X-Loop: help-debbugs@HIDDEN
Subject: bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty
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From: Kate Deplaix <kit-ty-kate@HIDDEN>
Thread-Topic: 3.11 critical bug: diff -Naur a b does not show a unified diff
when one of the file is empty
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Date: Thu, 20 Feb 2025 15:25:05 +0000
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Subject: bug#76452: [bug-diffutils] bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty
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From: Collin Funk <collin.funk1@HIDDEN>
In-Reply-To: <CWLP265MB4157FEE87F56A0B0234CDF2CBCC42@HIDDEN>
(Kate Deplaix's message of "Thu, 20 Feb 2025 15:25:05 +0000")
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Date: Thu, 20 Feb 2025 22:10:44 -0800
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--=-=-=
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Hi Katie,
Kate Deplaix <kit-ty-kate@HIDDEN> writes:
> With diffutils 3.10, "diff -Naur a b" returns:
>
> diff -Naur a/test b/test
> --- a/test=E2=80=82=E2=80=82=E2=80=822025-02-20 14:50:07.870258052 +0000
> +++ b/test=E2=80=82=E2=80=82=E2=80=822025-02-20 14:50:18.957287641 +0000
> @@ -0,0 +1 @@
> +content
>
> but with diffutils 3.11, the same command returns:
>
> File a/test is a regular empty file while file b/test is a regular file
Good catch.
CC'ing Paul Eggert since I think that I found the cause and it appears
unintentional to me.
Commit e016d12581ac4ea6be1ded88279527ceface74e1 has the following
ChangeLog:
diff: improve symlink handling, avoiding a race
[...]
(compare_prepped_files): Use filetype and stat macros, not detype.
[...]
Where filetype refers to a constant string returned by Gnulib's
c_file_type function. The relevant lines are here:
if (S_ISREG (st->st_mode))
return st->st_size =3D=3D 0 ? N_("regular empty file") : N_("regular fi=
le");
So empty files will be treated as different file types because of that
change.
I have attached a patch to check for this condition.
Collin
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
filename=0001-diff-don-t-treat-empty-files-as-a-different-file-typ.patch
From 7d4c55202ec4c0366062ff03d27a4883861ff222 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.funk1@HIDDEN>
Date: Thu, 20 Feb 2025 21:59:55 -0800
Subject: [PATCH] diff: don't treat empty files as a different file type
Reported by Kate Deplaix <kit-ty-kate@HIDDEN> in
<https://lists.gnu.org/r/bug-diffutils/2025-02/msg00005.html>.
* src/diff.c (compare_prepped_files): Check for two regular files where
one has a zero size and the other has a non-zero size.
---
src/diff.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/diff.c b/src/diff.c
index fa6100e..0c41fd2 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1226,7 +1226,10 @@ compare_prepped_files (struct comparison const *parent,
if (toplevel
? (!S_ISLNK (cmp->file[0].stat.st_mode)
!= !S_ISLNK (cmp->file[1].stat.st_mode))
- : (cmp->file[0].filetype != cmp->file[1].filetype
+ : ((cmp->file[0].filetype != cmp->file[1].filetype
+ && !(S_ISREG (cmp->file[0].stat.st_mode)
+ && S_ISREG (cmp->file[1].stat.st_mode)
+ && (!!cmp->file[0].stat.st_size == !!!cmp->file[1].stat.st_size)))
|| ! (S_ISREG (cmp->file[0].stat.st_mode)
|| S_ISLNK (cmp->file[0].stat.st_mode)
|| S_ISCHR (cmp->file[0].stat.st_mode)
--
2.48.1
--=-=-=--
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Subject: bug#76452: [bug-diffutils] bug#76452: bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty
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From: Collin Funk <collin.funk1@HIDDEN>
In-Reply-To: <87v7t3rfob.fsf@HIDDEN> (Collin Funk's message of "Thu, 20 Feb
2025 22:10:44 -0800")
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--=-=-=
Content-Type: text/plain
Collin Funk <collin.funk1@HIDDEN> writes:
> I have attached a patch to check for this condition.
Since it seems easy to overlook this in the future I have attached a
patch with the test case as well.
Collin
--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
filename=0001-diff-add-a-test-case-for-the-recent-empty-file-bug.patch
From 94fcd58f38beec6e591a86b67a57729951eaf108 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.funk1@HIDDEN>
Date: Thu, 20 Feb 2025 22:36:51 -0800
Subject: [PATCH] diff: add a test case for the recent empty file bug
* tests/empty-file: New file.
* tests/Makefile.am (TESTS): Add the test.
---
tests/Makefile.am | 1 +
tests/empty-file | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
create mode 100755 tests/empty-file
diff --git a/tests/Makefile.am b/tests/Makefile.am
index adbb10d..806cd3c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -9,6 +9,7 @@ TESTS = \
cmp \
colliding-file-names \
diff3 \
+ empty-file \
excess-slash \
expand-tabs \
help-version \
diff --git a/tests/empty-file b/tests/empty-file
new file mode 100755
index 0000000..842a099
--- /dev/null
+++ b/tests/empty-file
@@ -0,0 +1,23 @@
+#!/bin/sh
+# Test empty files
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+
+fail=0
+mkdir a b
+touch a/test
+echo 'content' > b/test
+
+returns_ 1 diff -Naur a b >out || fail=1
+cat <<EOF > expected || framework_failure_
+diff -Naur a/test b/test
+--- a/test
++++ b/test
+@@ -0,0 +1 @@
++content
+EOF
+# Remove date and time.
