GNU bug report logs - #75817
[PATCH] profiles: emacs-subdirs: Avoid building list with a loop

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Package: guix-patches; Reported by: Thiago Jung Bauermann <bauermann@HIDDEN>; Keywords: patch; dated Fri, 24 Jan 2025 23:04:02 UTC; Maintainer for guix-patches is guix-patches@HIDDEN.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Subject: Re: [bug#75817] [PATCH v2] profiles: emacs-subdirs: Avoid building
 list with a loop
In-Reply-To: <a667a2d1fe5ef63598de0e3cb65eaf6df4da1c46.camel@HIDDEN>
 (Liliana Marie Prikler's message of "Sat, 25 Jan 2025 15:26:07 +0100")
References: <20250125041742.168342-1-bauermann@HIDDEN>
 <a667a2d1fe5ef63598de0e3cb65eaf6df4da1c46.camel@HIDDEN>
Date: Mon, 27 Jan 2025 09:41:07 +0100
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Hello,

Liliana Marie Prikler <liliana.prikler@HIDDEN> skribis:

> Am Samstag, dem 25.01.2025 um 01:14 -0300 schrieb Thiago Jung
> Bauermann:
>> If the EMACSNATIVELOADPATH environment variable (by mistake) has
>> duplicated
>> paths, Emacs fails to load with:
>>=20
>> =C2=A0 $ emacs
>> =C2=A0 List contains a loop:
>> =C2=A0 ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp" .
>> #2)
>> =C2=A0 $ echo $?
>> =C2=A0 255
>>=20
>> A git bisect in Guix to find when the problem was introduced arrived
>> at commit e9b13294700d ("profiles: emacs-subdirs: Also expand
>> native-comp-eln-load-path.").
>>=20
>> Fix the problem by applying Liliana's suggestion of changing 'nconc'
>> to 'append' in the Elisp code written to subdirs.el.
>>=20
>> * guix/profiles.scm (emacs-subdirs): Use 'append' rather than
>> 'nconc'.
>>=20
>> Change-Id: If646b806f24666b5247850d30d2819c7482c130b
>> Fixes: Emacs "List contains a loop" error
>> <https://issues.guix.gnu.org/75709>
>> Suggested-by: Liliana Marie Prikler <liliana.prikler@HIDDEN>
>> ---
> Reworded commit message slightly and pushed to emacs-team.  Let's wait
> a little for all Emacsen to rebuild on CI before merging this into
> master :)

Looking forward to applying this fix (exwm wouldn=E2=80=99t start this morn=
ing).
:-)

Ludo=E2=80=99.
Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

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From: Thiago Jung Bauermann <bauermann@HIDDEN>
To: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Subject: Re: [PATCH v2] profiles: emacs-subdirs: Avoid building list with a
 loop
In-Reply-To: <a667a2d1fe5ef63598de0e3cb65eaf6df4da1c46.camel@HIDDEN>
 (Liliana Marie Prikler's message of "Sat, 25 Jan 2025 15:26:07 +0100")
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 <a667a2d1fe5ef63598de0e3cb65eaf6df4da1c46.camel@HIDDEN>
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Liliana Marie Prikler <liliana.prikler@HIDDEN> writes:

> Am Samstag, dem 25.01.2025 um 01:14 -0300 schrieb Thiago Jung
> Bauermann:
>> If the EMACSNATIVELOADPATH environment variable (by mistake) has
>> duplicated
>> paths, Emacs fails to load with:
>>
>> =C2=A0 $ emacs
>> =C2=A0 List contains a loop:
>> =C2=A0 ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp" .
>> #2)
>> =C2=A0 $ echo $?
>> =C2=A0 255
>>
>> A git bisect in Guix to find when the problem was introduced arrived
>> at commit e9b13294700d ("profiles: emacs-subdirs: Also expand
>> native-comp-eln-load-path.").
>>
>> Fix the problem by applying Liliana's suggestion of changing 'nconc'
>> to 'append' in the Elisp code written to subdirs.el.
>>
>> * guix/profiles.scm (emacs-subdirs): Use 'append' rather than
>> 'nconc'.
>>
>> Change-Id: If646b806f24666b5247850d30d2819c7482c130b
>> Fixes: Emacs "List contains a loop" error
>> <https://issues.guix.gnu.org/75709>
>> Suggested-by: Liliana Marie Prikler <liliana.prikler@HIDDEN>
>> ---
> Reworded commit message slightly and pushed to emacs-team.  Let's wait
> a little for all Emacsen to rebuild on CI before merging this into
> master :)
>
> Thanks

Thank you!

--
Thiago
Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

Message received at 75817 <at> debbugs.gnu.org:


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Subject: Re: [PATCH v2] profiles: emacs-subdirs: Avoid building list with a
 loop
From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
To: Thiago Jung Bauermann <bauermann@HIDDEN>, 75817 <at> debbugs.gnu.org
Date: Sat, 25 Jan 2025 15:26:07 +0100
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Am Samstag, dem 25.01.2025 um 01:14 -0300 schrieb Thiago Jung
Bauermann:
> If the EMACSNATIVELOADPATH environment variable (by mistake) has
> duplicated
> paths, Emacs fails to load with:
>=20
> =C2=A0 $ emacs
> =C2=A0 List contains a loop:
> =C2=A0 ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native-=
site-lisp"
> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native-=
site-lisp" .
> #2)
> =C2=A0 $ echo $?
> =C2=A0 255
>=20
> A git bisect in Guix to find when the problem was introduced arrived
> at commit e9b13294700d ("profiles: emacs-subdirs: Also expand
> native-comp-eln-load-path.").
>=20
> Fix the problem by applying Liliana's suggestion of changing 'nconc'
> to 'append' in the Elisp code written to subdirs.el.
>=20
> * guix/profiles.scm (emacs-subdirs): Use 'append' rather than
> 'nconc'.
>=20
> Change-Id: If646b806f24666b5247850d30d2819c7482c130b
> Fixes: Emacs "List contains a loop" error
> <https://issues.guix.gnu.org/75709>
> Suggested-by: Liliana Marie Prikler <liliana.prikler@HIDDEN>
> ---
Reworded commit message slightly and pushed to emacs-team.  Let's wait
a little for all Emacsen to rebuild on CI before merging this into
master :)

Thanks
Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

Message received at 75817 <at> debbugs.gnu.org:


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From: Thiago Jung Bauermann <bauermann@HIDDEN>
To: 75817 <at> debbugs.gnu.org
Subject: [PATCH v2] profiles: emacs-subdirs: Avoid building list with a loop
Date: Sat, 25 Jan 2025 01:14:08 -0300
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If the EMACSNATIVELOADPATH environment variable (by mistake) has duplicated
paths, Emacs fails to load with:

  $ emacs
  List contains a loop:
  ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/gnu/store/…-emacs-lsp-mode-9.0.0/lib/emacs/native-site-lisp"
   "/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/gnu/store/…-emacs-lsp-mode-9.0.0/lib/emacs/native-site-lisp" . #2)
  $ echo $?
  255

A git bisect in Guix to find when the problem was introduced arrived at
commit e9b13294700d ("profiles: emacs-subdirs: Also expand
native-comp-eln-load-path.").

Fix the problem by applying Liliana's suggestion of changing 'nconc' to
'append' in the Elisp code written to subdirs.el.

* guix/profiles.scm (emacs-subdirs): Use 'append' rather than 'nconc'.

Change-Id: If646b806f24666b5247850d30d2819c7482c130b
Fixes: Emacs "List contains a loop" error <https://issues.guix.gnu.org/75709>
Suggested-by: Liliana Marie Prikler <liliana.prikler@HIDDEN>
---
 guix/profiles.scm | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Changes since v1:
Made the following changes suggested by Liliana:
- Added comment to Elisp comment warning about destructive procedures
- Added short bug description to "Fixes" tag.

diff --git a/guix/profiles.scm b/guix/profiles.scm
index 87b9543ac01f..fb4dbc5bd079 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -1230,8 +1230,12 @@ (define build
                         (setq native-comp-eln-load-path
                               (mapcan (lambda (dir)
                                         (if (equal dir needle)
-                                            (nconc ',native-comp-dirs
-                                                   (list dir))
+                                            ;; Note: needle may be found
+                                            ;; multiple times, so don't use
+                                            ;; destructive procedures like
+                                            ;; nconc.
+                                            (append ',native-comp-dirs
+                                                    (list dir))
                                             (list dir)))
                                       native-comp-eln-load-path))))
                    port)
Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

