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"""Class to support running various linters in a common framework."""
from __future__ import absolute_import
from __future__ import print_function
import difflib
import logging
import os
import re
import subprocess
import sys
import threading
from typing import Dict, List, Optional
from . import base
def _check_version(linter, cmd_path, args):
# type: (base.LinterBase, List[str], List[str]) -> bool
"""Check if the given linter has the correct version."""
try:
cmd = cmd_path + args
logging.info(str(cmd))
process_handle = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
output, stderr = process_handle.communicate()
if process_handle.returncode:
logging.info("Version check failed for [%s], return code '%d'." +
"Standard Output:\n%s\nStandard Error:\n%s", cmd,
process_handle.returncode, output, stderr)
required_version = re.escape(linter.required_version)
pattern = r"\b%s\b" % (required_version)
if not re.search(pattern, output):
logging.info("Linter %s has wrong version for '%s'. Expected '%s'," +
"Standard Output:\n'%s'\nStandard Error:\n%s", linter.cmd_name, cmd,
required_version, output, stderr)
return False
except OSError as os_error:
# The WindowsError exception is thrown if the command is not found.
# We catch OSError since WindowsError does not exist on non-Windows platforms.
logging.info("Version check command [%s] failed: %s", cmd, os_error)
return False
return True
def _find_linter(linter, config_dict):
# type: (base.LinterBase, Dict[str,str]) -> Optional[base.LinterInstance]
"""
Look for a linter command with the required version.
Return a LinterInstance with the location of the linter binary if a linter binary with the
matching version is found. None otherwise.
"""
if linter.cmd_name in config_dict and config_dict[linter.cmd_name] is not None:
cmd = [config_dict[linter.cmd_name]]
# If the user specified a tool location, we do not search any further
if _check_version(linter, cmd, linter.get_lint_version_cmd_args()):
return base.LinterInstance(linter, cmd)
return None
# Search for tool
# 1. In the same directory as the interpreter
# 2. The current path
# 3. In '/opt/mongodbtoolchain/v2/bin' if virtualenv is set up.
python_dir = os.path.dirname(sys.executable)
if sys.platform == "win32":
# On Windows, these scripts are installed in %PYTHONDIR%\scripts like
# 'C:\Python27\scripts', and have .exe extensions.
python_dir = os.path.join(python_dir, "scripts")
cmd_str = os.path.join(python_dir, linter.cmd_name)
cmd_str += ".exe"
cmd = [cmd_str]
else:
# On Mac and with Homebrew, check for the binaries in /usr/local instead of sys.executable.
if sys.platform == 'darwin' and python_dir.startswith('/usr/local/opt'):
python_dir = '/usr/local/bin'
# On Linux, these scripts are installed in %PYTHONDIR%\bin like
# '/opt/mongodbtoolchain/v2/bin', but they may point to the wrong interpreter.
cmd_str = os.path.join(python_dir, linter.cmd_name)
if linter.ignore_interpreter():
# Some linters use a different interpreter then the current interpreter.
# If the linter cmd_location is specified then use that location.
if linter.cmd_location:
cmd_str = linter.cmd_location
else:
cmd_str = os.path.join('/opt/mongodbtoolchain/v2/bin', linter.cmd_name)
cmd = [cmd_str]
else:
cmd = [sys.executable, cmd_str]
# Check 1: interpreter location or for linters that ignore current interpreter.
if _check_version(linter, cmd, linter.get_lint_version_cmd_args()):
return base.LinterInstance(linter, cmd)
logging.info("First version check failed for linter '%s', trying a different location.",
linter.cmd_name)
# Check 2: current path
cmd = [linter.cmd_name]
if _check_version(linter, cmd, linter.get_lint_version_cmd_args()):
return base.LinterInstance(linter, cmd)
# Check 3: When a virtualenv is setup the linter modules are not installed, so we need
# to use the linters installed in '/opt/mongodbtoolchain/v2/bin'.
cmd = [sys.executable, os.path.join('/opt/mongodbtoolchain/v2/bin', linter.cmd_name)]
if _check_version(linter, cmd, linter.get_lint_version_cmd_args()):
return base.LinterInstance(linter, cmd)
return None
def find_linters(linter_list, config_dict):
# type: (List[base.LinterBase], Dict[str,str]) -> List[base.LinterInstance]
"""Find the location of all linters."""
linter_instances = [] # type: List[base.LinterInstance]
for linter in linter_list:
linter_instance = _find_linter(linter, config_dict)
if not linter_instance:
logging.error("""\
Could not find the correct version of linter '%s', expected '%s'. Check your
PATH environment variable or re-run with --verbose for more information.
To fix, install the needed python modules for both Python 2.7, and Python 3.x:
sudo pip2 install -r etc/pip/lint-requirements.txt
sudo pip3 install -r etc/pip/lint-requirements.txt
These commands are typically available via packages with names like python-pip,
python2-pip, and python3-pip. See your OS documentation for help.
""", linter.cmd_name, linter.required_version)
return None
linter_instances.append(linter_instance)
return linter_instances
class LintRunner(object):
"""Run a linter and print results in a thread safe manner."""
def __init__(self):
# type: () -> None
"""Create a Lint Runner."""
self.print_lock = threading.Lock()
def _safe_print(self, line):
# type: (str) -> None
"""
Print a line of text under a lock.
Take a lock to ensure diffs do not get mixed when printed to the screen.
"""
with self.print_lock:
print(line)
def run_lint(self, linter, file_name):
# type: (base.LinterInstance, str) -> bool
"""Run the specified linter for the file."""
cmd = linter.cmd_path + linter.linter.get_lint_cmd_args(file_name)
logging.debug(str(cmd))
try:
if linter.linter.needs_file_diff():
# Need a file diff
with open(file_name, 'rb') as original_text:
original_file = original_text.read()
formatted_file = subprocess.check_output(cmd)
if original_file != formatted_file:
original_lines = original_file.splitlines()
formatted_lines = formatted_file.splitlines()
result = difflib.unified_diff(original_lines, formatted_lines)
# Take a lock to ensure diffs do not get mixed when printed to the screen
with self.print_lock:
print("ERROR: Found diff for " + file_name)
print("To fix formatting errors, run pylinters.py fix %s" % (file_name))
count = 0
for line in result:
print(line.rstrip())
count += 1
if count == 0:
print("ERROR: The files only differ in trailing whitespace? LF vs CRLF")
return False
else:
output = subprocess.check_output(cmd)
# On Windows, mypy.bat returns 0 even if there are length failures so we need to
# check if there was any output
if output and sys.platform == "win32":
self._safe_print("CMD [%s] output:\n%s" % (cmd, output))
return False
except subprocess.CalledProcessError as cpe:
self._safe_print("CMD [%s] failed:\n%s" % (cmd, cpe.output))
return False
return True
def run(self, cmd):
# type: (List[str]) -> bool
"""Check the specified cmd succeeds."""
logging.debug(str(cmd))
try:
subprocess.check_output(cmd)
except subprocess.CalledProcessError as cpe:
self._safe_print("CMD [%s] failed:\n%s" % (cmd, cpe.output))
return False
return True
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