1227 lines
32 KiB
Plaintext
1227 lines
32 KiB
Plaintext
/* -*-pgsql-c-*- */
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/*
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* Scanner for the configuration file
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*
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* Copyright (c) 2000-2020, PostgreSQL Global Development Group
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*
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* src/backend/utils/misc/guc-file.l
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*/
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%{
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#include "postgres.h"
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#include <ctype.h>
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#include <unistd.h>
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#include "mb/pg_wchar.h"
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#include "miscadmin.h"
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#include "storage/fd.h"
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#include "utils/guc.h"
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/*
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* flex emits a yy_fatal_error() function that it calls in response to
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* critical errors like malloc failure, file I/O errors, and detection of
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* internal inconsistency. That function prints a message and calls exit().
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* Mutate it to instead call our handler, which jumps out of the parser.
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*/
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#undef fprintf
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#define fprintf(file, fmt, msg) GUC_flex_fatal(msg)
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enum
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{
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GUC_ID = 1,
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GUC_STRING = 2,
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GUC_INTEGER = 3,
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GUC_REAL = 4,
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GUC_EQUALS = 5,
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GUC_UNQUOTED_STRING = 6,
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GUC_QUALIFIED_ID = 7,
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GUC_EOL = 99,
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GUC_ERROR = 100
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};
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static unsigned int ConfigFileLineno;
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static const char *GUC_flex_fatal_errmsg;
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static sigjmp_buf *GUC_flex_fatal_jmp;
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static void FreeConfigVariable(ConfigVariable *item);
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static void record_config_file_error(const char *errmsg,
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const char *config_file,
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int lineno,
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ConfigVariable **head_p,
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ConfigVariable **tail_p);
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static int GUC_flex_fatal(const char *msg);
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/* LCOV_EXCL_START */
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%}
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%option 8bit
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%option never-interactive
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%option nodefault
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%option noinput
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%option nounput
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%option noyywrap
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%option warn
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%option prefix="GUC_yy"
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SIGN ("-"|"+")
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DIGIT [0-9]
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HEXDIGIT [0-9a-fA-F]
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UNIT_LETTER [a-zA-Z]
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INTEGER {SIGN}?({DIGIT}+|0x{HEXDIGIT}+){UNIT_LETTER}*
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EXPONENT [Ee]{SIGN}?{DIGIT}+
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REAL {SIGN}?{DIGIT}*"."{DIGIT}*{EXPONENT}?
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LETTER [A-Za-z_\200-\377]
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LETTER_OR_DIGIT [A-Za-z_0-9\200-\377]
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ID {LETTER}{LETTER_OR_DIGIT}*
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QUALIFIED_ID {ID}"."{ID}
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UNQUOTED_STRING {LETTER}({LETTER_OR_DIGIT}|[-._:/])*
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STRING \'([^'\\\n]|\\.|\'\')*\'
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%%
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\n ConfigFileLineno++; return GUC_EOL;
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[ \t\r]+ /* eat whitespace */
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#.* /* eat comment (.* matches anything until newline) */
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{ID} return GUC_ID;
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{QUALIFIED_ID} return GUC_QUALIFIED_ID;
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{STRING} return GUC_STRING;
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{UNQUOTED_STRING} return GUC_UNQUOTED_STRING;
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{INTEGER} return GUC_INTEGER;
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{REAL} return GUC_REAL;
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= return GUC_EQUALS;
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. return GUC_ERROR;
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%%
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/* LCOV_EXCL_STOP */
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/*
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* Exported function to read and process the configuration file. The
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* parameter indicates in what context the file is being read --- either
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* postmaster startup (including standalone-backend startup) or SIGHUP.
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* All options mentioned in the configuration file are set to new values.
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* If a hard error occurs, no values will be changed. (There can also be
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* errors that prevent just one value from being changed.)
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*/
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void
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ProcessConfigFile(GucContext context)
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{
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int elevel;
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MemoryContext config_cxt;
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MemoryContext caller_cxt;
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/*
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* Config files are processed on startup (by the postmaster only) and on
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* SIGHUP (by the postmaster and its children)
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*/
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Assert((context == PGC_POSTMASTER && !IsUnderPostmaster) ||
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context == PGC_SIGHUP);
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/*
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* To avoid cluttering the log, only the postmaster bleats loudly about
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* problems with the config file.
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*/
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elevel = IsUnderPostmaster ? DEBUG2 : LOG;
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/*
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* This function is usually called within a process-lifespan memory
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* context. To ensure that any memory leaked during GUC processing does
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* not accumulate across repeated SIGHUP cycles, do the work in a private
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* context that we can free at exit.
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*/
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config_cxt = AllocSetContextCreate(CurrentMemoryContext,
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"config file processing",
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ALLOCSET_DEFAULT_SIZES);
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caller_cxt = MemoryContextSwitchTo(config_cxt);
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/*
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* Read and apply the config file. We don't need to examine the result.
