[packages/coreutils] upstream fix for tail regression with big -n

[atler]

commit ee87a248bcf3d3aa091c103499d296d83b91f13e
Author: Jan Palus <atler at pld-linux.org>
Date:   Thu Sep 25 17:08:22 2025 +0200

    upstream fix for tail regression with big -n
    
    thanks Pádraig Brady for notification

 coreutils.spec      |  2 ++
 tail-large-nr.patch | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
---
diff --git a/coreutils.spec b/coreutils.spec
index 8543202..8ec8fb8 100644
--- a/coreutils.spec
+++ b/coreutils.spec
@@ -33,6 +33,7 @@ Patch7:		%{name}-sparc64.patch
 Patch9:		%{name}-advcopy.patch
 Patch10:	tests.patch
 Patch11:	link.patch
+Patch12:	tail-large-nr.patch
 URL:		http://www.gnu.org/software/coreutils/
 BuildRequires:	acl-devel
 BuildRequires:	attr-devel
@@ -123,6 +124,7 @@ Programy zawarte w tym pakiecie to:
 %endif
 %patch -P10 -p1
 %patch -P11 -p1
+%patch -P12 -p1
 
 %{__mv} man/pt_BR man/pt
 
diff --git a/tail-large-nr.patch b/tail-large-nr.patch
new file mode 100644
index 0000000..daf1ffa
--- /dev/null
+++ b/tail-large-nr.patch
@@ -0,0 +1,79 @@
+From 914972e80dbf82aac9ffe3ff1f67f1028e1a788b Mon Sep 17 00:00:00 2001
+From: Hannes Braun <hannes at hannesbraun.net>
+Date: Wed, 24 Sep 2025 21:20:49 +0200
+Subject: [PATCH] tail: fix tailing larger number of lines in regular files
+
+* src/tail.c (file_lines): Seek to the previous block instead of the
+beginning (or a little before) of the block that was just scanned.
+Otherwise, the same block is read and scanned (at least partially)
+again. This bug was introduced by commit v9.7-219-g976f8abc1.
+* tests/tail/basic-seek.sh: Add a new test.
+* tests/local.mk: Reference the new test.
+* NEWS: mention the bug fix.
+---
+ NEWS                     |  4 ++++
+ src/tail.c               |  2 +-
+ tests/local.mk           |  1 +
+ tests/tail/basic-seek.sh | 28 ++++++++++++++++++++++++++++
+ 4 files changed, 34 insertions(+), 1 deletion(-)
+ create mode 100755 tests/tail/basic-seek.sh
+
+diff --git a/src/tail.c b/src/tail.c
+index b8bef1d91c..c7779c77df 100644
+--- a/src/tail.c
++++ b/src/tail.c
+@@ -596,7 +596,7 @@ file_lines (char const *prettyname, int fd, struct stat const *sb,
+           goto free_buffer;
+         }
+ 
+-      pos = xlseek (fd, -bufsize, SEEK_CUR, prettyname);
++      pos = xlseek (fd, -(bufsize + bytes_read), SEEK_CUR, prettyname);
+       bytes_read = read (fd, buffer, bufsize);
+       if (bytes_read < 0)
+         {
+diff --git a/tests/local.mk b/tests/local.mk
+index ff5727f745..9663ee2da1 100644
+--- a/tests/local.mk
++++ b/tests/local.mk
+@@ -179,6 +179,7 @@ all_tests =					\
+   tests/cp/no-ctx.sh				\
+   tests/misc/read-errors.sh			\
+   tests/misc/write-errors.sh			\
++  tests/tail/basic-seek.sh			\
+   tests/tail/inotify-hash-abuse.sh		\
+   tests/tail/inotify-hash-abuse2.sh		\
+   tests/tail/F-vs-missing.sh			\
+diff --git a/tests/tail/basic-seek.sh b/tests/tail/basic-seek.sh
+new file mode 100755
+index 0000000000..307ed667ea
+--- /dev/null
++++ b/tests/tail/basic-seek.sh
+@@ -0,0 +1,28 @@
++#!/bin/sh
++# Verify that tail works when seeking within a file
++
++# Copyright (C) 2025 Free Software Foundation, Inc.
++
++# This program is free software: you can redistribute it and/or modify
++# it under the terms of the GNU General Public License as published by
++# the Free Software Foundation, either version 3 of the License, or
++# (at your option) any later version.
++
++# This program is distributed in the hope that it will be useful,
++# but WITHOUT ANY WARRANTY; without even the implied warranty of
++# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++# GNU General Public License for more details.
++
++# You should have received a copy of the GNU General Public License
++# along with this program.  If not, see <https://www.gnu.org/licenses/>.
++
++. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
++print_ver_ tail
++
++yes '=================================' |
++  head -n1K > file.in || framework_failure_
++
++# This returned 139 in coreutils v9.8
++test $(tail -n200 file.in | wc -l) = 200 || fail=1
++
++Exit $fail
================================================================

---- gitweb:

http://git.pld-linux.org/gitweb.cgi/packages/coreutils.git/commitdiff/ee87a248bcf3d3aa091c103499d296d83b91f13e