From 8b6ca52e87525bbbaf2f4e7b75d80b3104f753a0 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 27 Aug 2017 22:32:18 +0200
Subject: [PATCH] Add applypatch-msg hook for Signed-off-by line checking

---
 .../hooks/applypatch-msg.check-signed-off.sh  | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 scripts/hooks/applypatch-msg.check-signed-off.sh

diff --git a/scripts/hooks/applypatch-msg.check-signed-off.sh b/scripts/hooks/applypatch-msg.check-signed-off.sh
new file mode 100644
index 00000000..3cf81abb
--- /dev/null
+++ b/scripts/hooks/applypatch-msg.check-signed-off.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+#
+# An hook script to check the commit log message taken by
+# applypatch from an e-mail message for proper "Signed-off-by" line(s).
+#
+# To enable this hook, copy this file to ".git/hooks/applypatch-msg" and make it
+# executable.
+
+#
+# This hook is used when applying patches which are send via mail, to verify the
+# Signed-off-by line is in the commit message.
+#
+
+. git-sh-setup
+
+RED='\e[0;31m'      # Red
+YELLOW='\e[0;33m'   # Yellow
+NORMAL='\e[0m'      # Text Reset
+
+warn() {
+    echo -e >&2 "${YELLOW}$*${DEFAULT}"
+}
+
+abort() {
+    echo -e >&2 "${RED}$*${DEFAULT}"
+    exit 1
+}
+
+headline=$(head -n 1 $1 | wc -c)
+[[ $headline -gt 50 ]] && warn "Headline of patch longer than 50 chars"
+
+grep "^Signed-off-by" $1 >/dev/null 2>/dev/null && abort "No Signed-off-by line"
+