LCOV - code coverage report
Current view: top level - src/bin/pg_upgrade - option.c (source / functions) Hit Total Coverage
Test: PostgreSQL 18devel Lines: 142 231 61.5 %
Date: 2025-04-01 15:15:16 Functions: 5 5 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :  *  option.c
       3             :  *
       4             :  *  options functions
       5             :  *
       6             :  *  Copyright (c) 2010-2025, PostgreSQL Global Development Group
       7             :  *  src/bin/pg_upgrade/option.c
       8             :  */
       9             : 
      10             : #include "postgres_fe.h"
      11             : 
      12             : #ifdef WIN32
      13             : #include <io.h>
      14             : #endif
      15             : 
      16             : #include "common/string.h"
      17             : #include "fe_utils/option_utils.h"
      18             : #include "getopt_long.h"
      19             : #include "pg_upgrade.h"
      20             : #include "utils/pidfile.h"
      21             : 
      22             : static void usage(void);
      23             : static void check_required_directory(char **dirpath,
      24             :                                      const char *envVarName, bool useCwd,
      25             :                                      const char *cmdLineOption, const char *description,
      26             :                                      bool missingOk);
      27             : #define FIX_DEFAULT_READ_ONLY "-c default_transaction_read_only=false"
      28             : 
      29             : 
      30             : UserOpts    user_opts;
      31             : 
      32             : 
      33             : /*
      34             :  * parseCommandLine()
      35             :  *
      36             :  *  Parses the command line (argc, argv[]) and loads structures
      37             :  */
      38             : void
      39          40 : parseCommandLine(int argc, char *argv[])
      40             : {
      41             :     static struct option long_options[] = {
      42             :         {"old-datadir", required_argument, NULL, 'd'},
      43             :         {"new-datadir", required_argument, NULL, 'D'},
      44             :         {"old-bindir", required_argument, NULL, 'b'},
      45             :         {"new-bindir", required_argument, NULL, 'B'},
      46             :         {"no-sync", no_argument, NULL, 'N'},
      47             :         {"old-options", required_argument, NULL, 'o'},
      48             :         {"new-options", required_argument, NULL, 'O'},
      49             :         {"old-port", required_argument, NULL, 'p'},
      50             :         {"new-port", required_argument, NULL, 'P'},
      51             : 
      52             :         {"username", required_argument, NULL, 'U'},
      53             :         {"check", no_argument, NULL, 'c'},
      54             :         {"link", no_argument, NULL, 'k'},
      55             :         {"retain", no_argument, NULL, 'r'},
      56             :         {"jobs", required_argument, NULL, 'j'},
      57             :         {"socketdir", required_argument, NULL, 's'},
      58             :         {"verbose", no_argument, NULL, 'v'},
      59             :         {"clone", no_argument, NULL, 1},
      60             :         {"copy", no_argument, NULL, 2},
      61             :         {"copy-file-range", no_argument, NULL, 3},
      62             :         {"sync-method", required_argument, NULL, 4},
      63             :         {"no-statistics", no_argument, NULL, 5},
      64             :         {"set-char-signedness", required_argument, NULL, 6},
      65             :         {"swap", no_argument, NULL, 7},
      66             : 
      67             :         {NULL, 0, NULL, 0}
      68             :     };
      69             :     int         option;         /* Command line option */
      70          40 :     int         optindex = 0;   /* used by getopt_long */
      71             :     int         os_user_effective_id;
      72             :     DataDirSyncMethod unused;
      73             : 
      74          40 :     user_opts.do_sync = true;
      75          40 :     user_opts.transfer_mode = TRANSFER_MODE_COPY;
      76          40 :     user_opts.do_statistics = true;
      77          40 :     user_opts.char_signedness = -1;
      78             : 
      79          40 :     os_info.progname = get_progname(argv[0]);
      80             : 
      81             :     /* Process libpq env. variables; load values here for usage() output */
      82          40 :     old_cluster.port = getenv("PGPORTOLD") ? atoi(getenv("PGPORTOLD")) : DEF_PGUPORT;
      83          40 :     new_cluster.port = getenv("PGPORTNEW") ? atoi(getenv("PGPORTNEW")) : DEF_PGUPORT;
      84             : 
      85          40 :     os_user_effective_id = get_user_info(&os_info.user);
      86             :     /* we override just the database user name;  we got the OS id above */
      87          40 :     if (getenv("PGUSER"))
      88             :     {
      89           0 :         pg_free(os_info.user);
      90             :         /* must save value, getenv()'s pointer is not stable */
