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backup.c
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/*-------------------------------------------------------------------------
*
* backup.c: backup DB cluster, archived WAL, serverlog.
*
* Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "pg_rman.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <dirent.h>
#include <time.h>
#include <math.h>
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "pgut/pgut-port.h"
#define TIMEOUT_ARCHIVE 10 /* wait 10 sec until WAL archive complete */
static bool in_backup = false; /* TODO: more robust logic */
static parray *cleanup_list; /* list of command to execute at error processing for snapshot */
/*
* data_checksum_enabled as read from the control file of the database
* cluster. Exposed for use in data.c.
*/
bool data_checksum_enabled = false;
static void init_data_checksum_enabled(void);
/*
* Backup routines
*/
static void backup_cleanup(bool fatal, void *userdata);
static void delete_old_files(const char *root, parray *files, int keep_files,
int keep_days, bool is_arclog);
static void backup_files(const char *from_root, const char *to_root,
parray *files, parray *prev_files, const XLogRecPtr *lsn, bool compress, const char *prefix);
static parray *do_backup_database(parray *backup_list, pgBackupOption bkupopt);
static parray *do_backup_arclog(parray *backup_list);
static parray *do_backup_srvlog(parray *backup_list);
static void confirm_block_size(const char *name, int blcksz);
static void pg_start_backup(const char *label, bool smooth, pgBackup *backup);
static parray *pg_stop_backup(pgBackup *backup);
static void pg_switch_wal(pgBackup *backup);
static void get_lsn(PGresult *res, TimeLineID *timeline, XLogRecPtr *lsn);
static void get_xid(PGresult *res, uint32 *xid);
static bool execute_restartpoint(pgBackupOption bkupopt, pgBackup *backup);
static void delete_arclog_link(void);
static void delete_online_wal_backup(void);
static bool dirExists(const char *path);
static void execute_freeze(void);
static void execute_unfreeze(void);
static void execute_split(parray *tblspc_list);
static void execute_resync(void);
static void execute_mount(parray *tblspcmp_list);
static void execute_umount(void);
static void execute_script(const char *mode, bool is_cleanup, parray *output);
static void snapshot_cleanup(bool fatal, void *userdata);
static void add_files(parray *files, const char *root, bool add_root, bool is_pgdata);
static int strCompare(const void *str1, const void *str2);
static void create_file_list(parray *files, const char *root, const char *prefix, bool is_append);
static void check_server_version(void);
static int wal_segment_size = 0;
/*
* Take a backup of database.
*/
static parray *
do_backup_database(parray *backup_list, pgBackupOption bkupopt)
{
int i;
parray *files; /* backup file list from non-snapshot */
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char label[1024];
XLogRecPtr *lsn = NULL;
char prev_file_txt[MAXPGPATH]; /* path of the previous backup list file */
/* repack the options */
bool smooth_checkpoint = bkupopt.smooth_checkpoint;
check_server_version();
init_data_checksum_enabled();
if (!HAVE_DATABASE(¤t))
{
/* check if arclog backup. if arclog backup and no suitable full backup, */
if (HAVE_ARCLOG(¤t))
{
pgBackup *prev_backup;
/* find last completed database backup */
prev_backup = catalog_get_last_full_backup(backup_list);
if (prev_backup == NULL)
{
if (current.full_backup_on_error)
{
ereport(NOTICE,
(errmsg("turn to take a full backup"),
errdetail("There is no validated full backup with current timeline.")));
current.backup_mode = BACKUP_MODE_FULL;
}
else
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("cannot take an incremental backup"),
errdetail("There is no validated full backup with current timeline."),
errhint("Please take a full backup and validate it before doing an archive backup. "
"Or use with --full-backup-on-error command line option.")));
}
else
return NULL;
}
}
elog(INFO, _("copying database files"));
/* initialize size summary */
current.total_data_bytes = 0;
current.read_data_bytes = 0;
/* notify start of backup to PostgreSQL server */
time2iso(label, lengthof(label), current.start_time);
strncat(label, " with pg_rman", lengthof(label));
pg_start_backup(label, smooth_checkpoint, ¤t);
/* Execute restartpoint on standby once replay reaches the backup LSN */
if (current.is_from_standby && !execute_restartpoint(bkupopt, ¤t))
{
/*
* Disconnecting automatically aborts a non-exclusive backup, so no
* need to call pg_stop_backup() do it for us.
