Start collecting build configuration metrics.

This is an initial CL that collects the environment variables
USE_GOMA and USE_RBE. This is a needed metric to determine how
many users are currently using GOMA so we can help them migrate
to RBE.

Bug: b/163598127
Test: m nothing and checked soong_metrics
Change-Id: I39536eabad01aafbb3bd7182515d72230b36f658
diff --git a/ui/build/config.go b/ui/build/config.go
index b263a98..bd3ad0c 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -23,6 +23,9 @@
 	"time"
 
 	"android/soong/shared"
+	"github.com/golang/protobuf/proto"
+
+	smpb "android/soong/ui/metrics/metrics_proto"
 )
 
 type Config struct{ *configImpl }
@@ -263,7 +266,9 @@
 		}
 	}
 
-	return Config{ret}
+	c := Config{ret}
+	storeConfigMetrics(ctx, c)
+	return c
 }
 
 // NewBuildActionConfig returns a build configuration based on the build action. The arguments are
@@ -272,6 +277,20 @@
 	return NewConfig(ctx, getConfigArgs(action, dir, ctx, args)...)
 }
 
+// storeConfigMetrics selects a set of configuration information and store in
+// the metrics system for further analysis.
+func storeConfigMetrics(ctx Context, config Config) {
+	if ctx.Metrics == nil {
+		return
+	}
+
+	b := &smpb.BuildConfig{
+		UseGoma: proto.Bool(config.UseGoma()),
+		UseRbe:  proto.Bool(config.UseRBE()),
+	}
+	ctx.Metrics.BuildConfig(b)
+}
+
 // getConfigArgs processes the command arguments based on the build action and creates a set of new
 // arguments to be accepted by Config.
 func getConfigArgs(action BuildAction, dir string, ctx Context, args []string) []string {
diff --git a/ui/metrics/metrics.go b/ui/metrics/metrics.go
index 12f74dd..f5552a3 100644
--- a/ui/metrics/metrics.go
+++ b/ui/metrics/metrics.go
@@ -66,6 +66,10 @@
 	}
 }
 
+func (m *Metrics) BuildConfig(b *soong_metrics_proto.BuildConfig) {
+	m.metrics.BuildConfig = b
+}
+
 func (m *Metrics) SetMetadataMetrics(metadata map[string]string) {
 	for k, v := range metadata {
 		switch k {
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index a39d1a8..d7c53ec 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -152,7 +152,7 @@
 }
 
 func (ModuleTypeInfo_BuildSystem) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{2, 0}
+	return fileDescriptor_6039342a2ba47b72, []int{3, 0}
 }
 
 type MetricsBase struct {
@@ -199,6 +199,7 @@
 	// The metrics for the whole build
 	Total                *PerfInfo          `protobuf:"bytes,21,opt,name=total" json:"total,omitempty"`
 	SoongBuildMetrics    *SoongBuildMetrics `protobuf:"bytes,22,opt,name=soong_build_metrics,json=soongBuildMetrics" json:"soong_build_metrics,omitempty"`
+	BuildConfig          *BuildConfig       `protobuf:"bytes,23,opt,name=build_config,json=buildConfig" json:"build_config,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
 	XXX_unrecognized     []byte             `json:"-"`
 	XXX_sizecache        int32              `json:"-"`
@@ -388,6 +389,60 @@
 	return nil
 }
 