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*/
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(void) ProcessConfigFileInternal(context, true, elevel);
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/* Clean up */
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MemoryContextSwitchTo(caller_cxt);
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MemoryContextDelete(config_cxt);
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}
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/*
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* This function handles both actual config file (re)loads and execution of
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* show_all_file_settings() (i.e., the pg_file_settings view). In the latter
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* case we don't apply any of the settings, but we make all the usual validity
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* checks, and we return the ConfigVariable list so that it can be printed out
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* by show_all_file_settings().
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*/
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static ConfigVariable *
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ProcessConfigFileInternal(GucContext context, bool applySettings, int elevel)
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{
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bool error = false;
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bool applying = false;
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const char *ConfFileWithError;
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ConfigVariable *item,
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*head,
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*tail;
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int i;
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/* Parse the main config file into a list of option names and values */
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ConfFileWithError = ConfigFileName;
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head = tail = NULL;
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if (!ParseConfigFile(ConfigFileName, true,
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NULL, 0, 0, elevel,
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&head, &tail))
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{
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/* Syntax error(s) detected in the file, so bail out */
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error = true;
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goto bail_out;
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}
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/*
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* Parse the PG_AUTOCONF_FILENAME file, if present, after the main file to
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* replace any parameters set by ALTER SYSTEM command. Because this file
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* is in the data directory, we can't read it until the DataDir has been
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* set.
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*/
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if (DataDir)
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{
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if (!ParseConfigFile(PG_AUTOCONF_FILENAME, false,
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NULL, 0, 0, elevel,
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&head, &tail))
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{
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/* Syntax error(s) detected in the file, so bail out */
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error = true;
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ConfFileWithError = PG_AUTOCONF_FILENAME;
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goto bail_out;
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}
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}
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else
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{
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/*
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* If DataDir is not set, the PG_AUTOCONF_FILENAME file cannot be
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* read. In this case, we don't want to accept any settings but
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* data_directory from postgresql.conf, because they might be
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* overwritten with settings in the PG_AUTOCONF_FILENAME file which
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* will be read later. OTOH, since data_directory isn't allowed in the
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* PG_AUTOCONF_FILENAME file, it will never be overwritten later.
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*/
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ConfigVariable *newlist = NULL;
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/*
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* Prune all items except the last "data_directory" from the list.
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*/
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for (item = head; item; item = item->next)
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{
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if (!item->ignore &&
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strcmp(item->name, "data_directory") == 0)
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newlist = item;
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}
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if (newlist)
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newlist->next = NULL;
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head = tail = newlist;
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/*
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* Quick exit if data_directory is not present in file.
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*
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* We need not do any further processing, in particular we don't set
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* PgReloadTime; that will be set soon by subsequent full loading of
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* the config file.
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*/
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if (head == NULL)
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goto bail_out;
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}
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/*
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* Mark all extant GUC variables as not present in the config file. We
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* need this so that we can tell below which ones have been removed from
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* the file since we last processed it.
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*/
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for (i = 0; i < num_guc_variables; i++)
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{
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struct config_generic *gconf = guc_variables[i];
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gconf->status &= ~GUC_IS_IN_FILE;
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}
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/*
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* Check if all the supplied option names are valid, as an additional
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* quasi-syntactic check on the validity of the config file. It is
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* important that the postmaster and all backends agree on the results of
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* this phase, else we will have strange inconsistencies about which
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* processes accept a config file update and which don't. Hence, unknown
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* custom variable names have to be accepted without complaint. For the
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* same reason, we don't attempt to validate the options' values here.
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*
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* In addition, the GUC_IS_IN_FILE flag is set on each existing GUC
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* variable mentioned in the file; and we detect duplicate entries in the
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* file and mark the earlier occurrences as ignorable.
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*/
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for (item = head; item; item = item->next)
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{
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struct config_generic *record;
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/* Ignore anything already marked as ignorable */
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if (item->ignore)
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continue;
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/*
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* Try to find the variable; but do not create a custom placeholder if
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* it's not there already.
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*/
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record = find_option(item->name, false, elevel);
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if (record)
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{
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/* If it's already marked, then this is a duplicate entry */
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if (record->status & GUC_IS_IN_FILE)
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{
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/*
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* Mark the earlier occurrence(s) as dead/ignorable. We could
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* avoid the O(N^2) behavior here with some additional state,
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* but it seems unlikely to be worth the trouble.
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*/
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ConfigVariable *pitem;
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for (pitem = head; pitem != item; pitem = pitem->next)
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{
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if (!pitem->ignore &&
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strcmp(pitem->name, item->name) == 0)
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pitem->ignore = true;
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}
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}
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/* Now mark it as present in file */
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record->status |= GUC_IS_IN_FILE;
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}
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else if (strchr(item->name, GUC_QUALIFIER_SEPARATOR) == NULL)
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{
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/* Invalid non-custom variable, so complain */
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ereport(elevel,
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(errcode(ERRCODE_UNDEFINED_OBJECT),
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errmsg("unrecognized configuration parameter \"%s\" in file \"%s\" line %u",
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item->name,
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item->filename, item->sourceline)));
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item->errmsg = pstrdup("unrecognized configuration parameter");
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error = true;
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ConfFileWithError = item->filename;
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}
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}
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/*
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* If we've detected any errors so far, we don't want to risk applying any
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* changes.
