dashboard: add macOS 11.0 Big Sur builder

This change adds macOS 11.0 Big Sur builder to the dashboard. It will
not spawn an instance on the older MacStadium cluster which we are
migrating away from. It will be marked with a known issue until until
we have migrated away from the old cluster and makemac has been
updated to process the new macOS versioning convention.

Updates golang/go#40762
Updates golang/go#40757
Updates golang/go#40761

Change-Id: I24ce615a2c0c55dd75beed4f821119d4058ad8af
Reviewed-on: https://go-review.googlesource.com/c/build/+/288192
Trust: Carlos Amedee <[email protected]>
Run-TryBot: Carlos Amedee <[email protected]>
TryBot-Result: Go Bot <[email protected]>
Reviewed-by: Alexander Rakoczy <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: cagedmantis

dashboard/builders.go

@@ -503,14 +503,24 @@ var Hosts = map[string]*HostConfig{
 	},
 	"host-darwin-10_15": &HostConfig{
 		IsReverse: true,
-		ExpectNum: 7,
+		ExpectNum: 6,
 		Notes:     "MacStadium macOS Catalina (10.15) VM under VMWare ESXi",
 		env: []string{
 			"GOROOT_BOOTSTRAP=/Users/gopher/goboot", // Go 1.12.1
 		},
 		SSHUsername:     "gopher",
 		HermeticReverse: true, // we destroy the VM when done & let cmd/makemac recreate
 	},
+	"host-darwin-amd64-11_0": &HostConfig{
+		IsReverse: true,
+		ExpectNum: 1,
+		Notes:     "MacStadium macOS Big Sur (11.0) VM under VMWare ESXi",
+		env: []string{
+			"GOROOT_BOOTSTRAP=/Users/gopher/goboot", // Go 1.13.4
+		},
+		SSHUsername:     "gopher",
+		HermeticReverse: true, // we destroy the VM when done & let cmd/makemac recreate
+	},
 	"host-darwin-arm64-11_0-toothrot": &HostConfig{
 		IsReverse: true,
 		ExpectNum: 2,
@@ -2294,6 +2304,13 @@ func init() {
 		distTestAdjust: macTestPolicy,
 		buildsRepo:     defaultPlusExpBuild,
 	})
+	addBuilder(BuildConfig{
+		Name:           "darwin-amd64-11_0",
+		HostType:       "host-darwin-amd64-11_0",
+		distTestAdjust: macTestPolicy,
+		buildsRepo:     defaultPlusExpBuild,
+		KnownIssue:     40762,
+	})
 	addBuilder(BuildConfig{
 		Name:           "darwin-amd64-nocgo",
 		HostType:       "host-darwin-10_15",

dashboard/builders_test.go

@@ -890,7 +890,7 @@ func TestTryBotsCompileAllPorts(t *testing.T) {
 func TestExpectedMacstadiumVMCount(t *testing.T) {
 	got := 0
 	for host, config := range Hosts {
-		if strings.HasPrefix(host, "host-darwin-10_") {
+		if strings.HasPrefix(host, "host-darwin-10_") || strings.HasPrefix(host, "host-darwin-amd64-") {
 			got += config.ExpectNum
 		}
 	}