Minor fix in the compatibility library.

Signed-off-by: wangzhiqiang <wangzhiqiang95@huawei.com>
(cherry picked from commit 3715862511e40e92ca8a6f5e5e8fe8a093d8b302)

Minor-fix-in-the-compatibility-library.patch

@@ -0,0 +1,60 @@
+From 3e63a788d4c7b5cb1173937118135c2bcca35a02 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Fri, 3 Mar 2023 13:52:56 +0200
+Subject: [PATCH] Minor fix in the compatibility library.
+
+* compat/dbmopen.c (ndbm_open_dir_file0): Don't try to unlink
+the 1.8-compatible dir file or create a missing one if the database
+is being opened read-only.
+---
+ compat/dbmopen.c | 26 +++++++++++++++++++++-----
+ 1 file changed, 21 insertions(+), 5 deletions(-)
+
+diff --git a/compat/dbmopen.c b/compat/dbmopen.c
+index b11af98..cb979b5 100644
+--- a/compat/dbmopen.c
++++ b/compat/dbmopen.c
+@@ -81,12 +81,21 @@ ndbm_open_dir_file0 (const char *file_name, int pagfd, int mode)
+ 	{
+ 	  if (st.st_dev == pagst.st_dev && st.st_ino == pagst.st_ino)
+ 	    {
+-	      if (unlink (file_name))
++	      if (flags == O_RDONLY)
+ 		{
+-		  if ((mode & GDBM_OPENMASK) == GDBM_READER)
+-		    /* Ok, try to cope with it. */
+-		    return pagfd;
+-		  else if (errno != ENOENT)
++		  /*
++		   * Don't touch the link if the database is opened read-only.
++		   * Return a meaningful file descriptor for the sake
++		   * of those programs that compare it with pagfd trying
++		   * to detect old GDBM versions (as Sendmail does).
++		   */
++		  if ((fd = open ("/dev/null", flags)) == -1)
++		    gdbm_set_errno (NULL, GDBM_FILE_OPEN_ERROR, TRUE); 
++		  return fd;
++		}
++	      else if (unlink (file_name))
++		{
++		  if (errno != ENOENT)
+ 		    {
+ 		      gdbm_set_errno (NULL, GDBM_FILE_OPEN_ERROR, TRUE); 
+ 		      return -1;
+@@ -138,6 +147,13 @@ ndbm_open_dir_file0 (const char *file_name, int pagfd, int mode)
+ 	  return -1;
+ 	}
+     }
++  else if (flags == O_RDONLY)
++    {
++      /* See the comment above. */
++      if ((fd = open ("/dev/null", flags)) == -1)
++	gdbm_set_errno (NULL, GDBM_FILE_OPEN_ERROR, TRUE); 
++      return fd;
++    }
+   
+   /* File does not exist.  Create it. */
+   fd = open (file_name, flags | O_CREAT, pagst.st_mode & 0777);
+-- 
+2.33.0
+

gdbm.spec

@@ -1,6 +1,6 @@
 Name:       gdbm
 Version:    1.23
-Release:    1
+Release:    2
 Epoch:      1
 Summary:    A library of database functions that work similar to the standard UNIX dbm
 License:    GPLv3+
@@ -15,6 +15,7 @@ Patch4:     Fix-semantics-of-gdbm_load-r.patch
 Patch5:     Improve-handling-of-u-in-gdbm_load.patch
 Patch6:     Fix-allocated-memory-not-released.patch
 Patch7:     Restore-accidentally-removed-parameter-and-New-macro.patch
+Patch8:     Minor-fix-in-the-compatibility-library.patch
 
 BuildRequires:  gcc libtool gettext readline-devel bison flex texinfo
 
@@ -106,6 +107,9 @@ fi
 %{_infodir}/*.info*
 
 %changelog
+* Thu Mar 16 2023 wangzhiqiang <wangzhiqiang95@huawei.com> - 1:1.23-2
+- DESC:backport upstream patch
+
 * Thu Dec 8 2022 wangzhiqiang <wangzhiqiang95@huawei.com> - 1:1.23-1
 - DESC: update to version 1.23