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*/
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if (error)
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goto bail_out;
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/* Otherwise, set flag that we're beginning to apply changes */
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applying = true;
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/*
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* Check for variables having been removed from the config file, and
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* revert their reset values (and perhaps also effective values) to the
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* boot-time defaults. If such a variable can't be changed after startup,
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* report that and continue.
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*/
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for (i = 0; i < num_guc_variables; i++)
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{
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struct config_generic *gconf = guc_variables[i];
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GucStack *stack;
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if (gconf->reset_source != PGC_S_FILE ||
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(gconf->status & GUC_IS_IN_FILE))
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continue;
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if (gconf->context < PGC_SIGHUP)
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{
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ereport(elevel,
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(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
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errmsg("parameter \"%s\" cannot be changed without restarting the server",
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gconf->name)));
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record_config_file_error(psprintf("parameter \"%s\" cannot be changed without restarting the server",
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gconf->name),
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NULL, 0,
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&head, &tail);
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error = true;
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continue;
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}
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/* No more to do if we're just doing show_all_file_settings() */
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if (!applySettings)
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continue;
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/*
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* Reset any "file" sources to "default", else set_config_option will
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* not override those settings.
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*/
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if (gconf->reset_source == PGC_S_FILE)
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gconf->reset_source = PGC_S_DEFAULT;
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if (gconf->source == PGC_S_FILE)
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gconf->source = PGC_S_DEFAULT;
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for (stack = gconf->stack; stack; stack = stack->prev)
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{
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if (stack->source == PGC_S_FILE)
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stack->source = PGC_S_DEFAULT;
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}
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/* Now we can re-apply the wired-in default (i.e., the boot_val) */
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if (set_config_option(gconf->name, NULL,
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context, PGC_S_DEFAULT,
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GUC_ACTION_SET, true, 0, false) > 0)
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{
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/* Log the change if appropriate */
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if (context == PGC_SIGHUP)
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ereport(elevel,
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(errmsg("parameter \"%s\" removed from configuration file, reset to default",
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gconf->name)));
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}
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}
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/*
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* Restore any variables determined by environment variables or
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* dynamically-computed defaults. This is a no-op except in the case
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* where one of these had been in the config file and is now removed.
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*
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* In particular, we *must not* do this during the postmaster's initial
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* loading of the file, since the timezone functions in particular should
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* be run only after initialization is complete.
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*
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* XXX this is an unmaintainable crock, because we have to know how to set
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* (or at least what to call to set) every variable that could potentially
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* have PGC_S_DYNAMIC_DEFAULT or PGC_S_ENV_VAR source. However, there's no
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* time to redesign it for 9.1.
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*/
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if (context == PGC_SIGHUP && applySettings)
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{
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InitializeGUCOptionsFromEnvironment();
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pg_timezone_abbrev_initialize();
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/* this selects SQL_ASCII in processes not connected to a database */
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SetConfigOption("client_encoding", GetDatabaseEncodingName(),
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PGC_BACKEND, PGC_S_DYNAMIC_DEFAULT);
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}
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/*
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* Now apply the values from the config file.
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*/
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for (item = head; item; item = item->next)
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{
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char *pre_value = NULL;
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int scres;
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/* Ignore anything marked as ignorable */
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if (item->ignore)
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continue;
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/* In SIGHUP cases in the postmaster, we want to report changes */
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if (context == PGC_SIGHUP && applySettings && !IsUnderPostmaster)
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{
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const char *preval = GetConfigOption(item->name, true, false);
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/* If option doesn't exist yet or is NULL, treat as empty string */
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if (!preval)
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preval = "";
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/* must dup, else might have dangling pointer below */
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pre_value = pstrdup(preval);
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}
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scres = set_config_option(item->name, item->value,
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context, PGC_S_FILE,
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GUC_ACTION_SET, applySettings, 0, false);
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if (scres > 0)
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{
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/* variable was updated, so log the change if appropriate */
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if (pre_value)
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{
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const char *post_value = GetConfigOption(item->name, true, false);
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if (!post_value)
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post_value = "";
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if (strcmp(pre_value, post_value) != 0)
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ereport(elevel,
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(errmsg("parameter \"%s\" changed to \"%s\"",
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item->name, item->value)));
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}
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item->applied = true;
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}
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else if (scres == 0)
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{
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error = true;
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item->errmsg = pstrdup("setting could not be applied");
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ConfFileWithError = item->filename;
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}
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else
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{
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/* no error, but variable's active value was not changed */
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item->applied = true;
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}
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/*
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* We should update source location unless there was an error, since
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* even if the active value didn't change, the reset value might have.
