MDEV-6485 Hard-coded paths in the source cannot be opt-out

when looking for my.cnf files: if DEFAULT_SYSCONFDIR (or INSTALL_SYSCONFDIR)
is specified (for rpms it always is), use that instead of hardcoded /etc path.

mysys/my_default.c

@@ -138,9 +138,8 @@ static int search_default_file_with_ext(Process_option_func func,
   - Windows:     GetWindowsDirectory()
   - Windows:     C:/
   - Windows:     Directory above where the executable is located
-  - Unix:        /etc/
-  - Unix:        /etc/mysql/
-  - Unix:        --sysconfdir=<path> (compile-time option)
+  - Unix:        /etc/ or the value of DEFAULT_SYSCONFDIR, if defined
+  - Unix:        /etc/mysql/ unless DEFAULT_SYSCONFDIR is defined
   - ALL:         getenv("MYSQL_HOME")
   - ALL:         --defaults-extra-file=<path> (run-time option)
   - Unix:        ~/
@@ -1224,12 +1223,12 @@ static const char **init_default_directories(MEM_ROOT *alloc)
 
 #else
 
-  errors += add_directory(alloc, "/etc/", dirs);
-  errors += add_directory(alloc, "/etc/mysql/", dirs);
-
 #if defined(DEFAULT_SYSCONFDIR)
   if (DEFAULT_SYSCONFDIR[0])
     errors += add_directory(alloc, DEFAULT_SYSCONFDIR, dirs);
+#else
+  errors += add_directory(alloc, "/etc/", dirs);
+  errors += add_directory(alloc, "/etc/mysql/", dirs);
 #endif /* DEFAULT_SYSCONFDIR */
 
 #endif

scripts/CMakeLists.txt

@@ -221,7 +221,11 @@ INSTALL_SCRIPT(
 ENDIF()
 
 SET(prefix "${CMAKE_INSTALL_PREFIX}")
-SET(sysconfdir ${prefix})
+IF(INSTALL_SYSCONFDIR)
+  SET(sysconfdir ${DEFAULT_SYSCONFDIR})
+ELSE()
+  SET(sysconfdir "/etc")
+ENDIF()
 SET(bindir ${prefix}/${INSTALL_BINDIR})
 SET(libexecdir ${prefix}/${INSTALL_SBINDIR})
 SET(scriptdir ${prefix}/${INSTALL_BINDIR})

scripts/mysqlaccess.sh

@@ -261,12 +261,12 @@ Release Notes:
     * log-file for debug-output : /tmp/mysqlaccess.log
     * default values are read from a configuration file $script.conf
       first this file is looked for in the current directory; if not
-      found it is looked for in /etc/
+      found it is looked for in @sysconfdir@
       Note that when default-values are given, these can't get overriden
       by empty (blanc) values!
     * CGI-BIN version with HTML and forms interface.  Simply place the
       script in an ScriptAliased directory, make the configuration file
-      available in the that directory or in /etc, and point your browser
+      available in the that directory or in @sysconfdir@, and point your browser
       to the right URL. 
     * copy the grant-rules to temporary tables, where you are safe to
       play with them.
@@ -480,12 +480,12 @@ MySQLaccess::Report::Print_Header();
   if (-f "./$script_conf") {
      require "./$script_conf";
   }
+  elsif (-f "@prefix@/$script_conf") {
+     require "@prefix@/$script_conf";
+  }
   elsif (-f "@sysconfdir@/$script_conf") {
      require "@sysconfdir@/$script_conf";
   }
-  elsif (-f "/etc/$script_conf") {
-     require "/etc/$script_conf";
-  }
 
 # ****************************
 # Read in all parameters
@@ -950,8 +950,8 @@ sub MergeConfigFile {
 # =================================
 sub MergeConfigFiles {
     my ($name,$pass,$uid,$gid,$quota,$comment,$gcos,$dir,$shell) = getpwuid $<;
+    MergeConfigFile("@prefix@/my.cnf");
     MergeConfigFile("@sysconfdir@/my.cnf");
-    MergeConfigFile("/etc/my.cnf");
     MergeConfigFile("$dir/.my.cnf");
 }
 

scripts/mysqld_multi.sh

@@ -499,9 +499,9 @@ sub list_defaults_files
 
   my %seen;  # Don't list the same file more than once
   return grep { defined $_ and not $seen{$_}++ and -f $_ and -r $_ }
-              ('/etc/my.cnf',
-               '/etc/mysql/my.cnf',
-               '@sysconfdir@/my.cnf',
+              ('@sysconfdir@/my.cnf',
+               '@sysconfdir@/mysql/my.cnf',
+               '@prefix@/my.cnf',
                ($ENV{MYSQL_HOME} ? "$ENV{MYSQL_HOME}/my.cnf" : undef),
                $opt{'extra-file'},
                ($ENV{HOME} ? "$ENV{HOME}/.my.cnf" : undef));
@@ -632,7 +632,7 @@ sub example
 {
   print <<EOF;
 # This is an example of a my.cnf file for $my_progname.
-# Usually this file is located in home dir ~/.my.cnf or /etc/my.cnf
+# Usually this file is located in home dir ~/.my.cnf or @sysconfdir@/my.cnf
 #
 # SOME IMPORTANT NOTES FOLLOW:
 #
@@ -705,7 +705,7 @@ sub example
 #   (as per Linux/Unix standard). You may even replace the
 #   /etc/init.d/mysql.server script with it.
 #
-#   Before using, you must create a my.cnf file either in @sysconfdir@/my.cnf
+#   Before using, you must create a my.cnf file either in @prefix@/my.cnf
 #   or /root/.my.cnf and add the [mysqld_multi] and [mysqld#] groups.
 #
 #   The script can be found from support-files/mysqld_multi.server.sh

scripts/mytop.sh

@@ -70,7 +70,6 @@ sub GetShowStatus();
 sub cmd_s;
 sub cmd_S;
 sub cmd_q;
-sub FindProg($);
 
 ## Default Config Values
 
@@ -1366,9 +1365,9 @@ sub GetInnoDBStatus()
 {
     if (not $config{pager})
     {
-        if (not $config{pager} = FindProg('less'))
+        if (not $config{pager} = my_which('less'))
         {
-            $config{pager} = FindProg('more');
+            $config{pager} = my_which('more');
         }
     }
 
@@ -1467,9 +1466,9 @@ sub GetShowVariables()
 {
     if (not $config{pager})
     {
-        if (not $config{pager} = FindProg('less'))
+        if (not $config{pager} = my_which('less'))
         {
-            $config{pager} = FindProg('more');
+            $config{pager} = my_which('more');
         }
     }
 
@@ -1825,25 +1824,6 @@ sub Execute($)
     return $sth;
 }
 
-sub FindProg($)
-{
-    my $prog  = shift;
-    my $found = undef;
-    my @search_dirs = ("/bin", "/usr/bin", "/usr/sbin",
-                       "/usr/local/bin", "/usr/local/sbin");
-
-    for (@search_dirs)
-    {
-        my $loc = "$_/$prog";
-        if (-e $loc)
-        {
-            $found = $loc;
-            last;
-        }
-    }
-    return $found;
-}
-
 ####
 #### my_which is used, because we can't assume that every system has the
 #### which -command. my_which can take only one argument at a time.