#21343 native options parser mismatch with quoted strings in env vars. Issue created by jcrobak Describe the bug We're using an env var to pass along a value to the ruff CLI. With pants 2.22.0.rc2, I'm seeing a mismatch like:

[WARN] Value mismatch for the option `args` in scope [ruff]:
Legacy value: ['--quiet', '--config', 'lint.isort.known-first-party=["foo","bar"]'] of type <class 'list'>, from source CONFIG
Native value: ['--quiet', '--config', 'lint.isort.known-first-party=[\\"foo\\",\\"bar\\"]'] of type <class 'list'>, from source CONFIG

Here's a minimal repro: cat << EOF > pants.toml [GLOBAL] pants_version="2.22.0.rc2" backend_packages = [ "pants.backend.python", "pants.backend.experimental.python.lint.ruff.check", ] [python] interpreter_constraints = ["CPython==3.12.*"] [ruff] args = ["--quiet", "--config", """lint.isort.known-first-party=%(env.FIRST_PARTY)s"""] EOF cat << EOF > .pants.bootstrap # there should be 3 slashes before each quote, so we need to do extra escaping for the heredoc FIRST_PARTY='[\\\\\"foo\\\\\",\\\\\"bar\\\\\"]' export FIRST_PARTY EOF cat << EOF > main.py print("hello world") EOF cat << EOF > BUILD python_sources() EOF # run pants lint - shows the Value mismatch warning pants lint :: Note, this is traced back to some unintuitive behavior in shlex, ref:

$ python
Python 3.12.5 (main, Aug  6 2024, 19:08:49) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import shlex
>>> shlex.split("""lint.isort.known-first-party=[\'foo\',\'bar\']""")
['lint.isort.known-first-party=[foo,bar]']
>>> shlex.split("""lint.isort.known-first-party=[\\\'foo\\\',\\\'bar\\\']""")
["lint.isort.known-first-party=['foo','bar']"]

... and I believe the new behavior is more ergonomic. Pants version 2.22.0.rc2 OS MacOS Additional info n/a pantsbuild/pants