fix a regression, cmp-s returns 1 even if files are identical

diffutils-3.10-cmp-s-empty.patch

@@ -0,0 +1,19 @@
+diff -up diffutils-3.10/src/cmp.c.orig diffutils-3.10/src/cmp.c
+--- diffutils-3.10/src/cmp.c.orig	2024-07-23 12:27:16.243455513 +0200
++++ diffutils-3.10/src/cmp.c	2024-07-23 12:31:55.560196269 +0200
+@@ -343,12 +343,13 @@ main (int argc, char **argv)
+ 
+   /* If only a return code is needed,
+      and if both input descriptors are associated with plain files,
++     and if both files are larger than 0 bytes (procfs files are always 0),
+      conclude that the files differ if they have different sizes
+      and if more bytes will be compared than are in the smaller file.  */
+ 
+   if (comparison_type == type_status
+-      && 0 <= stat_buf[0].st_size && S_ISREG (stat_buf[0].st_mode)
+-      && 0 <= stat_buf[1].st_size && S_ISREG (stat_buf[1].st_mode))
++      && 0 < stat_buf[0].st_size && S_ISREG (stat_buf[0].st_mode)
++      && 0 < stat_buf[1].st_size && S_ISREG (stat_buf[1].st_mode))
+     {
+       off_t s0 = stat_buf[0].st_size - file_position (0);
+       off_t s1 = stat_buf[1].st_size - file_position (1);

diffutils.spec

@@ -1,11 +1,13 @@
 Summary: GNU collection of diff utilities
 Name: diffutils
 Version: 3.10
-Release: 6%{?dist}
+Release: 7%{?dist}
 URL: https://www.gnu.org/software/diffutils/diffutils.html
 Source: https://ftp.gnu.org/gnu/diffutils/diffutils-%{version}.tar.xz
+# Multibyte
 Patch0: diffutils-i18n.patch
 Patch1: 0001-diff-Fix-output-of-diff-l-y-for-non-ASCII-input-file.patch
+Patch2: diffutils-3.10-cmp-s-empty.patch
 License: GPL-3.0-or-later
 Provides: bundled(gnulib)
 BuildRequires: gcc
@@ -27,10 +29,7 @@ to merge two files interactively.
 Install diffutils if you need to compare text files.
 
 %prep
-%setup -q
-# Multibyte
-%patch -P0 -p1 -b .i18n
-%patch -P1 -p1 -b .fix-output-of-diff-l-y-for-non-ASCII-input-file
+%autosetup -p1
 
 # Run autoreconf for aarch64 support (bug #925256).
 autoreconf
@@ -58,6 +57,9 @@ make check
 %{_infodir}/diffutils.info*
 
 %changelog
+* Tue Jul 23 2024 Than Ngo <than@redhat.com> - 3.10-7
+- fix a regression, cmp-s returns 1 even if files are identical
+
 * Wed Jul 17 2024 Fedora Release Engineering <releng@fedoraproject.org> - 3.10-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild