GNU bug report logs - #78363
Home is read-only in guix shell container

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Package: guix; Reported by: keinflue <keinflue@HIDDEN>; merged with #78440; Done: Ludovic Courtès <ludo@HIDDEN>; Maintainer for guix is bug-guix@HIDDEN.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#78363: [PATCH 3/3] environment: Make home writable.
In-Reply-To: <31fa9dec8077b8190a840fe2ff17639f522b7d06.1747575576.git.~@wolfsden.cz>
 (Tomas Volf's message of "Sun, 18 May 2025 15:39:36 +0200")
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Hello,

Tomas Volf <~@wolfsden.cz> writes:

> * guix/scripts/environment.scm (launch-environment/container): Add tmpfs =
for
> home.
> * tests/guix-environment-container.sh: Add test.
>
> Change-Id: Iadd9b838f6442a8080998ed7e07414db562068bf

I added a =E2=80=9CFixes=E2=80=9D line referencing the initial bug report a=
nd applied
all three patches.  Thanks!

  11e88de060 * environment: Make home writable.
  7a888d9841 * environment: Translate only file names under home directory.
  8654aecf74 * environment: Use inherit for new mapping.

Ludo=E2=80=99.
Notification sent to "Navid.Afkhami@HIDDEN" <Navid.Afkhami@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Ludovic Courtès <ludo@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 78363-done <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#78363: [PATCH 3/3] environment: Make home writable.
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 (Tomas Volf's message of "Sun, 18 May 2025 15:39:36 +0200")
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Hello,

Tomas Volf <~@wolfsden.cz> writes:

> * guix/scripts/environment.scm (launch-environment/container): Add tmpfs =
for
> home.
> * tests/guix-environment-container.sh: Add test.
>
> Change-Id: Iadd9b838f6442a8080998ed7e07414db562068bf

I added a =E2=80=9CFixes=E2=80=9D line referencing the initial bug report a=
nd applied
all three patches.  Thanks!

  11e88de060 * environment: Make home writable.
  7a888d9841 * environment: Translate only file names under home directory.
  8654aecf74 * environment: Use inherit for new mapping.

Ludo=E2=80=99.
Notification sent to keinflue <keinflue@HIDDEN>:
bug acknowledged by developer. Full text available.
Reply sent to Ludovic Courtès <ludo@HIDDEN>:
You have taken responsibility. Full text available.
Merged 78363 78440. Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <875xi0qru6.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Fri, 16 May 2025 21:27:13 +0200")
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--=-=-=
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Hi Ludo',

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Tomas Volf <~@wolfsden.cz> writes:
>
>> Yeah, I agree.  I can try to produce a patch (I should have some time on
>> Sunday), but obviously anyone feel free to step in.
>
> Wonderful, thanks.  :-)

I have sent a couple of patches to this issue.  It is 3 part series,
each patch is independent though.  First is just a simplification,
second fixes unrelated bug, and third makes home writable.  I can send
the first two as separate issues if your would prefer.

Anyway, let me know what you think.

Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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--=-=-=--
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

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From: Tomas Volf <~@wolfsden.cz>
To: 78363 <at> debbugs.gnu.org
Subject: [PATCH 3/3] environment: Make home writable.
Date: Sun, 18 May 2025 15:39:36 +0200
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* guix/scripts/environment.scm (launch-environment/container): Add tmpfs for
home.
* tests/guix-environment-container.sh: Add test.

Change-Id: Iadd9b838f6442a8080998ed7e07414db562068bf
---
 guix/scripts/environment.scm        | 9 ++++++++-
 tests/guix-environment-container.sh | 4 ++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index bc06e97d7b..96bbc6c9fa 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -874,7 +874,14 @@ (define* (launch-environment/container #:key command bash user user-mappings
                       (writable? #f)))
                    reqs)))
             (file-systems (append %container-file-systems
-                                  (list tmpfs)
+                                  (list tmpfs        ; RW /tmp
+                                        (file-system ; RW ~
+                                          (device "none")
+                                          (mount-point
+                                           (or (and=> user user-override-home)
+                                               home))
+                                          (type "tmpfs")
+                                          (check? #f)))
                                   (if network?
                                       (filter-map optional-mapping->fs
                                                   %network-file-mappings)
diff --git a/tests/guix-environment-container.sh b/tests/guix-environment-container.sh
index d0f19c8372..e1c3655846 100644
--- a/tests/guix-environment-container.sh
+++ b/tests/guix-environment-container.sh
@@ -199,6 +199,10 @@ guix environment --bootstrap --container --ad-hoc guile-bootstrap	\
 guix environment --bootstrap --container --ad-hoc guile-bootstrap \
      -- guile -c '(mkdir "/tmp/foo")'
 
