psql: Add support for \dpS and \zS.

This allows an optional "S" modifier to be added to \dp and \z, to
have them include system objects in the list.

Note that this also changes the behaviour of a bare \dp or \z without
the "S" modifier to include temp objects in the list, and exclude
information_schema objects, making them consistent with other psql
meta-commands.

Nathan Bossart, reviewed by Maxim Orlov.

Discussion: https://postgr.es/m/20221206193606.GB3078082@nathanxps13

doc/src/sgml/ref/psql-ref.sgml

@@ -1825,14 +1825,16 @@ INSERT INTO tbl1 VALUES ($1, $2) \bind 'first value' 'second value' \g
 
 
       <varlistentry>
-        <term><literal>\dp [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
+        <term><literal>\dp[S] [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
         <listitem>
         <para>
         Lists tables, views and sequences with their
         associated access privileges.
         If <replaceable class="parameter">pattern</replaceable> is
         specified, only tables, views and sequences whose names match the
-        pattern are listed.
+        pattern are listed.  By default only user-created objects are shown;
+        supply a pattern or the <literal>S</literal> modifier to include
+        system objects.
         </para>
 
         <para>
@@ -3575,14 +3577,16 @@ testdb=&gt; <userinput>\setenv LESS -imx4F</userinput>
 
 
       <varlistentry>
-        <term><literal>\z [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
+        <term><literal>\z[S] [ <link linkend="app-psql-patterns"><replaceable class="parameter">pattern</replaceable></link> ]</literal></term>
         <listitem>
         <para>
         Lists tables, views and sequences with their
         associated access privileges.
         If a <replaceable class="parameter">pattern</replaceable> is
         specified, only tables, views and sequences whose names match the
-        pattern are listed.
+        pattern are listed.  By default only user-created objects are shown;
+        supply a pattern or the <literal>S</literal> modifier to include
+        system objects.
         </para>
 
         <para>

src/bin/psql/command.c

@@ -140,7 +140,8 @@ static backslashResult exec_command_write(PsqlScanState scan_state, bool active_
 static backslashResult exec_command_watch(PsqlScanState scan_state, bool active_branch,
 										  PQExpBuffer query_buf, PQExpBuffer previous_buf);
 static backslashResult exec_command_x(PsqlScanState scan_state, bool active_branch);
-static backslashResult exec_command_z(PsqlScanState scan_state, bool active_branch);
+static backslashResult exec_command_z(PsqlScanState scan_state, bool active_branch,
+									  const char *cmd);
 static backslashResult exec_command_shell_escape(PsqlScanState scan_state, bool active_branch);
 static backslashResult exec_command_slash_command_help(PsqlScanState scan_state, bool active_branch);
 static char *read_connect_arg(PsqlScanState scan_state);
@@ -413,8 +414,8 @@ exec_command(const char *cmd,
 									query_buf, previous_buf);
 	else if (strcmp(cmd, "x") == 0)
 		status = exec_command_x(scan_state, active_branch);
-	else if (strcmp(cmd, "z") == 0)
-		status = exec_command_z(scan_state, active_branch);
+	else if (strcmp(cmd, "z") == 0 || strcmp(cmd, "zS") == 0)
+		status = exec_command_z(scan_state, active_branch, cmd);
 	else if (strcmp(cmd, "!") == 0)
 		status = exec_command_shell_escape(scan_state, active_branch);
 	else if (strcmp(cmd, "?") == 0)
@@ -875,7 +876,7 @@ exec_command_d(PsqlScanState scan_state, bool active_branch, const char *cmd)
 				success = listCollations(pattern, show_verbose, show_system);
 				break;
 			case 'p':
-				success = permissionsList(pattern);
+				success = permissionsList(pattern, show_system);
 				break;
 			case 'P':
 				{
@@ -2822,16 +2823,22 @@ exec_command_x(PsqlScanState scan_state, bool active_branch)
  * \z -- list table privileges (equivalent to \dp)
  */
 static backslashResult
-exec_command_z(PsqlScanState scan_state, bool active_branch)
+exec_command_z(PsqlScanState scan_state, bool active_branch, const char *cmd)
 {
 	bool		success = true;
 
 	if (active_branch)
 	{
-		char	   *pattern = psql_scan_slash_option(scan_state,
-													 OT_NORMAL, NULL, true);
+		char	   *pattern;
+		bool		show_system;
+
+		pattern = psql_scan_slash_option(scan_state,
+										 OT_NORMAL, NULL, true);
+
+		show_system = strchr(cmd, 'S') ? true : false;
+
+		success = permissionsList(pattern, show_system);
 
-		success = permissionsList(pattern);
 		free(pattern);
 	}
 	else

src/bin/psql/describe.c

@@ -1002,7 +1002,7 @@ listAllDbs(const char *pattern, bool verbose)
  * \z (now also \dp -- perhaps more mnemonic)
  */
 bool
-permissionsList(const char *pattern)
+permissionsList(const char *pattern, bool showSystem)
 {
 	PQExpBufferData buf;
 	PGresult   *res;
@@ -1121,15 +1121,13 @@ permissionsList(const char *pattern)
 						 CppAsString2(RELKIND_FOREIGN_TABLE) ","
 						 CppAsString2(RELKIND_PARTITIONED_TABLE) ")\n");
 
-	/*
-	 * Unless a schema pattern is specified, we suppress system and temp
-	 * tables, since they normally aren't very interesting from a permissions
-	 * point of view.  You can see 'em by explicit request though, eg with \z
-	 * pg_catalog.*
-	 */
+	if (!showSystem && !pattern)
+		appendPQExpBufferStr(&buf, "      AND n.nspname <> 'pg_catalog'\n"
+							 "      AND n.nspname <> 'information_schema'\n");
+
 	if (!validateSQLNamePattern(&buf, pattern, true, false,
 								"n.nspname", "c.relname", NULL,
-								"n.nspname !~ '^pg_' AND pg_catalog.pg_table_is_visible(c.oid)",
+								"pg_catalog.pg_table_is_visible(c.oid)",
 								NULL, 3))
 		goto error_return;
 

src/bin/psql/describe.h

@@ -38,7 +38,7 @@ extern bool describeRoles(const char *pattern, bool verbose, bool showSystem);
 extern bool listDbRoleSettings(const char *pattern, const char *pattern2);
 
 /* \z (or \dp) */
-extern bool permissionsList(const char *pattern);
+extern bool permissionsList(const char *pattern, bool showSystem);
 
 /* \ddp */
 extern bool listDefaultACLs(const char *pattern);