+sed -e 's/^\([-+*][-+*][-+*] [^ ]*\) .*/\1/' out > k; mv k out
+compare expected out || fail=1
+
+Exit $fail
--
2.48.1
--=-=-=--
X-Loop: help-debbugs@HIDDEN
Subject: bug#76452: [bug-diffutils] bug#76452: bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty
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On 2/20/25 23:39, Collin Funk wrote:
> Since it seems easy to overlook this in the future I have attached a
> patch with the test case as well.
Thanks, I installed that.
MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Paul Eggert <eggert@HIDDEN> Subject: bug#76452: closed (3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty) CC: tracker <at> debbugs.gnu.org Message-ID: <handler.76452.D76452.174020469628955.ackdone <at> debbugs.gnu.org> References: <27b53198-137f-4e37-8f99-b539e365d4ff@HIDDEN> <CWLP265MB4157FEE87F56A0B0234CDF2CBCC42@HIDDEN> X-Gnu-PR-Message: closed 76452 X-Gnu-PR-Package: diffutils Date: Sat, 22 Feb 2025 06:12:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1740204724-29208-0" This is a multi-part message in MIME format... ------------=_1740204724-29208-0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Your message dated Fri, 21 Feb 2025 23:11:22 -0700 with message-id <27b53198-137f-4e37-8f99-b539e365d4ff@HIDDEN> and subject line Re: [bug-diffutils] bug#76452: 3.11 critical bug: diff -Na= ur a b does not show a unified diff when one of the file is empty has caused the debbugs.gnu.org bug report #76452, regarding 3.11 critical bug: diff -Naur a b does not show a unified diff wh= en one of the file is empty to be marked as done. 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Thanks for the diagnosis and the patch. 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MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Kate Deplaix <kit-ty-kate@HIDDEN> Subject: bug#76452: closed (Re: [bug-diffutils] bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty) Message-ID: <handler.76452.D76452.174020469628955.notifdone <at> debbugs.gnu.org> References: <27b53198-137f-4e37-8f99-b539e365d4ff@HIDDEN> <CWLP265MB4157FEE87F56A0B0234CDF2CBCC42@HIDDEN> X-Gnu-PR-Message: they-closed 76452 X-Gnu-PR-Package: diffutils Reply-To: 76452 <at> debbugs.gnu.org Date: Sat, 22 Feb 2025 06:12:04 +0000 Content-Type: multipart/mixed; boundary="----------=_1740204724-29208-1" This is a multi-part message in MIME format... ------------=_1740204724-29208-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when= one of the file is empty which was filed against the diffutils package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 76452 <at> debbugs.gnu.org. --=20 76452: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76452 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems ------------=_1740204724-29208-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 76452-done) by debbugs.gnu.org; 22 Feb 2025 06:11:36 +0000 Received: from localhost ([127.0.0.1]:44476 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tlije-0007Wj-La for submit <at> debbugs.gnu.org; Sat, 22 Feb 2025 01:11:35 -0500 Received: from mail.cs.ucla.edu ([131.179.128.66]:39782) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1tlija-0007VN-LB for 76452-done <at> debbugs.gnu.org; Sat, 22 Feb 2025 01:11:31 -0500 Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 3E1603C011BD8; Fri, 21 Feb 2025 22:11:24 -0800 (PST) Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id xyXnPobyD5XO; Fri, 21 Feb 2025 22:11:23 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id BFECB3C011BDB; Fri, 21 Feb 2025 22:11:23 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu BFECB3C011BDB DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1740204683; bh=e1oWSJC0lldFTLVtjbEMQfNLWViJEEbqT9EIsgPpRhg=; h=Message-ID:Date:MIME-Version:To:From; b=PlJJSzS1iBL4XmaoqQkGS+/VtUICmE8laFZqef/YWS5tXNbEFMr32B++gk3wbbGye 5iVxds4piuHa+fmR0YFvTbQU6HhSvmprPfskxD09XSQFcD8FJrZWQpuvozsqcaNIQg 3Ws7DdqrVF/4KYiQqwCVrUpAXhe9xrdgHCuP1cm9frPeQici5lD5xNkfAe99fcRssl dS2t0iSrc0u3feZv97liHVP9JP8k13qUiz/UMa8xc8M9w+senBTGyUNiOSmdtW9VbC EBWtb9l+47+UuB5HHYK6ZlWwBFpL6aYi3VsBnnx9oo+j1vmjUd9TsD8LrPXfFgw6xh 3BpVDVfsG4b7A== X-Virus-Scanned: amavis at mail.cs.ucla.edu Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id KfPN8P_6GZnI; Fri, 21 Feb 2025 22:11:23 -0800 (PST) Received: from [192.168.0.23] (75-166-225-192.hlrn.qwest.net [75.166.225.192]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 64CB53C011BD8; Fri, 21 Feb 2025 22:11:23 -0800 (PST) Content-Type: multipart/mixed; boundary="------------tf7XxNw2LCKKFhThYFPCHdMx" Message-ID: <27b53198-137f-4e37-8f99-b539e365d4ff@HIDDEN> Date: Fri, 21 Feb 2025 23:11:22 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [bug-diffutils] bug#76452: 3.11 critical bug: diff -Naur a b does not show a unified diff when one of the file is empty To: Collin Funk <collin.funk1@HIDDEN> References: <CWLP265MB4157FEE87F56A0B0234CDF2CBCC42@HIDDEN> <87v7t3rfob.fsf@HIDDEN> Content-Language: en-US From: Paul Eggert <eggert@HIDDEN> In-Reply-To: <87v7t3rfob.fsf@HIDDEN> X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 76452-done Cc: 76452-done <at> debbugs.gnu.org, Kate Deplaix <kit-ty-kate@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) This is a multi-part message in MIME format. --------------tf7XxNw2LCKKFhThYFPCHdMx Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Thanks for the diagnosis and the patch. 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