bug#52178: 29.0.50; process-environment not used in async-shell-command

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Damien Merenne]

When running an async process, the value of `process-environment' is
lost, in 'emacs -Q' scratch buffer:

    (let ((process-environment "EDITOR=test"))
      (shell-command "env &"))

and the output is my normal environment, not the limited one. When
removing the &, it works okay. I managed to pinpoint the problem to the
call to `with-current-buffer' in simple.el:4229. As process-environment
is buffer local, it is not passed in the process buffer. This patch
fixes it but I have no idea if this is the correct way to fix it:

@@ -4194,7 +4194,8 @@ shell-command
                               (or output-buffer shell-command-buffer-name-async)))
                      (bname (buffer-name buffer))
                      (proc (get-buffer-process buffer))
-                     (directory default-directory))
+                     (directory default-directory)
+                     (process-env process-environment))
 		;; Remove the ampersand.
 		(setq command (substring command 0 (match-beginning 0)))
 		;; Ask the user what to do with already running process.
@@ -4237,7 +4238,7 @@ shell-command
                                 (format "COLUMNS=%d"
                                         async-shell-command-width)))
                           (comint-term-environment)
-                          process-environment)))
+                          process-env)))
 		    (setq proc
 			  (start-process-shell-command "Shell" buffer command)))
 		  (setq mode-line-process '(":%s"))



In GNU Emacs 29.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version 3.24.25, cairo version 1.16.0)
 of 2021-11-29 built on workstation.lan
Repository revision: f5498a608fe85b66a4068a5ccf88c9b3d3b88f98
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101001
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bug#52178: 29.0.50; process-environment not used in async-shell-command

[Lars Ingebrigtsen]

Damien Merenne <dam@cosinux.org> writes:

> When running an async process, the value of `process-environment' is
> lost, in 'emacs -Q' scratch buffer:
>
>     (let ((process-environment "EDITOR=test"))
>       (shell-command "env &"))

I think you mean

    (let ((process-environment '("EDITOR=test")))
      (shell-command "env &"))

> and the output is my normal environment, not the limited one. When
> removing the &, it works okay. I managed to pinpoint the problem to the
> call to `with-current-buffer' in simple.el:4229. As process-environment
> is buffer local, it is not passed in the process buffer.

process-environment is not buffer-local by default, though, so the test
case works fine normally.  Do you have a complete case to reproduce the
problem, starting from "emacs -Q"?

> This patch fixes it but I have no idea if this is the correct way to
> fix it:

The patch wasn't complete, so I've recreated it and included below for
reference.

It makes sense to me, but I'd like to know where this fixes anything
before applying.

diff --git a/lisp/simple.el b/lisp/simple.el
index 84928caa31..e38988f916 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -4194,7 +4194,8 @@ shell-command
                               (or output-buffer shell-command-buffer-name-async)))
                      (bname (buffer-name buffer))
                      (proc (get-buffer-process buffer))
-                     (directory default-directory))
+                     (directory default-directory)
+                     (process-env process-environment))
 		;; Remove the ampersand.
 		(setq command (substring command 0 (match-beginning 0)))
 		;; Ask the user what to do with already running process.
@@ -4237,7 +4238,7 @@ shell-command
                                 (format "COLUMNS=%d"
                                         async-shell-command-width)))
                           (comint-term-environment)
-                          process-environment)))
+                          process-env)))
 		    (setq proc
 			  (start-process-shell-command "Shell" buffer command)))
 		  (setq mode-line-process '(":%s"))


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Damien Merenne]

Le lun. 29 nov. 2021 à 14:38, Lars Ingebrigtsen <larsi@gnus.org> a écrit :
> Do you have a complete case to reproduce the
> problem, starting from "emacs -Q"?
So indeed I thought I was able to reprodce it in `emacs -Q` but it was
due to the bug in my snippet.
Now I can't reproduce it anyore with `emacs -Q`.

The `process-environment` seems to be switch to a buffer-local
variable due to some autoload
because right after initialization, its still a normal variable. At
some point I do something and
whoops, it is converted to a buffer local...

I'll try to find what's triggering it but its not obvious.

-- 
Damien Merenne <dam@cosinux.org>

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Lars Ingebrigtsen]

Damien Merenne <dam@cosinux.org> writes:

> I'll try to find what's triggering it but its not obvious.