+# And so is ~.
+guix environment --bootstrap --container --ad-hoc guile-bootstrap \
+     -- guile -c '(mkdir (string-append (getenv "HOME") "/foo"))'
+
 
 # Check the exit code.
 
-- 
2.49.0
Information forwarded to guix@HIDDEN, dev@HIDDEN, ludo@HIDDEN, othacehe@HIDDEN, zimon.toutoune@HIDDEN, me@HIDDEN, bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: 78363 <at> debbugs.gnu.org
Subject: [PATCH 1/3] environment: Use inherit for new mapping.
Date: Sun, 18 May 2025 15:39:34 +0200
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* guix/scripts/environment.scm (override-user-mappings): Use inherit.

Change-Id: Iadd9b838f6442a8080998ed7e07414db562068bf
---
 guix/scripts/environment.scm | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index 7103fdaf20..3c66906793 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -989,9 +989,8 @@ (define (override-user-mappings user home mappings)
              (let ((target (file-system-mapping-target mapping)))
                (if (string-prefix? home target)
                    (file-system-mapping
-                    (source    (file-system-mapping-source mapping))
-                    (target    (override-user-dir user home target))
-                    (writable? (file-system-mapping-writable? mapping)))
+                    (inherit mapping)
+                    (target (override-user-dir user home target)))
                    mapping)))
            mappings)))
 
-- 
2.49.0
Information forwarded to guix@HIDDEN, dev@HIDDEN, ludo@HIDDEN, othacehe@HIDDEN, zimon.toutoune@HIDDEN, me@HIDDEN, bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: 78363 <at> debbugs.gnu.org
Subject: [PATCH 2/3] environment: Translate only file names under home
 directory.
Date: Sun, 18 May 2025 15:39:35 +0200
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* guix/scripts/environment.scm (file-name-equal-or-under?): New procedure.
(override-user-mappings, override-user-dir): Use it.

Change-Id: Iadd9b838f6442a8080998ed7e07414db562068bf
---
 guix/scripts/environment.scm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index 3c66906793..bc06e97d7b 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -979,6 +979,12 @@ (define (user-override-home user)
   "Return home directory for override user USER."
   (string-append "/home/" user))
 
+(define (file-name-equal-or-under? file-name directory)
+  "Is @var{file-name} equal to or under @var{directory}?"
+  (or (string=? directory file-name)
+      (and (string-prefix? directory file-name)
+           (char=? #\/ (string-ref file-name (string-length directory))))))
+
 (define (override-user-mappings user home mappings)
   "If a username USER is provided, rewrite each HOME prefix in file system
 mappings MAPPINGS to a home directory determined by 'override-user-dir';
@@ -987,7 +993,7 @@ (define (override-user-mappings user home mappings)
       mappings
       (map (lambda (mapping)
              (let ((target (file-system-mapping-target mapping)))
-               (if (string-prefix? home target)
+               (if (file-name-equal-or-under? target home)
                    (file-system-mapping
                     (inherit mapping)
                     (target (override-user-dir user home target)))
@@ -997,7 +1003,7 @@ (define (override-user-mappings user home mappings)
 (define (override-user-dir user home dir)
   "If username USER is provided, overwrite string prefix HOME in DIR with a
 directory determined by 'user-override-home'; otherwise, return DIR."
-  (if (and user (string-prefix? home dir))
+  (if (and user (file-name-equal-or-under? dir home))
       (string-append (user-override-home user)
                      (substring dir (string-length home)))
       dir))
-- 
2.49.0
Information forwarded to guix@HIDDEN, dev@HIDDEN, ludo@HIDDEN, othacehe@HIDDEN, zimon.toutoune@HIDDEN, me@HIDDEN, bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#78363: Home is read-only in guix shell container
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Tomas Volf <~@wolfsden.cz> writes:

> Yeah, I agree.  I can try to produce a patch (I should have some time on
> Sunday), but obviously anyone feel free to step in.