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* (In the postmaster, there won't be a difference, but it does matter
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* in backends.)
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*/
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if (scres != 0 && applySettings)
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set_config_sourcefile(item->name, item->filename,
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item->sourceline);
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if (pre_value)
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pfree(pre_value);
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}
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/* Remember when we last successfully loaded the config file. */
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if (applySettings)
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PgReloadTime = GetCurrentTimestamp();
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bail_out:
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if (error && applySettings)
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{
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/* During postmaster startup, any error is fatal */
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if (context == PGC_POSTMASTER)
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ereport(ERROR,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("configuration file \"%s\" contains errors",
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ConfFileWithError)));
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else if (applying)
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ereport(elevel,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("configuration file \"%s\" contains errors; unaffected changes were applied",
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ConfFileWithError)));
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else
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ereport(elevel,
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(errcode(ERRCODE_CONFIG_FILE_ERROR),
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errmsg("configuration file \"%s\" contains errors; no changes were applied",
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ConfFileWithError)));
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}
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/* Successful or otherwise, return the collected data list */
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return head;
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}
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/*
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* Given a configuration file or directory location that may be a relative
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* path, return an absolute one. We consider the location to be relative to
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* the directory holding the calling file, or to DataDir if no calling file.
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*/
|
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static char *
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AbsoluteConfigLocation(const char *location, const char *calling_file)
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{
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char abs_path[MAXPGPATH];
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|
|
if (is_absolute_path(location))
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return pstrdup(location);
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else
|
|
{
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|
if (calling_file != NULL)
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|
{
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strlcpy(abs_path, calling_file, sizeof(abs_path));
|
|
get_parent_directory(abs_path);
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|
join_path_components(abs_path, abs_path, location);
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|
canonicalize_path(abs_path);
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|
}
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|
else
|
|
{
|
|
AssertState(DataDir);
|
|
join_path_components(abs_path, DataDir, location);
|
|
canonicalize_path(abs_path);
|
|
}
|
|
return pstrdup(abs_path);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Read and parse a single configuration file. This function recurses
|
|
* to handle "include" directives.
|
|
*
|
|
* If "strict" is true, treat failure to open the config file as an error,
|
|
* otherwise just skip the file.
|
|
*
|
|
* calling_file/calling_lineno identify the source of the request.
|
|
* Pass NULL/0 if not recursing from an inclusion request.
|
|
*
|
|
* See ParseConfigFp for further details. This one merely adds opening the
|
|
* config file rather than working from a caller-supplied file descriptor,
|
|
* and absolute-ifying the path name if necessary.
|
|
*/
|
|
bool
|
|
ParseConfigFile(const char *config_file, bool strict,
|
|
const char *calling_file, int calling_lineno,
|
|
int depth, int elevel,
|
|
ConfigVariable **head_p,
|
|
ConfigVariable **tail_p)
|
|
{
|
|
char *abs_path;
|
|
bool OK = true;
|
|
FILE *fp;
|
|
|
|
/*
|
|
* Reject file name that is all-blank (including empty), as that leads to
|
|
* confusion --- we'd try to read the containing directory as a file.
|
|
*/
|
|
if (strspn(config_file, " \t\r\n") == strlen(config_file))
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("empty configuration file name: \"%s\"",
|
|
config_file)));
|
|
record_config_file_error("empty configuration file name",
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Reject too-deep include nesting depth. This is just a safety check to
|
|
* avoid dumping core due to stack overflow if an include file loops back
|
|
* to itself. The maximum nesting depth is pretty arbitrary.
|
|
*/
|
|
if (depth > 10)
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
|
|
errmsg("could not open configuration file \"%s\": maximum nesting depth exceeded",
|
|
config_file)));
|
|
record_config_file_error("nesting depth exceeded",
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
return false;
|
|
}
|
|
|
|
abs_path = AbsoluteConfigLocation(config_file, calling_file);
|
|
|
|
/*
|
|
* Reject direct recursion. Indirect recursion is also possible, but it's
|
|
* harder to detect and so doesn't seem worth the trouble. (We test at
|
|
* this step because the canonicalization done by AbsoluteConfigLocation
|
|
* makes it more likely that a simple strcmp comparison will match.)
|
|
*/
|
|
if (calling_file && strcmp(abs_path, calling_file) == 0)
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("configuration file recursion in \"%s\"",
|
|
calling_file)));
|
|
record_config_file_error("configuration file recursion",
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
pfree(abs_path);
|
|
return false;
|
|
}
|
|
|
|
fp = AllocateFile(abs_path, "r");
|
|
if (!fp)
|
|
{
|
|
if (strict)
|
|
{
|
|
ereport(elevel,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open configuration file \"%s\": %m",
|
|
abs_path)));
|
|
record_config_file_error(psprintf("could not open file \"%s\"",
|
|
abs_path),
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
OK = false;
|
|
}
|
|
else
|
|
{
|
|
ereport(LOG,
|
|
(errmsg("skipping missing configuration file \"%s\"",
|
|
abs_path)));
|
|
}
|
|
goto cleanup;
|
|
}
|
|
|
|
OK = ParseConfigFp(fp, abs_path, depth, elevel, head_p, tail_p);
|
|
|
|
cleanup:
|
|
if (fp)
|
|
FreeFile(fp);
|
|
pfree(abs_path);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/*
|
|
* Capture an error message in the ConfigVariable list returned by
|
|
* config file parsing.
