Running M-x dape gives file-local-name: Wrong type argument: stringp, nil

[ZelphirKaltstahl]

Either I don't get how to actually start a debugging session, or something is wrong. Whenever I run M-x dape in a Python file (that has a breakbpoint) it asks me:

Run adapter: debugpy comment "/home/user/dev/python/triplets/venv/bin/python"

I confirm that.
Then I get an error:

file-local-name: Wrong type argument: stringp, nil

Emacs is:

GNU Emacs 29.4 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0)

My init.el config is:

(use-package dape
  :hook
  ;; Save breakpoints on quit
  (kill-emacs . dape-breakpoint-save)
  ;; Load breakpoints on startup
  (after-init . dape-breakpoint-load)
  ;; Info buffers to the right
  (setq dape-buffer-window-arrangement 'right)
  )

;; Enable repeat mode for more ergonomic `dape' use
(use-package repeat
  :config
  (repeat-mode))

My dape.el version is: 0.16.0.

My Python venv has:

Package               Version
--------------------- -------
debugpy               1.8.11
docstring-to-markdown 0.15
jedi                  0.19.2
parso                 0.8.4
pip                   22.0.2
pluggy                1.5.0
python-lsp-jsonrpc    1.1.2
python-lsp-server     1.12.0
setuptools            59.6.0
ujson                 5.10.0

So I got debugpy and a language server (https://github.com/python-lsp/python-lsp-server).

file-local-name: Wrong type argument: stringp, nil

So file-local-name is not a string? Do I interpret the error correctly? And what presumes it to be existing and why is it not a string? I am not sure what causes the issue.

[svaante]

Hey!
I am note sure if it's a typo in the issue but if you are specifying another python then the one under path it should be command not comment in.

Run adapter: debugpy comment "/home/user/dev/python/triplets/venv/bin/python"

If that is a typo I would need the backtrace.

M-x toggle-debug-on-error then share the contents of *Backtrace*.

[ZelphirKaltstahl]

If that is a typo I would need the backtrace.

Ah, sorry for that, it is indeed a typo. The actual text there is:

Run adapter: debugpy command "/home/user/dev/python/triplets/venv/bin/python"

And here is the backtrace:

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  file-remote-p(nil localname)
  file-local-name(nil)
  tramp-file-local-name(nil)
  dape-cwd()
  funcall-interactively(dape-cwd)
  dape--config-eval-value(dape-cwd nil t nil)
  dape--config-eval-1((modes (python-mode python-ts-mode) ensure (lambda (config) (dape-ensure-command config) (let ((python (dape-config-get config 'command))) (unless (zerop (call-process-shell-command (format "%s -c \"import debugpy.adapter\"" python))) (user-error "%s module debugpy is not installed" python)))) command "/home/user/dev/python/triplets/venv/bin/python" command-args ("-m" "debugpy.adapter" "--host" "0.0.0.0" "--port" :autoport) port :autoport :request "launch" :type "python" :cwd dape-cwd :program dape-buffer-default :args [] :justMyCode nil :console "integratedTerminal" :showReturnValue t :stopOnEntry nil))
  dape--config-eval(debugpy (modes (python-mode python-ts-mode) ensure (lambda (config) (dape-ensure-command config) (let ((python (dape-config-get config 'command))) (unless (zerop (call-process-shell-command (format "%s -c \"import debugpy.adapter\"" python))) (user-error "%s module debugpy is not installed" python)))) command "/home/user/dev/python/triplets/venv/bin/python" command-args ("-m" "debugpy.adapter" "--host" "0.0.0.0" "--port" :autoport) port :autoport :request "launch" :type "python" :cwd dape-cwd :program dape-buffer-default :args [] :justMyCode nil :console "integratedTerminal" :showReturnValue t :stopOnEntry nil))
  dape--read-config()
  byte-code("\300 C\207" [dape--read-config] 1)
  command-execute(dape record)
  execute-extended-command(nil "dape" nil)
  funcall-interactively(execute-extended-command nil "dape" nil)
  command-execute(execute-extended-command)

[svaante]

Strange it looks like dape-cwd-fn is returning nil.

I don't think it will fix your issue but you seam to have an older
version of dape then what is available on elpa.

What happens if you specify :cwd

Run adapter: debugpy command "/home/user/dev/python/triplets/venv/bin/python" :cwd "/abs/path/to/current-directory/"

[ZelphirKaltstahl]

Yes! That did it! If I specify the :cwd it works! No error and I get to see all those buffers and it stops at the breakpoint.

Thank you!

Do you think this issue should be closed, or left open to investigate the dape-cwd-fn thing?