Change pg_upgrade to use port 50432 by default to avoid unintended

client connections during the upgrade.  Also rename data/bin/port
environment variables to being with 'PG'.  Also no longer honor PGPORT.

contrib/pg_upgrade/check.c

@@ -29,6 +29,9 @@ output_check_banner(bool *live_check)
 	if (user_opts.check && is_server_running(old_cluster.pgdata))
 	{
 		*live_check = true;
+		if (old_cluster.port == DEF_PGUPORT)
+			pg_log(PG_FATAL, "When checking a live old server, "
+				   "you must specify the old server's port number.\n");
 		if (old_cluster.port == new_cluster.port)
 			pg_log(PG_FATAL, "When checking a live server, "
 				   "the old and new port numbers must be different.\n");

contrib/pg_upgrade/option.c

@@ -58,8 +58,8 @@ parseCommandLine(int argc, char *argv[])
 	os_info.progname = get_progname(argv[0]);
 
 	/* Process libpq env. variables; load values here for usage() output */
-	old_cluster.port = getenv("PGPORT") ? atoi(getenv("PGPORT")) : DEF_PGPORT;
-	new_cluster.port = getenv("PGPORT") ? atoi(getenv("PGPORT")) : DEF_PGPORT;
+	old_cluster.port = getenv("PGPORTOLD") ? atoi(getenv("PGPORTOLD")) : DEF_PGUPORT;
+	new_cluster.port = getenv("PGPORTNEW") ? atoi(getenv("PGPORTNEW")) : DEF_PGUPORT;
 
 	os_user_effective_id = get_user_info(&os_info.user);
 	/* we override just the database user name;  we got the OS id above */
@@ -203,13 +203,13 @@ parseCommandLine(int argc, char *argv[])
 	}
 
 	/* Get values from env if not already set */
-	check_required_directory(&old_cluster.bindir, "OLDBINDIR", "-b",
+	check_required_directory(&old_cluster.bindir, "PGBINOLD", "-b",
 							"old cluster binaries reside");
-	check_required_directory(&new_cluster.bindir, "NEWBINDIR", "-B",
+	check_required_directory(&new_cluster.bindir, "PGBINNEW", "-B",
 							"new cluster binaries reside");
-	check_required_directory(&old_cluster.pgdata, "OLDDATADIR", "-d",
+	check_required_directory(&old_cluster.pgdata, "PGDATAOLD", "-d",
 							"old cluster data resides");
-	check_required_directory(&new_cluster.pgdata, "NEWDATADIR", "-D",
+	check_required_directory(&new_cluster.pgdata, "PGDATANEW", "-D",
 							"new cluster data resides");
 }
 
@@ -254,17 +254,17 @@ For example:\n\
 or\n"), old_cluster.port, new_cluster.port, os_info.user);
 #ifndef WIN32
 	printf(_("\
-  $ export OLDDATADIR=oldCluster/data\n\
-  $ export NEWDATADIR=newCluster/data\n\
-  $ export OLDBINDIR=oldCluster/bin\n\
-  $ export NEWBINDIR=newCluster/bin\n\
+  $ export PGDATAOLD=oldCluster/data\n\
+  $ export PGDATANEW=newCluster/data\n\
+  $ export PGBINOLD=oldCluster/bin\n\
+  $ export PGBINNEW=newCluster/bin\n\
   $ pg_upgrade\n"));
 #else
 	printf(_("\
-  C:\\> set OLDDATADIR=oldCluster/data\n\
-  C:\\> set NEWDATADIR=newCluster/data\n\
-  C:\\> set OLDBINDIR=oldCluster/bin\n\
-  C:\\> set NEWBINDIR=newCluster/bin\n\
+  C:\\> set PGDATAOLD=oldCluster/data\n\
+  C:\\> set PGDATANEW=newCluster/data\n\
+  C:\\> set PGBINOLD=oldCluster/bin\n\
+  C:\\> set PGBINNEW=newCluster/bin\n\
   C:\\> pg_upgrade\n"));
 #endif
 	printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));

contrib/pg_upgrade/pg_upgrade.h

@@ -15,6 +15,9 @@
 
 #include "libpq-fe.h"
 