|
|
*/
|
|
static void
|
|
record_config_file_error(const char *errmsg,
|
|
const char *config_file,
|
|
int lineno,
|
|
ConfigVariable **head_p,
|
|
ConfigVariable **tail_p)
|
|
{
|
|
ConfigVariable *item;
|
|
|
|
item = palloc(sizeof *item);
|
|
item->name = NULL;
|
|
item->value = NULL;
|
|
item->errmsg = pstrdup(errmsg);
|
|
item->filename = config_file ? pstrdup(config_file) : NULL;
|
|
item->sourceline = lineno;
|
|
item->ignore = true;
|
|
item->applied = false;
|
|
item->next = NULL;
|
|
if (*head_p == NULL)
|
|
*head_p = item;
|
|
else
|
|
(*tail_p)->next = item;
|
|
*tail_p = item;
|
|
}
|
|
|
|
/*
|
|
* Flex fatal errors bring us here. Stash the error message and jump back to
|
|
* ParseConfigFp(). Assume all msg arguments point to string constants; this
|
|
* holds for flex 2.5.31 (earliest we support) and flex 2.5.35 (latest as of
|
|
* this writing). Otherwise, we would need to copy the message.
|
|
*
|
|
* We return "int" since this takes the place of calls to fprintf().
|
|
*/
|
|
static int
|
|
GUC_flex_fatal(const char *msg)
|
|
{
|
|
GUC_flex_fatal_errmsg = msg;
|
|
siglongjmp(*GUC_flex_fatal_jmp, 1);
|
|
return 0; /* keep compiler quiet */
|
|
}
|
|
|
|
/*
|
|
* Read and parse a single configuration file. This function recurses
|
|
* to handle "include" directives.
|
|
*
|
|
* Input parameters:
|
|
* fp: file pointer from AllocateFile for the configuration file to parse
|
|
* config_file: absolute or relative path name of the configuration file
|
|
* depth: recursion depth (should be 0 in the outermost call)
|
|
* elevel: error logging level to use
|
|
* Input/Output parameters:
|
|
* head_p, tail_p: head and tail of linked list of name/value pairs
|
|
*
|
|
* *head_p and *tail_p must be initialized, either to NULL or valid pointers
|
|
* to a ConfigVariable list, before calling the outer recursion level. Any
|
|
* name-value pairs read from the input file(s) will be appended to the list.
|
|
* Error reports will also be appended to the list, if elevel < ERROR.
|
|
*
|
|
* Returns TRUE if successful, FALSE if an error occurred. The error has
|
|
* already been ereport'd, it is only necessary for the caller to clean up
|
|
* its own state and release the ConfigVariable list.
|
|
*
|
|
* Note: if elevel >= ERROR then an error will not return control to the
|
|
* caller, so there is no need to check the return value in that case.
|
|
*
|
|
* Note: this function is used to parse not only postgresql.conf, but
|
|
* various other configuration files that use the same "name = value"
|
|
* syntax. Hence, do not do anything here or in the subsidiary routines
|
|
* ParseConfigFile/ParseConfigDirectory that assumes we are processing
|
|
* GUCs specifically.
|
|
*/
|
|
bool
|
|
ParseConfigFp(FILE *fp, const char *config_file, int depth, int elevel,
|
|
ConfigVariable **head_p, ConfigVariable **tail_p)
|
|
{
|
|
volatile bool OK = true;
|
|
unsigned int save_ConfigFileLineno = ConfigFileLineno;
|
|
sigjmp_buf *save_GUC_flex_fatal_jmp = GUC_flex_fatal_jmp;
|
|
sigjmp_buf flex_fatal_jmp;
|
|
volatile YY_BUFFER_STATE lex_buffer = NULL;
|
|
int errorcount;
|
|
int token;
|
|
|
|
if (sigsetjmp(flex_fatal_jmp, 1) == 0)
|
|
GUC_flex_fatal_jmp = &flex_fatal_jmp;
|
|
else
|
|
{
|
|
/*
|
|
* Regain control after a fatal, internal flex error. It may have
|
|
* corrupted parser state. Consequently, abandon the file, but trust
|
|
* that the state remains sane enough for yy_delete_buffer().
