cmd/updatestd: skip repos without internal-branch.go1.n-vendor branch

In our previous process, we used to preemptively create an
internal-branch.go1.n-vendor branch for every vendored golang.org/x
repo that's a direct dependency of either the std or cmd module.
But now we create those branches on demand, only when they're needed.
So, stop treating a missing branch as an error to report, even if it
is a direct dependency of std or cmd.

For golang/go#36905.

Change-Id: Id5d2b3b34b286ae7d01b1b9e48c6d98d7c72df07
Reviewed-on: https://go-review.googlesource.com/c/build/+/643517
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/updatestd/updatestd.go

diff --git a/cmd/updatestd/updatestd.go b/cmd/updatestd/updatestd.go
index 8bdeadd..b525533 100644
--- a/cmd/updatestd/updatestd.go
+++ b/cmd/updatestd/updatestd.go
@@ -41,7 +41,7 @@
 		flag.PrintDefaults()
 	}
 	goroot := flag.String("goroot", "", "path to a working copy of https://go.googlesource.com/go (required)")
-	branch := flag.String("branch", "", "branch to target, such as master or release-branch.go1.Y (required)")
+	branch := flag.String("branch", "", "branch to target, such as master or internal-branch.go1.Y-vendor (required)")
 	flag.Parse()
 	if flag.NArg() != 0 || *goroot == "" || *branch == "" {
 		flag.Usage()
@@ -172,11 +172,8 @@
 		gerritProj := m.Path[len("golang.org/x/"):]
 		hash, ok := w.ProjectHashes[gerritProj]
 		if !ok {
-			if m.Indirect {
-				log.Printf("skipping %s because branch %s doesn't exist and it's indirect\n", m.Path, w.Branch)
-				continue
-			}
-			return fmt.Errorf("no hash for Gerrit project %q", gerritProj)
+			log.Printf("skipping %s because branch %s doesn't exist\n", m.Path, w.Branch)
+			continue
 		}
 		goGet = append(goGet, m.Path+"@"+hash)
 	}
@@ -222,9 +219,8 @@
 }
 
 type module struct {
-	Path     string // Module path.
-	Main     bool   // Is this the main module?
-	Indirect bool   // Is this module only an indirect dependency of main module?
+	Path string // Module path.
+	Main bool   // Is this the main module?
 }
 
 // gorootVersion reads the GOROOT/src/internal/goversion/goversion.go

cmd/updatestd/updatestd_test.go

diff --git a/cmd/updatestd/updatestd_test.go b/cmd/updatestd/updatestd_test.go
index c89ac73..a9e5891 100644
--- a/cmd/updatestd/updatestd_test.go
+++ b/cmd/updatestd/updatestd_test.go
@@ -24,9 +24,8 @@
 	// Check that buildList(".") returns sensible results.
 	main, deps := buildList(".")
 	if want := (module{
-		Path:     "golang.org/x/build",
-		Main:     true,
-		Indirect: false,
+		Path: "golang.org/x/build",
+		Main: true,
 	}); main != want {
 		t.Errorf("got main = %+v, want %+v", main, want)
 	}