Add job to check formatting with clang-format 6.0

There's no clang-format 6.0 for available ubunut versions so first
binary packages from older LTS are loaded. One of the packages is
forced to omit python dependency, current packages are named python2.

Relates-To: OCMAM-157
Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

.github/workflows/psv_pipelines.yml

@@ -273,3 +273,48 @@ jobs:
     - name: Commit checker script. Verify commit text
       run: scripts/misc/commit_checker.sh
       shell: bash
+
+  psv-formatting-checker:
+    name: PSV.Clang.Format.Checker
+    runs-on: ubuntu-22.04
+    env:
+      CLANG_FORMAT_FILE: "clang-format.diff"
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+    - name: Setup environment
+      run: |
+        set +x
+        set -e
+        sudo apt-get update
+        sudo apt-get install -y wget libedit2 libtinfo5 python2
+        mkdir _os_deps
+        cd _os_deps
+        wget https://apt.llvm.org/bionic/pool/main/l/llvm-toolchain-6.0/clang-format-6.0_6.0.1~svn334776-1~exp1~20190309042703.125_amd64.deb
+        wget https://apt.llvm.org/bionic/pool/main/l/llvm-toolchain-6.0/libllvm6.0_6.0.1~svn334776-1~exp1~20190309042703.125_amd64.deb
+        wget https://mirrors.edge.kernel.org/ubuntu/pool/main/libf/libffi/libffi6_3.2.1-8_amd64.deb
+        wget https://mirrors.edge.kernel.org/ubuntu/pool/universe/w/what-is-python/python-is-python2_2.7.17-4_all.deb
+        sudo dpkg -i libffi6_3.2.1-9_amd64.deb
+        sudo dpkg -i libllvm6.0_6.0.1~svn334776-1~exp1~20190309042703.125_amd64.deb
+        sudo dpkg -i python-is-python2_2.7.17-4_all.deb
+        sudo dpkg -i clang-format-6.0_6.0.1~svn334776-1~exp1~20190309042703.125_amd64.deb
+        cd ..
+      shell: bash
+    - name: "Clang format checker script"
+      run: ./scripts/misc/clang_format_ci.sh
+      shell: bash
+    - name: Store formatting check results
+      uses: actions/upload-artifact@v4
+      with:
+        name: clang-format-diff
+        path: ${{ env.CLANG_FORMAT_FILE }}
+    - name: Verify check result
+      run: |
+        set +x
+        if [ -s ${CLANG_FORMAT_FILE} ] ; then
+          echo "Unformatted files are detected. "
+          echo "You may apply provided patch. Download from the workflow summary and unpack to root of repository."
+          echo "Then run: git apply $CLANG_FORMAT_FILE"
+          exit 1
+        fi
+      shell: bash

scripts/misc/clang_format_ci.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+#
+# Copyright (C) 2025 HERE Europe B.V.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+# License-Filename: LICENSE
+#
+
+# Important 2 lines
+set +e
+set -x
+
+# This script gets the changed files in the pull request, and runs
+# clang-format tool to verify them
+
+# Get the current branch name
+CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+
+if [[ $CURRENT_BRANCH == "master" ]]; then
+  printf "Currently in master branch, skipping clang-format run.\n"
+  exit 0
+else
+  printf "Currently in %s branch. Running clang-foramt.\n" "$CURRENT_BRANCH"
+fi
+
+git branch --all
+git fetch origin master
+git branch --all
+# Get affected files and filter source files
+FILES=$(git diff-tree --no-commit-id --name-only -r origin/master "$CURRENT_BRANCH" \
+        | grep '\.c\|\.cpp\|\.cxx\|\.h\|\.hpp\|\.hxx')
+
+if [ -z "$FILES" ]; then
+  printf "No affected files, exiting.\n"
+  exit 0
+else
+  printf "Affected files:\n %s\n" "$FILES"
+fi
+
+printf "\n\n### Running clang-format - START ### \n\n"
+
+clang-format-6.0 -i ${FILES}
+RESULT=$?
+
+printf "\n\n### Running clang-format - DONE ### \n\n"
+
+if [ "$RESULT" -ne "0" ]; then
+  printf "\n\nClang-format failed!\n\n"
+  exit ${RESULT}
+fi
+
+CLANG_FORMAT_FILE=${CLANG_FORMAT_FILE:-clang-format.diff}
+git diff > ${CLANG_FORMAT_FILE}
+if [ -s ${CLANG_FORMAT_FILE} ] ; then
+  echo "Unformatted files are detected. "
+  echo "You may apply provided patch. Download from the workflow summary and unpack to root of repository."
+  echo "Then run: git apply $CLANG_FORMAT_FILE"
+  # No error here, otherwise github is skipping further steps so artifacts are not stored
+fi