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Subject: bug#74550: eshell cannot set the environment variable PATH on Windows
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Reproduce steps:

1. Emacs -Q

2. M-x eval-expression `(setenv "PATH" (concat "C:/env" path-separator
(getenv "PATH")))`

3. M-x eshell

4. In the *eshell* window, type `echo $PATH`, but the path "C:/env" doesn't
show in the result.

P.S. I have also tried `eshell-set-path` and `with-environment-variables`,
but they cannot set PATH as well. For example,

(require 'eshell)

(defun eshell2()
  (interactive)
  (eshell-set-path '("C:/env"))
  (call-interactively 'eshell))

(defun eshell3()
  (interactive)
  (with-environment-variables (("PATH" (concat "C:/env" path-separator
(getenv "PATH"))))
    (call-interactively 'eshell)))

Emacs 29.4 on Windows 10.

Thanks.

Best regards,
Siyuan Chen

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<div dir=3D"ltr">Reproduce steps:<br><br>1. Emacs -Q<br><br>2. M-x eval-exp=
ression `(setenv &quot;PATH&quot; (concat &quot;C:/env&quot; path-separator=
 (getenv &quot;PATH&quot;)))`<br><br>3. M-x eshell<br><br>4. In the *eshell=
* window, type `echo $PATH`, but the path &quot;C:/env&quot; doesn&#39;t sh=
ow in the result.<br><br>P.S. I have also tried `eshell-set-path` and `with=
-environment-variables`, but they cannot set PATH  as well. For example,<br=
><div><br></div><div>(require &#39;eshell)</div><div><br></div>(defun eshel=
l2()<br>=C2=A0 (interactive)<br>=C2=A0 (eshell-set-path &#39;(&quot;C:/env&=
quot;))<br>=C2=A0 (call-interactively &#39;eshell))<br><br>(defun eshell3()=
<br>=C2=A0 (interactive)<br>=C2=A0 (with-environment-variables ((&quot;PATH=
&quot; (concat &quot;C:/env&quot; path-separator (getenv &quot;PATH&quot;))=
))<br><div>=C2=A0 =C2=A0 (call-interactively &#39;eshell)))</div><div><br><=
/div><div>
Emacs 29.4 on Windows 10.<br></div><div><br></div><div>
<div>Thanks.</div><div><br></div><div>Best regards,</div><div>Siyuan Chen</=
div>

</div><div><br></div><div><br></div></div>

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To: Siyuan Chen <chansey97@HIDDEN>
Subject: bug#74550: Acknowledgement (eshell cannot set the environment
 variable PATH on Windows)
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Subject: bug#74550: eshell cannot set the environment variable PATH on Windows
Resent-From: Jim Porter <jporterbugs@HIDDEN>
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On 11/26/2024 12:38 PM, Siyuan Chen wrote:
> Reproduce steps:
> 
> 1. Emacs -Q
> 
> 2. M-x eval-expression `(setenv "PATH" (concat "C:/env" path-separator 
> (getenv "PATH")))`
> 
> 3. M-x eshell
> 
> 4. In the *eshell* window, type `echo $PATH`, but the path "C:/env" 
> doesn't show in the result.

Thanks for the bug report. This is an intentionally-incompatible change 
in Eshell to improve behavior with remote systems via Tramp. Here's the 
relevant section from the Emacs 29 NEWS:

> *** Eshell's PATH is now derived from 'exec-path'.
> For consistency with remote connections, Eshell now uses 'exec-path'
> to determine the execution path on the local or remote system, instead
> of using the PATH environment variable directly.

So instead, you want to do something like '(push "C:/env" exec-path)' in 
order to update the PATH in a way where Eshell sees it.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#74550: eshell cannot set the environment variable PATH on Windows
Resent-From: Siyuan Chen <chansey97@HIDDEN>
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From: Siyuan Chen <chansey97@HIDDEN>
Date: Thu, 28 Nov 2024 01:15:34 +0800
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--00000000000021880d0627e81d9e
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Dear Jim,

It works, thanks.

However, this seems to be a global setting only. Is there any equivalent of
with-environment-variables for exec-path?

