Failed to load hook pylsp_lint: [Errno 2] No such file or directory: ''

[Ultimator14]

When opening a standalone file (that does not have a project root), pylint crashes and no diagnostics are displayed.

Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/pylsp/config/config.py", line 33, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pluggy/_manager.py", line 327, in traced_hookexec
    return outcome.get_result()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/usr/lib/python3.11/site-packages/pluggy/_result.py", line 33, in from_call
    result = func()
             ^^^^^^
  File "/usr/lib/python3.11/site-packages/pluggy/_manager.py", line 324, in <lambda>
    lambda: oldcall(hook_name, hook_impls, kwargs, firstresult)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pluggy/_callers.py", line 60, in _multicall
    return outcome.get_result()
           ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/usr/lib/python3.11/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylsp/plugins/pylint_lint.py", line 220, in pylsp_lint
    return PylintLinter.lint(document, is_saved, flags=flags)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/site-packages/pylsp/plugins/pylint_lint.py", line 98, in lint
    with Popen(cmd, stdout=PIPE, stderr=PIPE,
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/subprocess.py", line 1024, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.11/subprocess.py", line 1917, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: ''

The failing code is

with Popen(cmd, stdout=PIPE, stderr=PIPE,
                   cwd=document._workspace.root_path, universal_newlines=True) as process:

with document._workspace.root_path being an empty string. The problem is that the Popen cwd argument is always set, regardless of the root_path. To make this work, the value should be set to the directory of the file if no root path exists.
This works for me

if not (cwd := document._workspace.root_path):
    cwd = os.path.dirname(__file__)

with Popen(cmd, stdout=PIPE, stderr=PIPE,
                   cwd=cwd, universal_newlines=True) as process:

Pylsp version: 1.7.2
Editor: Neovim: 0.8.3

[mxkrsv]

Same here, neovim log:

[ERROR][2023-04-23 14:41:10] .../vim/lsp/rpc.lua:734	"rpc"	"pylsp"	"stderr"	"2023-04-23 14:41:10,325 MSK - WARNING - pylsp.config.config - Failed to load hook pylsp_lint: [Errno 2] No such file or directory: ''\nTraceback (most recent call last):\n  File \"/nix/store/mdmff1mbn88k2nqkjnwk64fzn6ij2672-python3.10-python-lsp-server-1.7.2/lib/python3.10/site-packages/pylsp/config/config.py\", line 33, in _hookexec\n    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_manager.py\", line 327, in traced_hookexec\n    return outcome.get_result()\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_result.py\", line 60, in get_result\n    raise ex[1].with_traceback(ex[2])\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_result.py\", line 33, in from_call\n    result = func()\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_manager.py\", line 324, in <lambda>\n    lambda: oldcall(hook_name, hook_impls, kwargs, firstresult)\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_callers.py\", line 60, in _multicall\n    return outcome.get_result()\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_result.py\", line 60, in get_result\n    raise ex[1].with_traceback(ex[2])\n  File \"/nix/store/73qfz3nks3pv4msd5vz23hcl7k1v96vw-python3.10-pluggy-1.0.0/lib/python3.10/site-packages/pluggy/_callers.py\", line 39, in _multicall\n    res = hook_impl.function(*args)\n  File \"/nix/store/mdmff1mbn88k2nqkjnwk64fzn6ij2672-python3.10-python-lsp-server-1.7.2/lib/python3.10/site-packages/pylsp/plugins/pylint_lint.py\", line 220, in pylsp_lint\n    return PylintLinter.lint(document, is_saved, flags=flags)\n  File \"/nix/store/mdmff1mbn88k2nqkjnwk64fzn6ij2672-python3.10-python-lsp-server-1.7.2/lib/python3.10/site-packages/pylsp/plugins/pylint_lint.py\", line 98, in lint\n    with Popen(cmd, stdout=PIPE, stderr=PIPE,\n  File \"/nix/store/fdqpyj613dr0v1l1lrzqhzay7sk4xg87-python3-3.10.10/lib/python3.10/subprocess.py\", line 971, in __init__\n    self._execute_child(args, executable, preexec_fn, close_fds,\n  File \"/nix/store/fdqpyj613dr0v1l1lrzqhzay7sk4xg87-python3-3.10.10/lib/python3.10/subprocess.py\", line 1847, in _execute_child\n    raise child_exception_type(errno_num, err_msg, err_filename)\nFileNotFoundError: [Errno 2] No such file or directory: ''\n"

[ccordoba12]

Hey @Ultimator14, thanks for reporting this problem and finding a solution for it! Would you like to submit a pull request with your fix?