add astyle lint CI job

ensure git is installed

fix git update-index call and exit with error

wip: upatw

.gitlab-ci.yml

@@ -328,6 +328,18 @@ lint:markdown:
   script:
     - find . -name "*.md" -exec markdownlint {} \;
 
+lint:astyle:
+  stage: lint
+  image: igwn/base:el8
+  needs: []
+  before_script:
+    - dnf -y install astyle git
+  script:
+    # format source code
+    - astyle --project --recursive "*.c" "*.h"
+    # did astyle make any changes?
+    - if ! git diff-index --quiet --exit-code HEAD; then echo "Formatting issues found, please format code correctly"; exit 1; fi
+
 # -- documentation ------------------------------
 
 documentation: