From f1e177fee7f747115c4f47c05c4d421133934b95 Mon Sep 17 00:00:00 2001
From: Margo Crawford <margaretc@vmware.com>
Date: Tue, 5 Jan 2021 14:02:28 -0800
Subject: [PATCH] Copyright year precommit hook

Signed-off-by: Andrew Keesler <akeesler@vmware.com>
---
 .pre-commit-config.yaml      |  4 ++++
 .pre-commit-hooks.yaml       |  4 ++++
 hack/check-copyright-year.sh | 21 +++++++++++++++++++++
 3 files changed, 29 insertions(+)
 create mode 100644 .pre-commit-hooks.yaml
 create mode 100644 hack/check-copyright-year.sh

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 50581ddd..869045d4 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,3 +15,7 @@ repos:
   - id: detect-private-key
     exclude: testdata
   - id: mixed-line-ending
+- repo: .
+  rev: main
+  hooks:
+  - id: validate-copyright-year
diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
new file mode 100644
index 00000000..b8af8e46
--- /dev/null
+++ b/.pre-commit-hooks.yaml
@@ -0,0 +1,4 @@
+- id: validate-copyright-year
+  name: Validate copyright year
+  entry: hack/check-copyright-year.sh
+  language: script
diff --git a/hack/check-copyright-year.sh b/hack/check-copyright-year.sh
new file mode 100644
index 00000000..5d282486
--- /dev/null
+++ b/hack/check-copyright-year.sh
@@ -0,0 +1,21 @@
+#
+# Check if copyright statements include the current year
+#
+files=git diff --cached --name-only
+year=date +"%Y"
+
+for f in $files; do
+    head -10 $f | grep -i copyright 2>&1 1>/dev/null || continue
+
+    if ! grep -i -e "copyright.*$year" $f 2>&1 1>/dev/null; then
+        missing_copyright_files="$missing_copyright_files $f"
+    fi
+done
+
+if [ -n "$missing_copyright_files" ]; then
+    echo "$year is missing in the copyright notice of the following files:"
+    for f in $missing_copyright_files; do
+        echo "    $f"
+    done 
+    exit 1
+fi