For example, with regular shell, I can do something like:

```
(defun shell1 ()
  (interactive)
  (let ((explicit-shell-file-name "cmdproxy")
        (current-prefix-arg 4))
    (with-environment-variables (("PATH" (concat "C:/env1" path-separator
(getenv "PATH"))))
      (call-interactively 'shell))
    ))

(defun shell2 ()
  (interactive)
  (let ((explicit-shell-file-name "cmdproxy")
        (current-prefix-arg 4))
    (with-environment-variables (("PATH" (concat "C:/env2" path-separator
(getenv "PATH"))))
      (call-interactively 'shell))
    ))
```

to create two *shell* buffers with different PATH "C:/env1" and "C:/env2".

How to do the same thing in eshell?

I have tried with the following code but it doesn't work as expected.

 ```
 (defun eshell1()
  (interactive)
  (let ((exec-path (cons "C:/env1" (copy-sequence exec-path)))
        (current-prefix-arg "new"))
    (call-interactively 'eshell)))
 ```

 ```
 (defun eshell2()
  (interactive)
  (let ((exec-path (cons "C:/env2" (copy-sequence exec-path)))
        (current-prefix-arg "new"))
    (call-interactively 'eshell)))
 ```

M-x eshell1 and echo $PATH

M-x eshell2 and echo $PATH

The result is that the eshell1 buffer can show C:/env1, but eshell2 can not=
.

Thanks.

Best regards,
Siyuan Chen

On Wed, Nov 27, 2024 at 5:14=E2=80=AFAM Jim Porter <jporterbugs@HIDDEN> =
wrote:

> On 11/26/2024 12:38 PM, Siyuan Chen wrote:
> > Reproduce steps:
> >
> > 1. Emacs -Q
> >
> > 2. M-x eval-expression `(setenv "PATH" (concat "C:/env" path-separator
> > (getenv "PATH")))`
> >
> > 3. M-x eshell
> >
> > 4. In the *eshell* window, type `echo $PATH`, but the path "C:/env"
> > doesn't show in the result.
>
> Thanks for the bug report. This is an intentionally-incompatible change
> in Eshell to improve behavior with remote systems via Tramp. Here's the
> relevant section from the Emacs 29 NEWS:
>
> > *** Eshell's PATH is now derived from 'exec-path'.
> > For consistency with remote connections, Eshell now uses 'exec-path'
> > to determine the execution path on the local or remote system, instead
> > of using the PATH environment variable directly.
>
> So instead, you want to do something like '(push "C:/env" exec-path)' in
> order to update the PATH in a way where Eshell sees it.
>
>

--00000000000021880d0627e81d9e
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<div dir=3D"ltr"><div>Dear Jim,<br></div><div dir=3D"ltr"><br></div><div di=
r=3D"ltr">It works, thanks.<br><br>However, this seems to be a global setti=
ng only. Is there any equivalent of with-environment-variables for exec-pat=
h? <br><br>For example, with regular shell, I can do something like:<br><br=
>```<br>(defun shell1 ()<br>=C2=A0 (interactive)<br>=C2=A0 (let ((explicit-=
shell-file-name &quot;cmdproxy&quot;)<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (curre=
nt-prefix-arg 4))<br>=C2=A0 =C2=A0 (with-environment-variables ((&quot;PATH=
&quot; (concat &quot;C:/env1&quot; path-separator (getenv &quot;PATH&quot;)=
)))<br>=C2=A0 =C2=A0 =C2=A0 (call-interactively &#39;shell))<br>=C2=A0 =C2=
=A0 ))<br><br>(defun shell2 ()<br>=C2=A0 (interactive)<br>=C2=A0 (let ((exp=
licit-shell-file-name &quot;cmdproxy&quot;)<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
(current-prefix-arg 4))<br>=C2=A0 =C2=A0 (with-environment-variables ((&quo=
t;PATH&quot; (concat &quot;C:/env2&quot; path-separator (getenv &quot;PATH&=
quot;))))<br>=C2=A0 =C2=A0 =C2=A0 (call-interactively &#39;shell))<br>=C2=
=A0 =C2=A0 ))<br>```<br>=C2=A0<br>to create two *shell* buffers with differ=
ent PATH &quot;C:/env1&quot; and &quot;C:/env2&quot;.</div><div dir=3D"ltr"=
><br></div><div dir=3D"ltr">How to do the same thing in eshell?</div><div d=
ir=3D"ltr"><br></div><div dir=3D"ltr">I have tried with the following code =
but it doesn&#39;t work as expected. <br>=C2=A0<br>=C2=A0```<br>=C2=A0(defu=
n eshell1()<br>=C2=A0 (interactive)<br>=C2=A0 (let ((exec-path (cons &quot;=
C:/env1&quot; (copy-sequence exec-path)))<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (c=
urrent-prefix-arg &quot;new&quot;))<br>=C2=A0 =C2=A0 (call-interactively &#=
39;eshell)))<br>=C2=A0```<br>=C2=A0<br>=C2=A0```<br>=C2=A0(defun eshell2()<=
br>=C2=A0 (interactive)<br>=C2=A0 (let ((exec-path (cons &quot;C:/env2&quot=
; (copy-sequence exec-path)))<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (current-prefi=
x-arg &quot;new&quot;))<br>=C2=A0 =C2=A0 (call-interactively &#39;eshell)))=
<br>=C2=A0```<br>=C2=A0<br>M-x eshell1 and echo $PATH<br><br>M-x eshell2 an=
d echo $PATH<br>=C2=A0</div><div dir=3D"ltr">The result is that the=20
eshell1=20

