1 files changed, 137 insertions, 0 deletions
diff --git a/tools/lint/python/pylint.py b/tools/lint/python/pylint.py
new file mode 100644
index 0000000000..ba95be1f0b
--- /dev/null
+++ b/tools/lint/python/pylint.py
@@ -0,0 +1,137 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import os
+import subprocess
+
+import signal
+
+from mozprocess import ProcessHandler
+
+from mozlint import result
+from mozlint.pathutils import expand_exclusions
+
+here = os.path.abspath(os.path.dirname(__file__))
+PYLINT_REQUIREMENTS_PATH = os.path.join(here, "pylint_requirements.txt")
+
+PYLINT_NOT_FOUND = """
+Could not find pylint! Install pylint and try again.
+
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    PYLINT_REQUIREMENTS_PATH
+)
+
+
+PYLINT_INSTALL_ERROR = """
+Unable to install correct version of pylint
+Try to install it manually with:
+    $ pip install -U --require-hashes -r {}
+""".strip().format(
+    PYLINT_REQUIREMENTS_PATH
+)
+
+
+class PylintProcess(ProcessHandler):
+    def __init__(self, config, *args, **kwargs):
+        self.config = config
+        kwargs["stream"] = False
+        kwargs["universal_newlines"] = True
+        ProcessHandler.__init__(self, *args, **kwargs)
+
+    def run(self, *args, **kwargs):
+        orig = signal.signal(signal.SIGINT, signal.SIG_IGN)
+        ProcessHandler.run(self, *args, **kwargs)
+        signal.signal(signal.SIGINT, orig)
+
+
+def setup(root, **lintargs):
+    virtualenv_manager = lintargs["virtualenv_manager"]
+    try:
+        virtualenv_manager.install_pip_requirements(
+            PYLINT_REQUIREMENTS_PATH,
+            quiet=True,
+            # The defined versions of astroid and lazy-object-proxy conflict and fail to
+            # install with the new 2020 pip resolver (bug 1682959)
+            legacy_resolver=True,
+        )
+    except subprocess.CalledProcessError:
+        print(PYLINT_INSTALL_ERROR)
+        return 1
+
+
+def get_pylint_binary():
+    return "pylint"
+
+
+def run_process(config, cmd):
+    proc = PylintProcess(config, cmd)
+    proc.run()
+    try:
+        proc.wait()
+    except KeyboardInterrupt:
+        proc.kill()
+
+    return proc.output
+
+
+def parse_issues(log, config, issues_json, path):
+    results = []
+
+    try:
+        issues = json.loads(issues_json)
+    except json.decoder.JSONDecodeError:
+        log.debug("Could not parse the output:")
+        log.debug("pylint output: {}".format(issues_json))
+        return []
+
+    for issue in issues:
+        res = {
+            "path": issue["path"],
+            "level": issue["type"],
+            "lineno": issue["line"],
+            "column": issue["column"],
+            "message": issue["message"],
+            "rule": issue["message-id"],
+        }
+        results.append(result.from_config(config, **res))
+    return results
+
+
+def get_pylint_version(binary):
+    return subprocess.check_output(
+        [binary, "--version"],
+        universal_newlines=True,
+        stderr=subprocess.STDOUT,
+    )
+
+
+def lint(paths, config, **lintargs):
+    log = lintargs["log"]
+
+    binary = get_pylint_binary()
+
+    log = lintargs["log"]
+    paths = list(expand_exclusions(paths, config, lintargs["root"]))
+
+    cmd_args = [binary]
+    results = []
+
+    # list from https://code.visualstudio.com/docs/python/linting#_pylint
+    # And ignore a bit more elements
+    cmd_args += [
+        "-fjson",
+        "--disable=all",
+        "--enable=F,E,unreachable,duplicate-key,unnecessary-semicolon,global-variable-not-assigned,unused-variable,binary-op-exception,bad-format-string,anomalous-backslash-in-string,bad-open-mode,no-else-return",  # NOQA: E501
+        "--disable=import-error,no-member",
+    ]
+
+    base_command = cmd_args + paths
+    log.debug("Command: {}".format(" ".join(cmd_args)))
+    log.debug("pylint version: {}".format(get_pylint_version(binary)))
+    output = " ".join(run_process(config, base_command))
+    results = parse_issues(log, config, str(output), [])
+
+    return results