Migrate linter from pylint to ruff (#1665)

format.sh

@@ -7,7 +7,7 @@
 #    # Format files that differ from origin/main.
 #    bash format.sh
 
-#    # Commit changed files with message 'Run yapf and pylint'
+#    # Commit changed files with message 'Run yapf and ruff'
 #
 #
 # YAPF + Clang formatter (if installed). This script formats all changed files from the last mergebase.
@@ -22,7 +22,7 @@ ROOT="$(git rev-parse --show-toplevel)"
 builtin cd "$ROOT" || exit 1
 
 YAPF_VERSION=$(yapf --version | awk '{print $2}')
-PYLINT_VERSION=$(pylint --version | head -n 1 | awk '{print $2}')
+RUFF_VERSION=$(ruff --version | awk '{print $2}')
 MYPY_VERSION=$(mypy --version | awk '{print $2}')
 
 # # params: tool name, tool version, required version
@@ -34,7 +34,7 @@ tool_version_check() {
 }
 
 tool_version_check "yapf" $YAPF_VERSION "$(grep yapf requirements-dev.txt | cut -d'=' -f3)"
-tool_version_check "pylint" $PYLINT_VERSION "$(grep "pylint==" requirements-dev.txt | cut -d'=' -f3)"
+tool_version_check "ruff" $RUFF_VERSION "$(grep "ruff==" requirements-dev.txt | cut -d'=' -f3)"
 tool_version_check "mypy" "$MYPY_VERSION" "$(grep mypy requirements-dev.txt | cut -d'=' -f3)"
 
 YAPF_FLAGS=(
@@ -95,14 +95,14 @@ echo 'vLLM yapf: Done'
 
 # Lint specified files
 lint() {
-    pylint "$@"
+    ruff "$@"
 }
 
 # Lint files that differ from main branch. Ignores dirs that are not slated
 # for autolint yet.
 lint_changed() {
     # The `if` guard ensures that the list of filenames is not empty, which
-    # could cause pylint to receive 0 positional arguments, making it hang
+    # could cause ruff to receive 0 positional arguments, making it hang
     # waiting for STDIN.
     #
     # `diff-filter=ACM` and $MERGEBASE is to ensure we only lint files that
@@ -111,13 +111,13 @@ lint_changed() {
 
     if ! git diff --diff-filter=ACM --quiet --exit-code "$MERGEBASE" -- '*.py' '*.pyi' &>/dev/null; then
         git diff --name-only --diff-filter=ACM "$MERGEBASE" -- '*.py' '*.pyi' | xargs \
-             pylint
+             ruff
     fi
 
 }
 
-# Run Pylint
-echo 'vLLM Pylint:'
+# Run Ruff
+echo 'vLLM Ruff:'
 ## This flag lints individual files. --files *must* be the first command line
 ## arg to use this option.
 if [[ "$1" == '--files' ]]; then