[misc] Add git-hooks

CONTRIBUTE.md

@@ -7,6 +7,10 @@
 3. Activate your dev environment with `source .venv/bin/activate`
 4. Install with `pip install .`
 5. Install development dependencies with `pip install tox black`
+6. Add git-hook to run test and stylecheck before commmit with
+   `ln -s ../../git-hooks/pre-commit .git/hooks/pre-commit`
+7. Add git-hook to check commmit message format with
+   `ln -s ../../git-hooks/commit-msg .git/hooks/commit-msg`
 
 ### Build and Test Cycle
 

git-hooks/commit-msg

@@ -0,0 +1,13 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
+#
+# SPDX-License-Identifier: 0BSD
+#
+# client-side git-hook - checks commit message style
+
+head -n 1 "$1" | egrep -x '\[[^]]+\] [[:upper:]].*[^.]' > /dev/null
+if [ $? -ne 0 ]; then
+    echo "commit message doesn't match style" >&2
+    exit 1
+fi

git-hooks/pre-commit

@@ -0,0 +1,9 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
+#
+# SPDX-License-Identifier: 0BSD
+#
+# client-side git-hook - run tests and stylechecker
+
+exec tox

git-hooks/update

@@ -0,0 +1,36 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 by Thomas Lindner <tom@dl6tom.de>
+#
+# SPDX-License-Identifier: 0BSD
+#
+# server-side git-hook - checks branch policy
+
+refname="$1"
+oldrev="$2"
+newrev="$3"
+
+forbid_merge_commmits() {
+    if [ "$(git log --merges "$oldrev..$newrev")" ]; then
+        echo "merge commmits not allowed" >&2
+        exit 1
+    fi
+}
+
+only_ff_to() {
+    ff_branch="$1"
+    git rev-list "$oldrev..$ff_branch" | fgrep -x "$newrev" > /dev/null
+    if [ $? -ne 0 ]; then
+        echo "only fast-forward to $ff_branch allowed" >&2
+        exit 1
+    fi
+}
+
+case "$refname" in
+    refs/heads/master)
+        only_ff_to development
+        ;;
+    refs/heads/*)
+        forbid_merge_commits
+        ;;
+esac