Add black formatting check

docker/test/style/Dockerfile

@@ -16,7 +16,7 @@ RUN apt-get update && env DEBIAN_FRONTEND=noninteractive apt-get install --yes \
     python3-pip \
     shellcheck \
     yamllint \
-    && pip3 install codespell PyGithub boto3 unidiff dohq-artifactory
+    && pip3 install black boto3 codespell dohq-artifactory PyGithub unidiff
 
 # Architecture of the image when BuildKit/buildx is used
 ARG TARGETARCH

docker/test/style/process_style_check_result.py

@@ -14,6 +14,7 @@ def process_result(result_folder):
         ("header duplicates", "duplicate_output.txt"),
         ("shellcheck", "shellcheck_output.txt"),
         ("style", "style_output.txt"),
+        ("black", "black_output.txt"),
         ("typos", "typos_output.txt"),
         ("whitespaces", "whitespaces_output.txt"),
         ("workflows", "workflows_output.txt"),

docker/test/style/run.sh

@@ -7,6 +7,8 @@ echo "Check duplicates" | ts
 ./check-duplicate-includes.sh |& tee /test_output/duplicate_output.txt
 echo "Check style" | ts
 ./check-style -n              |& tee /test_output/style_output.txt
+echo "Check python formatting with black" | ts
+./check-black -n              |& tee /test_output/black_output.txt
 echo "Check typos" | ts
 ./check-typos                 |& tee /test_output/typos_output.txt
 echo "Check whitespaces" | ts

utils/check-style/check-black

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+
+# We check only our code, that's why we skip contrib
+GIT_ROOT=$(git rev-parse --show-cdup)
+GIT_ROOT=${GIT_ROOT:-.}
+tmp=$(mktemp)
+if ! find "$GIT_ROOT" -name '*.py' -not -path "$GIT_ROOT/contrib/*" -exec black --check {} + 1>"$tmp" 2>&1; then
+  # Show the result only if some files need formatting
+  cat "$tmp"
+fi
+rm "$tmp"