|
|
*/
|
|
elog(elevel, "%s at file \"%s\" line %u",
|
|
GUC_flex_fatal_errmsg, config_file, ConfigFileLineno);
|
|
record_config_file_error(GUC_flex_fatal_errmsg,
|
|
config_file, ConfigFileLineno,
|
|
head_p, tail_p);
|
|
OK = false;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Parse
|
|
*/
|
|
ConfigFileLineno = 1;
|
|
errorcount = 0;
|
|
|
|
lex_buffer = yy_create_buffer(fp, YY_BUF_SIZE);
|
|
yy_switch_to_buffer(lex_buffer);
|
|
|
|
/* This loop iterates once per logical line */
|
|
while ((token = yylex()))
|
|
{
|
|
char *opt_name = NULL;
|
|
char *opt_value = NULL;
|
|
ConfigVariable *item;
|
|
|
|
if (token == GUC_EOL) /* empty or comment line */
|
|
continue;
|
|
|
|
/* first token on line is option name */
|
|
if (token != GUC_ID && token != GUC_QUALIFIED_ID)
|
|
goto parse_error;
|
|
opt_name = pstrdup(yytext);
|
|
|
|
/* next we have an optional equal sign; discard if present */
|
|
token = yylex();
|
|
if (token == GUC_EQUALS)
|
|
token = yylex();
|
|
|
|
/* now we must have the option value */
|
|
if (token != GUC_ID &&
|
|
token != GUC_STRING &&
|
|
token != GUC_INTEGER &&
|
|
token != GUC_REAL &&
|
|
token != GUC_UNQUOTED_STRING)
|
|
goto parse_error;
|
|
if (token == GUC_STRING) /* strip quotes and escapes */
|
|
opt_value = DeescapeQuotedString(yytext);
|
|
else
|
|
opt_value = pstrdup(yytext);
|
|
|
|
/* now we'd like an end of line, or possibly EOF */
|
|
token = yylex();
|
|
if (token != GUC_EOL)
|
|
{
|
|
if (token != 0)
|
|
goto parse_error;
|
|
/* treat EOF like \n for line numbering purposes, cf bug 4752 */
|
|
ConfigFileLineno++;
|
|
}
|
|
|
|
/* OK, process the option name and value */
|
|
if (guc_name_compare(opt_name, "include_dir") == 0)
|
|
{
|
|
/*
|
|
* An include_dir directive isn't a variable and should be
|
|
* processed immediately.
|
|
*/
|
|
if (!ParseConfigDirectory(opt_value,
|
|
config_file, ConfigFileLineno - 1,
|
|
depth + 1, elevel,
|
|
head_p, tail_p))
|
|
OK = false;
|
|
yy_switch_to_buffer(lex_buffer);
|
|
pfree(opt_name);
|
|
pfree(opt_value);
|
|
}
|
|
else if (guc_name_compare(opt_name, "include_if_exists") == 0)
|
|
{
|
|
/*
|
|
* An include_if_exists directive isn't a variable and should be
|
|
* processed immediately.
|
|
*/
|
|
if (!ParseConfigFile(opt_value, false,
|
|
config_file, ConfigFileLineno - 1,
|
|
depth + 1, elevel,
|
|
head_p, tail_p))
|
|
OK = false;
|
|
yy_switch_to_buffer(lex_buffer);
|
|
pfree(opt_name);
|
|
pfree(opt_value);
|
|
}
|
|
else if (guc_name_compare(opt_name, "include") == 0)
|
|
{
|
|
/*
|
|
* An include directive isn't a variable and should be processed
|
|
* immediately.
|
|
*/
|
|
if (!ParseConfigFile(opt_value, true,
|
|
config_file, ConfigFileLineno - 1,
|
|
depth + 1, elevel,
|
|
head_p, tail_p))
|
|
OK = false;
|
|
yy_switch_to_buffer(lex_buffer);
|
|
pfree(opt_name);
|
|
pfree(opt_value);
|
|
}
|
|
else
|
|
{
|
|
/* ordinary variable, append to list */
|
|
item = palloc(sizeof *item);
|
|
item->name = opt_name;
|
|
item->value = opt_value;
|
|
item->errmsg = NULL;
|
|
item->filename = pstrdup(config_file);
|
|
item->sourceline = ConfigFileLineno - 1;
|
|
item->ignore = false;
|
|
item->applied = false;
|
|
item->next = NULL;
|
|
if (*head_p == NULL)
|
|
*head_p = item;
|
|
else
|
|
(*tail_p)->next = item;
|
|
*tail_p = item;
|
|
}
|
|
|
|
/* break out of loop if read EOF, else loop for next line */
|
|
if (token == 0)
|
|
break;
|
|
continue;
|
|
|
|
parse_error:
|
|
/* release storage if we allocated any on this line */
|
|
if (opt_name)
|
|
pfree(opt_name);
|
|
if (opt_value)
|
|
pfree(opt_value);
|
|
|
|
/* report the error */
|
|
if (token == GUC_EOL || token == 0)
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("syntax error in file \"%s\" line %u, near end of line",
|
|
config_file, ConfigFileLineno - 1)));
|
|
record_config_file_error("syntax error",
|
|
config_file, ConfigFileLineno - 1,
|
|
head_p, tail_p);
|
|
}
|
|
else
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("syntax error in file \"%s\" line %u, near token \"%s\"",
|
|
config_file, ConfigFileLineno, yytext)));
|
|
record_config_file_error("syntax error",
|
|
config_file, ConfigFileLineno,
|
|
head_p, tail_p);
|
|
}
|
|
OK = false;
|
|
errorcount++;
|
|
|
|
/*
|
|
* To avoid producing too much noise when fed a totally bogus file,
|
|
* give up after 100 syntax errors per file (an arbitrary number).