      91           0 :         os_info.user = pg_strdup(getenv("PGUSER"));
      92             :     }
      93             : 
      94          40 :     if (argc > 1)
      95             :     {
      96          40 :         if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
      97             :         {
      98           2 :             usage();
      99           2 :             exit(0);
     100             :         }
     101          38 :         if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
     102             :         {
     103           2 :             puts("pg_upgrade (PostgreSQL) " PG_VERSION);
     104           2 :             exit(0);
     105             :         }
     106             :     }
     107             : 
     108             :     /* Allow help and version to be run as root, so do the test here. */
     109          36 :     if (os_user_effective_id == 0)
     110           0 :         pg_fatal("%s: cannot be run as root", os_info.progname);
     111             : 
     112         354 :     while ((option = getopt_long(argc, argv, "b:B:cd:D:j:kNo:O:p:P:rs:U:v",
     113             :                                  long_options, &optindex)) != -1)
     114             :     {
     115         320 :         switch (option)
     116             :         {
     117          34 :             case 'b':
     118          34 :                 old_cluster.bindir = pg_strdup(optarg);
     119          34 :                 break;
     120             : 
     121          34 :             case 'B':
     122          34 :                 new_cluster.bindir = pg_strdup(optarg);
     123          34 :                 break;
     124             : 
     125          10 :             case 'c':
     126          10 :                 user_opts.check = true;
     127          10 :                 break;
     128             : 
     129          34 :             case 'd':
     130          34 :                 old_cluster.pgdata = pg_strdup(optarg);
     131          34 :                 break;
     132             : 
     133          34 :             case 'D':
     134          34 :                 new_cluster.pgdata = pg_strdup(optarg);
     135          34 :                 break;
     136             : 
     137           0 :             case 'j':
     138           0 :                 user_opts.jobs = atoi(optarg);
     139           0 :                 break;
     140             : 
     141           2 :             case 'k':
     142           2 :                 user_opts.transfer_mode = TRANSFER_MODE_LINK;
     143           2 :                 break;
     144             : 
     145          34 :             case 'N':
     146          34 :                 user_opts.do_sync = false;
     147          34 :                 break;
     148             : 
     149           0 :             case 'o':
     150             :                 /* append option? */
     151           0 :                 if (!old_cluster.pgopts)
     152           0 :                     old_cluster.pgopts = pg_strdup(optarg);
     153             :                 else
     154             :                 {
     155           0 :                     char       *old_pgopts = old_cluster.pgopts;
     156             : 
     157           0 :                     old_cluster.pgopts = psprintf("%s %s", old_pgopts, optarg);
     158           0 :                     free(old_pgopts);
     159             :                 }
     160           0 :                 break;
     161             : 
     162           0 :             case 'O':
     163             :                 /* append option? */
     164           0 :                 if (!new_cluster.pgopts)
     165           0 :                     new_cluster.pgopts = pg_strdup(optarg);
     166             :                 else
     167             :                 {
     168           0 :                     char       *new_pgopts = new_cluster.pgopts;
     169             : 
     170           0 :                     new_cluster.pgopts = psprintf("%s %s", new_pgopts, optarg);
     171           0 :                     free(new_pgopts);
     172             :                 }
     173           0 :                 break;
     174             : 
     175          34 :             case 'p':
     176          34 :                 if ((old_cluster.port = atoi(optarg)) <= 0)
     177           0 :                     pg_fatal("invalid old port number");
     178          34 :                 break;
     179             : 
     180          34 :             case 'P':
     181          34 :                 if ((new_cluster.port = atoi(optarg)) <= 0)
     182           0 :                     pg_fatal("invalid new port number");
     183          34 :                 break;
     184             : 
     185           0 :             case 'r':
     186           0 :                 log_opts.retain = true;
     187           0 :                 break;
     188             : 
     189          34 :             case 's':
     190          34 :                 user_opts.socketdir = pg_strdup(optarg);
     191          34 :                 break;
     192             : 
     193           0 :             case 'U':
