avoid sticky problem with '-f - -f -'

backport-grep-avoid-sticky-problem-with-f-f.patch

@@ -0,0 +1,56 @@
+From ad6de316cca655cd8b0b20b3e9dd18e7e98e443a Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Sat, 21 Aug 2021 10:44:17 -0700
+Subject: [PATCH] =?UTF-8?q?grep:=20avoid=20sticky=20problem=20with?=
+ =?UTF-8?q?=20=E2=80=98-f=20-=20-f=20-=E2=80=99?=
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Inspired by bug#50129 even though this is a different bug.
+* src/grep.c (main): For ‘-f -’, use clearerr (stdin) after
+reading, so that ‘grep -f - -f -’ reads stdin twice even
+when stdin is a tty.  Also, for ‘-f FILE’, report any
+I/O error when closing FILE.
+---
+ src/grep.c | 17 +++++++++++------
+ 1 file changed, 11 insertions(+), 6 deletions(-)
+
+diff --git a/src/grep.c b/src/grep.c
+index 7a33686..b2a0566 100644
+--- a/src/grep.c
++++ b/src/grep.c
+@@ -2477,7 +2477,6 @@ main (int argc, char **argv)
+   int matcher = -1;
+   int opt;
+   int prev_optind, last_recursive;
+-  int fread_errno;
+   intmax_t default_context;
+   FILE *fp;
+   exit_failure = EXIT_TROUBLE;
+@@ -2648,11 +2647,17 @@ main (int argc, char **argv)
+               if (cc == 0)
+                 break;
+             }
+-          fread_errno = errno;
+-          if (ferror (fp))
+-            die (EXIT_TROUBLE, fread_errno, "%s", optarg);
+-          if (fp != stdin)
+-            fclose (fp);
++          int err = errno;
++          if (!ferror (fp))
++            {
++              err = 0;
++              if (fp == stdin)
++                clearerr (fp);
++              else if (fclose (fp) != 0)
++                err = errno;
++            }
++          if (err)
++            die (EXIT_TROUBLE, err, "%s", optarg);
+           /* Append final newline if file ended in non-newline. */
+           if (newkeycc != keycc && keys[newkeycc - 1] != '\n')
+             keys[newkeycc++] = '\n';
+-- 
+1.8.3.1
+

grep.spec

@@ -1,11 +1,13 @@
 Name:    grep
 Version: 3.7
-Release: 1
+Release: 2
 Summary: A string search utility
 License: GPLv3+
 URL: http://www.gnu.org/software/grep/
 Source0: https://ftp.gnu.org/gnu/grep/grep-%{version}.tar.xz
 
+Patch1: backport-grep-avoid-sticky-problem-with-f-f.patch
+
 BuildRequires: gcc pcre-devel >= 3.9-10 texinfo gettext libsigsegv-devel automake
 Provides: /bin/egrep /bin/fgrep /bin/grep bundled(gnulib)
 
@@ -44,6 +46,9 @@ make check
 
 
 %changelog
+* Tue Feb 8 2022 yangzhuangzhuang <yangzhuangzhuang1@h-partners.com> - 3.7-2
+- avoid sticky problem with '-f - -f -'
+
 * Wed Dec 29 2021 yangzhuangzhuang <yangzhuangzhuang1@huawei.com> - 3.7-1
 - update version to 3.7