src/bin/scripts/dropuser.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * dropuser
   4  *
   5  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   6  * Portions Copyright (c) 1994, Regents of the University of California
   7  *
   8  * src/bin/scripts/dropuser.c
   9  *
  10  *-------------------------------------------------------------------------
  11  */
  12
  13 #include "postgres_fe.h"
  14 #include "common.h"
  15 #include "common/logging.h"
  16 #include "common/string.h"
  17 #include "fe_utils/option_utils.h"
  18 #include "fe_utils/string_utils.h"
  19
  20
  21 static void help(const char *progname);
  22
  23
  24 int
  25 main(int argc, char *argv[])
  26 {
  27         static int      if_exists = 0;
  28
  29         static struct option long_options[] = {
  30                 {"host", required_argument, NULL, 'h'},
  31                 {"port", required_argument, NULL, 'p'},
  32                 {"username", required_argument, NULL, 'U'},
  33                 {"no-password", no_argument, NULL, 'w'},
  34                 {"password", no_argument, NULL, 'W'},
  35                 {"echo", no_argument, NULL, 'e'},
  36                 {"interactive", no_argument, NULL, 'i'},
  37                 {"if-exists", no_argument, &if_exists, 1},
  38                 {NULL, 0, NULL, 0}
  39         };
  40
  41         const char *progname;
  42         int                     optindex;
  43         int                     c;
  44
  45         char       *dropuser = NULL;
  46         char       *host = NULL;
  47         char       *port = NULL;
  48         char       *username = NULL;
  49         enum trivalue prompt_password = TRI_DEFAULT;
  50         ConnParams      cparams;
  51         bool            echo = false;
  52         bool            interactive = false;
  53
  54         PQExpBufferData sql;
  55
  56         PGconn     *conn;
  57         PGresult   *result;
  58
  59         pg_logging_init(argv[0]);
  60         progname = get_progname(argv[0]);
  61         set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
  62
  63         handle_help_version_opts(argc, argv, "dropuser", help);
  64
  65         while ((c = getopt_long(argc, argv, "h:p:U:wWei", long_options, &optindex)) != -1)
  66         {
  67                 switch (c)
  68                 {
  69                         case 'h':
  70                                 host = pg_strdup(optarg);
  71                                 break;
  72                         case 'p':
  73                                 port = pg_strdup(optarg);
  74                                 break;
  75                         case 'U':
  76                                 username = pg_strdup(optarg);
  77                                 break;
  78                         case 'w':
  79                                 prompt_password = TRI_NO;
  80                                 break;
  81                         case 'W':
  82                                 prompt_password = TRI_YES;
  83                                 break;
  84                         case 'e':
  85                                 echo = true;
  86                                 break;
  87                         case 'i':
  88                                 interactive = true;
  89                                 break;
  90                         case 0:
  91                                 /* this covers the long options */
  92                                 break;
  93                         default:
  94                                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
  95                                 exit(1);
  96                 }
  97         }
  98
  99         switch (argc - optind)
 100         {
 101                 case 0:
 102                         break;
 103                 case 1:
 104                         dropuser = argv[optind];
 105                         break;
 106                 default:
 107                         pg_log_error("too many command-line arguments (first is \"%s\")",
 108                                                  argv[optind + 1]);
 109                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 110                         exit(1);
 111         }
 112
 113         if (dropuser == NULL)
 114         {
 115                 if (interactive)
 116                 {
 117                         dropuser = simple_prompt("Enter name of role to drop: ", true);
 118                 }
 119                 else
 120                 {
 121                         pg_log_error("missing required argument role name");
 122                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 123                         exit(1);
 124                 }
 125         }
 126
 127         if (interactive)
 128         {
 129                 printf(_("Role \"%s\" will be permanently removed.\n"), dropuser);
 130                 if (!yesno_prompt("Are you sure?"))
 131                         exit(0);
 132         }
 133
 134         cparams.dbname = NULL;          /* this program lacks any dbname option... */
 135         cparams.pghost = host;
 136         cparams.pgport = port;
 137         cparams.pguser = username;
 138         cparams.prompt_password = prompt_password;
 139         cparams.override_dbname = NULL;
 140
 141         conn = connectMaintenanceDatabase(&cparams, progname, echo);
 142
 143         initPQExpBuffer(&sql);
 144         appendPQExpBuffer(&sql, "DROP ROLE %s%s;",
 145                                           (if_exists ? "IF EXISTS " : ""), fmtId(dropuser));
 146
 147         if (echo)
 148                 printf("%s\n", sql.data);
 149         result = PQexec(conn, sql.data);
 150
 151         if (PQresultStatus(result) != PGRES_COMMAND_OK)
 152         {
 153                 pg_log_error("removal of role \"%s\" failed: %s",
 154                                          dropuser, PQerrorMessage(conn));
 155                 PQfinish(conn);
 156                 exit(1);
 157         }
 158
 159         PQclear(result);
 160         PQfinish(conn);
 161         exit(0);
 162 }
 163
 164
 165 static void
 166 help(const char *progname)
 167 {
 168         printf(_("%s removes a PostgreSQL role.\n\n"), progname);
 169         printf(_("Usage:\n"));
 170         printf(_("  %s [OPTION]... [ROLENAME]\n"), progname);
 171         printf(_("\nOptions:\n"));
 172         printf(_("  -e, --echo                show the commands being sent to the server\n"));
 173         printf(_("  -i, --interactive         prompt before deleting anything, and prompt for\n"
 174                          "                            role name if not specified\n"));
 175         printf(_("  -V, --version             output version information, then exit\n"));
 176         printf(_("  --if-exists               don't report error if user doesn't exist\n"));
 177         printf(_("  -?, --help                show this help, then exit\n"));
 178         printf(_("\nConnection options:\n"));
 179         printf(_("  -h, --host=HOSTNAME       database server host or socket directory\n"));
 180         printf(_("  -p, --port=PORT           database server port\n"));
 181         printf(_("  -U, --username=USERNAME   user name to connect as (not the one to drop)\n"));
 182         printf(_("  -w, --no-password         never prompt for password\n"));
 183         printf(_("  -W, --password            force password prompt\n"));
 184         printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 185         printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
 186 }