GNU logs - #79582, boring messages

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Subject: bug#79582: archive-mode: opening squashfs nested in zip file doesn't work
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--=-=-=
Content-Type: text/plain

Hi,

Maybe not really an important bug, but during testing for #79574 I found
it:

opening a squashfs file nested in a zip file produces an "File mode
specification error".

(note: opening zip in zip works, which is really nice - gvfs => tramp
afaiu doesn't support that)

Howto reproduce:

I used a debian/sid chroot to test:

$ sudo apt-get -y install emacs-nox squashfs-tools squashfs-tools-ng zip
$ cd /tmp/ ; rm -rf s; mkdir s; cd s; echo hello world > hello;
$ mksquashfs hello test.squashfs;
# this works as expected:
$ emacs -nw test.squashfs
# create zip containing squashfs
$ mkdir z; pushd z; cp ../test.squashfs .; zip -r ../test.zip .; popd
$ emacs -nw test.zip
# now try to open the test.squashfs within the test.zip

I get:

"File mode specification error: (search-failed [drwxl\-]\{10\})"

attached the test.zip

Best regards
Jens


--=-=-=
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--=-=-=--

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Jens Thiele <karme@HIDDEN>
Subject: bug#79582: Acknowledgement (archive-mode: opening squashfs nested
 in zip file doesn't work)
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References: <87ikgsh5x2.fsf@HIDDEN>
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Date: Mon, 06 Oct 2025 07:00:04 +0000

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Subject: bug#79582: archive-mode: opening squashfs nested in zip file doesn't work
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Jens Thiele <karme@HIDDEN> writes:

> Hi,

Hi Jens,

> (note: opening zip in zip works, which is really nice - gvfs => tramp
> afaiu doesn't support that)

Thanks for the heads-up! It ought to work until Emacs 27 (Tramp 2.4),
but it is lost now. I'll check what's up.

> Best regards
> Jens

Best regards, Michael.

Message sent to bug-gnu-emacs@HIDDEN:


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Michael Albinus <michael.albinus@HIDDEN> writes:

>> Hi,

Hi Jens,

>> (note: opening zip in zip works, which is really nice - gvfs => tramp
>> afaiu doesn't support that)
>
> Thanks for the heads-up! It ought to work until Emacs 27 (Tramp 2.4),
> but it is lost now. I'll check what's up.

I've fixed this in tramp-archive.el. If you have, for example, a zip
file outer.zip, which contains another inner.zip, which contains a file
foo, you can access it via outer.zip/inner.zip/foo .

Pushed to the repositories.

For the cascade zip => squashfs I cannot help. libarchive, the working
horse of tramp-archive.el, doesn't support squashfs. See
<https://github.com/libarchive/libarchive/issues/792>.

>> Best regards
>> Jens

Best regards, Michael.

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Michael Albinus <michael.albinus@HIDDEN> writes:

> Michael Albinus <michael.albinus@HIDDEN> writes:
>
>>> Hi,
>
> Hi Jens,

Hi,

>>> (note: opening zip in zip works, which is really nice - gvfs => tramp
>>> afaiu doesn't support that)
>>
>> Thanks for the heads-up! It ought to work until Emacs 27 (Tramp 2.4),
>> but it is lost now. I'll check what's up.
>
> I've fixed this in tramp-archive.el. If you have, for example, a zip
> file outer.zip, which contains another inner.zip, which contains a file
> foo, you can access it via outer.zip/inner.zip/foo .

cool - I didn't expect tramp would be able to do this.
Thanks for looking into this!

> Pushed to the repositories.

still pulling...
(somehow vcs2.savannah.gnu.org is slow?)

> For the cascade zip => squashfs I cannot help. libarchive, the working
> horse of tramp-archive.el, doesn't support squashfs. See
> <https://github.com/libarchive/libarchive/issues/792>.
>
>>> Best regards
>>> Jens
>
> Best regards, Michael.

Thanks
Jens

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> From: Jens Thiele <karme@HIDDEN>
> Date: Mon, 06 Oct 2025 08:59:21 +0200
> 
> Maybe not really an important bug, but during testing for #79574 I found
> it:
> 
> opening a squashfs file nested in a zip file produces an "File mode
> specification error".
> 
> (note: opening zip in zip works, which is really nice - gvfs => tramp
> afaiu doesn't support that)
> 
> Howto reproduce:
> 
> I used a debian/sid chroot to test:
> 
> $ sudo apt-get -y install emacs-nox squashfs-tools squashfs-tools-ng zip
> $ cd /tmp/ ; rm -rf s; mkdir s; cd s; echo hello world > hello;
> $ mksquashfs hello test.squashfs;
> # this works as expected:
> $ emacs -nw test.squashfs
> # create zip containing squashfs
> $ mkdir z; pushd z; cp ../test.squashfs .; zip -r ../test.zip .; popd
> $ emacs -nw test.zip
> # now try to open the test.squashfs within the test.zip
> 
> I get:
> 
> "File mode specification error: (search-failed [drwxl\-]\{10\})"
> 
> attached the test.zip

