Replace Pylint with Ruff for Python linting

- Remove Pylint installation, configuration, and invocation from the Makefile.
- Remove the GPL-licensed tarball:
  gpMgmt/bin/pythonSrc/ext/pylint-0.21.0.tar.gz
- Remove the old Pylint configuration file (.rcfile) since it is no longer
  relevant.
- Introduce Ruff installation via the official installation script.
- Dynamically install Ruff instead of storing tarballs or source files.
- Update checkcode target to run Ruff instead of Pylint.
- Clean up references to Pylint tarballs in the clean/distclean target.
- Add new pyproject.toml file to configure Ruff:

  [tool.ruff]
  line-length = 88

  [tool.ruff.lint]
  select = ["E", "F", "W"]

Note: Ruff installation requires internet access during the first run.

Note: The removal of the Pylint .rcfile requires eventual replacement with
      corresponding Ruff configuration enhancements if more complex rules
      are needed in the future.

This change only introduces Ruff into the workflow. It does not attempt
to fix or address any issues that Ruff may report.

Author: edespino

gpMgmt/bin/.rcfile

@@ -119,12 +119,8 @@ pyyaml:
 	cp -r $(PYLIB_SRC_EXT)/$(PYYAML_DIR)/build/lib*-3*/* $(PYLIB_DIR)/
 
 #
-# PYLINT
+# MOCK SETUP
 #
-
-PYLINT_VERSION=0.21.0
-PYLINT_DIR=pylint-$(PYLINT_VERSION)
-PYLINT_PYTHONPATH=$(PYLIB_DIR):$(PYLIB_SRC_EXT)/$(PYLINT_DIR)/build/lib/
 MOCK_VERSION=1.0.1
 MOCK_DIR=mock-$(MOCK_VERSION)
 SETUP_TOOLS_VERSION=36.6.0
@@ -139,12 +135,6 @@ PYTHONSRC_INSTALL_PYTHON_PATH=$(PYTHONPATH):$(PYTHONSRC_INSTALL_SITE)
 MOCK_BIN=$(PYTHONSRC_INSTALL)/lib/python$(PYTHON_VERSION)/site-packages/mock-1.0.1-py2.6.egg
 UBUNTU_PLATFORM=$(shell if lsb_release -a 2>/dev/null | grep -q 'Ubuntu' ; then echo "Ubuntu"; fi)
 
-pylint:
-	@echo "--- pylint"
-	@cd $(PYLIB_SRC_EXT)/ && $(TAR) xzf $(PYLINT_DIR).tar.gz
-	@cd $(PYLIB_SRC_EXT)/$(PYLINT_DIR)/ && python3 setup.py build 1> /dev/null
-	@touch $(PYLIB_SRC_EXT)/$(PYLINT_DIR)/build/lib/__init__.py
-
 $(MOCK_BIN):
 	@echo "--- mock for platform $(UBUNTU_PLATFORM)"
 	@if [ "$(UBUNTU_PLATFORM)" = "Ubuntu" ]; then\
@@ -156,16 +146,43 @@ $(MOCK_BIN):
 	   PYTHONPATH=$(PYTHONSRC_INSTALL_PYTHON_PATH) python3 setup.py install --prefix $(PYTHONSRC_INSTALL) ; \
 	 fi;
 
-PYTHON_FILES=`grep -l --exclude=Makefile --exclude=gplogfilter "/bin/env python3" *`\
-			 `grep -l "/bin/env python3" $(SRC)/../sbin/*`\
-			 `find ./gppylib -name "*.py"`\
-			 `find $(SRC)/../sbin -name "*.py"`
-
-checkcode: pylint
-	@echo "Running pylint on management scripts..."
-	@PYTHONPATH=$(PYTHONPATH):$(PYLINT_PYTHONPATH) $(PYLIB_SRC_EXT)/$(PYLINT_DIR)/bin/pylint -i y $(PYTHON_FILES) --rcfile=.rcfile > $(SRC)/../pylint.txt || true
-	@echo -n "pylint_score=" > $(SRC)/../pylint_score.properties
-	@grep "Your code has been rated at" $(SRC)/../pylint.txt | sed -e "s|Your .* \(.*\)/.*|\1|" >> $(SRC)/../pylint_score.properties
+# -----------------------------------------------------------------------------
+#
+# Ruff installation
+#
+# We dynamically retrieve the latest Ruff binary using the official install script.
+# No tarballs or source files for Ruff are stored in this repository.
+# This simplifies maintenance and ensures the linter is up-to-date.
+#
+# Note: Internet access is required for the initial installation.
+# -----------------------------------------------------------------------------
+RUFF_INSTALL_DIR ?= $(HOME)/.local/bin
+RUFF_BIN=$(RUFF_INSTALL_DIR)/ruff
+
+ruff:
+	@if [ ! -x "$(RUFF_BIN)" ]; then \
+		echo "--- Installing ruff linter"; \
+		mkdir -p $(RUFF_INSTALL_DIR); \
+		curl -LsSf https://astral.sh/ruff/install.sh | BIN_DIR=$(RUFF_INSTALL_DIR) sh; \
+		echo "--- ruff installed at $(RUFF_BIN)"; \
+	else \
+		echo "--- ruff already installed at $(RUFF_BIN)"; \
+	fi
+	@$(RUFF_BIN) --version
+
+PYTHON_FILES=`grep -l --exclude=Makefile \
+		      --exclude=ruff.txt \
+		      --exclude=gplogfilter \
+		      "/bin/env python3" *`\
+	      `grep -l "/bin/env python3" \
+		       $(SRC)/../sbin/*`\
+	      `find ./gppylib -name "*.py"`\
+	      `find $(SRC)/../sbin -name "*.py"`
+
+checkcode: ruff
+	@echo "Running ruff on management scripts..."
+	@RUST_LOG=error $(RUFF_BIN) check -v $(PYTHON_FILES) > $(SRC)/ruff.txt || true
+	@echo "Ruff lint completed. Results saved to $(SRC)/ruff.txt"
 
 check: $(MOCK_BIN)
 	@echo "Running pure unit and also "unit" tests that require cluster to be up..."
@@ -189,7 +206,7 @@ installcheck: installcheck-bash
 	$(MAKE) -C gpload_test $@
 
 clean distclean:
-	rm -rf $(PYLIB_SRC_EXT)/$(PYLINT_DIR)
+	rm -rf $(RUFF_BIN) $(SRC)/ruff.txt $(SRC)/.ruff_cache
 	rm -rf $(PYLIB_SRC_EXT)/$(PYGRESQL_DIR)/build
 	rm -rf $(PYLIB_SRC)/$(PYGRESQL_DIR)/build
 	rm -rf *.pyc

gpMgmt/bin/Makefile

@@ -0,0 +1,5 @@
+[tool.ruff]
+line-length = 88
+
+[tool.ruff.lint]
+select = ["E", "F", "W"]