From 53da09d924b2068904929c760ddc243b87247d20 Mon Sep 17 00:00:00 2001
From: Steffen Hiller <steffen@github.com>
Date: Tue, 11 Dec 2018 11:06:09 +0100
Subject: [PATCH] Add first version of block skip checks hook

---
 pre-receive-hooks/block_skip_checks.sh | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100755 pre-receive-hooks/block_skip_checks.sh

diff --git a/pre-receive-hooks/block_skip_checks.sh b/pre-receive-hooks/block_skip_checks.sh
new file mode 100755
index 000000000..c54d6d4d0
--- /dev/null
+++ b/pre-receive-hooks/block_skip_checks.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+#
+# Check and reject commits with "skip-checks: true" trailer lines.
+# 
+# This hook basically disables the following feature:
+# https://help.github.com/articles/about-status-checks/#skipping-and-requesting-checks-for-individual-commits
+
+ERROR_MSG="[POLICY] Skipping checks is not allowed. Please remove trailer lines with \"skip-checks: true\"."
+
+while read OLDREV NEWREV REFNAME ; do
+  for COMMIT in `git rev-list $OLDREV..$NEWREV`;
+  do
+    MESSAGE=`git cat-file commit $COMMIT | git interpret-trailers --parse`
+    if echo $MESSAGE | grep -iq "skip-checks: true"; then
+      echo "$ERROR_MSG" >&2
+      exit 1
+    fi
+  done
+done
+exit 0
\ No newline at end of file