buffer can show C:/env1, but eshell2 can not.<div><span class=3D"gmail-HwtZ=
e" lang=3D"en"></span> <br></div><div>
<div>Thanks.</div><div><br></div><div>Best regards,</div><div>Siyuan Chen</=
div>

</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Wed, Nov 27, 2024 at 5:14=E2=80=AFAM Jim Porter &lt;<a href=3D"mai=
lto:jporterbugs@HIDDEN">jporterbugs@HIDDEN</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">On 11/26/2024 12:38 PM, Siy=
uan Chen wrote:<br>
&gt; Reproduce steps:<br>
&gt; <br>
&gt; 1. Emacs -Q<br>
&gt; <br>
&gt; 2. M-x eval-expression `(setenv &quot;PATH&quot; (concat &quot;C:/env&=
quot; path-separator <br>
&gt; (getenv &quot;PATH&quot;)))`<br>
&gt; <br>
&gt; 3. M-x eshell<br>
&gt; <br>
&gt; 4. In the *eshell* window, type `echo $PATH`, but the path &quot;C:/en=
v&quot; <br>
&gt; doesn&#39;t show in the result.<br>
<br>
Thanks for the bug report. This is an intentionally-incompatible change <br=
>
in Eshell to improve behavior with remote systems via Tramp. Here&#39;s the=
 <br>
relevant section from the Emacs 29 NEWS:<br>
<br>
&gt; *** Eshell&#39;s PATH is now derived from &#39;exec-path&#39;.<br>
&gt; For consistency with remote connections, Eshell now uses &#39;exec-pat=
h&#39;<br>
&gt; to determine the execution path on the local or remote system, instead=
<br>
&gt; of using the PATH environment variable directly.<br>
<br>
So instead, you want to do something like &#39;(push &quot;C:/env&quot; exe=
c-path)&#39; in <br>
order to update the PATH in a way where Eshell sees it.<br>
<br>
</blockquote></div></div>

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On 11/27/2024 9:15 AM, Siyuan Chen wrote:
> It works, thanks.
> 
> However, this seems to be a global setting only. Is there any equivalent 
> of with-environment-variables for exec-path?

Not exactly. However, you can use setq-local or eshell/addpath:

   (defun shell1 ()
     (interactive)
     (let ((current-prefix-arg 4))
       (call-interactively 'shell)
       (setq-local exec-path (cons "C:/foo" exec-path))
       ;; or ...
       (eshell/addpath "-b" "C:/foo")))

That's probably the best way to do it for now. I think it's probably 
reasonable for Eshell to work correctly when you've let-bound 
'exec-path' like in your examples, but I'll have to think about the best 
way to do it.

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