GNU bug report logs - #68570
29.1; recompile might not re-use project-compile's buffer

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Package: emacs; Reported by: Jörg Bornemann <foss@HIDDEN>; dated Thu, 18 Jan 2024 16:58:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Juri Linkov <juri@HIDDEN>
To: Dmitry Gutov <dmitry@HIDDEN>
Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
 buffer
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Date: Wed, 24 Jan 2024 19:11:35 +0200
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>>>> Recompiling from a non-compilation buffer has security concerns.
>>>> The patch that I proposed above is intended only for
>>>> recompiling from a compilation buffer.  It sets
>>>> `compilation-buffer-name-function' in the compilation buffer.
>>> I think it behaves correctly inside the compilation buffer already? At
>>> least it did when I tested.
>> Sorry, I didn't show my compilation function:
>> (setopt project-compilation-buffer-name-function
>>          (lambda (name-of-mode)
>>            (generate-new-buffer-name
>>             (project-prefixed-buffer-name name-of-mode))))
>> Currently 'g' doesn't create a new compilation buffer, because
>> 'compilation--default-buffer-name' just reuses the current buffer.
>
> Is that bad?

It's very useful to always create a unique buffer for every compilation:
this allows keeping error messages from previous compilations.
I propose even to add such an option to the choice list in
project-compilation-buffer-name-function, e.g.:

(defcustom project-compilation-buffer-name-function nil
  :type '(choice (const :tag "Default" nil)
                 (const :tag "Prefixed with project name"
                        project-prefixed-buffer-name)
                 (const :tag "Prefixed and unique with project name"
                        project-prefixed-unique-buffer-name)
                 (function :tag "Custom function")))

The previous patch would be needed as well since currently
there is no way to allow unique project compilation buffers.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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Date: Wed, 24 Jan 2024 14:06:57 +0200
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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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To: Juri Linkov <juri@HIDDEN>
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On 24/01/2024 09:46, Juri Linkov wrote:
>>> Recompiling from a non-compilation buffer has security concerns.
>>> The patch that I proposed above is intended only for
>>> recompiling from a compilation buffer.  It sets
>>> `compilation-buffer-name-function' in the compilation buffer.
>> I think it behaves correctly inside the compilation buffer already? At
>> least it did when I tested.
> Sorry, I didn't show my compilation function:
> 
> (setopt project-compilation-buffer-name-function
>          (lambda (name-of-mode)
>            (generate-new-buffer-name
>             (project-prefixed-buffer-name name-of-mode))))
> 
> Currently 'g' doesn't create a new compilation buffer, because
> 'compilation--default-buffer-name' just reuses the current buffer.

Is that bad?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Dmitry Gutov <dmitry@HIDDEN>
Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
 buffer
In-Reply-To: <0598898e-8e25-43b1-92c0-4596ad242ec8@HIDDEN> (Dmitry Gutov's
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>> Recompiling from a non-compilation buffer has security concerns.
>> The patch that I proposed above is intended only for
>> recompiling from a compilation buffer.  It sets
>> `compilation-buffer-name-function' in the compilation buffer.
>
> I think it behaves correctly inside the compilation buffer already? At
> least it did when I tested.

Sorry, I didn't show my compilation function:

(setopt project-compilation-buffer-name-function
        (lambda (name-of-mode)
          (generate-new-buffer-name
           (project-prefixed-buffer-name name-of-mode))))

Currently 'g' doesn't create a new compilation buffer, because
'compilation--default-buffer-name' just reuses the current buffer.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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On 23/01/2024 15:15, Jörg Bornemann wrote:
> After reading Pengji's security concern (thanks Dmitry for pointing me 
> to it) I also think that it would be more favorable to let recompile 
> re-use a compilation buffer.  That would indeed make project-recompile 
> superfluous.

I don't know if it would: the compilation buffer might not be the only 
one - or the existing one might not belong to the current project.




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On 1/23/24 13:21, Dmitry Gutov wrote:

>> The patch that I proposed above is intended only for
>> recompiling from a compilation buffer.  It sets
>> `compilation-buffer-name-function' in the compilation buffer.
> 
> I think it behaves correctly inside the compilation buffer already? At 
> least it did when I tested.

Yes.  I can confirm that pressing g in a compilation buffer that's named 
by project-compilation-name-buffer-function is already working correctly.

After reading Pengji's security concern (thanks Dmitry for pointing me 
to it) I also think that it would be more favorable to let recompile 
re-use a compilation buffer.  That would indeed make project-recompile 
superfluous.