     194           0 :                 pg_free(os_info.user);
     195           0 :                 os_info.user = pg_strdup(optarg);
     196           0 :                 os_info.user_specified = true;
     197           0 :                 break;
     198             : 
     199           0 :             case 'v':
     200           0 :                 log_opts.verbose = true;
     201           0 :                 break;
     202             : 
     203           2 :             case 1:
     204           2 :                 user_opts.transfer_mode = TRANSFER_MODE_CLONE;
     205           2 :                 break;
     206             : 
     207          26 :             case 2:
     208          26 :                 user_opts.transfer_mode = TRANSFER_MODE_COPY;
     209          26 :                 break;
     210             : 
     211           2 :             case 3:
     212           2 :                 user_opts.transfer_mode = TRANSFER_MODE_COPY_FILE_RANGE;
     213           2 :                 break;
     214           0 :             case 4:
     215           0 :                 if (!parse_sync_method(optarg, &unused))
     216           0 :                     exit(1);
     217           0 :                 user_opts.sync_method = pg_strdup(optarg);
     218           0 :                 break;
     219             : 
     220           0 :             case 5:
     221           0 :                 user_opts.do_statistics = false;
     222           0 :                 break;
     223             : 
     224           2 :             case 6:
     225           2 :                 if (pg_strcasecmp(optarg, "signed") == 0)
     226           2 :                     user_opts.char_signedness = 1;
     227           0 :                 else if (pg_strcasecmp(optarg, "unsigned") == 0)
     228           0 :                     user_opts.char_signedness = 0;
     229             :                 else
     230           0 :                     pg_fatal("invalid argument for option %s", "--set-char-signedness");
     231           2 :                 break;
     232             : 
     233           2 :             case 7:
     234           2 :                 user_opts.transfer_mode = TRANSFER_MODE_SWAP;
     235           2 :                 break;
     236             : 
     237           2 :             default:
     238           2 :                 fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
     239             :                         os_info.progname);
     240           2 :                 exit(1);
     241             :         }
     242             :     }
     243             : 
     244          34 :     if (optind < argc)
     245           0 :         pg_fatal("too many command-line arguments (first is \"%s\")", argv[optind]);
     246             : 
     247          34 :     if (!user_opts.sync_method)
     248          34 :         user_opts.sync_method = pg_strdup("fsync");
     249             : 
     250          34 :     if (log_opts.verbose)
     251           0 :         pg_log(PG_REPORT, "Running in verbose mode");
     252             : 
     253          34 :     log_opts.isatty = isatty(fileno(stdout));
     254             : 
     255             :     /* Turn off read-only mode;  add prefix to PGOPTIONS? */
     256          34 :     if (getenv("PGOPTIONS"))
     257             :     {
     258           0 :         char       *pgoptions = psprintf("%s %s", FIX_DEFAULT_READ_ONLY,
     259             :                                          getenv("PGOPTIONS"));
     260             : 
     261           0 :         setenv("PGOPTIONS", pgoptions, 1);
     262           0 :         pfree(pgoptions);
     263             :     }
     264             :     else
     265          34 :         setenv("PGOPTIONS", FIX_DEFAULT_READ_ONLY, 1);
     266             : 
     267             :     /* Get values from env if not already set */
     268          34 :     check_required_directory(&old_cluster.bindir, "PGBINOLD", false,
     269          34 :                              "-b", _("old cluster binaries reside"), false);
     270          34 :     check_required_directory(&new_cluster.bindir, "PGBINNEW", false,
     271          34 :                              "-B", _("new cluster binaries reside"), true);
     272          34 :     check_required_directory(&old_cluster.pgdata, "PGDATAOLD", false,
     273          34 :                              "-d", _("old cluster data resides"), false);
     274          34 :     check_required_directory(&new_cluster.pgdata, "PGDATANEW", false,
     275          34 :                              "-D", _("new cluster data resides"), false);
     276          34 :     check_required_directory(&user_opts.socketdir, "PGSOCKETDIR", true,
     277          34 :                              "-s", _("sockets will be created"), false);
     278             : 
     279             : #ifdef WIN32
     280             : 
     281             :     /*
     282             :      * On Windows, initdb --sync-only will fail with a "Permission denied"
     283             :      * error on file pg_upgrade_utility.log if pg_upgrade is run inside the
     284             :      * new cluster directory, so we do a check here.
