src/bin/scripts/dropdb.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * dropdb
   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/dropdb.c
   9  *
  10  *-------------------------------------------------------------------------
  11  */
  12
  13 #include "postgres_fe.h"
  14 #include "common.h"
  15 #include "common/logging.h"
  16 #include "fe_utils/option_utils.h"
  17 #include "fe_utils/string_utils.h"
  18
  19
  20 static void help(const char *progname);
  21
  22
  23 int
  24 main(int argc, char *argv[])
  25 {
  26         static int      if_exists = 0;
  27
  28         static struct option long_options[] = {
  29                 {"host", required_argument, NULL, 'h'},
  30                 {"port", required_argument, NULL, 'p'},
  31                 {"username", required_argument, NULL, 'U'},
  32                 {"no-password", no_argument, NULL, 'w'},
  33                 {"password", no_argument, NULL, 'W'},
  34                 {"echo", no_argument, NULL, 'e'},
  35                 {"interactive", no_argument, NULL, 'i'},
  36                 {"if-exists", no_argument, &if_exists, 1},
  37                 {"maintenance-db", required_argument, NULL, 2},
  38                 {"force", no_argument, NULL, 'f'},
  39                 {NULL, 0, NULL, 0}
  40         };
  41
  42         const char *progname;
  43         int                     optindex;
  44         int                     c;
  45
  46         char       *dbname = NULL;
  47         char       *maintenance_db = NULL;
  48         char       *host = NULL;
  49         char       *port = NULL;
  50         char       *username = NULL;
  51         enum trivalue prompt_password = TRI_DEFAULT;
  52         ConnParams      cparams;
  53         bool            echo = false;
  54         bool            interactive = false;
  55         bool            force = false;
  56
  57         PQExpBufferData sql;
  58
  59         PGconn     *conn;
  60         PGresult   *result;
  61
  62         pg_logging_init(argv[0]);
  63         progname = get_progname(argv[0]);
  64         set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));
  65
  66         handle_help_version_opts(argc, argv, "dropdb", help);
  67
  68         while ((c = getopt_long(argc, argv, "h:p:U:wWeif", long_options, &optindex)) != -1)
  69         {
  70                 switch (c)
  71                 {
  72                         case 'h':
  73                                 host = pg_strdup(optarg);
  74                                 break;
  75                         case 'p':
  76                                 port = pg_strdup(optarg);
  77                                 break;
  78                         case 'U':
  79                                 username = pg_strdup(optarg);
  80                                 break;
  81                         case 'w':
  82                                 prompt_password = TRI_NO;
  83                                 break;
  84                         case 'W':
  85                                 prompt_password = TRI_YES;
  86                                 break;
  87                         case 'e':
  88                                 echo = true;
  89                                 break;
  90                         case 'i':
  91                                 interactive = true;
  92                                 break;
  93                         case 'f':
  94                                 force = true;
  95                                 break;
  96                         case 0:
  97                                 /* this covers the long options */
  98                                 break;
  99                         case 2:
 100                                 maintenance_db = pg_strdup(optarg);
 101                                 break;
 102                         default:
 103                                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 104                                 exit(1);
 105                 }
 106         }
 107
 108         switch (argc - optind)
 109         {
 110                 case 0:
 111                         pg_log_error("missing required argument database name");
 112                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 113                         exit(1);
 114                 case 1:
 115                         dbname = argv[optind];
 116                         break;
 117                 default:
 118                         pg_log_error("too many command-line arguments (first is \"%s\")",
 119                                                  argv[optind + 1]);
 120                         fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
 121                         exit(1);
 122         }
 123
 124         if (interactive)
 125         {
 126                 printf(_("Database \"%s\" will be permanently removed.\n"), dbname);
 127                 if (!yesno_prompt("Are you sure?"))
 128                         exit(0);
 129         }
 130
 131         initPQExpBuffer(&sql);
 132
 133         appendPQExpBuffer(&sql, "DROP DATABASE %s%s%s;",
 134                                           (if_exists ? "IF EXISTS " : ""),
 135                                           fmtId(dbname),
 136                                           force ? " WITH (FORCE)" : "");
 137
 138         /* Avoid trying to drop postgres db while we are connected to it. */
 139         if (maintenance_db == NULL && strcmp(dbname, "postgres") == 0)
 140                 maintenance_db = "template1";
 141
 142         cparams.dbname = maintenance_db;
 143         cparams.pghost = host;
 144         cparams.pgport = port;
 145         cparams.pguser = username;
 146         cparams.prompt_password = prompt_password;
 147         cparams.override_dbname = NULL;
 148
 149         conn = connectMaintenanceDatabase(&cparams, progname, echo);
 150
 151         if (echo)
 152                 printf("%s\n", sql.data);
 153         result = PQexec(conn, sql.data);
 154         if (PQresultStatus(result) != PGRES_COMMAND_OK)
 155         {
 156                 pg_log_error("database removal failed: %s", PQerrorMessage(conn));
 157                 PQfinish(conn);
 158                 exit(1);
 159         }
 160
 161         PQclear(result);
 162         PQfinish(conn);
 163         exit(0);
 164 }
 165
 166
 167 static void
 168 help(const char *progname)
 169 {
 170         printf(_("%s removes a PostgreSQL database.\n\n"), progname);
 171         printf(_("Usage:\n"));
 172         printf(_("  %s [OPTION]... DBNAME\n"), progname);
 173         printf(_("\nOptions:\n"));
 174         printf(_("  -e, --echo                show the commands being sent to the server\n"));
 175         printf(_("  -f, --force               try to terminate other connections before dropping\n"));
 176         printf(_("  -i, --interactive         prompt before deleting anything\n"));
 177         printf(_("  -V, --version             output version information, then exit\n"));
 178         printf(_("  --if-exists               don't report error if database doesn't exist\n"));
 179         printf(_("  -?, --help                show this help, then exit\n"));
 180         printf(_("\nConnection options:\n"));
 181         printf(_("  -h, --host=HOSTNAME       database server host or socket directory\n"));
 182         printf(_("  -p, --port=PORT           database server port\n"));
 183         printf(_("  -U, --username=USERNAME   user name to connect as\n"));
 184         printf(_("  -w, --no-password         never prompt for password\n"));
 185         printf(_("  -W, --password            force password prompt\n"));
 186         printf(_("  --maintenance-db=DBNAME   alternate maintenance database\n"));
 187         printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 188         printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
 189 }