[Buildroot] [PATCH v2 6/7] .gitlab-ci.yml: check flake8

[Ricardo Martincoski]

Add a test to check Python code style in the whole buildroot tree.

Search files by type in order to help flake8 to find the Python scripts
without .py extension. But don't rely only in the output of 'file' as it
uses heuristics and sometimes it is wrong (specially identifying Python
files as C++ source for the 'file' version currently in the Docker
image).

Include in the output:
 - the list of Python files processed;
 - statistics for each kind of warning;
 - the total number of warnings;
 - the number of Python files processed.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski at gmail.com>
Cc: Arnout Vandecappelle <arnout at mind.be>
Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
---
Changes v1 -> v2:  (suggested by Yann E. MORIN)
  - install flake8 to the base docker image (in the previous patch)

https://gitlab.com/RicardoMartincoski/buildroot/-/jobs/56769344
---
 .gitlab-ci.yml    | 11 +++++++++++
 .gitlab-ci.yml.in | 11 +++++++++++
 2 files changed, 22 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4cdaa09..efd2587 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,6 +30,17 @@ check-DEVELOPERS:
     script:
         - "! utils/get-developers | grep -v 'No action specified'"
 
+check-flake8:
+    before_script:
+        # Help flake8 to find the Python files without .py extension.
+        - find * -type f -name '*.py' > files.txt
+        - find * -type f -print0 | xargs -0 file | grep 'Python script' | cut -d':' -f1 >> files.txt
+        - sort -u files.txt | tee files.processed
+    script:
+        - python -m flake8 --statistics --count $(cat files.processed)
+    after_script:
+        - wc -l files.processed
+
 check-package:
     script:
         - find . -type f \( -name '*.mk' -o -name '*.hash' \) -exec ./utils/check-package {} +
diff --git a/.gitlab-ci.yml.in b/.gitlab-ci.yml.in
index cb3eb71..95fc025 100644
--- a/.gitlab-ci.yml.in
+++ b/.gitlab-ci.yml.in
@@ -30,6 +30,17 @@ check-DEVELOPERS:
     script:
         - "! utils/get-developers | grep -v 'No action specified'"
 
+check-flake8:
+    before_script:
+        # Help flake8 to find the Python files without .py extension.
+        - find * -type f -name '*.py' > files.txt
+        - find * -type f -print0 | xargs -0 file | grep 'Python script' | cut -d':' -f1 >> files.txt
+        - sort -u files.txt | tee files.processed
+    script:
+        - python -m flake8 --statistics --count $(cat files.processed)
+    after_script:
+        - wc -l files.processed
+
 check-package:
     script:
         - find . -type f \( -name '*.mk' -o -name '*.hash' \) -exec ./utils/check-package {} +
-- 
2.7.4