Wonderful, thanks.  :-)

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

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From: Tomas Volf <~@wolfsden.cz>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <87jz6jyx4x.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

>>> As noted in the =E2=80=98guix pull=E2=80=99 news, you can use =E2=80=98=
--writable-root=E2=80=99.
>>> Otherwise, everything but the current directory and /tmp is read-only.
>>
>> Does that make sense though?  You have already made an exception for
>> /tmp, I would argue that ~ is another candidate for special-casing.
>>
>> I think people would reasonably expect that touching a file in your own
>> home should work.  But it does not:
>>
>> $ guix shell --no-cwd -C coreutils bash -- sh -c 'touch ~/foo'
>> touch: cannot touch '/home/user/foo': Read-only file system
>>
>>
>> Some software just fails to start in the container:
>>
>> $ guix shell --no-cwd -C deluge -- deluged
>> 20:22:20 [ERROR   ][deluge.common:136 ] Unable to use default config dir=
ectory, exiting... ([Errno 30] Read-only file system: '/home/user/.config')
>
> It=E2=80=99s surprising that deluged tries to write to ~/.config,

In absence of the configuration, it generates default one and stores it
into the ~/.config/deluge.  This behavior is sensible for this specific
program.

> but yeah, more generally, I agree that many programs will want to
> write to ~/.cache and the likes.
>
> So hmm, maybe we can make another exception?  It doesn=E2=80=99t hurt any=
way
> since it=E2=80=99s a tmpfs.

Yeah, I agree.  I can try to produce a patch (I should have some time on
Sunday), but obviously anyone feel free to step in.

Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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--=-=-=--
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <87msbivqqj.fsf@HIDDEN> (Tomas Volf's message of "Sun, 11
 May 2025 22:26:12 +0200")
References: <df56dcfd7fd78f50fe83429db976dc30@HIDDEN>
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Hello,

Tomas Volf <~@wolfsden.cz> writes:

>> As noted in the =E2=80=98guix pull=E2=80=99 news, you can use =E2=80=98-=
-writable-root=E2=80=99.
>> Otherwise, everything but the current directory and /tmp is read-only.
>
> Does that make sense though?  You have already made an exception for
> /tmp, I would argue that ~ is another candidate for special-casing.
>
> I think people would reasonably expect that touching a file in your own
> home should work.  But it does not:
>
> $ guix shell --no-cwd -C coreutils bash -- sh -c 'touch ~/foo'
> touch: cannot touch '/home/user/foo': Read-only file system
>
>
> Some software just fails to start in the container:
>
> $ guix shell --no-cwd -C deluge -- deluged
> 20:22:20 [ERROR   ][deluge.common:136 ] Unable to use default config dire=
ctory, exiting... ([Errno 30] Read-only file system: '/home/user/.config')

It=E2=80=99s surprising that deluged tries to write to ~/.config, but yeah,=
 more
generally, I agree that many programs will want to write to ~/.cache and
the likes.

So hmm, maybe we can make another exception?  It doesn=E2=80=99t hurt anyway
since it=E2=80=99s a tmpfs.

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <87bjrz2nlg.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Sun, 11 May 2025 17:06:51 +0200")
References: <df56dcfd7fd78f50fe83429db976dc30@HIDDEN>
 <87bjrz2nlg.fsf@HIDDEN>
Date: Sun, 11 May 2025 22:26:12 +0200
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> keinflue <keinflue@HIDDEN> writes:
>
>> I am not sure whether this is intended behavior, but it seems weird to
>> me. Inside e.g.
>>
>> guix shell -Cu test coreutils
>>
>> /home/test is mounted read-only and I do not see any way to make it
>> writable without sharing a host directory.
>
> As noted in the =E2=80=98guix pull=E2=80=99 news, you can use =E2=80=98--=
writable-root=E2=80=99.
> Otherwise, everything but the current directory and /tmp is read-only.

Does that make sense though?  You have already made an exception for
/tmp, I would argue that ~ is another candidate for special-casing.

