Update licensegen to output the current year for new files

.github/workflows/linters.yml

@@ -59,12 +59,30 @@ jobs:
         run: |
           make lint-api
 
+  lint-copyright:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+          check-latest: true
+
+      - name: Check new go files for license
+        run: |
+          git fetch origin main
+          make copyright-check
+
   linters-succeed:
     name: All Linters Succeed
     needs:
       - lint-api
       - lint-protos
       - lint-actions
+      - lint-copyright
     runs-on: ubuntu-latest
     if: always()
     env:

Makefile

@@ -310,6 +310,17 @@ temporal-server-debug: $(ALL_SRC)
 copyright-check:
 	@printf $(COLOR) "Check license header..."
 	@go run ./cmd/tools/copyright/licensegen.go --verifyOnly
+	@check_failed=false; \
+	current_year=$$(date +'%Y'); \
+	for file in $$(git diff --diff-filter=A --name-only origin/main HEAD | grep '\.go$$'); do \
+		if ! grep -q "Copyright (c) $$current_year Temporal Technologies Inc." "$$file"; then \
+			printf $(RED) "New file $$file missing license information or information is invalid."; \
+			check_failed=true; \
+		fi; \
+	done; \
+	if [ "$$check_failed" = true ]; then \
+		printf $(RED) "Copyright check failed, aborting" && exit 1; \
+	fi
 
 copyright:
 	@printf $(COLOR) "Fix license header..."

cmd/tools/copyright/licensegen.go

@@ -30,7 +30,9 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
+	"time"
 )
 
 type (
@@ -195,5 +197,8 @@ func commentOutLines(str string) (string, error) {
 	if err := scanner.Err(); err != nil {
 		return "", err
 	}
-	return strings.Join(lines, ""), nil
+	licenseToOutput := strings.Join(lines, "")
+	licenseToOutput = strings.Replace(licenseToOutput, "// Copyright (c) 2020 Uber Technologies, Inc.\n//\n", "", 1)
+	licenseToOutput = strings.Replace(licenseToOutput, "2020", strconv.Itoa(time.Now().Year()), 1)
+	return licenseToOutput, nil
 }