     285             :      */
     286             :     {
     287             :         char        cwd[MAXPGPATH],
     288             :                     new_cluster_pgdata[MAXPGPATH];
     289             : 
     290             :         strlcpy(new_cluster_pgdata, new_cluster.pgdata, MAXPGPATH);
     291             :         canonicalize_path(new_cluster_pgdata);
     292             : 
     293             :         if (!getcwd(cwd, MAXPGPATH))
     294             :             pg_fatal("could not determine current directory");
     295             :         canonicalize_path(cwd);
     296             :         if (path_is_prefix_of_path(new_cluster_pgdata, cwd))
     297             :             pg_fatal("cannot run pg_upgrade from inside the new cluster data directory on Windows");
     298             :     }
     299             : #endif
     300          34 : }
     301             : 
     302             : 
     303             : static void
     304           2 : usage(void)
     305             : {
     306           2 :     printf(_("pg_upgrade upgrades a PostgreSQL cluster to a different major version.\n\n"));
     307           2 :     printf(_("Usage:\n"));
     308           2 :     printf(_("  pg_upgrade [OPTION]...\n\n"));
     309           2 :     printf(_("Options:\n"));
     310           2 :     printf(_("  -b, --old-bindir=BINDIR       old cluster executable directory\n"));
     311           2 :     printf(_("  -B, --new-bindir=BINDIR       new cluster executable directory (default\n"
     312             :              "                                same directory as pg_upgrade)\n"));
     313           2 :     printf(_("  -c, --check                   check clusters only, don't change any data\n"));
     314           2 :     printf(_("  -d, --old-datadir=DATADIR     old cluster data directory\n"));
     315           2 :     printf(_("  -D, --new-datadir=DATADIR     new cluster data directory\n"));
     316           2 :     printf(_("  -j, --jobs=NUM                number of simultaneous processes or threads to use\n"));
     317           2 :     printf(_("  -k, --link                    link instead of copying files to new cluster\n"));
     318           2 :     printf(_("  -N, --no-sync                 do not wait for changes to be written safely to disk\n"));
     319           2 :     printf(_("  -o, --old-options=OPTIONS     old cluster options to pass to the server\n"));
     320           2 :     printf(_("  -O, --new-options=OPTIONS     new cluster options to pass to the server\n"));
     321           2 :     printf(_("  -p, --old-port=PORT           old cluster port number (default %d)\n"), old_cluster.port);
     322           2 :     printf(_("  -P, --new-port=PORT           new cluster port number (default %d)\n"), new_cluster.port);
     323           2 :     printf(_("  -r, --retain                  retain SQL and log files after success\n"));
     324           2 :     printf(_("  -s, --socketdir=DIR           socket directory to use (default current dir.)\n"));
     325           2 :     printf(_("  -U, --username=NAME           cluster superuser (default \"%s\")\n"), os_info.user);
     326           2 :     printf(_("  -v, --verbose                 enable verbose internal logging\n"));
     327           2 :     printf(_("  -V, --version                 display version information, then exit\n"));
     328           2 :     printf(_("  --clone                       clone instead of copying files to new cluster\n"));
     329           2 :     printf(_("  --copy                        copy files to new cluster (default)\n"));
     330           2 :     printf(_("  --copy-file-range             copy files to new cluster with copy_file_range\n"));
     331           2 :     printf(_("  --no-statistics               do not import statistics from old cluster\n"));
     332           2 :     printf(_("  --set-char-signedness=OPTION  set new cluster char signedness to \"signed\" or\n"
     333             :              "                                \"unsigned\"\n"));
     334           2 :     printf(_("  --swap                        move data directories to new cluster\n"));
     335           2 :     printf(_("  --sync-method=METHOD          set method for syncing files to disk\n"));
     336           2 :     printf(_("  -?, --help                    show this help, then exit\n"));
     337           2 :     printf(_("\n"
     338             :              "Before running pg_upgrade you must:\n"
     339             :              "  create a new database cluster (using the new version of initdb)\n"
     340             :              "  shutdown the postmaster servicing the old cluster\n"
     341             :              "  shutdown the postmaster servicing the new cluster\n"));
     342           2 :     printf(_("\n"
     343             :              "When you run pg_upgrade, you must provide the following information:\n"
     344             :              "  the data directory for the old cluster  (-d DATADIR)\n"
     345             :              "  the data directory for the new cluster  (-D DATADIR)\n"
     346             :              "  the \"bin\" directory for the old version (-b BINDIR)\n"
     347             :              "  the \"bin\" directory for the new version (-B BINDIR)\n"));
     348           2 :     printf(_("\n"
     349             :              "For example:\n"
     350             :              "  pg_upgrade -d oldCluster/data -D newCluster/data -b oldCluster/bin -B newCluster/bin\n"
     351             :              "or\n"));
     352             : #ifndef WIN32
     353           2 :     printf(_("  $ export PGDATAOLD=oldCluster/data\n"
     354             :              "  $ export PGDATANEW=newCluster/data\n"
     355             :              "  $ export PGBINOLD=oldCluster/bin\n"
     356             :              "  $ export PGBINNEW=newCluster/bin\n"
     357             :              "  $ pg_upgrade\n"));
     358             : #else
     359             :     printf(_("  C:\\> set PGDATAOLD=oldCluster/data\n"
     360             :              "  C:\\> set PGDATANEW=newCluster/data\n"
     361             :              "  C:\\> set PGBINOLD=oldCluster/bin\n"
     362             :              "  C:\\> set PGBINNEW=newCluster/bin\n"
     363             :              "  C:\\> pg_upgrade\n"));
     364             : #endif
     365           2 :     printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
     366           2 :     printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
     367           2 : }
     368             : 
     369             : 
     370             : /*
     371             :  * check_required_directory()
     372             :  *
     373             :  * Checks a directory option.