*/
disconnect();
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not execute restartpoint")));
}
/*
* Generate mkdirs.sh required to recreate the directory structure of
* PGDATA when restoring. Omits $PGDATA from being listed in the
* commands. Note that the resulting mkdirs.sh file is part of the
* backup.
*/
files = parray_new();
dir_list_file(files, pgdata, NULL, false, false);
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), MKDIRS_SH_FILE);
fp = fopen(path, "wt");
if (fp == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open make directory script \"%s\": %s",
path, strerror(errno))));
dir_print_mkdirs_sh(fp, files, pgdata);
fclose(fp);
if (chmod(path, DIR_PERMISSION) == -1)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not change mode of \"%s\": %s", path,
strerror(errno))));
}
/* Free no longer needed memory. */
parray_walk(files, pgFileFree);
parray_free(files);
files = NULL;
/*
* To take incremental backup, the file list of the latest validated
* full database backup is needed.
*/
if (current.backup_mode < BACKUP_MODE_FULL)
{
pgBackup *prev_backup;
uint32 xlogid, xrecoff;
/* find last completed database backup */
prev_backup = catalog_get_last_full_backup(backup_list);
if (prev_backup == NULL || prev_backup->tli != current.tli)
{
if (current.full_backup_on_error)
{
ereport(NOTICE,
(errmsg("turn to take a full backup"),
errdetail("There is no validated full backup with current timeline.")));
current.backup_mode = BACKUP_MODE_FULL;
}
else
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("cannot take an incremental backup"),
errdetail("There is no validated full backup with current timeline."),
errhint("Please take a full backup and validate it before doing an incremental backup. "
"Or use with --full-backup-on-error command line option.")));
}
else
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
DATABASE_FILE_LIST);
prev_files = dir_read_file_list(pgdata, prev_file_txt);
/*
* Do backup only pages having larger LSN than previous backup.
*/
lsn = &prev_backup->start_lsn;
xlogid = (uint32) (*lsn >> 32);
xrecoff = (uint32) *lsn;
elog(DEBUG, _("backup only the page updated after LSN(%X/%08X)"),
xlogid, xrecoff);
}
}
/* initialize backup list from non-snapshot */
files = parray_new();
/*
* Check the existence of the snapshot-script and perform backup using the
* snapshot_script if one is provided.
*/
join_path_components(path, backup_path, SNAPSHOT_SCRIPT_FILE);
if (!fileExists(path))
{
/* Nope. Perform a simple backup by copying files. */
parray *stop_backup_files;
/*
* List files contained in PGDATA, omitting all sub-directories beside
* base, global and pg_tblspc. Omits $PGDATA from the paths.
*/
add_files(files, pgdata, false, true);
if (current.backup_mode == BACKUP_MODE_FULL)
elog(DEBUG, "taking full backup of database files");
else if (current.backup_mode == BACKUP_MODE_INCREMENTAL)
elog(DEBUG, "taking incremental backup of database files");
/* Construct the directory for this backup within BACKUP_PATH. */
pgBackupGetPath(¤t, path, lengthof(path), DATABASE_DIR);
/* Save the files listed above. */
backup_files(pgdata, path, files, prev_files, lsn, current.compress_data, NULL);
/*
* Notify end of backup and save the backup_label and tablespace_map
* files.
*/
stop_backup_files = pg_stop_backup(¤t);
/* stop_backup_files must be listed in file_database.txt. */
files = parray_concat(stop_backup_files, files);
/*
* Construct file_database.txt listing all files we just saved under
* DATABASE_DIR.