Did you make any progress here?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Michael Heerdegen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Damien Merenne <dam@cosinux.org> writes:
>
> > I'll try to find what's triggering it but its not obvious.
>
> Did you make any progress here?

Damien, maybe using a variable watcher:

  (info "(elisp) Watching Variables")

could help to understand what's going on?  They are able to notice
changes in buffer-localness.

Michael.

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Damien Merenne]

Thanks for the reminder and the pointer to the watcher! I finally
found that it happens due to the `envrc` package.
That package is meant to set `process-environment` buffer local for
some buffers. Somehow it sets
process-environment globally local but only when emacs is started as a
daemon from the systemd unit. Running
it normally or with --fg-daemon from a terminal does not set the
variable globally local. I'll check with the envrc
maintainer why that would be but there is still something strange
going on, I would not expect Emacs behaviour to
 change when started in systemd.

For people stumbling upon this, here is the code I used to pinpoint the problem:
```
(defvar pltraces (list (cons "early-init.el" (local-variable-p
'process-environment))))
(add-hook 'after-load-functions
          (lambda (fn)
            (setq pltraces (cons (cons fn (local-variable-p
'process-environment)) pltraces))))
(add-variable-watcher 'process-environment
                      (lambda (symbol newval operation where)
                        (when where
                          (setq pltraces (cons (cons (buffer-name
where) (local-variable-p 'process-environment)) pltraces)))))
```
It records the place where the variable is set and its local status in
the `pltraces` variable.

-- 
Damien MERENNE   <dam@cosinux.org>

Le sam. 15 janv. 2022 à 21:39, Michael Heerdegen
<michael_heerdegen@web.de> a écrit :
>
> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
> > Damien Merenne <dam@cosinux.org> writes:
> >
> > > I'll try to find what's triggering it but its not obvious.
> >
> > Did you make any progress here?
>
> Damien, maybe using a variable watcher:
>
>   (info "(elisp) Watching Variables")
>
> could help to understand what's going on?  They are able to notice
> changes in buffer-localness.
>
> Michael.

bug#52178: 29.0.50; process-environment not used in async-shell-command

[Damien Merenne]

But still, the envrc use case for making process-environment buffer
local for some buffer is still valid and I think the original problem
should be fixed.
-- 
Damien MERENNE   <dam@cosinux.org>

Le dim. 16 janv. 2022 à 10:49, Damien Merenne <dam@cosinux.org> a écrit :
>
> Thanks for the reminder and the pointer to the watcher! I finally
> found that it happens due to the `envrc` package.
> That package is meant to set `process-environment` buffer local for
> some buffers. Somehow it sets
> process-environment globally local but only when emacs is started as a
> daemon from the systemd unit. Running
> it normally or with --fg-daemon from a terminal does not set the
> variable globally local. I'll check with the envrc
> maintainer why that would be but there is still something strange
> going on, I would not expect Emacs behaviour to
>  change when started in systemd.
>
> For people stumbling upon this, here is the code I used to pinpoint the problem:
> ```
> (defvar pltraces (list (cons "early-init.el" (local-variable-p
> 'process-environment))))
> (add-hook 'after-load-functions
>           (lambda (fn)
>             (setq pltraces (cons (cons fn (local-variable-p
> 'process-environment)) pltraces))))
> (add-variable-watcher 'process-environment
>                       (lambda (symbol newval operation where)
>                         (when where
>                           (setq pltraces (cons (cons (buffer-name
> where) (local-variable-p 'process-environment)) pltraces)))))
> ```
> It records the place where the variable is set and its local status in
> the `pltraces` variable.
>
> --
> Damien MERENNE   <dam@cosinux.org>
>
> Le sam. 15 janv. 2022 à 21:39, Michael Heerdegen
> <michael_heerdegen@web.de> a écrit :
> >
> > Lars Ingebrigtsen <larsi@gnus.org> writes:
> >
> > > Damien Merenne <dam@cosinux.org> writes:
> > >
> > > > I'll try to find what's triggering it but its not obvious.
> > >
> > > Did you make any progress here?
> >
> > Damien, maybe using a variable watcher:
> >
> >   (info "(elisp) Watching Variables")
> >
> > could help to understand what's going on?  They are able to notice
> > changes in buffer-localness.
> >
> > Michael.