I think people would reasonably expect that touching a file in your own
home should work.  But it does not:

--8<---------------cut here---------------start------------->8---
$ guix shell --no-cwd -C coreutils bash -- sh -c 'touch ~/foo'
touch: cannot touch '/home/user/foo': Read-only file system
--8<---------------cut here---------------end--------------->8---

Some software just fails to start in the container:

--8<---------------cut here---------------start------------->8---
$ guix shell --no-cwd -C deluge -- deluged
20:22:20 [ERROR   ][deluge.common:136 ] Unable to use default config direct=
ory, exiting... ([Errno 30] Read-only file system: '/home/user/.config')
--8<---------------cut here---------------end--------------->8---

Sure, I *can* use --writable-root, but I agree that root being read-only
is a good idea.  Maybe --writable-home, which would default to #t, would
be a good addition?

Tomas

--=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: keinflue <keinflue@HIDDEN>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <df56dcfd7fd78f50fe83429db976dc30@HIDDEN>
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Hi,

keinflue <keinflue@HIDDEN> writes:

> I am not sure whether this is intended behavior, but it seems weird to
> me. Inside e.g.
>
> guix shell -Cu test coreutils
>
> /home/test is mounted read-only and I do not see any way to make it
> writable without sharing a host directory.

As noted in the =E2=80=98guix pull=E2=80=99 news, you can use =E2=80=98--wr=
itable-root=E2=80=99.
Otherwise, everything but the current directory and /tmp is read-only.

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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From: Z572 <zhengjunjie@HIDDEN>
To: Rutherther via Bug reports for GNU Guix <bug-guix@HIDDEN>
Subject: Re: bug#78363: Home is read-only in guix shell container
In-Reply-To: <875xi7gynj.fsf@HIDDEN> (Rutherther via Bug reports for's
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

Rutherther via Bug reports for GNU Guix <bug-guix@HIDDEN> writes:

>> I am not sure whether this is intended behavior, but it seems weird to=20
>> me. Inside e.g.
>>=20
>> guix shell -Cu test coreutils
>>=20
>> /home/test is mounted read-only and I do not see any way to make it=20
>> writable without sharing a host directory.
>
> Yes this is intentional. The root has been changed to read only
> recently. See the guix news. Use --writable-root to restore the previous =
behavior.

I think this is a bug, just like issues.guix.gnu.org/78272

--=-=-=
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Oh ok, if that is intentionally including the home directory, then 
everything is ok. I missed the --writable-root option when reading the 
man page.

This can be closed then.

On 11.05.2025 13:44, Rutherther wrote:
>> I am not sure whether this is intended behavior, but it seems weird to
>> me. Inside e.g.
>> 
>> guix shell -Cu test coreutils
>> 
>> /home/test is mounted read-only and I do not see any way to make it
>> writable without sharing a host directory.
> 
> Yes this is intentional. The root has been changed to read only
> recently. See the guix news. Use --writable-root to restore the
> previous behavior.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

Message received at 78363 <at> debbugs.gnu.org:


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Subject: Re: Home is read-only in guix shell container
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 Content preview:  > I am not sure whether this is intended behavior, but it
 seems weird to > me. Inside e.g. > > guix shell -Cu test coreutils > >
 /home/test
 is mounted read-only and I do not see any way to make it > w [...] 
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 Content preview:  > I am not sure whether this is intended behavior, but it
   seems weird to > me. Inside e.g. > > guix shell -Cu test coreutils > > /home/test
    is mounted read-only and I do not see any way to make it > w [...] 
 
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> I am not sure whether this is intended behavior, but it seems weird to 
> me. Inside e.g.
> 
> guix shell -Cu test coreutils
> 
> /home/test is mounted read-only and I do not see any way to make it 
> writable without sharing a host directory.

Yes this is intentional. The root has been changed to read only
recently. See the guix news. Use --writable-root to restore the previous behavior.
Information forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.

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


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I am not sure whether this is intended behavior, but it seems weird to 
me. Inside e.g.

guix shell -Cu test coreutils

/home/test is mounted read-only and I do not see any way to make it 
writable without sharing a host directory.
Acknowledgement sent to keinflue <keinflue@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#78363; Package guix. Full text available.
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