     374             :  *  dirpath       - the directory name supplied on the command line, or NULL
     375             :  *  envVarName    - the name of an environment variable to get if dirpath is NULL
     376             :  *  useCwd        - true if OK to default to CWD
     377             :  *  cmdLineOption - the command line option for this directory
     378             :  *  description   - a description of this directory option
     379             :  *  missingOk     - true if OK that both dirpath and envVarName are not existing
     380             :  *
     381             :  * We use the last two arguments to construct a meaningful error message if the
     382             :  * user hasn't provided the required directory name.
     383             :  */
     384             : static void
     385         170 : check_required_directory(char **dirpath, const char *envVarName, bool useCwd,
     386             :                          const char *cmdLineOption, const char *description,
     387             :                          bool missingOk)
     388             : {
     389         170 :     if (*dirpath == NULL || strlen(*dirpath) == 0)
     390             :     {
     391             :         const char *envVar;
     392             : 
     393           0 :         if ((envVar = getenv(envVarName)) && strlen(envVar))
     394           0 :             *dirpath = pg_strdup(envVar);
     395           0 :         else if (useCwd)
     396             :         {
     397             :             char        cwd[MAXPGPATH];
     398             : 
     399           0 :             if (!getcwd(cwd, MAXPGPATH))
     400           0 :                 pg_fatal("could not determine current directory");
     401           0 :             *dirpath = pg_strdup(cwd);
     402             :         }
     403           0 :         else if (missingOk)
     404           0 :             return;
     405             :         else
     406           0 :             pg_fatal("You must identify the directory where the %s.\n"
     407             :                      "Please use the %s command-line option or the %s environment variable.",
     408             :                      description, cmdLineOption, envVarName);
     409             :     }
     410             : 
     411             :     /*
     412             :      * Clean up the path, in particular trimming any trailing path separators,
     413             :      * because we construct paths by appending to this path.
     414             :      */
     415         170 :     canonicalize_path(*dirpath);
     416             : }
     417             : 
     418             : /*
     419             :  * adjust_data_dir
     420             :  *
     421             :  * If a configuration-only directory was specified, find the real data dir
     422             :  * by querying the running server.  This has limited checking because we
     423             :  * can't check for a running server because we can't find postmaster.pid.
     424             :  *
     425             :  * On entry, cluster->pgdata has been set from command line or env variable,
     426             :  * but cluster->pgconfig isn't set.  We fill both variables with corrected
     427             :  * values.
     428             :  */
     429             : void
     430          68 : adjust_data_dir(ClusterInfo *cluster)
     431             : {
     432             :     char        filename[MAXPGPATH];
     433             :     char        cmd[MAXPGPATH],
     434             :                 cmd_output[MAX_STRING];
     435             :     FILE       *fp,
     436             :                *output;
     437             :     int         rc;
     438             : 
     439             :     /* Initially assume config dir and data dir are the same */
     440          68 :     cluster->pgconfig = pg_strdup(cluster->pgdata);
     441             : 
     442             :     /* If there is no postgresql.conf, it can't be a config-only dir */
     443          68 :     snprintf(filename, sizeof(filename), "%s/postgresql.conf", cluster->pgconfig);
     444          68 :     if ((fp = fopen(filename, "r")) == NULL)
     445          68 :         return;
     446          68 :     fclose(fp);
     447             : 
     448             :     /* If PG_VERSION exists, it can't be a config-only dir */
     449          68 :     snprintf(filename, sizeof(filename), "%s/PG_VERSION", cluster->pgconfig);
     450          68 :     if ((fp = fopen(filename, "r")) != NULL)
     451             :     {
     452          68 :         fclose(fp);
     453          68 :         return;
     454             :     }
     455             : 
     456             :     /* Must be a configuration directory, so find the real data directory. */
     457             : 
     458           0 :     if (cluster == &old_cluster)
     459           0 :         prep_status("Finding the real data directory for the source cluster");
     460             :     else
     461           0 :         prep_status("Finding the real data directory for the target cluster");
     462             : 
     463             :     /*
     464             :      * We don't have a data directory yet, so we can't check the PG version,
     465             :      * so this might fail --- only works for PG 9.2+.   If this fails,
     466             :      * pg_upgrade will fail anyway because the data files will not be found.
