以bootstrap模式运行BKI脚本创建template1

static void bootstrap_template1(void) {
    PG_CMD_DECL; // #define PG_CMD_DECL  char cmd[MAXPGPATH]; FILE *cmdfd
    char      **line; char      **bki_lines;
    char        headerline[MAXPGPATH]; char        buf[64];
    printf(_("running bootstrap script ... ")); fflush(stdout);

    bki_lines = readfile(bki_file); // 读取bki文件
    /* Check that bki file appears to be of the right version */
    snprintf(headerline, sizeof(headerline), "# PostgreSQL %s\n", PG_MAJORVERSION);
    if (strcmp(headerline, *bki_lines) != 0) {
        pg_log_error("input file \"%s\" does not belong to PostgreSQL %s", bki_file, PG_VERSION);
        fprintf(stderr,_("Check your installation or specify the correct path using the option -L.\n")); exit(1);
    }

    /* Substitute for various symbols used in the BKI file */
    sprintf(buf, "%d", NAMEDATALEN);  // NAMEDATALEN为64
    bki_lines = replace_token(bki_lines, "NAMEDATALEN", buf);
    sprintf(buf, "%d", (int) sizeof(Pointer));
    bki_lines = replace_token(bki_lines, "SIZEOF_POINTER", buf);
    bki_lines = replace_token(bki_lines, "ALIGNOF_POINTER", (sizeof(Pointer) == 4) ? "i" : "d");
    bki_lines = replace_token(bki_lines, "FLOAT4PASSBYVAL", FLOAT4PASSBYVAL ? "true" : "false");
    bki_lines = replace_token(bki_lines, "FLOAT8PASSBYVAL", FLOAT8PASSBYVAL ? "true" : "false");
    bki_lines = replace_token(bki_lines, "POSTGRES", escape_quotes_bki(username));
    bki_lines = replace_token(bki_lines, "ENCODING", encodingid_to_string(encodingid));
    bki_lines = replace_token(bki_lines, "LC_COLLATE", escape_quotes_bki(lc_collate));
    bki_lines = replace_token(bki_lines, "LC_CTYPE", escape_quotes_bki(lc_ctype));

    // 向bootstrap传递正确得LC_xxx
    /* Pass correct LC_xxx environment to bootstrap.
     * The shell script arranged to restore the LC settings afterwards, but
     * there doesn't seem to be any compelling reason to do that. */
    snprintf(cmd, sizeof(cmd), "LC_COLLATE=%s", lc_collate); putenv(pg_strdup(cmd));
    snprintf(cmd, sizeof(cmd), "LC_CTYPE=%s", lc_ctype); putenv(pg_strdup(cmd));
    unsetenv("LC_ALL");
    /* Also ensure backend isn't confused by this environment var: */
    unsetenv("PGCLIENTENCODING");

    snprintf(cmd, sizeof(cmd),"\"%s\" --boot -x1 -X %u %s %s %s",backend_exec,wal_segment_size_mb * (1024 * 1024),data_checksums ? "-k" : "",boot_options,debug ? "-d 5" : "");

调用的命令：​​postgres --boot -x1 -X wal_segment_size_mb*(1024*1024) data_checksums ? "-k" : "" boot_options debug ? "-d 5" : ""​​

;
  for (line = bki_lines; *line != NULL; line++){
    PG_CMD_PUTS(*line);
    free(*line);
  }
  PG_CMD_CLOSE;
  free(bki_lines);
  check_ok();
}

#define PG_CMD_OPEN \
do {\
  cmdfd = popen_check(cmd,"w");\
  if (cmdfd == NULL)\
    exit(1);/* message already printed by popen_check */ \
} while (0)
#define PG_CMD_PUTS(line)\
do {\
  if (fputs(line, cmdfd) < 0 || fflush(cmdfd) < 0)\
    output_failed = true, output_errno = errno;\
} while (0)
#define PG_CMD_CLOSE \
do {\
  if (pclose_check(cmdfd))\
    exit(1);/* message already printed by pclose_check */ \
} while (0)

PostgreSQL数据库集簇初始化——initdb初始化数据库（bootstrap_template1）_bootstrap