+func (m *MetricsBase) GetBuildConfig() *BuildConfig {
+	if m != nil {
+		return m.BuildConfig
+	}
+	return nil
+}
+
+type BuildConfig struct {
+	UseGoma              *bool    `protobuf:"varint,1,opt,name=use_goma,json=useGoma" json:"use_goma,omitempty"`
+	UseRbe               *bool    `protobuf:"varint,2,opt,name=use_rbe,json=useRbe" json:"use_rbe,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *BuildConfig) Reset()         { *m = BuildConfig{} }
+func (m *BuildConfig) String() string { return proto.CompactTextString(m) }
+func (*BuildConfig) ProtoMessage()    {}
+func (*BuildConfig) Descriptor() ([]byte, []int) {
+	return fileDescriptor_6039342a2ba47b72, []int{1}
+}
+
+func (m *BuildConfig) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BuildConfig.Unmarshal(m, b)
+}
+func (m *BuildConfig) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BuildConfig.Marshal(b, m, deterministic)
+}
+func (m *BuildConfig) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BuildConfig.Merge(m, src)
+}
+func (m *BuildConfig) XXX_Size() int {
+	return xxx_messageInfo_BuildConfig.Size(m)
+}
+func (m *BuildConfig) XXX_DiscardUnknown() {
+	xxx_messageInfo_BuildConfig.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BuildConfig proto.InternalMessageInfo
+
+func (m *BuildConfig) GetUseGoma() bool {
+	if m != nil && m.UseGoma != nil {
+		return *m.UseGoma
+	}
+	return false
+}
+
+func (m *BuildConfig) GetUseRbe() bool {
+	if m != nil && m.UseRbe != nil {
+		return *m.UseRbe
+	}
+	return false
+}
+
 type PerfInfo struct {
 	// The description for the phase/action/part while the tool running.
 	Desc *string `protobuf:"bytes,1,opt,name=desc" json:"desc,omitempty"`
@@ -410,7 +465,7 @@
 func (m *PerfInfo) String() string { return proto.CompactTextString(m) }
 func (*PerfInfo) ProtoMessage()    {}
 func (*PerfInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{1}
+	return fileDescriptor_6039342a2ba47b72, []int{2}
 }
 
 func (m *PerfInfo) XXX_Unmarshal(b []byte) error {
@@ -482,7 +537,7 @@
 func (m *ModuleTypeInfo) String() string { return proto.CompactTextString(m) }
 func (*ModuleTypeInfo) ProtoMessage()    {}
 func (*ModuleTypeInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{2}
+	return fileDescriptor_6039342a2ba47b72, []int{3}
 }
 
 func (m *ModuleTypeInfo) XXX_Unmarshal(b []byte) error {
@@ -540,7 +595,7 @@
 func (m *CriticalUserJourneyMetrics) String() string { return proto.CompactTextString(m) }
 func (*CriticalUserJourneyMetrics) ProtoMessage()    {}
 func (*CriticalUserJourneyMetrics) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{3}
+	return fileDescriptor_6039342a2ba47b72, []int{4}
 }
 
 func (m *CriticalUserJourneyMetrics) XXX_Unmarshal(b []byte) error {
@@ -587,7 +642,7 @@
 func (m *CriticalUserJourneysMetrics) String() string { return proto.CompactTextString(m) }
 func (*CriticalUserJourneysMetrics) ProtoMessage()    {}
 func (*CriticalUserJourneysMetrics) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{4}
+	return fileDescriptor_6039342a2ba47b72, []int{5}
 }
 
 func (m *CriticalUserJourneysMetrics) XXX_Unmarshal(b []byte) error {
@@ -635,7 +690,7 @@
 func (m *SoongBuildMetrics) String() string { return proto.CompactTextString(m) }
 func (*SoongBuildMetrics) ProtoMessage()    {}
 func (*SoongBuildMetrics) Descriptor() ([]byte, []int) {
-	return fileDescriptor_6039342a2ba47b72, []int{5}
+	return fileDescriptor_6039342a2ba47b72, []int{6}
 }
 
 func (m *SoongBuildMetrics) XXX_Unmarshal(b []byte) error {
@@ -696,6 +751,7 @@
 	proto.RegisterEnum("soong_build_metrics.MetricsBase_Arch", MetricsBase_Arch_name, MetricsBase_Arch_value)
 	proto.RegisterEnum("soong_build_metrics.ModuleTypeInfo_BuildSystem", ModuleTypeInfo_BuildSystem_name, ModuleTypeInfo_BuildSystem_value)
 	proto.RegisterType((*MetricsBase)(nil), "soong_build_metrics.MetricsBase")
+	proto.RegisterType((*BuildConfig)(nil), "soong_build_metrics.BuildConfig")
 	proto.RegisterType((*PerfInfo)(nil), "soong_build_metrics.PerfInfo")
 	proto.RegisterType((*ModuleTypeInfo)(nil), "soong_build_metrics.ModuleTypeInfo")
 	proto.RegisterType((*CriticalUserJourneyMetrics)(nil), "soong_build_metrics.CriticalUserJourneyMetrics")
@@ -703,69 +759,74 @@
 	proto.RegisterType((*SoongBuildMetrics)(nil), "soong_build_metrics.SoongBuildMetrics")
 }
 