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On 23/01/2024 09:09, Juri Linkov wrote:
>>> This patch would allow 'recompile' to use the renamed project compilation buffer:
>>>
>> [...]
>>> Then 'project-recompile' won't be needed anymore.
>> IIUC that sets `compilation-buffer-name-function' in the buffer that was
>> active when you ran `project-compile'.  If you run `recompile' in another
>> buffer of the project then `recompile' won't re-use the `project-compile'
>> buffer.
> Recompiling from a non-compilation buffer has security concerns.
> 
> The patch that I proposed above is intended only for
> recompiling from a compilation buffer.  It sets
> `compilation-buffer-name-function' in the compilation buffer.

I think it behaves correctly inside the compilation buffer already? At 
least it did when I tested.




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>> This patch would allow 'recompile' to use the renamed project compilation buffer:
>>
> [...]
>> Then 'project-recompile' won't be needed anymore.
>
> IIUC that sets `compilation-buffer-name-function' in the buffer that was
> active when you ran `project-compile'.  If you run `recompile' in another
> buffer of the project then `recompile' won't re-use the `project-compile'
> buffer.

Recompiling from a non-compilation buffer has security concerns.

The patch that I proposed above is intended only for
recompiling from a compilation buffer.  It sets
`compilation-buffer-name-function' in the compilation buffer.




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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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To: =?UTF-8?Q?J=C3=B6rg_Bornemann?= <foss@HIDDEN>,
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On 22/01/2024 10:42, Jörg Bornemann wrote:
> On 1/22/24 08:31, Juri Linkov wrote:
> 
>> This patch would allow 'recompile' to use the renamed project 
>> compilation buffer:
>>
> [...]
>>
>> Then 'project-recompile' won't be needed anymore.
> 
> IIUC that sets `compilation-buffer-name-function' in the buffer that was 
> active when you ran `project-compile'.  If you run `recompile' in 
> another buffer of the project then `recompile' won't re-use the 
> `project-compile' buffer.

Yes, that doesn't sound optimal.




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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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To: =?UTF-8?Q?J=C3=B6rg_Bornemann?= <foss@HIDDEN>, 68570 <at> debbugs.gnu.org
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On 22/01/2024 10:39, Jörg Bornemann wrote:
>> Not sure if we should close this report now, or perhaps keep it open 
>> to discuss the security issue.
> 
> What security concerns do you have?

The one mentioned by Penji Zhang in 
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=68570#8

I suppose he didn't Cc you, so you didn't see the message.




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On 1/22/24 08:31, Juri Linkov wrote:

> This patch would allow 'recompile' to use the renamed project compilation buffer:
> 
[...]
> 
> Then 'project-recompile' won't be needed anymore.

IIUC that sets `compilation-buffer-name-function' in the buffer that was 
active when you ran `project-compile'.  If you run `recompile' in 
another buffer of the project then `recompile' won't re-use the 
`project-compile' buffer.




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On 1/21/24 06:09, Dmitry Gutov wrote:

> I've pushed to master a new command called that (commit 0a07603ae8d), 
> like discussed on the mailing list.

Thanks!

> Not sure if we should close this report now, or perhaps keep it open to 
> discuss the security issue.

What security concerns do you have?




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bug#68570; Package emacs. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Dmitry Gutov <dmitry@HIDDEN>
Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
 buffer
In-Reply-To: <60842df3-8a64-4bde-b6d6-f94b9a964a17@HIDDEN> (Dmitry Gutov's
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>>>> Although I'm thinking by now that it might be more consistent to have
>>>> a separate project-recompile command in addition to
>>>> recompile.
>>> I've pushed to master a new command called that (commit 0a07603ae8d), like
>>> discussed on the mailing list.
>> Shouldn't now 'g' in project buffers use 'project-recompile'?
>
> I don't know if it should - AFAICS 'M-x recompile' doesn't rename the
> current buffer, so it seems like the current behavior is already correct.

This patch would allow 'recompile' to use the renamed project compilation buffer:

diff --git a/lisp/progmodes/project.el b/lisp/progmodes/project.el
index ab4504fa027..58bf2401dac 100644
--- a/lisp/progmodes/project.el
+++ b/lisp/progmodes/project.el
@@ -1395,7 +1395,10 @@ project-compile
         (compilation-buffer-name-function
          (or project-compilation-buffer-name-function
              compilation-buffer-name-function)))
-    (call-interactively #'compile)))
+    (with-current-buffer (call-interactively #'compile)
+      (when project-compilation-buffer-name-function
+        (setq-local compilation-buffer-name-function
+                    project-compilation-buffer-name-function)))))
 
 (defun project-recompile (&optional edit-command)
   "Run `recompile' with appropriate buffer."

Then 'project-recompile' won't be needed anymore.




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bug#68570; Package emacs. Full text available.

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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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On 21/01/2024 20:18, Juri Linkov wrote:
>>> Although I'm thinking by now that it might be more consistent to have
>>> a separate project-recompile command in addition to
>>> recompile.
>> I've pushed to master a new command called that (commit 0a07603ae8d), like
>> discussed on the mailing list.
> Shouldn't now 'g' in project buffers use 'project-recompile'?

