Allow dumping of roles or tablespaces

Per discussion on -hackers, the attached patch introduces an optional
parameter to pg_dumpall's -g (--globals-only) option to allow roles or
tablespaces to be dumped on their own.

eg.

pg_dumpall -g  -- Dump roles and tablespaces per current behaviour
pg_dumpall -gr -- Dump roles only (or users and groups)
pg_dumpall -gt -- Dump tablespaces only

Regards, Dave.
Index: doc/src/sgml/ref/pg_dumpall.sgml
===================================================================
RCS file: /projects/cvsroot/pgsql/doc/src/sgml/ref/pg_dumpall.sgml,v
retrieving revision 1.58
diff -c -r1.58 pg_dumpall.sgml
*** doc/src/sgml/ref/pg_dumpall.sgml    7 Oct 2006 20:59:04 -0000    1.58
--- doc/src/sgml/ref/pg_dumpall.sgml    12 Jan 2007 14:01:10 -0000
***************
*** 130,140 ****
       </varlistentry>

       <varlistentry>
!       <term><option>-g</option></term>
!       <term><option>--globals-only</option></term>
        <listitem>
         <para>
!         Dump only global objects (users and groups), no databases.
         </para>
        </listitem>
       </varlistentry>
--- 130,145 ----
       </varlistentry>

       <varlistentry>
!       <term><option>-g[<replaceable class="parameter">r</replaceable>|<replaceable
class="parameter">t</replaceable></option></term>
!       <term><option>--globals-only[=<replaceable class="parameter">r</replaceable>|<replaceable
class="parameter">t</replaceable></option></term>
        <listitem>
         <para>
!         Dump only global objects (roles and/or tablespaces), no databases.
!         The <replaceable class="parameter">r</replaceable> parameter will
!         cause only roles to be dumped, and the
!         <replaceable class="parameter">t</replaceable> parameter will cause
!         only tablespaces to be dumped. If no parameter is specified, all
!         global object types will be dumped.
         </para>
        </listitem>
       </varlistentry>
Index: src/bin/pg_dump/pg_dumpall.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/bin/pg_dump/pg_dumpall.c,v
retrieving revision 1.86
diff -c -r1.86 pg_dumpall.c
*** src/bin/pg_dump/pg_dumpall.c    5 Jan 2007 22:19:48 -0000    1.86
--- src/bin/pg_dump/pg_dumpall.c    12 Jan 2007 14:01:12 -0000
***************
*** 78,83 ****
--- 78,85 ----
      bool        force_password = false;
      bool        data_only = false;
      bool        globals_only = false;
+     bool        roles_only = false;
+     bool        tablespaces_only = false;
      bool        schema_only = false;
      PGconn       *conn;
      int            encoding;
***************
*** 91,97 ****
          {"inserts", no_argument, NULL, 'd'},
          {"attribute-inserts", no_argument, NULL, 'D'},
          {"column-inserts", no_argument, NULL, 'D'},
!         {"globals-only", no_argument, NULL, 'g'},
          {"host", required_argument, NULL, 'h'},
          {"ignore-version", no_argument, NULL, 'i'},
          {"oids", no_argument, NULL, 'o'},
--- 93,99 ----
          {"inserts", no_argument, NULL, 'd'},
          {"attribute-inserts", no_argument, NULL, 'D'},
          {"column-inserts", no_argument, NULL, 'D'},
!         {"globals-only", optional_argument, NULL, 'g'},
          {"host", required_argument, NULL, 'h'},
          {"ignore-version", no_argument, NULL, 'i'},
          {"oids", no_argument, NULL, 'o'},
***************
*** 161,167 ****

      pgdumpopts = createPQExpBuffer();

!     while ((c = getopt_long(argc, argv, "acdDgh:ioOp:sS:U:vWxX:", long_options, &optindex)) != -1)
      {
          switch (c)
          {
--- 163,169 ----

      pgdumpopts = createPQExpBuffer();

!     while ((c = getopt_long(argc, argv, "acdDg::h:ioOp:sS:U:vWxX:", long_options, &optindex)) != -1)
      {
          switch (c)
          {
***************
*** 181,186 ****
--- 183,203 ----

              case 'g':
                  globals_only = true;
+                 if (optarg)
+                 {
+                     if (strcmp(optarg, "r") == 0)
+                         roles_only = true;
+                     else if    (strcmp(optarg, "t") == 0)
+                         tablespaces_only = true;
+                     else
+                     {
+                         fprintf(stderr,
+                                 _("%s: invalid -g option -- %s\n"),
+                                 progname, optarg);
+                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
+                         exit(1);
+                     }
+                 }
                  break;

              case 'h':
***************
*** 332,349 ****
              printf("SET escape_string_warning = 'off';\n");
          printf("\n");

!         /* Dump roles (users) */
!         dumpRoles(conn);

!         /* Dump role memberships --- need different method for pre-8.1 */
!         if (server_version >= 80100)
!             dumpRoleMembership(conn);
!         else
!             dumpGroups(conn);

!         /* Dump tablespaces */
!         if (server_version >= 80000)
!             dumpTablespaces(conn);

          /* Dump CREATE DATABASE commands */
          if (!globals_only)
--- 349,372 ----
              printf("SET escape_string_warning = 'off';\n");
          printf("\n");

!         if (!tablespaces_only)
!         {
!             /* Dump roles (users) */
!             dumpRoles(conn);

!             /* Dump role memberships --- need different method for pre-8.1 */
!             if (server_version >= 80100)
!                 dumpRoleMembership(conn);
!             else
!                 dumpGroups(conn);
!         }

!         if (!roles_only)
!         {
!             /* Dump tablespaces */
!             if (server_version >= 80000)
!                 dumpTablespaces(conn);
!         }

          /* Dump CREATE DATABASE commands */
          if (!globals_only)
***************
*** 381,387 ****
      printf(_("  -c, --clean              clean (drop) databases prior to create\n"));
      printf(_("  -d, --inserts            dump data as INSERT, rather than COPY, commands\n"));
      printf(_("  -D, --column-inserts     dump data as INSERT commands with column names\n"));
!     printf(_("  -g, --globals-only       dump only global objects, no databases\n"));
      printf(_("  -o, --oids               include OIDs in dump\n"));
      printf(_("  -O, --no-owner           skip restoration of object ownership\n"));
      printf(_("  -s, --schema-only        dump only the schema, no data\n"));
--- 404,410 ----
      printf(_("  -c, --clean              clean (drop) databases prior to create\n"));
      printf(_("  -d, --inserts            dump data as INSERT, rather than COPY, commands\n"));
      printf(_("  -D, --column-inserts     dump data as INSERT commands with column names\n"));
!     printf(_("  -g, --globals-only=[r|t] dump only global objects, no databases. Optionally restrict to roles or
tablespaces\n"));
      printf(_("  -o, --oids               include OIDs in dump\n"));
      printf(_("  -O, --no-owner           skip restoration of object ownership\n"));
      printf(_("  -s, --schema-only        dump only the schema, no data\n"));