     467             :      */
     468           0 :     snprintf(cmd, sizeof(cmd), "\"%s/postgres\" -D \"%s\" -C data_directory",
     469             :              cluster->bindir, cluster->pgconfig);
     470           0 :     fflush(NULL);
     471             : 
     472           0 :     if ((output = popen(cmd, "r")) == NULL ||
     473           0 :         fgets(cmd_output, sizeof(cmd_output), output) == NULL)
     474           0 :         pg_fatal("could not get data directory using %s: %m", cmd);
     475             : 
     476           0 :     rc = pclose(output);
     477           0 :     if (rc != 0)
     478           0 :         pg_fatal("could not get data directory using %s: %s",
     479             :                  cmd, wait_result_to_str(rc));
     480             : 
     481             :     /* strip trailing newline and carriage return */
     482           0 :     (void) pg_strip_crlf(cmd_output);
     483             : 
     484           0 :     cluster->pgdata = pg_strdup(cmd_output);
     485             : 
     486           0 :     check_ok();
     487             : }
     488             : 
     489             : 
     490             : /*
     491             :  * get_sock_dir
     492             :  *
     493             :  * Identify the socket directory to use for this cluster.  If we're doing
     494             :  * a live check (old cluster only), we need to find out where the postmaster
     495             :  * is listening.  Otherwise, we're going to put the socket into the current
     496             :  * directory.
     497             :  */
     498             : void
     499          60 : get_sock_dir(ClusterInfo *cluster)
     500             : {
     501             : #if !defined(WIN32)
     502          60 :     if (!user_opts.live_check || cluster == &new_cluster)
     503          60 :         cluster->sockdir = user_opts.socketdir;
     504             :     else
     505             :     {
     506             :         /*
     507             :          * If we are doing a live check, we will use the old cluster's Unix
     508             :          * domain socket directory so we can connect to the live server.
     509             :          */
     510           0 :         unsigned short orig_port = cluster->port;
     511             :         char        filename[MAXPGPATH],
     512             :                     line[MAXPGPATH];
     513             :         FILE       *fp;
     514             :         int         lineno;
     515             : 
     516           0 :         snprintf(filename, sizeof(filename), "%s/postmaster.pid",
     517             :                  cluster->pgdata);
     518           0 :         if ((fp = fopen(filename, "r")) == NULL)
     519           0 :             pg_fatal("could not open file \"%s\": %m", filename);
     520             : 
     521           0 :         for (lineno = 1;
     522             :              lineno <= Max(LOCK_FILE_LINE_PORT, LOCK_FILE_LINE_SOCKET_DIR);
     523           0 :              lineno++)
     524             :         {
     525           0 :             if (fgets(line, sizeof(line), fp) == NULL)
     526           0 :                 pg_fatal("could not read line %d from file \"%s\": %m",
     527             :                          lineno, filename);
     528             : 
     529             :             /* potentially overwrite user-supplied value */
     530           0 :             if (lineno == LOCK_FILE_LINE_PORT)
     531           0 :                 sscanf(line, "%hu", &old_cluster.port);
     532           0 :             if (lineno == LOCK_FILE_LINE_SOCKET_DIR)
     533             :             {
     534             :                 /* strip trailing newline and carriage return */
     535           0 :                 cluster->sockdir = pg_strdup(line);
     536           0 :                 (void) pg_strip_crlf(cluster->sockdir);
     537             :             }
     538             :         }
     539           0 :         fclose(fp);
     540             : 
     541             :         /* warn of port number correction */
     542           0 :         if (orig_port != DEF_PGUPORT && old_cluster.port != orig_port)
     543           0 :             pg_log(PG_WARNING, "user-supplied old port number %hu corrected to %hu",
     544           0 :                    orig_port, cluster->port);
     545             :     }
     546             : #else                           /* WIN32 */
     547             :     cluster->sockdir = NULL;
     548             : #endif
     549          60 : }

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