internal/task: re-generate license after update dependency

Prevent similar failure from CL 779280.

Change-Id: I6be48c82d9f0549c8166b7dc3c73f22a690c6eb8
Reviewed-on: https://go-review.googlesource.com/c/build/+/779320
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Hongxiang Jiang <hxjiang@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/task/releasegopls.go

diff --git a/internal/task/releasegopls.go b/internal/task/releasegopls.go
index 6533912..dbf2d69 100644
--- a/internal/task/releasegopls.go
+++ b/internal/task/releasegopls.go
@@ -869,8 +869,9 @@
 pwd
 go get -u all
 go mod tidy -compat=1.19
+go generate ./internal/licenses
 `
-	changed, err := executeAndMonitorChange(ctx, r.CloudBuild, "tools", "master", script, []string{"gopls/go.mod", "gopls/go.sum"})
+	changed, err := executeAndMonitorChange(ctx, r.CloudBuild, "tools", "master", script, []string{"gopls/go.mod", "gopls/go.sum", "gopls/internal/licenses/licenses.go"})
 	if err != nil {
 		return "", err
 	}

internal/task/releasegopls_test.go

diff --git a/internal/task/releasegopls_test.go b/internal/task/releasegopls_test.go
index 2d5ce8b..170669f 100644
--- a/internal/task/releasegopls_test.go
+++ b/internal/task/releasegopls_test.go
@@ -1074,7 +1074,10 @@
 		// goplsGoMod specifies the content of gopls/go.mod in x/tools' master
 		// branch before the flow execution.
 		goplsGoMod string
-		release    releaseVersion
+		// license specifies the content of gopls/internal/licenses/licenses.go in
+		// x/tools' master branch before the flow execution.
+		license string
+		release releaseVersion
 
 		// The fields below are the desired states.
 		// wantPrereleaseTag is the expected prerelease tag in x/tools repo
@@ -1086,11 +1089,15 @@
 		// wantGoplsGoMod specifies the desired content of gopls/go.mod in x/tools'
 		// master branch after the flow execution.
 		wantGoplsGoMod string
+		// wantLicense specifies the desired content of gopls/internal/licenses/licenses.go
+		// in x/tools' master branch after the flow execution.
+		wantLicense string
 	}{
 		{
 			name:              "release patch v0.16.3-pre.3, update vscode-go release and master branch",
 			commitTags:        []string{"gopls/v0.16.2", "gopls/v0.16.3-pre.1", "gopls/v0.16.3-pre.2", "gopls/v0.16.3-pre.3"},
 			goplsGoMod:        "foo",
+			license:           "old",
 			release:           releaseVersion{Major: 0, Minor: 16, Patch: 3},
 			wantPrereleaseTag: "gopls/v0.16.3-pre.3",
 			wantCommit: map[string]map[string]bool{
@@ -1102,11 +1109,13 @@
 				},
 			},
 			wantGoplsGoMod: "foo",
+			wantLicense:    "old",
 		},
 		{
 			name:              "release minor v0.17.0-pre.2, update vscode-go release and master branch, update tools gopls go.mod",
 			commitTags:        []string{"gopls/v0.16.0", "gopls/v0.17.0-pre.1", "gopls/v0.17.0-pre.2"},
 			goplsGoMod:        "foo",
+			license:           "old",
 			release:           releaseVersion{Major: 0, Minor: 17, Patch: 0},
 			wantPrereleaseTag: "gopls/v0.17.0-pre.2",
 			wantCommit: map[string]map[string]bool{
@@ -1118,11 +1127,13 @@
 				},
 			},
 			wantGoplsGoMod: "bar",
+			wantLicense:    "new",
 		},
 		{
 			name:              "release minor v0.17.0-pre.2, update vscode-go release and master branch, skip update tools gopls go.mod",
 			commitTags:        []string{"gopls/v0.16.0", "gopls/v0.17.0-pre.1", "gopls/v0.17.0-pre.2"},
 			goplsGoMod:        "bar",
+			license:           "new",
 			release:           releaseVersion{Major: 0, Minor: 17, Patch: 0},
 			wantPrereleaseTag: "gopls/v0.17.0-pre.2",
 			wantCommit: map[string]map[string]bool{
@@ -1134,6 +1145,7 @@
 				},
 			},
 			wantGoplsGoMod: "bar",
+			wantLicense:    "new",
 		},
 	}
 
@@ -1154,8 +1166,9 @@
 
 			tools := NewFakeRepo(t, "tools")
 			initial = tools.Commit(map[string]string{
-				"gopls/go.mod": tc.goplsGoMod,
-				"gopls/go.sum": "\n",
+				"gopls/go.mod":                        tc.goplsGoMod,
+				"gopls/go.sum":                        "\n",
+				"gopls/internal/licenses/licenses.go": tc.license,
 			})
 			tools.Branch(releaseBranch, initial)
 			for i, tag := range tc.commitTags {
@@ -1193,6 +1206,8 @@
 			// installation.
 			// - go run will write "bar" content to file in vscode-go project
 			// containing gopls versions and gopls settings.
+			// - go generate will write "new" content to license file in x/tools
+			// master branch to simulate license changes.
 			var fakeGo = `#!/bin/bash -exu
 
 case "$1" in
@@ -1217,6 +1232,10 @@
 	done
 	exit 0
 	;;
+"generate")
+	echo -n "new" > internal/licenses/licenses.go
+	exit 0
+	;;
 *)
 	echo unexpected command $@
 	exit 1
@@ -1330,6 +1349,12 @@
 					want:   tc.wantGoplsGoMod,
 				},
 				{
+					repo:   "tools",
+					branch: "master",
+					path:   "gopls/internal/licenses/licenses.go",
+					want:   tc.wantLicense,
+				},
+				{
 					repo:   "vscode-go",
 					branch: "master",
 					path:   "extension/src/goToolsInformation.ts",