From d7586550705760dbea9e49adb1256dda77107ceb Mon Sep 17 00:00:00 2001
From: Esther Schmitz <esther.schmitz@sap.com>
Date: Fri, 5 Jun 2026 16:10:58 +0200
Subject: [PATCH] chore(ci): auto-append Signed-off-by via husky
 prepare-commit-msg

Adds a husky prepare-commit-msg hook that appends a Signed-off-by
trailer using the committer's git identity. DCO checks now pass
without contributors having to remember -s on every commit.

The hook is idempotent (skips if trailer already present) and skips
merge/squash/commit sources where git generates the message itself or
reuses an existing one (e.g. amend, rebase pickup).

Signed-off-by: Esther Schmitz <esther.schmitz@sap.com>
---
 .husky/prepare-commit-msg | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100755 .husky/prepare-commit-msg

diff --git a/.husky/prepare-commit-msg b/.husky/prepare-commit-msg
new file mode 100755
index 0000000000..46bbdc8905
--- /dev/null
+++ b/.husky/prepare-commit-msg
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# SPDX-FileCopyrightText: 2026 SAP SE or an SAP affiliate company and Juno contributors
+# SPDX-License-Identifier: Apache-2.0
+# .husky/prepare-commit-msg
+#
+# Auto-append a Signed-off-by trailer using the committer's git identity,
+# satisfying the DCO check. Skips merge/squash/amend commits and is a no-op
+# if the trailer is already present.
+
+COMMIT_MSG_FILE="$1"
+COMMIT_SOURCE="$2"
+
+case "$COMMIT_SOURCE" in
+  merge|squash|commit) exit 0 ;;
+esac
+
+NAME="$(git config user.name)"
+EMAIL="$(git config user.email)"
+
+if [ -z "$NAME" ] || [ -z "$EMAIL" ]; then
+  exit 0
+fi
+
+TRAILER="Signed-off-by: $NAME <$EMAIL>"
+
+if grep -qFx "$TRAILER" "$COMMIT_MSG_FILE"; then
+  exit 0
+fi
+
+git interpret-trailers --if-exists addIfDifferent --trailer "$TRAILER" --in-place "$COMMIT_MSG_FILE"