GNU bug report logs - #77425
31.0.50; Switching to remote project -> no applicable method

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Switching to remote project -> no applicable method
Date: Tue, 01 Apr 2025 09:07:15 +0200

- emacs -Q -nw

- Eval in *scratch* (or C-x p p equivalent)
  (project-switch-project "/ssh:mini:~/emacs/github/master/")
  where "/ssh:mini:~/emacs/github/master/" is a Git repository on another machien

=>

Debugger entered--Lisp error: (cl-no-applicable-method project-root nil)
  signal(cl-no-applicable-method (project-root nil))
  cl-no-applicable-method(#s(cl--generic :name project-root :dispatches
  (((&context . project--within-roots-fallback)
  #s(cl--generic-generalizer :name cl--generic-eql-generalizer :priority
  100 :tagcode-function #f(compiled-function (name &rest _) #<bytecode
  0x1077d817f9409598>) :specializers-function #f(compiled-function (tag
  &rest _) #<bytecode 0xa38db246bcaffb>)) #s(cl--generic-generalizer
  :name cl--generic-t-generalizer :priority 0 :tagcode-function
  #f(compiled-function (name &rest _) #<bytecode -0xcaf03e2e0e0b800>)
  :specializers-function #f(compiled-function (tag &rest _) #<bytecode
  -0xcaf03e2e0e088e2>))) (0 #s(cl--g eneric-generalizer :name cl--generic-head-generalizer :priority 80 :tagcode-function #f(compiled-function (name &rest _) #<bytecode 0xbe4f64f8ef48720>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode -0x175c724d89d63e85>)) #s(cl--generic-generalizer :name cl--generic-t-generalizer :priority 0 :tagcode-function #f(compiled-function (name &rest _) #<bytecode -0xcaf03e2e0e0b800>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode -0xcaf03e2e0e088e2>)))) :method-table (#s(cl--generic-method :specializers ((head vc)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x4939e1b339236b2>)) #s(cl--generic-method :specializers ((head transient)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x49380d3d9f6b40e>)) #s(cl--generic-method :specializers (t ((&context . project--within-roots-fallback) eql nil)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x4f0874ce20019b2>))) :options nil) nil)
  apply(cl-no-applicable-method #s(cl--generic :name project-root :dispatches (((&context . project--within-roots-fallback) #s(cl--generic-generalizer :name cl--generic-eql-generalizer :priority 100 :tagcode-function #f(compiled-function (name &rest _) #<bytecode 0x1077d817f9409598>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode 0xa38db246bcaffb>)) #s(cl--generic-generalizer :name cl--generic-t-generalizer :priority 0 :tagcode-function #f(compiled-function (name &rest _) #<bytecode -0xcaf03e2e0e0b800>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode -0xcaf03e2e0e088e2>))) (0 #s(cl--generic-generalizer :name cl--generic-head-generalizer :priority 80 :tagcode-function #f(compiled-function (name &rest _) #<bytecode 0xbe4f64f8ef48720>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode -0x175c724d89d63e85>)) #s(cl--generic-generalizer :name cl--generic-t-generalizer :priority 0 :tagcode-function #f(compiled-function (name &rest _) #<bytecode -0xcaf03e2e0e0b800>) :specializers-function #f(compiled-function (tag &rest _) #<bytecode -0xcaf03e2e0e088e2>)))) :method-table (#s(cl--generic-method :specializers ((head vc)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x4939e1b339236b2>)) #s(cl--generic-method :specializers ((head transient)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x49380d3d9f6b40e>)) #s(cl--generic-method :specializers (t ((&context . project--within-roots-fallback) eql nil)) :qualifiers nil :call-con nil :function #f(compiled-function (project) #<bytecode 0x4f0874ce20019b2>))) :options nil) nil)
  #f(compiled-function (&rest args) #<bytecode 0xb8576de120222bf>)(nil)
  apply(#f(compiled-function (&rest args) #<bytecode 0xb8576de120222bf>) nil nil)
  #f(compiled-function (arg &rest args) #<bytecode 0x18eea06f65c4583>)(nil)
  apply(#f(compiled-function (arg &rest args) #<bytecode 0x18eea06f65c4583>) nil)
  project-root(nil)
  project-roots(nil)
  #f(compiled-function (project) #<bytecode 0x4f0874ce20019b2>)(nil)
  apply(#f(compiled-function (project) #<bytecode 0x4f0874ce20019b2>) nil nil)
  #f(compiled-function (arg &rest args) #<bytecode 0x3e454e2766dc583>)(nil)
  apply(#f(compiled-function (arg &rest args) #<bytecode 0x3e454e2766dc583>) nil)
  project-root(nil)
  project-remember-project(nil)
  project-switch-project("/ssh:mini:~/emacs/github/master/")
  (progn (project-switch-project "/ssh:mini:~/emacs/github/master/"))
  eval((progn (project-switch-project "/ssh:mini:~/emacs/github/master/")) t)
  elisp--eval-last-sexp(t)
  #f(compiled-function () #<bytecode 0x1866ec10fb12>)()
  handler-bind-1(#f(compiled-function () #<bytecode 0x1866ec10fb12>) (error) eval-expression--debug)
  eval-last-sexp(t)
  eval-print-last-sexp(nil)
  funcall-interactively(eval-print-last-sexp nil)
  call-interactively(eval-print-last-sexp nil nil)
  command-execute(eval-print-last-sexp)