|
|
* Also, if we're only logging the errors at DEBUG level anyway, might
|
|
* as well give up immediately. (This prevents postmaster children
|
|
* from bloating the logs with duplicate complaints.)
|
|
*/
|
|
if (errorcount >= 100 || elevel <= DEBUG1)
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
|
|
errmsg("too many syntax errors found, abandoning file \"%s\"",
|
|
config_file)));
|
|
break;
|
|
}
|
|
|
|
/* resync to next end-of-line or EOF */
|
|
while (token != GUC_EOL && token != 0)
|
|
token = yylex();
|
|
/* break out of loop on EOF */
|
|
if (token == 0)
|
|
break;
|
|
}
|
|
|
|
cleanup:
|
|
yy_delete_buffer(lex_buffer);
|
|
/* Each recursion level must save and restore these static variables. */
|
|
ConfigFileLineno = save_ConfigFileLineno;
|
|
GUC_flex_fatal_jmp = save_GUC_flex_fatal_jmp;
|
|
return OK;
|
|
}
|
|
|
|
/*
|
|
* Read and parse all config files in a subdirectory in alphabetical order
|
|
*
|
|
* includedir is the absolute or relative path to the subdirectory to scan.
|
|
*
|
|
* calling_file/calling_lineno identify the source of the request.
|
|
* Pass NULL/0 if not recursing from an inclusion request.
|
|
*
|
|
* See ParseConfigFp for further details.
|
|
*/
|
|
bool
|
|
ParseConfigDirectory(const char *includedir,
|
|
const char *calling_file, int calling_lineno,
|
|
int depth, int elevel,
|
|
ConfigVariable **head_p,
|
|
ConfigVariable **tail_p)
|
|
{
|
|
char *directory;
|
|
DIR *d;
|
|
struct dirent *de;
|
|
char **filenames;
|
|
int num_filenames;
|
|
int size_filenames;
|
|
bool status;
|
|
|
|
/*
|
|
* Reject directory name that is all-blank (including empty), as that
|
|
* leads to confusion --- we'd read the containing directory, typically
|
|
* resulting in recursive inclusion of the same file(s).
|
|
*/
|
|
if (strspn(includedir, " \t\r\n") == strlen(includedir))
|
|
{
|
|
ereport(elevel,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("empty configuration directory name: \"%s\"",
|
|
includedir)));
|
|
record_config_file_error("empty configuration directory name",
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* We don't check for recursion or too-deep nesting depth here; the
|
|
* subsequent calls to ParseConfigFile will take care of that.
|
|
*/
|
|
|
|
directory = AbsoluteConfigLocation(includedir, calling_file);
|
|
d = AllocateDir(directory);
|
|
if (d == NULL)
|
|
{
|
|
ereport(elevel,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not open configuration directory \"%s\": %m",
|
|
directory)));
|
|
record_config_file_error(psprintf("could not open directory \"%s\"",
|
|
directory),
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
status = false;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Read the directory and put the filenames in an array, so we can sort
|
|
* them prior to processing the contents.
|
|
*/
|
|
size_filenames = 32;
|
|
filenames = (char **) palloc(size_filenames * sizeof(char *));
|
|
num_filenames = 0;
|
|
|
|
while ((de = ReadDir(d, directory)) != NULL)
|
|
{
|
|
struct stat st;
|
|
char filename[MAXPGPATH];
|
|
|
|
/*
|
|
* Only parse files with names ending in ".conf". Explicitly reject
|
|
* files starting with ".". This excludes things like "." and "..",
|
|
* as well as typical hidden files, backup files, and editor debris.
|
|
*/
|
|
if (strlen(de->d_name) < 6)
|
|
continue;
|
|
if (de->d_name[0] == '.')
|
|
continue;
|
|
if (strcmp(de->d_name + strlen(de->d_name) - 5, ".conf") != 0)
|
|
continue;
|
|
|
|
join_path_components(filename, directory, de->d_name);
|
|
canonicalize_path(filename);
|
|
if (stat(filename, &st) == 0)
|
|
{
|
|
if (!S_ISDIR(st.st_mode))
|
|
{
|
|
/* Add file to array, increasing its size in blocks of 32 */
|
|
if (num_filenames >= size_filenames)
|
|
{
|
|
size_filenames += 32;
|
|
filenames = (char **) repalloc(filenames,
|
|
size_filenames * sizeof(char *));
|
|
}
|
|
filenames[num_filenames] = pstrdup(filename);
|
|
num_filenames++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* stat does not care about permissions, so the most likely reason
|
|
* a file can't be accessed now is if it was removed between the
|
|
* directory listing and now.
