PostgreSQL的 initdb 源代码分析之十二

继续分析

    /* Now create all the text config files */
    setup_config();

将其展开：

实质就是，确定各种参数，分别写入 postgresql.conf 、pg_hba.conf、pg_indent.conf 文件。 

/*
 * set up all the config files
 */
static void
setup_config(void)
{
    char      **conflines;
    char        repltok[100];
    char        path[MAXPGPATH];

    fputs(_("creating configuration files ... "), stdout);
    fflush(stdout);

    /* postgresql.conf */

    conflines = readfile(conf_file);

    snprintf(repltok, sizeof(repltok), "max_connections = %d", n_connections);
    conflines = replace_token(conflines, "#max_connections = 100", repltok);

    if ((n_buffers * (BLCKSZ / 1024)) % 1024 == 0)
        snprintf(repltok, sizeof(repltok), "shared_buffers = %dMB",
                 (n_buffers * (BLCKSZ / 1024)) / 1024);
    else
        snprintf(repltok, sizeof(repltok), "shared_buffers = %dkB",
                 n_buffers * (BLCKSZ / 1024));
    conflines = replace_token(conflines, "#shared_buffers = 32MB", repltok);

#if DEF_PGPORT != 5432
    snprintf(repltok, sizeof(repltok), "#port = %d", DEF_PGPORT);
    conflines = replace_token(conflines, "#port = 5432", repltok);
#endif

    snprintf(repltok, sizeof(repltok), "lc_messages = '%s'",
             escape_quotes(lc_messages));
    conflines = replace_token(conflines, "#lc_messages = 'C'", repltok);

    snprintf(repltok, sizeof(repltok), "lc_monetary = '%s'",
             escape_quotes(lc_monetary));
    conflines = replace_token(conflines, "#lc_monetary = 'C'", repltok);

    snprintf(repltok, sizeof(repltok), "lc_numeric = '%s'",
             escape_quotes(lc_numeric));
    conflines = replace_token(conflines, "#lc_numeric = 'C'", repltok);

    snprintf(repltok, sizeof(repltok), "lc_time = '%s'",
             escape_quotes(lc_time));
    conflines = replace_token(conflines, "#lc_time = 'C'", repltok);

    switch (locale_date_order(lc_time))
    {
        case DATEORDER_YMD:
            strcpy(repltok, "datestyle = 'iso, ymd'");
            break;
        case DATEORDER_DMY:
            strcpy(repltok, "datestyle = 'iso, dmy'");
            break;
        case DATEORDER_MDY:
        default:
            strcpy(repltok, "datestyle = 'iso, mdy'");
            break;
    }
    conflines = replace_token(conflines, "#datestyle = 'iso, mdy'", repltok);

    snprintf(repltok, sizeof(repltok),
             "default_text_search_config = 'pg_catalog.%s'",
             escape_quotes(default_text_search_config));
    conflines = replace_token(conflines,
                         "#default_text_search_config = 'pg_catalog.simple'",
                              repltok);

    snprintf(path, sizeof(path), "%s/postgresql.conf", pg_data);

    writefile(path, conflines);

    chmod(path, S_IRUSR | S_IWUSR);

    free(conflines);


    /* pg_hba.conf */

    conflines = readfile(hba_file);

#ifndef HAVE_UNIX_SOCKETS
    conflines = filter_lines_with_token(conflines, "@remove-line-for-nolocal@");
#else
    conflines = replace_token(conflines, "@remove-line-for-nolocal@", "");
#endif

#ifdef HAVE_IPV6

    /*
     * Probe to see if there is really any platform support for IPv6, and
     * comment out the relevant pg_hba line if not.  This avoids runtime
     * warnings if getaddrinfo doesn't actually cope with IPv6.  Particularly
     * useful on Windows, where executables built on a machine with IPv6 may
     * have to run on a machine without.
     */
    {
        struct addrinfo *gai_result;
        struct addrinfo hints;
        int            err = 0;

#ifdef WIN32
        /* need to call WSAStartup before calling getaddrinfo */
        WSADATA        wsaData;

        err = WSAStartup(MAKEWORD(2, 2), &wsaData);
#endif

        /* for best results, this code should match parse_hba() */
        hints.ai_flags = AI_NUMERICHOST;
        hints.ai_family = PF_UNSPEC;
        hints.ai_socktype = 0;
        hints.ai_protocol = 0;
        hints.ai_addrlen = 0;
        hints.ai_canonname = NULL;
        hints.ai_addr = NULL;
        hints.ai_next = NULL;

        if (err != 0 ||
            getaddrinfo("::1", NULL, &hints, &gai_result) != 0)
            conflines = replace_token(conflines,
                               "host    all             all             ::1",
                             "#host    all             all             ::1");
    }
#else                            /* !HAVE_IPV6 */
    /* If we didn't compile IPV6 support at all, always comment it out */
    conflines = replace_token(conflines,
                              "host    all             all             ::1",
                              "#host    all             all             ::1");
#endif   /* HAVE_IPV6 */

    /* Replace default authentication methods */
    conflines = replace_token(conflines,
                              "@authmethod@",
                              authmethod);
    conflines = replace_token(conflines,
                              "@authmethodlocal@",
                              authmethodlocal);

    conflines = replace_token(conflines,
                              "@authcomment@",
                       strcmp(authmethod, "trust") ? "" : AUTHTRUST_WARNING);

    /* Replace username for replication */
    conflines = replace_token(conflines,
                              "@default_username@",
                              username);

    snprintf(path, sizeof(path), "%s/pg_hba.conf", pg_data);

    writefile(path, conflines);
    chmod(path, S_IRUSR | S_IWUSR);

    free(conflines);

    /* pg_ident.conf */

    conflines = readfile(ident_file);

    snprintf(path, sizeof(path), "%s/pg_ident.conf", pg_data);

    writefile(path, conflines);
    chmod(path, S_IRUSR | S_IWUSR);

    free(conflines);

    check_ok();
}