I don't know if it should - AFAICS 'M-x recompile' doesn't rename the 
current buffer, so it seems like the current behavior is already correct.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Dmitry Gutov <dmitry@HIDDEN>
Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
 buffer
In-Reply-To: <320b09d1-2af4-4110-bdf3-94da122f3dd6@HIDDEN> (Dmitry Gutov's
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>> Although I'm thinking by now that it might be more consistent to have
>> a separate project-recompile command in addition to
>> recompile.
>
> I've pushed to master a new command called that (commit 0a07603ae8d), like
> discussed on the mailing list.

Shouldn't now 'g' in project buffers use 'project-recompile'?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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On 18/01/2024 18:17, Jörg Bornemann wrote:
> Although I'm thinking by now that it might be more consistent to have a 
> separate project-recompile command in addition to
> recompile.

I've pushed to master a new command called that (commit 0a07603ae8d), 
like discussed on the mailing list.

Not sure if we should close this report now, or perhaps keep it open to 
discuss the security issue.




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bug#68570; Package emacs. Full text available.

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Subject: Re: bug#68570: 29.1; recompile might not re-use project-compile's
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To: Pengji Zhang <kunhtkun@HIDDEN>, 68570 <at> debbugs.gnu.org
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On 19/01/2024 22:19, Pengji Zhang wrote:
> I think you meant running `M-x recompile' not in a compilation buffer?
> While I agree that is convenient, I suppose it is better to only use
> `recompile' in a compilation buffer due to security reasons.
> 
> `compile-command' is marked as a safe local variable assuming that the
> user would be prompted to check and confirm the command before running
> it. That is the behavior of `compile' but not `recompile'. For
> example, create a file '/tmp/test.c' with the following contents:
> 
>      /* Local Variables: */
>      /* compile-command: "echo 1" */
>      /* End: */
> 
> Then:
>    - emacs -Q --eval "(require 'compile)"
>    - C-x C-f /tmp/test.c
>    - M-x recompile
> 
> So we could run arbitrary commands without any warning or confirmation.

It seems like you found a security issue in 'M-x recompile'. It's 
orthogonal to this feature request, though.

> Instead of a `project-recompile' command, it might be better to make
> `recompile' find the existing compilation buffer for the current
> buffer, and refuse to run the command (or ask for confirmation) if
> there is no such buffer.

This sounds like a good plan for fixing the above issue.

But the step "find the existing compilation buffer for the current 
buffer" requires compilation-buffer-name-function to be set to an 
appropriate value. And project-compile only binds it temporarily.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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Subject: Re: bug#68570: 29.1;
 recompile might not re-use project-compile's buffer
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Hi!

I think you meant running `M-x recompile' not in a compilation buffer?
While I agree that is convenient, I suppose it is better to only use
`recompile' in a compilation buffer due to security reasons.

`compile-command' is marked as a safe local variable assuming that the
user would be prompted to check and confirm the command before running
it. That is the behavior of `compile' but not `recompile'. For
example, create a file '/tmp/test.c' with the following contents:

    /* Local Variables: */
    /* compile-command: "echo 1" */
    /* End: */

Then:
  - emacs -Q --eval "(require 'compile)"
  - C-x C-f /tmp/test.c
  - M-x recompile

So we could run arbitrary commands without any warning or confirmation.

Instead of a `project-recompile' command, it might be better to make
`recompile' find the existing compilation buffer for the current
buffer, and refuse to run the command (or ask for confirmation) if
there is no such buffer.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.

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One can use project-compile to build a project and then call recompile
to repeat the compilation.  This reuses the buffer named
"*compilation*".

If I set project-compilation-buffer-name-function to
#'project-prefixed-buffer-name, this creates a compilation buffer
"*myproject-compilation*" when executing project-compile.  Now,
recompile won't re-use "*myproject-compilation*" but create a new
buffer "*compilation*".

To reproduce this behavior, it is enough to start Emacs like this:
$ emacs -Q --eval "(setq project-compilation-buffer-name-function 
#'project-prefixed-buffer-name)"

It would be nice if recompile could re-use project-compile's buffer 
name.  I have fixed this locally by setting 
compilation-buffer-name-function like this:

---snip---
   (defun my-compilation-buffer-name (name-of-mode)
     (if (project-current)
         (apply project-compilation-buffer-name-function (list 
name-of-mode))
       (compilation--default-buffer-name name-of-mode)))

   (setq compilation-buffer-name-function #'my-compilation-buffer-name)
---snap---

Although I'm thinking by now that it might be more consistent to have a 
separate project-recompile command in addition to
recompile.

What do you think?  On one hand is the above fix quite convenient but on 
the other, compilation-buffer-name-function probably should not have 
project.el-specific knowledge.




Acknowledgement sent to Jörg Bornemann <foss@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#68570; Package emacs. Full text available.
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