-func init() { proto.RegisterFile("metrics.proto", fileDescriptor_6039342a2ba47b72) }
+func init() {
+	proto.RegisterFile("metrics.proto", fileDescriptor_6039342a2ba47b72)
+}
 
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+	0xc8, 0x2e, 0xb8, 0xbf, 0x31, 0x9d, 0x84, 0xb2, 0xc8, 0x54, 0x40, 0xee, 0xa2, 0x6e, 0x19, 0x3e,
+	0x2d, 0x32, 0x45, 0xde, 0x00, 0x58, 0x26, 0x8a, 0xd7, 0xee, 0x22, 0x76, 0x11, 0xad, 0xd4, 0x59,
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+	0x49, 0xf0, 0xb0, 0xeb, 0x7c, 0x5e, 0x68, 0xb9, 0xe4, 0x02, 0xe6, 0x8d, 0xa2, 0xe0, 0x2b, 0xb4,
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+	0x00, 0x2b, 0x56, 0x15, 0x89, 0x6c, 0x9c, 0x5c, 0x06, 0xeb, 0x68, 0xd8, 0x9d, 0x6b, 0x88, 0xc2,
+	0x01, 0xf2, 0xa8, 0x37, 0x9a, 0x2d, 0x7a, 0x2f, 0x61, 0xe5, 0xd6, 0xd3, 0x6f, 0x41, 0xe3, 0xfc,
+	0xf4, 0x80, 0xfa, 0xf7, 0x48, 0x1b, 0x5c, 0xf3, 0xb5, 0x7f, 0xb0, 0x77, 0x7e, 0xe8, 0x3b, 0xa4,
+	0x09, 0x66, 0x5c, 0xf8, 0x0b, 0xbd, 0x37, 0xd0, 0xc0, 0xe6, 0xf0, 0xa0, 0x6a, 0x76, 0xff, 0x9e,
+	0x41, 0xfb, 0xf4, 0xd8, 0x77, 0x88, 0x0b, 0x4b, 0x7d, 0x7a, 0xbc, 0xf3, 0xca, 0x5f, 0x30, 0xb1,
+	0xf7, 0xaf, 0x77, 0xfc, 0x45, 0x02, 0xb0, 0xfc, 0xfe, 0xf5, 0x4e, 0xb8, 0xf3, 0xca, 0x6f, 0xf4,
+	0xfa, 0xe0, 0xd5, 0x72, 0x31, 0xd3, 0xb4, 0x50, 0x3c, 0xbc, 0x14, 0x29, 0xc3, 0x99, 0xdb, 0xa2,
+	0xcd, 0x42, 0xf1, 0x43, 0x91, 0x32, 0xd3, 0x7c, 0x06, 0x92, 0x23, 0x8e, 0x73, 0xb6, 0x45, 0x97,
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+	0x36, 0xb1, 0x68, 0x03, 0xd1, 0x96, 0x09, 0x20, 0xb8, 0x01, 0x90, 0xf2, 0x54, 0xc8, 0x9b, 0xb0,
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+	0x2e, 0x26, 0xfc, 0xec, 0x26, 0xe7, 0x98, 0xd5, 0xaf, 0xd5, 0xd5, 0xa8, 0x1b, 0xa5, 0x79, 0x8a,
+	0xd9, 0x75, 0xb6, 0x5f, 0xcc, 0x9f, 0x21, 0xb7, 0xa4, 0xf6, 0xa6, 0x4e, 0x51, 0x56, 0x9b, 0x26,
+	0xa3, 0x59, 0x94, 0x7c, 0x0d, 0x5e, 0x8a, 0x9a, 0x50, 0xdf, 0xe4, 0x55, 0x95, 0x90, 0x4e, 0x6d,
