mirror of
https://github.com/postgres/postgres.git
synced 2025-04-25 21:42:33 +03:00
9a374b77fb
Get rid of the separate "FATAL" log level, as it was applied so inconsistently as to be meaningless. This mostly involves s/pg_log_fatal/pg_log_error/g. Create a macro pg_fatal() to handle the common use-case of pg_log_error() immediately followed by exit(1). Various modules had already invented either this or equivalent macros; standardize on pg_fatal() and apply it where possible. Invent the ability to add "detail" and "hint" messages to a frontend message, much as we have long had in the backend. Except where rewording was needed to convert existing coding to detail/hint style, I have (mostly) resisted the temptation to change existing message wording. Patch by me. Design and patch reviewed at various stages by Robert Haas, Kyotaro Horiguchi, Peter Eisentraut and Daniel Gustafsson. Discussion: https://postgr.es/m/1363732.1636496441@sss.pgh.pa.us
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* archive.c
|
|
* Routines to access WAL archives from frontend
|
|
*
|
|
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
*
|
|
*
|
|
* IDENTIFICATION
|
|
* src/fe_utils/archive.c
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "postgres_fe.h"
|
|
|
|
#include <unistd.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "access/xlog_internal.h"
|
|
#include "common/archive.h"
|
|
#include "common/logging.h"
|
|
#include "fe_utils/archive.h"
|
|
|
|
|
|
/*
|
|
* RestoreArchivedFile
|
|
*
|
|
* Attempt to retrieve the specified file from off-line archival storage.
|
|
* If successful, return a file descriptor of the restored file, else
|
|
* return -1.
|
|
*
|
|
* For fixed-size files, the caller may pass the expected size as an
|
|
* additional crosscheck on successful recovery. If the file size is not
|
|
* known, set expectedSize = 0.
|
|
*/
|
|
int
|
|
RestoreArchivedFile(const char *path, const char *xlogfname,
|
|
off_t expectedSize, const char *restoreCommand)
|
|
{
|
|
char xlogpath[MAXPGPATH];
|
|
char *xlogRestoreCmd;
|
|
int rc;
|
|
struct stat stat_buf;
|
|
|
|
snprintf(xlogpath, MAXPGPATH, "%s/" XLOGDIR "/%s", path, xlogfname);
|
|
|
|
xlogRestoreCmd = BuildRestoreCommand(restoreCommand, xlogpath,
|
|
xlogfname, NULL);
|
|
if (xlogRestoreCmd == NULL)
|
|
pg_fatal("cannot use restore_command with %%r placeholder");
|
|
|
|
/*
|
|
* Execute restore_command, which should copy the missing file from
|
|
* archival storage.
|
|
*/
|
|
rc = system(xlogRestoreCmd);
|
|
pfree(xlogRestoreCmd);
|
|
|
|
if (rc == 0)
|
|
{
|
|
/*
|
|
* Command apparently succeeded, but let's make sure the file is
|
|
* really there now and has the correct size.
|
|
*/
|
|
if (stat(xlogpath, &stat_buf) == 0)
|
|
{
|
|
if (expectedSize > 0 && stat_buf.st_size != expectedSize)
|
|
pg_fatal("unexpected file size for \"%s\": %lld instead of %lld",
|
|
xlogfname, (long long int) stat_buf.st_size,
|
|
(long long int) expectedSize);
|
|
else
|
|
{
|
|
int xlogfd = open(xlogpath, O_RDONLY | PG_BINARY, 0);
|
|
|
|
if (xlogfd < 0)
|
|
pg_fatal("could not open file \"%s\" restored from archive: %m",
|
|
xlogpath);
|
|
else
|
|
return xlogfd;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (errno != ENOENT)
|
|
pg_fatal("could not stat file \"%s\": %m",
|
|
xlogpath);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the failure was due to a signal, then it would be misleading to
|
|
* return with a failure at restoring the file. So just bail out and
|
|
* exit. Hard shell errors such as "command not found" are treated as
|
|
* fatal too.
|
|
*/
|
|
if (wait_result_is_any_signal(rc, true))
|
|
pg_fatal("restore_command failed: %s",
|
|
wait_result_to_str(rc));
|
|
|
|
/*
|
|
* The file is not available, so just let the caller decide what to do
|
|
* next.
|
|
*/
|
|
pg_log_error("could not restore file \"%s\" from archive",
|
|
xlogfname);
|
|
return -1;
|
|
}
|