*/
create_file_list(files, pgdata, NULL, false);
}
else
{
/* Use snapshot_script. */
parray *tblspc_list; /* list of name of TABLESPACE backup from snapshot */
parray *tblspcmp_list; /* list of mounted directory of TABLESPACE in snapshot volume */
PGresult *tblspc_res; /* contain spcname and oid in TABLESPACE */
parray *stop_backup_files; /* list of files that pg_stop_backup() wrote */
/* if backup is from standby, snapshot backup is unsupported */
if (current.is_from_standby)
{
/*
* Disconnecting automatically aborts a non-exclusive backup, so no
* need to call pg_stop_backup() do it for us.
*/
disconnect();
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("cannot take a backup"),
errdetail("Taking backup from standby server with snapshot-script is not supported")));
}
tblspc_list = parray_new();
tblspcmp_list = parray_new();
cleanup_list = parray_new();
/*
* append 'pg_tblspc' to list of directory excluded from copy.
* because DB cluster and TABLESPACE are copied separately.
*/
for (i = 0; pgdata_exclude[i]; i++); /* find first empty slot */
pgdata_exclude[i] = PG_TBLSPC_DIR;
/* set the error processing for the snapshot */
pgut_atexit_push(snapshot_cleanup, cleanup_list);
/* create snapshot volume */
if (!check)
{
/* freeze I/O of the file-system */
execute_freeze();
/* create the snapshot, and obtain the name of TABLESPACE backup from snapshot */
execute_split(tblspc_list);
/* unfreeze I/O of the file-system */
execute_unfreeze();
}
/*
* when DB cluster is not contained in the backup from the snapshot,
* DB cluster is added to the backup file list from non-snapshot.
*/
parray_qsort(tblspc_list, strCompare);
if (parray_bsearch(tblspc_list, "PG-DATA", strCompare) == NULL)
add_files(files, pgdata, false, true);
else
/* remove the detected tablespace("PG-DATA") from tblspc_list */
parray_rm(tblspc_list, "PG-DATA", strCompare);
/*
* select the TABLESPACE backup from non-snapshot,
* and append TABLESPACE to the list backup from non-snapshot.
* TABLESPACE name and oid is obtained by inquiring of the database.
*/
Assert(connection != NULL);
tblspc_res = execute("SELECT spcname, oid FROM pg_tablespace WHERE "
"spcname NOT IN ('pg_default', 'pg_global') ORDER BY spcname ASC", 0, NULL);
for (i = 0; i < PQntuples(tblspc_res); i++)
{
char *name = PQgetvalue(tblspc_res, i, 0);
char *oid = PQgetvalue(tblspc_res, i, 1);
/* when not found, append it to the backup list from non-snapshot */
if (parray_bsearch(tblspc_list, name, strCompare) == NULL)
{
char dir[MAXPGPATH];
join_path_components(dir, pgdata, PG_TBLSPC_DIR);
join_path_components(dir, dir, oid);
add_files(files, dir, true, false);
}
else
/* remove the detected tablespace from tblspc_list */
parray_rm(tblspc_list, name, strCompare);
}
/*
* tblspc_list is not empty,
* so snapshot-script output the tablespace name that not exist.
*/
if (parray_num(tblspc_list) > 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("snapshot-script output the name of tablespace that not exist")));
/* clear array */
parray_walk(tblspc_list, free);
parray_free(tblspc_list);
/* backup files from non-snapshot */
pgBackupGetPath(¤t, path, lengthof(path), DATABASE_DIR);
backup_files(pgdata, path, files, prev_files, lsn, current.compress_data, NULL);
/*
* Notify end of backup and write backup_label and tablespace_map
* files to backup destination directory.
*/
stop_backup_files = pg_stop_backup(¤t);
files = parray_concat(stop_backup_files, files);
/* create file list of non-snapshot objects */
create_file_list(files, pgdata, NULL, false);
/* mount snapshot volume to file-system, and obtain that mounted directory */
if (!check)
execute_mount(tblspcmp_list);
/* backup files from snapshot volume */
for (i = 0; i < parray_num(tblspcmp_list); i++)
{
char *spcname;
char *mp = NULL;
char *item = (char *) parray_get(tblspcmp_list, i);
parray *snapshot_files = parray_new();
/*
* obtain the TABLESPACE name and the directory where it is stored.