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From: Thiago Jung Bauermann <bauermann@HIDDEN>
To: Liliana Marie Prikler <liliana.prikler@HIDDEN>
Subject: Re: [PATCH] profiles: emacs-subdirs: Avoid building list with a loop
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Liliana Marie Prikler <liliana.prikler@HIDDEN> writes:

> Am Freitag, dem 24.01.2025 um 20:01 -0300 schrieb Thiago Jung
> Bauermann:
>> If the EMACSNATIVELOADPATH environment variable (by mistake) has
>> duplicated paths, Emacs fails to load with:
>>
>> =C2=A0 $ emacs
>> =C2=A0 List contains a loop:
>> =C2=A0 ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/home/user/.guix-profile/lib/emacs/native-site-lisp"
>> =C2=A0=C2=A0 "/gnu/store/=E2=80=A6-emacs-lsp-mode-9.0.0/lib/emacs/native=
-site-lisp" .
>> #2)
>> =C2=A0 $ echo $?
>> =C2=A0 255
>>
>> A git bisect in Guix to find when the problem was introduced arrived
>> at commit e9b13294700d ("profiles: emacs-subdirs: Also expand
>> native-comp-eln-load-path.").
>>
>> Fix the problem by applying Liliana's suggestion of changing 'nconc'
>> to 'append' in the Elisp code written to subdirs.el.
> It's better to describe the bug in code so that folks won't stumble
> over it again.  E.g. "Note: needle may be found multiple times, so
> don't use destructive procedures like nconc."

Good point. I added your suggested note as a comment in the Elisp code.

>> * guix/profiles.scm (emacs-subdirs): Use 'append' rather than
>> 'nconc'.
>>
>> Change-Id: If646b806f24666b5247850d30d2819c7482c130b
>> Fixes: <https://issues.guix.gnu.org/75709>
> You have some horizontal space here to name the bug :)

Indeed. I added a short description.

Thank you for your quick review!
--
Thiago
Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

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Subject: Re: [PATCH] profiles: emacs-subdirs: Avoid building list with a loop
From: Liliana Marie Prikler <liliana.prikler@HIDDEN>
To: Thiago Jung Bauermann <bauermann@HIDDEN>, 75817 <at> debbugs.gnu.org
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Information forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.

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From: Thiago Jung Bauermann <bauermann@HIDDEN>
To: guix-patches@HIDDEN
Subject: [PATCH] profiles: emacs-subdirs: Avoid building list with a loop
Date: Fri, 24 Jan 2025 20:01:35 -0300
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Cc: Liliana Marie Prikler <liliana.prikler@HIDDEN>,
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If the EMACSNATIVELOADPATH environment variable (by mistake) has duplicated
paths, Emacs fails to load with:

  $ emacs
  List contains a loop:
  ("/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/gnu/store/…-emacs-lsp-mode-9.0.0/lib/emacs/native-site-lisp"
   "/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/home/user/.guix-profile/lib/emacs/native-site-lisp"
   "/gnu/store/…-emacs-lsp-mode-9.0.0/lib/emacs/native-site-lisp" . #2)
  $ echo $?
  255

A git bisect in Guix to find when the problem was introduced arrived at
commit e9b13294700d ("profiles: emacs-subdirs: Also expand
native-comp-eln-load-path.").

Fix the problem by applying Liliana's suggestion of changing 'nconc' to
'append' in the Elisp code written to subdirs.el.

* guix/profiles.scm (emacs-subdirs): Use 'append' rather than 'nconc'.

Change-Id: If646b806f24666b5247850d30d2819c7482c130b
Fixes: <https://issues.guix.gnu.org/75709>
Suggested-by: Liliana Marie Prikler <liliana.prikler@HIDDEN>
---
 guix/profiles.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/guix/profiles.scm b/guix/profiles.scm
index 87b9543ac01f..63b2a08a48d4 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -1230,8 +1230,8 @@ (define build
                         (setq native-comp-eln-load-path
                               (mapcan (lambda (dir)
                                         (if (equal dir needle)
-                                            (nconc ',native-comp-dirs
-                                                   (list dir))
+                                            (append ',native-comp-dirs
+                                                    (list dir))
                                             (list dir)))
                                       native-comp-eln-load-path))))
                    port)
Acknowledgement sent to Thiago Jung Bauermann <bauermann@HIDDEN>:
New bug report received and forwarded. Copy sent to guix-patches@HIDDEN. Full text available.
Report forwarded to guix-patches@HIDDEN:
bug#75817; Package guix-patches. Full text available.
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