From 37c398c51eb5a049ef4351ce3a4245deddbc44c4 Mon Sep 17 00:00:00 2001
From: Carlos Amedee <carlos@golang.org>
Date: Wed, 11 May 2022 16:33:59 -0400
Subject: [PATCH] internal/gomote: moves logic to server from client

These changes are being made in an attempt to move logic from the
client to the server.
- Changes the function which extracts the object name from a URL.
- Moves setting the environment variables to the server in ExecuteCommand endpoint.

For golang/go#47521
Updates golang/go#48742

Change-Id: I4fa370a1b3c949bd5913491d1650d131577ff30f
Reviewed-on: https://go-review.googlesource.com/c/build/+/406014
Reviewed-by: Heschi Kreinick <heschi@google.com>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
---
 internal/gomote/gomote.go           |  21 +-
 internal/gomote/gomote_test.go      |  14 +-
 internal/gomote/protos/gomote.pb.go | 332 ++++++++++++++--------------
 internal/gomote/protos/gomote.proto |   2 +
 4 files changed, 191 insertions(+), 178 deletions(-)

diff --git a/internal/gomote/gomote.go b/internal/gomote/gomote.go
index d3986c3e..3dc15002 100644
--- a/internal/gomote/gomote.go
+++ b/internal/gomote/gomote.go
@@ -26,6 +26,7 @@ import (
 	"golang.org/x/build/internal/access"
 	"golang.org/x/build/internal/coordinator/remote"
 	"golang.org/x/build/internal/coordinator/schedule"
+	"golang.org/x/build/internal/envutil"
 	"golang.org/x/build/internal/gomote/protos"
 	"golang.org/x/build/types"
 	"golang.org/x/crypto/ssh"
@@ -265,11 +266,19 @@ func (s *Server) ExecuteCommand(req *protos.ExecuteCommandRequest, stream protos
 	if err != nil {
 		return status.Errorf(codes.Unauthenticated, "request does not contain the required authentication")
 	}
-	_, bc, err := s.sessionAndClient(req.GetGomoteId(), creds.ID)
+	ses, bc, err := s.sessionAndClient(req.GetGomoteId(), creds.ID)
 	if err != nil {
 		// the helper function returns meaningful GRPC error.
 		return err
 	}
+	builderType := req.GetImitateHostType()
+	if builderType == "" {
+		builderType = ses.BuilderType
+	}
+	conf, ok := dashboard.Builders[builderType]
+	if !ok {
+		return status.Errorf(codes.Internal, "unable to retrieve configuration for instance")
+	}
 	remoteErr, execErr := bc.Exec(stream.Context(), req.GetCommand(), buildlet.ExecOpts{
 		Dir:         req.GetCommand(),
 		SystemLevel: req.GetSystemLevel(),
@@ -283,7 +292,7 @@ func (s *Server) ExecuteCommand(req *protos.ExecuteCommandRequest, stream protos
 			return len(p), nil
 		}},
 		Args:     req.GetArgs(),
-		ExtraEnv: req.GetAppendEnvironment(),
+		ExtraEnv: envutil.Dedup(conf.GOOS(), append(conf.Env(), req.GetAppendEnvironment()...)),
 		Debug:    req.GetDebug(),
 		Path:     req.GetPath(),
 	})
@@ -585,10 +594,6 @@ func objectFromURL(bucketName, url string) (string, error) {
 	if !onObjectStore(bucketName, url) {
 		return "", errors.New("URL not for gomote transfer bucket")
 	}
-	url = strings.TrimPrefix(url, fmt.Sprintf("https://storage.googleapis.com/%s/", bucketName))
-	pos := strings.Index(url, "?")
-	if pos == -1 {
-		return "", errors.New("invalid object store URL")
-	}
-	return url[:pos], nil
+	objectName := strings.TrimPrefix(url, fmt.Sprintf("https://storage.googleapis.com/%s/", bucketName))
+	return objectName, nil
 }
diff --git a/internal/gomote/gomote_test.go b/internal/gomote/gomote_test.go
index 674165e1..809f8759 100644
--- a/internal/gomote/gomote_test.go
+++ b/internal/gomote/gomote_test.go
@@ -941,12 +941,6 @@ func TestWriteTGZFromURLError(t *testing.T) {
 			url:        "go.dev/dl/1_14.tar.gz",
 			wantCode:   codes.PermissionDenied,
 		},
-		{
-			desc:     "invalid gomote staging bucket URL",
-			ctx:      access.FakeContextWithOutgoingIAPAuth(context.Background(), fakeIAP()),
-			url:      fmt.Sprintf("https://storage.googleapis.com/%s/go1.17.6.linux-amd64.tar.gz", testBucketName),
-			wantCode: codes.InvalidArgument,
-		},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.desc, func(t *testing.T) {
@@ -979,22 +973,22 @@ func TestIsPrivilegedUser(t *testing.T) {
 }
 