* Note: strtok() replace the delimiter to '\0'. but no problem because
* it doesn't use former value
*/
if ((spcname = strtok(item, "=")) == NULL || (mp = strtok(NULL, "\0")) == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("snapshot-script output illegal format: %s", item)));
if (verbose)
{
printf(_("========================================\n"));
printf(_("backup files from snapshot: \"%s\"\n"), spcname);
}
/* tablespace storage directory not exist */
if (!dirExists(mp))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("tablespace storage directory doesn't exist: %s", mp)));
/*
* create the previous backup file list to take incremental backup
* from the snapshot volume.
*/
if (prev_files != NULL)
prev_files = dir_read_file_list(mp, prev_file_txt);
/* when DB cluster is backup from snapshot, it backup from the snapshot */
if (strcmp(spcname, "PG-DATA") == 0)
{
/* append DB cluster to backup file list */
add_files(snapshot_files, mp, false, true);
/* backup files of DB cluster from snapshot volume */
backup_files(mp, path, snapshot_files, prev_files, lsn, current.compress_data, NULL);
/* create file list of snapshot objects (DB cluster) */
create_file_list(snapshot_files, mp, NULL, true);
/* remove the detected tablespace("PG-DATA") from tblspcmp_list */
parray_rm(tblspcmp_list, "PG-DATA", strCompare);
i--;
}
/* backup TABLESPACE from snapshot volume */
else
{
int j;
/*
* obtain the oid from TABLESPACE information acquired by inquiring of database.
* and do backup files of TABLESPACE from snapshot volume.
*/
for (j = 0; j < PQntuples(tblspc_res); j++)
{
char dest[MAXPGPATH];
char prefix[MAXPGPATH];
char *name = PQgetvalue(tblspc_res, j, 0);
char *oid = PQgetvalue(tblspc_res, j, 1);
if (strcmp(spcname, name) == 0)
{
/* append TABLESPACE to backup file list */
add_files(snapshot_files, mp, true, false);
/* backup files of TABLESPACE from snapshot volume */
join_path_components(prefix, PG_TBLSPC_DIR, oid);
join_path_components(dest, path, prefix);
backup_files(mp, dest, snapshot_files, prev_files, lsn, current.compress_data, prefix);
/* create file list of snapshot objects (TABLESPACE) */
create_file_list(snapshot_files, mp, prefix, true);
/* remove the detected tablespace("PG-DATA") from tblspcmp_list */
parray_rm(tblspcmp_list, spcname, strCompare);
i--;
break;
}
}
}
parray_concat(files, snapshot_files);
}
/*
* tblspcmp_list is not empty,
* so snapshot-script output the tablespace name that not exist.
*/
if (parray_num(tblspcmp_list) > 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("snapshot-script output the name of tablespace that not exist")));
/* clear array */
parray_walk(tblspcmp_list, free);
parray_free(tblspcmp_list);
/* snapshot became unnecessary, annul the snapshot */
if (!check)
{
/* unmount directory of mounted snapshot volume */
execute_umount();
/* annul the snapshot */
execute_resync();
}
/* unset the error processing for the snapshot */
pgut_atexit_pop(snapshot_cleanup, cleanup_list);
/* don't use 'parray_walk'. element of parray not allocate memory by malloc */
parray_free(cleanup_list);
PQclear(tblspc_res);
}
/* Update various size fields in current. */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.total_data_bytes += file->size;
current.read_data_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
current.write_bytes += file->write_size;
}
if (verbose)
{
printf(_("database backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_data_bytes, current.write_bytes);
printf(_("========================================\n"));
}
return files;
}
/*
* Connects to the standby server described by command line options,
* waits for the minimum WAL location required by this backup to be replayed,
* and finally performs a restartpoint.
*
* Returns false if could not connect to the statndby server, although that
* currently never happens, because pgut_connect() errors out anyway.