In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin24.3.0) of 2025-03-31
 built on pro2
Repository revision: 1ed1cc83491311517ba46dff73fdc4383ffd4102
Repository branch: master
System Description:  macOS 15.3.2

Message #8 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: 77425 <at> debbugs.gnu.org
Cc: Visuwesh <visuweshm <at> gmail.com>
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 09:38:02 +0200

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> - emacs -Q -nw
>
> - Eval in *scratch* (or C-x p p equivalent)
>   (project-switch-project "/ssh:mini:~/emacs/github/master/")
>   where "/ssh:mini:~/emacs/github/master/" is a Git repository on another machien
>
> =>
>
> Debugger entered--Lisp error: (cl-no-applicable-method project-root nil)

Bisect gives

6aa60038ee999d25184a639ce0ac76b614e3afb6 is the first bad commit
commit 6aa60038ee999d25184a639ce0ac76b614e3afb6
Author: Visuwesh <visuweshm <at> gmail.com>
Date:   Mon Mar 3 13:56:04 2025 +0530
    Add new user option to exclude projects from being remembered
    
    * lisp/progmodes/project.el (project-list-exclude): Add new user
    option to exclude projects from being remembered.
    (project-remember-project): Consider the user option above.
    (project-switch-project): Use 'project-remember-project' instead.
    * doc/emacs/maintaining.texi (Managing Projects): Mention the new user option.
    * etc/NEWS: Announce the change.  (Bug#76587)
 doc/emacs/maintaining.texi |  9 +++++++++
 etc/NEWS                   |  7 +++++++
 lisp/progmodes/project.el  | 21 +++++++++++++++++++--
 3 files changed, 35 insertions(+), 2 deletions(-)

Author in CC.

Message #11 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 16:04:40 +0530

[வியாழன் ஏப்ரல் 03, 2025] Gerd Möllmann wrote:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>> - emacs -Q -nw
>>
>> - Eval in *scratch* (or C-x p p equivalent)
>>   (project-switch-project "/ssh:mini:~/emacs/github/master/")
>>   where "/ssh:mini:~/emacs/github/master/" is a Git repository on another machien
>>
>> =>
>>
>> Debugger entered--Lisp error: (cl-no-applicable-method project-root nil)
>
> Bisect gives
>
> 6aa60038ee999d25184a639ce0ac76b614e3afb6 is the first bad commit
> commit 6aa60038ee999d25184a639ce0ac76b614e3afb6
> Author: Visuwesh <visuweshm <at> gmail.com>
> Date:   Mon Mar 3 13:56:04 2025 +0530
>     Add new user option to exclude projects from being remembered
>     
>     * lisp/progmodes/project.el (project-list-exclude): Add new user
>     option to exclude projects from being remembered.
>     (project-remember-project): Consider the user option above.
>     (project-switch-project): Use 'project-remember-project' instead.
>     * doc/emacs/maintaining.texi (Managing Projects): Mention the new user option.
>     * etc/NEWS: Announce the change.  (Bug#76587)
>  doc/emacs/maintaining.texi |  9 +++++++++
>  etc/NEWS                   |  7 +++++++
>  lisp/progmodes/project.el  | 21 +++++++++++++++++++--
>  3 files changed, 35 insertions(+), 2 deletions(-)
>
> Author in CC.

Am I right to assume there's no existing Tramp connection to the mini
host?  The recipe signals an error because we call project-current with
MAYBE-PROMPT=nil in project-switch-project, and project-current binds
non-essential depending on the value of MAYBE-PROMPT:

(defun project-current (&optional maybe-prompt directory)
  ...
  (unless directory (setq directory (or project-current-directory-override
                                        default-directory)))
  (let* ((non-essential (not maybe-prompt))
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         (pr (project--find-in-directory directory)))
  ...