|
|
*/
|
|
ereport(elevel,
|
|
(errcode_for_file_access(),
|
|
errmsg("could not stat file \"%s\": %m",
|
|
filename)));
|
|
record_config_file_error(psprintf("could not stat file \"%s\"",
|
|
filename),
|
|
calling_file, calling_lineno,
|
|
head_p, tail_p);
|
|
status = false;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (num_filenames > 0)
|
|
{
|
|
int i;
|
|
|
|
qsort(filenames, num_filenames, sizeof(char *), pg_qsort_strcmp);
|
|
for (i = 0; i < num_filenames; i++)
|
|
{
|
|
if (!ParseConfigFile(filenames[i], true,
|
|
calling_file, calling_lineno,
|
|
depth, elevel,
|
|
head_p, tail_p))
|
|
{
|
|
status = false;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
status = true;
|
|
|
|
cleanup:
|
|
if (d)
|
|
FreeDir(d);
|
|
pfree(directory);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Free a list of ConfigVariables, including the names and the values
|
|
*/
|
|
void
|
|
FreeConfigVariables(ConfigVariable *list)
|
|
{
|
|
ConfigVariable *item;
|
|
|
|
item = list;
|
|
while (item)
|
|
{
|
|
ConfigVariable *next = item->next;
|
|
|
|
FreeConfigVariable(item);
|
|
item = next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free a single ConfigVariable
|
|
*/
|
|
static void
|
|
FreeConfigVariable(ConfigVariable *item)
|
|
{
|
|
if (item->name)
|
|
pfree(item->name);
|
|
if (item->value)
|
|
pfree(item->value);
|
|
if (item->errmsg)
|
|
pfree(item->errmsg);
|
|
if (item->filename)
|
|
pfree(item->filename);
|
|
pfree(item);
|
|
}
|
|
|
|
|
|
/*
|
|
* DeescapeQuotedString
|
|
*
|
|
* Strip the quotes surrounding the given string, and collapse any embedded
|
|
* '' sequences and backslash escapes.
|
|
*
|
|
* The string returned is palloc'd and should eventually be pfree'd by the
|
|
* caller.
|
|
*
|
|
* This is exported because it is also used by the bootstrap scanner.
|
|
*/
|
|
char *
|
|
DeescapeQuotedString(const char *s)
|
|
{
|
|
char *newStr;
|
|
int len,
|
|
i,
|
|
j;
|
|
|
|
/* We just Assert that there are leading and trailing quotes */
|
|
Assert(s != NULL && s[0] == '\'');
|
|
len = strlen(s);
|
|
Assert(len >= 2);
|
|
Assert(s[len - 1] == '\'');
|
|
|
|
/* Skip the leading quote; we'll handle the trailing quote below */
|
|
s++, len--;
|
|
|
|
/* Since len still includes trailing quote, this is enough space */
|
|
newStr = palloc(len);
|
|
|
|
for (i = 0, j = 0; i < len; i++)
|
|
{
|
|
if (s[i] == '\\')
|
|
{
|
|
i++;
|
|
switch (s[i])
|
|
{
|
|
case 'b':
|
|
newStr[j] = '\b';
|
|
break;
|
|
case 'f':
|
|
newStr[j] = '\f';
|
|
break;
|
|
case 'n':
|
|
newStr[j] = '\n';
|
|
break;
|
|
case 'r':
|
|
newStr[j] = '\r';
|
|
break;
|
|
case 't':
|
|
newStr[j] = '\t';
|
|
break;
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
{
|
|
int k;
|
|
long octVal = 0;
|
|
|
|
for (k = 0;
|
|
s[i + k] >= '0' && s[i + k] <= '7' && k < 3;
|
|
k++)
|
|
octVal = (octVal << 3) + (s[i + k] - '0');
|
|
i += k - 1;
|
|
newStr[j] = ((char) octVal);
|
|
}
|
|
break;
|
|
default:
|
|
newStr[j] = s[i];
|
|
break;
|
|
} /* switch */
|
|
}
|
|
else if (s[i] == '\'' && s[i + 1] == '\'')
|
|
{
|
|
/* doubled quote becomes just one quote */
|
|
newStr[j] = s[++i];
|
|
}
|
|
else
|
|
newStr[j] = s[i];
|
|
j++;
|
|
}
|
|
|
|
/* We copied the ending quote to newStr, so replace with \0 */
|
|
Assert(j > 0 && j <= len);
|
|
newStr[--j] = '\0';
|
|
|
|
return newStr;
|
|
}
|