 func TestObjectFromURL(t *testing.T) {
-	url := `https://storage.googleapis.com/example-bucket/cat.jpeg?X-Goog-Algorithm=GOOG4-RSA-SHA256&X-Goog-Credential=example...`
+	url := `https://storage.googleapis.com/example-bucket/cat.jpeg`
 	bucket := "example-bucket"
 	wantObject := "cat.jpeg"
 	object, err := objectFromURL(bucket, url)
 	if err != nil {
-		t.Fatalf("urlToBucketObject(url) = %q, %s; want %q, no error", object, err, wantObject)
+		t.Fatalf("urlToBucketObject(%q) = %q, %s; want %q, no error", url, object, err, wantObject)
 	}
 	if object != wantObject {
-		t.Fatalf("urlToBucketObject(url) = %q; want %q", object, wantObject)
+		t.Fatalf("urlToBucketObject(%q) = %q; want %q", url, object, wantObject)
 	}
 }
 
 func TestObjectFromURLError(t *testing.T) {
 	bucket := "example-bucket"
 	object := "cat.jpeg"
-	url := fmt.Sprintf("https://storage.googleapis.com/%s/%s", bucket, object)
+	url := fmt.Sprintf("https://bunker.googleapis.com/%s/%s", bucket, object)
 	got, err := objectFromURL(bucket, url)
 	if err == nil {
 		t.Fatalf("urlToBucketObject(url) = %q, nil; want \"\", error", got)
diff --git a/internal/gomote/protos/gomote.pb.go b/internal/gomote/protos/gomote.pb.go
index 27ad233c..13c8425d 100644
--- a/internal/gomote/protos/gomote.pb.go
+++ b/internal/gomote/protos/gomote.pb.go
@@ -383,6 +383,8 @@ type ExecuteCommandRequest struct {
 	Directory string `protobuf:"bytes,7,opt,name=directory,proto3" json:"directory,omitempty"`
 	// The arguments to pass to the command.
 	Args []string `protobuf:"bytes,8,rep,name=args,proto3" json:"args,omitempty"`
+	// Optional alternate builder to act like. It must be a compatible builder.
+	ImitateHostType string `protobuf:"bytes,9,opt,name=imitate_host_type,json=imitateHostType,proto3" json:"imitate_host_type,omitempty"`
 }
 
 func (x *ExecuteCommandRequest) Reset() {
@@ -473,6 +475,13 @@ func (x *ExecuteCommandRequest) GetArgs() []string {
 	return nil
 }
 
+func (x *ExecuteCommandRequest) GetImitateHostType() string {
+	if x != nil {
+		return x.ImitateHostType
+	}
+	return ""
+}
+
 // ExecuteCommandResponse contains data about the executed command.
 type ExecuteCommandResponse struct {
 	state         protoimpl.MessageState
@@ -1582,7 +1591,7 @@ var file_gomote_proto_rawDesc = []byte{
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@@ -1598,167 +1607,170 @@ var file_gomote_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/internal/gomote/protos/gomote.proto b/internal/gomote/protos/gomote.proto
index eb87d630..b370378f 100644
--- a/internal/gomote/protos/gomote.proto
+++ b/internal/gomote/protos/gomote.proto
@@ -100,6 +100,8 @@ message ExecuteCommandRequest {
   string directory = 7;
   // The arguments to pass to the command.
   repeated string args = 8;
+  // Optional alternate builder to act like. It must be a compatible builder.
+  string imitate_host_type = 9;
 }
 
 // ExecuteCommandResponse contains data about the executed command.