaryBuilder() bool
+type BootstrapConfig interface {
+	// The top-level directory of the source tree
+	SrcDir() string
+
+	// The directory where files emitted during bootstrapping are located.
+	// Usually NinjaBuildDir() + "/soong".
+	BuildDir() string
+
+	// The output directory for the build.
+	NinjaBuildDir() string
 }
 
 type ConfigRemoveAbandonedFilesUnder interface {
diff --git a/bootstrap/glob.go b/bootstrap/glob.go
index cf5af72..db7f37f 100644
--- a/bootstrap/glob.go
+++ b/bootstrap/glob.go
@@ -146,7 +146,7 @@ func (s *globSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
 	}
 }
 
-func generateGlobNinjaFile(globLister func() []blueprint.GlobPath) ([]byte, []error) {
+func generateGlobNinjaFile(config interface{}, globLister func() []blueprint.GlobPath) ([]byte, []error) {
 	ctx := blueprint.NewContext()
 	ctx.RegisterSingletonType("glob", func() blueprint.Singleton {
 		return &globSingleton{
@@ -155,7 +155,7 @@ func generateGlobNinjaFile(globLister func() []blueprint.GlobPath) ([]byte, []er
 		}
 	})
 
-	extraDeps, errs := ctx.ResolveDependencies(nil)
+	extraDeps, errs := ctx.ResolveDependencies(config)
 	if len(extraDeps) > 0 {
 		return nil, []error{fmt.Errorf("shouldn't have extra deps")}
 	}
@@ -163,7 +163,7 @@ func generateGlobNinjaFile(globLister func() []blueprint.GlobPath) ([]byte, []er
 		return nil, errs
 	}
 
-	extraDeps, errs = ctx.PrepareBuildActions(nil)
+	extraDeps, errs = ctx.PrepareBuildActions(config)
 	if len(extraDeps) > 0 {
 		return nil, []error{fmt.Errorf("shouldn't have extra deps")}
 	}
diff --git a/bootstrap/minibp/main.go b/bootstrap/minibp/main.go
index 1714739..781f13a 100644
--- a/bootstrap/minibp/main.go
+++ b/bootstrap/minibp/main.go
@@ -30,18 +30,29 @@ func init() {
 }
 
 type Config struct {
-	generatingPrimaryBuilder bool
+	buildDir      string
+	ninjaBuildDir string
 }
 
 func (c Config) GeneratingPrimaryBuilder() bool {
-	return c.generatingPrimaryBuilder
+	return true
+}
+
+func (c Config) SrcDir() string {
+	return "."
+}
+
+func (c Config) BuildDir() string {
+	return c.buildDir
+}
+
+func (c Config) NinjaBuildDir() string {
+	return c.ninjaBuildDir
 }
 
 func (c Config) RemoveAbandonedFilesUnder() (under, exempt []string) {
-	if c.generatingPrimaryBuilder {
-		under = []string{filepath.Join(bootstrap.BuildDir, ".bootstrap")}
-		exempt = []string{filepath.Join(bootstrap.BuildDir, ".bootstrap", "build.ninja")}
-	}
+	under = []string{filepath.Join(bootstrap.BuildDir, ".bootstrap")}
+	exempt = []string{filepath.Join(bootstrap.BuildDir, ".bootstrap", "build.ninja")}
 	return
 }
 
@@ -54,7 +65,8 @@ func main() {
 	}
 
 	config := Config{
-		generatingPrimaryBuilder: !runAsPrimaryBuilder,
+		buildDir:      bootstrap.BuildDir,
+		ninjaBuildDir: bootstrap.NinjaBuildDir,
 	}
 
 	bootstrap.Main(ctx, config)
diff --git a/bootstrap/writedocs.go b/bootstrap/writedocs.go
index 4edbcab..99df32f 100644
--- a/bootstrap/writedocs.go
+++ b/bootstrap/writedocs.go
@@ -15,7 +15,7 @@ import (
 
 // ModuleTypeDocs returns a list of bpdoc.ModuleType objects that contain information relevant
 // to generating documentation for module types supported by the primary builder.
-func ModuleTypeDocs(ctx *blueprint.Context, factories map[string]reflect.Value) ([]*bpdoc.Package, error) {
+func ModuleTypeDocs(ctx *blueprint.Context, config interface{}, factories map[string]reflect.Value) ([]*bpdoc.Package, error) {
 	// Find the module that's marked as the "primary builder", which means it's
 	// creating the binary that we'll use to generate the non-bootstrap
 	// build.ninja file.
@@ -55,7 +55,7 @@ func ModuleTypeDocs(ctx *blueprint.Context, factories map[string]reflect.Value)
 		switch m := module.(type) {
 		case (*goPackage):
 			pkgFiles[m.properties.PkgPath] = pathtools.PrefixPaths(m.properties.Srcs,
-				filepath.Join(SrcDir, ctx.ModuleDir(m)))
+				filepath.Join(config.(BootstrapConfig).SrcDir(), ctx.ModuleDir(m)))
 		default:
 			panic(fmt.Errorf("unknown dependency type %T", module))
 		}
@@ -75,8 +75,8 @@ func ModuleTypeDocs(ctx *blueprint.Context, factories map[string]reflect.Value)
 	return bpdoc.AllPackages(pkgFiles, mergedFactories, ctx.ModuleTypePropertyStructs())
 }
 
-func writeDocs(ctx *blueprint.Context, filename string) error {
-	moduleTypeList, err := ModuleTypeDocs(ctx, nil)
+func writeDocs(ctx *blueprint.Context, config interface{}, filename string) error {
+	moduleTypeList, err := ModuleTypeDocs(ctx, config, nil)
 	if err != nil {
 		return err
 	}