Thanks for the recipe and the test file.  Does the patch below fix it,
and if so, are there any left-overs after applying it?

diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 66cb89c3342..8957c4d2c15 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -2454,6 +2454,18 @@ archive-squashfs-summarize
     (setq file buffer-file-name))
   (let ((copy (file-local-copy file))
         (files ()))
+    ;; Similar to 'archive-maybe-copy'.
+    (unless (or (and copy (null file))
+                (file-readable-p file))
+      (setq archive-local-name
+            (archive-unique-fname (or file copy (buffer-name))
+                                  archive-tmpdir)
+            file archive-local-name)
+      (save-restriction
+        (widen)
+        (let ((coding-system-for-write 'no-conversion))
+          (write-region (point-min) (point-max)
+                        archive-local-name nil 'nomessage))))
     (with-temp-buffer
       (call-process "unsquashfs" nil t nil "-ll" (or file copy))
       (when copy

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Eli Zaretskii <eliz@HIDDEN> writes:

> Does the patch below fix it

I only did a quick test monkey patching my old emacs, but this works.

> if so, are there any left-overs after applying it?

There remains a temporary file "test.zip:test.squashfs".
But I really should test with current master.

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Jens Thiele <karme@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> writes:
>
>> Does the patch below fix it
>
> I only did a quick test monkey patching my old emacs, but this works.
>
>> if so, are there any left-overs after applying it?
>
> There remains a temporary file "test.zip:test.squashfs".
> But I really should test with current master.

with current master there remains:

$ ls -l /tmp/archive.tmpajjwyy/tmp/test.zip\:test.squashfs 
-rw-rw-r-- 1 karme karme 4096 12. Okt 11:13 /tmp/archive.tmpajjwyy/tmp/test.zip:test.squashfs

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Date: Sun, 12 Oct 2025 13:32:02 +0300
Message-Id: <86o6qc4di5.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <87ldlgxyz7.fsf@HIDDEN> (message from Jens Thiele on Sun, 12
 Oct 2025 11:15:24 +0200)
References: <87ikgsh5x2.fsf@HIDDEN> <86sefo4k17.fsf@HIDDEN>
 <87o6qczeb6.fsf@HIDDEN> <87ldlgxyz7.fsf@HIDDEN>
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> From: Jens Thiele <karme@HIDDEN>
> Cc: 79582 <at> debbugs.gnu.org
> Date: Sun, 12 Oct 2025 11:15:24 +0200
> 
> Jens Thiele <karme@HIDDEN> writes:
> 
> > Eli Zaretskii <eliz@HIDDEN> writes:
> >
> >> Does the patch below fix it
> >
> > I only did a quick test monkey patching my old emacs, but this works.
> >
> >> if so, are there any left-overs after applying it?
> >
> > There remains a temporary file "test.zip:test.squashfs".
> > But I really should test with current master.
> 
> with current master there remains:
> 
> $ ls -l /tmp/archive.tmpajjwyy/tmp/test.zip\:test.squashfs 
> -rw-rw-r-- 1 karme karme 4096 12. Okt 11:13 /tmp/archive.tmpajjwyy/tmp/test.zip:test.squashfs

Does the below fix it?

diff --git a/lisp/arc-mode.el b/lisp/arc-mode.el
index 66cb89c3342..3cd88dc0c9b 100644
--- a/lisp/arc-mode.el
+++ b/lisp/arc-mode.el
@@ -1012,7 +1012,7 @@ archive-delete-local
     (while again
       (setq name (directory-file-name (file-name-directory name)))
       (condition-case nil
-	  (delete-directory name)
+	  (delete-directory name t)
 	(error nil))
       (if (string= name top) (setq again nil)))))
 ;; -------------------------------------------------------------------------
@@ -2454,6 +2454,18 @@ archive-squashfs-summarize
     (setq file buffer-file-name))
   (let ((copy (file-local-copy file))
         (files ()))
+    ;; Similar to 'archive-maybe-copy'.
+    (unless (or (and copy (null file))
+                (file-readable-p file))
+      (setq archive-local-name
+            (archive-unique-fname (or file copy (buffer-name))
+                                  archive-tmpdir)
+            file archive-local-name)
+      (save-restriction
+        (widen)
+        (let ((coding-system-for-write 'no-conversion))
+          (write-region (point-min) (point-max)
+                        archive-local-name nil 'nomessage))))
     (with-temp-buffer
       (call-process "unsquashfs" nil t nil "-ll" (or file copy))
       (when copy
Last modified: Sun, 12 Oct 2025 10:45:01 UTC

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