*/
static bool
execute_restartpoint(pgBackupOption bkupopt, pgBackup *backup)
{
PGconn *sby_conn = NULL;
PGresult *res;
XLogRecPtr replayed_lsn;
int sleep_time = 1;
/*
* Change connection to standby server, so that any commands executed from
* this point on are sent to the standby server.
*/
pgut_set_host(bkupopt.standby_host);
pgut_set_port(bkupopt.standby_port);
sby_conn = save_connection();
if (!sby_conn)
{
restore_saved_connection();
return false;
}
while (1)
{
uint32 xlogid, xrecoff;
/*
* Wait for standby server to replay WAL up to the LSN returned by
* pg_start_backup()
*/
res = execute("SELECT * FROM pg_last_wal_replay_lsn()", 0, NULL);
sscanf(PQgetvalue(res, 0, 0), "%X/%X", &xlogid, &xrecoff);
PQclear(res);
replayed_lsn = (XLogRecPtr) ((uint64) xlogid << 32) | xrecoff;
if (replayed_lsn >= backup->start_lsn)
break;
sleep(sleep_time);
/* next sleep_time is increasing by 2 times. */
/* ex: 1, 2, 4, 8, 16, 32, 60, 60, 60... */
sleep_time = (sleep_time < 32) ? sleep_time * 2 : 60;
}
/* Perform the restartpoint */
command("CHECKPOINT", 0, NULL);
/*
* Done sending commands to standby, restore our connection to primary.
*/
restore_saved_connection();
return true;
}
/*
* backup archived WAL incrementally.
*/
static parray *
do_backup_arclog(parray *backup_list)
{
int i;
parray *files;
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char timeline_dir[MAXPGPATH];
char prev_file_txt[MAXPGPATH];
pgBackup *prev_backup;
int64 arclog_write_bytes = 0;
char last_wal[MAXPGPATH];
if (!HAVE_ARCLOG(¤t) || check)
return NULL;
if (verbose)
{
printf(_("========================================\n"));
}
elog(INFO, _("copying archived WAL files"));
/* initialize size summary */
current.read_arclog_bytes = 0;
/* switch xlog if database is not backed up */
if (((uint32) current.stop_lsn) == 0)
pg_switch_wal(¤t);
/*
* To take incremental backup, the file list of the last completed database
* backup is needed.
*/
prev_backup = catalog_get_last_arclog_backup(backup_list);
if (prev_backup == NULL)
elog(DEBUG, "turn to take a full backup of archived WAL files");
if (prev_backup)
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
ARCLOG_FILE_LIST);
prev_files = dir_read_file_list(arclog_path, prev_file_txt);
}
/* list files with the logical path. omit ARCLOG_PATH */
files = parray_new();
dir_list_file(files, arclog_path, NULL, true, false);
/* remove WALs archived after pg_stop_backup()/pg_switch_wal() */
xlog_fname(last_wal, lengthof(last_wal), current.tli, ¤t.stop_lsn,
wal_segment_size);
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
char *fname;
if ((fname = last_dir_separator(file->path)))
fname++;
else
fname = file->path;
/* to backup backup history files, compare tli/lsn portion only */
if (strncmp(fname, last_wal, 24) > 0)
{
parray_remove(files, i);
i--;
}
}
elog(DEBUG, "taking backup of archived WAL files");
pgBackupGetPath(¤t, path, lengthof(path), ARCLOG_DIR);
backup_files(arclog_path, path, files, prev_files, NULL,
current.compress_data, NULL);
/* create file list */
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), ARCLOG_FILE_LIST);
fp = fopen(path, "wt");
if (fp == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open file list \"%s\": %s", path,
strerror(errno))));
dir_print_file_list(fp, files, arclog_path, NULL);
fclose(fp);
}
/* print summary of size of backup files */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.read_arclog_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
{
current.write_bytes += file->write_size;
arclog_write_bytes += file->write_size;
}
}
/*
* Backup timeline history files to special directory.
* We do this after create file list, because copy_file() update
* pgFile->write_size to actual size.