With a non-nil non-essential, no wonder project-current fails to return
the project object.  One possible remedy would to be have

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index e2cd5bfa231..dfadf67de27 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -2301,7 +2301,7 @@ project-switch-project
 When called in a program, it will use the project corresponding
 to directory DIR."
   (interactive (list (funcall project-prompter)))
-  (project-remember-project (project-current nil dir))
+  (project-remember-project (project-current t dir))
   (let ((command (if (symbolp project-switch-commands)
                      project-switch-commands
                    (project--switch-project-command dir)))

but I don't know if it is the right solution.  I hope Dmitry (CC'd) will
have a better answer.

Message #14 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 13:43:59 +0200

Visuwesh <visuweshm <at> gmail.com> writes:

> Am I right to assume there's no existing Tramp connection to the mini
> host?  

Yes, that's right.

Message #17 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Visuwesh <visuweshm <at> gmail.com>, Gerd Möllmann
 <gerd.moellmann <at> gmail.com>
Cc: 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no applicable
 method
Date: Thu, 3 Apr 2025 15:19:29 +0300

Hi!

On 03/04/2025 13:34, Visuwesh wrote:
> -  (project-remember-project (project-current nil dir))
> +  (project-remember-project (project-current t dir))

That looks good.

Message #20 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Dmitry Gutov <dmitry <at> gutov.dev>
Cc: Gerd Möllmann <gerd.moellmann <at> gmail.com>,
 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 18:47:54 +0530

[Message part 1 (text/plain, inline)]

[வியாழன் ஏப்ரல் 03, 2025] Dmitry Gutov wrote:

> Hi!
>
> On 03/04/2025 13:34, Visuwesh wrote:
>> -  (project-remember-project (project-current nil dir))
>> +  (project-remember-project (project-current t dir))
>
> That looks good.

Thanks, proper patch attached.

[0001-Fix-C-x-p-p-for-remote-directories-with-no-Tramp-con.patch (text/x-diff, attachment)]

Message #23 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 15:38:29 +0200

Visuwesh <visuweshm <at> gmail.com> writes:

> [வியாழன் ஏப்ரல் 03, 2025] Dmitry Gutov wrote:
>
>> Hi!
>>
>> On 03/04/2025 13:34, Visuwesh wrote:
>>> -  (project-remember-project (project-current nil dir))
>>> +  (project-remember-project (project-current t dir))
>>
>> That looks good.
>
> Thanks, proper patch attached.

Fix confirmed.

Message #26 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 15:53:38 +0200

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> Visuwesh <visuweshm <at> gmail.com> writes:
>
>> [வியாழன் ஏப்ரல் 03, 2025] Dmitry Gutov wrote:
>>
>>> Hi!
>>>
>>> On 03/04/2025 13:34, Visuwesh wrote:
>>>> -  (project-remember-project (project-current nil dir))
>>>> +  (project-remember-project (project-current t dir))
>>>
>>> That looks good.
>>
>> Thanks, proper patch attached.
>
> Fix confirmed.

Forgot the thanks :-/. So thanks for the quick fix! :-)

Message #29 received at 77425 <at> debbugs.gnu.org (full text, mbox):

From: Visuwesh <visuweshm <at> gmail.com>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: Dmitry Gutov <dmitry <at> gutov.dev>, 77425 <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no
 applicable method
Date: Thu, 03 Apr 2025 20:37:49 +0530

[வியாழன் ஏப்ரல் 03, 2025] Gerd Möllmann wrote:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>> Visuwesh <visuweshm <at> gmail.com> writes:
>>
>>> [வியாழன் ஏப்ரல் 03, 2025] Dmitry Gutov wrote:
>>>
>>>> Hi!
>>>>
>>>> On 03/04/2025 13:34, Visuwesh wrote:
>>>>> -  (project-remember-project (project-current nil dir))
>>>>> +  (project-remember-project (project-current t dir))
>>>>
>>>> That looks good.
>>>
>>> Thanks, proper patch attached.
>>
>> Fix confirmed.
>
> Forgot the thanks :-/. So thanks for the quick fix! :-)

You're welcome!  And thank you for the clear recipe and backtrace; it
helped me understand the bug within minutes, without having to reproduce
the bug on my end.  ;-)

Message #34 received at 77425-done <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Visuwesh <visuweshm <at> gmail.com>
Cc: Gerd Möllmann <gerd.moellmann <at> gmail.com>,
 77425-done <at> debbugs.gnu.org
Subject: Re: bug#77425: 31.0.50; Switching to remote project -> no applicable
 method
Date: Fri, 4 Apr 2025 02:20:15 +0300

On 03/04/2025 16:17, Visuwesh wrote:
> Thanks, proper patch attached.

Installed, thanks!

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