+	0xc8, 0x37, 0xd0, 0xc9, 0x8a, 0x34, 0x14, 0xe3, 0xd0, 0x06, 0x15, 0xd6, 0xdb, 0xa6, 0x2b, 0x59,
+	0x91, 0x0e, 0xc7, 0x76, 0x3f, 0xd5, 0x7b, 0x51, 0xde, 0x44, 0xe9, 0x7a, 0xeb, 0x3a, 0x5d, 0x58,
+	0x3a, 0x1d, 0x0e, 0x4f, 0xcc, 0xbd, 0xb7, 0xa0, 0x71, 0xdc, 0x3f, 0x3a, 0xf0, 0x17, 0x7a, 0x13,
+	0x78, 0x3c, 0x90, 0x89, 0x4e, 0x22, 0x36, 0x39, 0x57, 0x5c, 0xfe, 0x24, 0x0a, 0x99, 0xf1, 0x9b,
+	0xaa, 0x1b, 0xab, 0x43, 0x77, 0x6a, 0x87, 0xbe, 0x0b, 0xcd, 0xaa, 0xdb, 0x17, 0xfe, 0xa7, 0x39,
+	0x6b, 0x53, 0x94, 0x56, 0x82, 0xde, 0x08, 0x9e, 0xcc, 0xd9, 0x4d, 0xcd, 0x9a, 0xbf, 0x11, 0x15,
+	0x1f, 0x54, 0xe0, 0xe0, 0x0b, 0x9e, 0x7f, 0xb2, 0xff, 0x9d, 0x2d, 0x45, 0x71, 0xef, 0x0f, 0x07,
+	0x56, 0xff, 0xf5, 0xd4, 0x48, 0x00, 0xcd, 0xea, 0xdc, 0x1c, 0x3c, 0xb7, 0x6a, 0x49, 0x1e, 0x43,
+	0xab, 0xfc, 0x2d, 0xb2, 0x05, 0xb5, 0xe9, 0x74, 0x4d, 0xbe, 0x85, 0x55, 0x7c, 0xee, 0x21, 0x9b,
+	0x4c, 0x44, 0x14, 0x46, 0xa2, 0xc8, 0x74, 0xd9, 0x67, 0xf7, 0x11, 0xe8, 0x9b, 0xf8, 0xc0, 0x84,
+	0xc9, 0x26, 0xf8, 0x75, 0xae, 0x4a, 0x3e, 0x55, 0x4d, 0xd7, 0x99, 0x51, 0x4f, 0x93, 0x4f, 0xdc,
+	0x0c, 0xff, 0x94, 0x5d, 0x87, 0x57, 0x9c, 0xe5, 0x96, 0x66, 0xbb, 0xcf, 0x4b, 0xd9, 0xf5, 0x8f,
+	0x9c, 0xe5, 0x86, 0xb3, 0xf7, 0xf0, 0x97, 0x72, 0xbe, 0x94, 0x75, 0x87, 0xf8, 0xff, 0xe7, 0xef,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0x0a, 0x03, 0x26, 0x59, 0x0f, 0x09, 0x00, 0x00,
 }
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 50810eb..6559ba3 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -94,6 +94,14 @@
   optional PerfInfo total = 21;
 
   optional SoongBuildMetrics soong_build_metrics = 22;
+
+  optional BuildConfig build_config = 23;
+}
+
+message BuildConfig {
+  optional bool use_goma = 1;
+
+  optional bool use_rbe = 2;
 }
 
 message PerfInfo {
@@ -159,4 +167,4 @@
 
   // The approximate maximum size of the heap in soong_build in bytes.
   optional uint64 max_heap_size = 5;
-}
\ No newline at end of file
+}