*/
join_path_components(timeline_dir, backup_path, TIMELINE_HISTORY_DIR);
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
if (strstr(file->path, ".history") ==
file->path + strlen(file->path) - strlen(".history"))
{
elog(DEBUG, _("(timeline history) %s"), file->path);
copy_file(arclog_path, timeline_dir, file, NO_COMPRESSION);
}
}
if (verbose)
{
printf(_("archived WAL backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_arclog_bytes, arclog_write_bytes);
printf(_("========================================\n"));
}
return files;
}
/*
* Take a backup of serverlog.
*/
static parray *
do_backup_srvlog(parray *backup_list)
{
int i;
parray *files;
parray *prev_files = NULL; /* file list of previous database backup */
FILE *fp;
char path[MAXPGPATH];
char prev_file_txt[MAXPGPATH];
pgBackup *prev_backup;
int64 srvlog_write_bytes = 0;
if (!current.with_serverlog)
return NULL;
if (verbose)
{
printf(_("========================================\n"));
}
elog(INFO, _("copying server log files"));
/* initialize size summary */
current.read_srvlog_bytes = 0;
/*
* To take incremental backup, the file list of the last completed database
* backup is needed.
*/
prev_backup = catalog_get_last_srvlog_backup(backup_list);
if (prev_backup == NULL)
elog(DEBUG, "turn to take a full backup of server log files");
if (prev_backup)
{
pgBackupGetPath(prev_backup, prev_file_txt, lengthof(prev_file_txt),
SRVLOG_FILE_LIST);
prev_files = dir_read_file_list(srvlog_path, prev_file_txt);
}
/* list files with the logical path. omit SRVLOG_PATH */
files = parray_new();
dir_list_file(files, srvlog_path, NULL, true, false);
pgBackupGetPath(¤t, path, lengthof(path), SRVLOG_DIR);
backup_files(srvlog_path, path, files, prev_files, NULL, false, NULL);
/* create file list */
if (!check)
{
pgBackupGetPath(¤t, path, lengthof(path), SRVLOG_FILE_LIST);
fp = fopen(path, "wt");
if (fp == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open file list \"%s\": %s", path,
strerror(errno))));
dir_print_file_list(fp, files, srvlog_path, NULL);
fclose(fp);
}
/* print summary of size of backup mode files */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
if (!S_ISREG(file->mode))
continue;
current.read_srvlog_bytes += file->read_size;
if (file->write_size != BYTES_INVALID)
{
current.write_bytes += file->write_size;
srvlog_write_bytes += file->write_size;
}
}
if (verbose)
{
printf(_("serverlog backup completed(read: " INT64_FORMAT " write: " INT64_FORMAT ")\n"),
current.read_srvlog_bytes, srvlog_write_bytes);
printf(_("========================================\n"));
}
return files;
}
int
do_backup(pgBackupOption bkupopt)
{
parray *backup_list;
parray *files_database;
parray *files_arclog;
parray *files_srvlog;
int ret;
char path[MAXPGPATH];
/* repack the necesary options */
int keep_arclog_files = bkupopt.keep_arclog_files;
int keep_arclog_days = bkupopt.keep_arclog_days;
int keep_srvlog_files = bkupopt.keep_srvlog_files;
int keep_srvlog_days = bkupopt.keep_srvlog_days;
int keep_data_generations = bkupopt.keep_data_generations;
int keep_data_days = bkupopt.keep_data_days;
ControlFileData *controlFile;
bool crc_ok;
/* PGDATA and BACKUP_MODE are always required */
if (pgdata == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: PGDATA (-D, --pgdata)")));
if (current.backup_mode == BACKUP_MODE_INVALID)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: BACKUP_MODE (-b, --backup-mode)")));
/* ARCLOG_PATH is required only when backup archive WAL */
if (HAVE_ARCLOG(¤t) && arclog_path == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: ARCLOG_PATH (-A, --arclog-path)")));
/* SRVLOG_PATH is required only when backup serverlog */
if (current.with_serverlog && srvlog_path == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: SRVLOG_PATH (-S, --srvlog-path)")));
/*
* If we are taking backup from standby
* (ie, $PGDATA has recovery.conf or standby.signal),
* check required parameters (ie, standby connection info).