+/* Use port in the private/dynamic port number range */
+#define DEF_PGUPORT			50432
+
 /* Allocate for null byte */
 #define USER_NAME_SIZE		128
 

doc/src/sgml/pgupgrade.sgml

@@ -60,14 +60,14 @@
       <term><option>-b</option> <replaceable>old_bindir</></term>
       <term><option>--old-bindir=</option><replaceable>old_bindir</></term>
       <listitem><para>the old cluster executable directory;
-      environment variable <envar>OLDBINDIR</></para></listitem>
+      environment variable <envar>PGBINOLD</></para></listitem>
      </varlistentry>
 
      <varlistentry>
       <term><option>-B</option> <replaceable>new_bindir</></term>
       <term><option>--new-bindir=</option><replaceable>new_bindir</></term>
       <listitem><para>the new cluster executable directory;
-      environment variable <envar>NEWBINDIR</></para></listitem>
+      environment variable <envar>PGBINNEW</></para></listitem>
      </varlistentry>
 
      <varlistentry>
@@ -80,14 +80,14 @@
       <term><option>-d</option> <replaceable>old_datadir</></term>
       <term><option>--old-datadir=</option><replaceable>old_datadir</></term>
       <listitem><para>the old cluster data directory; environment
-      variable <envar>OLDDATADIR</></para></listitem>
+      variable <envar>PGDATAOLD</></para></listitem>
      </varlistentry>
 
      <varlistentry>
       <term><option>-D</option> <replaceable>new_datadir</></term>
       <term><option>--new-datadir=</option><replaceable>new_datadir</></term>
       <listitem><para>the new cluster data directory; environment
-      variable <envar>NEWDATADIR</></para></listitem>
+      variable <envar>PGDATANEW</></para></listitem>
      </varlistentry>
 
      <varlistentry>
@@ -118,14 +118,14 @@
       <term><option>-p</option> <replaceable>old_port_number</></term>
       <term><option>--old-port=</option><replaceable>old_portnum</></term>
       <listitem><para>the old cluster port number; environment
-      variable <envar>PGPORT</></para></listitem>
+      variable <envar>PGPORTOLD</></para></listitem>
      </varlistentry>
 
      <varlistentry>
       <term><option>-P</option> <replaceable>new_port_number</></term>
       <term><option>--new-port=</option><replaceable>new_portnum</></term>
       <listitem><para>the new cluster port number; environment
-      variable <envar>PGPORT</></para></listitem>
+      variable <envar>PGPORTNEW</></para></listitem>
      </varlistentry>
 
      <varlistentry>
@@ -256,8 +256,7 @@ gmake prefix=/usr/local/pgsql.new install
      so you might want to set authentication to <literal>trust</> in
      <filename>pg_hba.conf</>, or if using <literal>md5</> authentication,
      use a <filename>~/.pgpass</> file (see <xref linkend="libpq-pgpass">)
-     to avoid being prompted repeatedly for a password.  Also make sure
-     pg_upgrade is the only program that can connect to the clusters.
+     to avoid being prompted repeatedly for a password.
     </para>
    </step>
 
@@ -303,8 +302,13 @@ NET STOP pgsql-8.3  (<productname>PostgreSQL</> 8.3 and older used a different s
      copying), but you will not be able to access your old cluster
      once you start the new cluster after the upgrade.  Link mode also
      requires that the old and new cluster data directories be in the
-     same file system.  See <literal>pg_upgrade --help</> for a full
-     list of options.
+     same file system.
+   </para>
+
+   <para>
+    <application>pg_upgrade</> defaults to running servers on port
+    50432 to avoid unintended client connections.  See <literal>pg_upgrade
+    --help</> for a full list of options.
    </para>
 
     <para>