DAOS-16865 cq: update flake8 to 7.1.1 (#15575)

Update flake8 to 7.1.1.
Adjust githook to work with newer flake8.
Also tested to be backwards compatible with flake8<6

Signed-off-by: Dalton Bohning <[email protected]>

utils/cq/requirements.txt

@@ -2,7 +2,7 @@
 pyenchant
 ## flake8 6 removed --diff option which breaks flake precommit hook.
 ## https://github.com/pycqa/flake8/issues/1389 https://github.com/PyCQA/flake8/pull/1720
-flake8<6.0.0
+flake8==7.1.1
 isort==5.13.2
 pylint==3.3.2
 yamllint==1.35.1

utils/githooks/pre-commit.d/71-flake.sh

@@ -20,19 +20,17 @@
 set -ue
 
 _print_githook_header "Flake8"
-if ! command -v flake8 > /dev/null 2>&1; then
-    echo "flake8 not installed. Install flake8 command to improve pre-commit checks:"
-    echo "  python3 -m pip install -r ./utils/cq/requirements.txt"
-    exit 0
-fi
 
-if flake8 --version | grep ^6\\.; then
-    echo "flake8 >= 6.x does not have the --diff option. Skipping."
+py_files=$(_git_diff_cached_files "*.py SConstruct */SConscript")
+
+if [ -z "$py_files" ]; then
+    echo "No python changes. Skipping"
     exit 0
 fi
 
-if [ ! -f .flake8 ]; then
-    echo "No .flake8 config. Skipping"
+if ! command -v flake8 > /dev/null 2>&1; then
+    echo "flake8 not installed. Install flake8 command to improve pre-commit checks:"
+    echo "  python3 -m pip install -r ./utils/cq/requirements.txt"
     exit 0
 fi
 
@@ -47,12 +45,17 @@ if [ "$BRANCH" = "origin/master" ]; then
     echo "  Checking tree"
     flake8 --statistics
 else
-
-    # shellcheck disable=SC1091
+    rc=0
 
     # non-scons
-    git diff "$TARGET" -U10 | flake8 --config .flake8 --diff
+    if ! echo "$py_files" | grep -vi scons | xargs flake8 --config .flake8; then
+        rc=1
+    fi
 
     # scons
-    git diff "$TARGET" -U10 | flake8 --config .flake8-scons --diff
+    if ! echo "$py_files" | grep -i scons | xargs flake8 --config .flake8-scons; then
+        rc=1;
+    fi
+
+    exit "$rc"
 fi