*/
snprintf(path, lengthof(path), "%s/standby.signal", pgdata);
make_native_path(path);
if (fileExists(path))
{
if (!bkupopt.standby_host || !bkupopt.standby_port)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("please specify both standby host and port")));
current.is_from_standby = true;
}
else
current.is_from_standby = false;
#ifndef HAVE_LIBZ
if (current.compress_data)
{
ereport(WARNING,
(errmsg("this pg_rman build does not support compression"),
errhint("Please build PostgreSQL with zlib to use compression.")));
current.compress_data = false;
}
#endif
controlFile = get_controlfile(pgdata, &crc_ok);
if (!crc_ok)
ereport(WARNING,
(errmsg("control file appears to be corrupt"),
errdetail("Calculated CRC checksum does not match value stored in file.")));
wal_segment_size = controlFile->xlog_seg_size;
pg_free(controlFile);
/* Check that we're working with the correct database cluster */
check_system_identifier();
/* show configuration actually used */
if (verbose)
{
printf(_("========================================\n"));
printf(_("backup start\n"));
printf(_("----------------------------------------\n"));
pgBackupWriteConfigSection(stderr, ¤t);
printf(_("----------------------------------------\n"));
}
/* get exclusive lock of backup catalog */
ret = catalog_lock();
if (ret == -1)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not lock backup catalog")));
else if (ret == 1)
ereport(ERROR,
(errcode(ERROR_ALREADY_RUNNING),
errmsg("could not lock backup catalog"),
errdetail("Another pg_rman is just running. Skip this backup.")));
/* initialize backup result */
current.status = BACKUP_STATUS_RUNNING;
current.tli = 0; /* get from result of pg_start_backup() */
current.start_lsn = current.stop_lsn = (XLogRecPtr) 0;
current.start_time = time(NULL);
current.end_time = (time_t) 0;
current.total_data_bytes = BYTES_INVALID;
current.read_data_bytes = BYTES_INVALID;
current.read_arclog_bytes = BYTES_INVALID;
current.read_srvlog_bytes = BYTES_INVALID;
current.write_bytes = 0; /* write_bytes is valid always */
current.block_size = BLCKSZ;
current.wal_block_size = XLOG_BLCKSZ;
current.recovery_xid = 0;
current.recovery_time = (time_t) 0;
/* create backup directory and backup.ini */
if (!check)
{
if (pgBackupCreateDir(¤t))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not create backup directory")));
pgBackupWriteIni(¤t);
}
elog(DEBUG, "destination directories of backup are initialized");
/* get list of backups already taken */
backup_list = catalog_get_backup_list(NULL);
if(!backup_list)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not get list of backup already taken")));
/* set the error processing function for the backup process */
pgut_atexit_push(backup_cleanup, NULL);
/*
* Signal for backup_cleanup() that there may actually be some cleanup
* for it to do from this point on.
*/
in_backup = true;
/* backup data */
files_database = do_backup_database(backup_list, bkupopt);
/* backup archived WAL */
files_arclog = do_backup_arclog(backup_list);
/* backup serverlog */
files_srvlog = do_backup_srvlog(backup_list);
pgut_atexit_pop(backup_cleanup, NULL);
/* update backup status to DONE */
current.end_time = time(NULL);
current.status = BACKUP_STATUS_DONE;
if (!check)
pgBackupWriteIni(¤t);
if (verbose)
{
if (TOTAL_READ_SIZE(¤t) == 0)
printf(_("nothing to backup\n"));
else
printf(_("all backup completed(read: " INT64_FORMAT " write: "
INT64_FORMAT ")\n"),
TOTAL_READ_SIZE(¤t), current.write_bytes);
printf(_("========================================\n"));
}
ereport(INFO,
(errmsg("backup complete")));
ereport(INFO,
(errmsg("Please execute 'pg_rman validate' to verify the files are correctly copied.")));
/*
* Delete old files (archived WAL and serverlog) after update of status.
*/