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restore.c
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restore.c
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/*-------------------------------------------------------------------------
*
* restore.c: restore DB cluster and archived WAL.
*
* Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
*-------------------------------------------------------------------------
*/
#include "pg_rman.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "catalog/pg_control.h"
#include "common/controldata_utils.h"
#include "common/fe_memutils.h"
static void backup_online_files(bool re_recovery);
static void restore_online_files(void);
static void restore_database(pgBackup *backup);
static void restore_archive_logs(pgBackup *backup, bool is_hard_copy);
static void add_recovery_related_options(const char *target_time,
const char *target_xid,
const char *target_inclusive,
TimeLineID target_tli,
bool target_tli_latest);
static void create_recovery_signal(void);
static pgRecoveryTarget *checkIfCreateRecoveryConf(const char *target_time,
const char *target_xid,
const char *target_inclusive);
static parray * readTimeLineHistory(TimeLineID targetTLI);
static bool satisfy_timeline(const parray *timelines, const pgBackup *backup);
static bool satisfy_recovery_target(const pgBackup *backup, const pgRecoveryTarget *rt);
static TimeLineID get_fullbackup_timeline(parray *backups, const pgRecoveryTarget *rt);
static TimeLineID parse_target_timeline(const char *target_tli_string, TimeLineID cur_tli,
bool *target_tli_latest);
static TimeLineID findNewestTimeLine(TimeLineID startTLI);
static bool existsTimeLineHistory(TimeLineID probeTLI);
static void print_backup_id(const pgBackup *backup);
static void search_next_wal(const char *path, uint32 *needId, uint32 *needSeg, parray *timelines);
static int wal_segment_size = 0;
int
do_restore(const char *target_time,
const char *target_xid,
const char *target_inclusive,
const char *target_tli_string,
bool is_hard_copy)
{
int i;
int base_index; /* index of base (full) backup */
int last_restored_index; /* index of last restored database backup */
int ret;
TimeLineID target_tli;
bool target_tli_latest = false;
TimeLineID cur_tli;
TimeLineID backup_tli;
parray *backups;
pgBackup *base_backup = NULL;
parray *files;
parray *timelines;
char timeline_dir[MAXPGPATH];
char timestamp[20];
uint32 needId = 0;
uint32 needSeg = 0;
pgRecoveryTarget *rt = NULL;
ControlFileData *controlFile;
bool crc_ok;
char ControlFilePath[MAXPGPATH];
/* PGDATA and ARCLOG_PATH are always required */
if (pgdata == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: PGDATA (-D, --pgdata)")));
if (arclog_path == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: ARCLOG_PATH (-A, --arclog-path)")));
if (srvlog_path == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("required parameter not specified: SRVLOG_PATH (-S, --srvlog-path)")));
if (verbose)
{
printf(_("========================================\n"));
printf(_("restore start\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.")));
/* confirm the PostgreSQL server is not running */
if (is_pg_running())
ereport(ERROR,
(errcode(ERROR_PG_RUNNING),
errmsg("PostgreSQL server is running"),
errhint("Please stop PostgreSQL server before executing restore.")));
rt = checkIfCreateRecoveryConf(target_time, target_xid, target_inclusive);
if(rt == NULL)
ereport(ERROR,
(errcode(ERROR_ARGS),
errmsg("could not create recovery.conf or"
"add recovery related options to postgresql.conf(after PG12)"),
errdetail("The specified options are invalid.")));
/* get list of backups. (index == 0) is the last backup */
backups = catalog_get_backup_list(NULL);
if(!backups)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not get list of backup already taken")));
/* get wal_segment_size from pg_control file, it is needed for check option. */
if (check)
{
snprintf(ControlFilePath, MAXPGPATH, "%s/global/pg_control", pgdata);
if (fileExists(ControlFilePath))
{
controlFile = get_controlfile(pgdata, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(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);
}
else
{
elog(ERROR, _("pg_controldata file \"%s\" does not exist"),
ControlFilePath);
}
}
cur_tli = get_current_timeline();
elog(DEBUG, "the current timeline ID of database cluster is %d", cur_tli);
backup_tli = get_fullbackup_timeline(backups, rt);
elog(DEBUG, "the timeline ID of latest full backup is %d", backup_tli);
/*
* determine target timeline;
* first parse the user specified string value for the target timeline
* passed in via --recovery-target-timeline option. Need this because
* the value 'latest' is also supported.
*/
if(target_tli_string)
{
target_tli = parse_target_timeline(target_tli_string, cur_tli, &target_tli_latest);
elog(INFO, "the specified target timeline ID is %d", target_tli);
}
else
{
elog(INFO, "the recovery target timeline ID is not given");
if (cur_tli != 0)
{
target_tli = cur_tli;
elog(INFO, "use timeline ID of current database cluster as recovery target: %d",
cur_tli);
}
else
{
backup_tli = get_fullbackup_timeline(backups, rt);
target_tli = backup_tli;
elog(INFO, "use timeline ID of latest full backup as recovery target: %d",
backup_tli);
}
}
/*
* restore timeline history files and get timeline branches can reach
* recovery target point.
*/
elog(INFO, "calculating timeline branches to be used to recovery target point");
join_path_components(timeline_dir, backup_path, TIMELINE_HISTORY_DIR);
dir_copy_files(timeline_dir, arclog_path);
timelines = readTimeLineHistory(target_tli);
/* find last full backup which can be used as base backup. */
elog(INFO, "searching latest full backup which can be used as restore start point");
for (i = 0; i < parray_num(backups); i++)
{
base_backup = (pgBackup *) parray_get(backups, i);
if (base_backup->backup_mode < BACKUP_MODE_FULL ||
base_backup->status != BACKUP_STATUS_OK)
continue;
#ifndef HAVE_LIBZ
/* Make sure we won't need decompression we haven't got */
if (base_backup->compress_data &&
(HAVE_DATABASE(base_backup) || HAVE_ARCLOG(base_backup)))
{
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not restore from compressed backup"),
errdetail("Compression is not supported in this installation.")));
}
#endif
if (satisfy_timeline(timelines, base_backup) && satisfy_recovery_target(base_backup, rt))
{
time2iso(timestamp, lengthof(timestamp), base_backup->start_time);
elog(INFO, "found the full backup can be used as base in recovery: \"%s\"",
timestamp);
goto base_backup_found;
}
}
/* no full backup found, can't restore */
ereport(ERROR,
(errcode(ERROR_NO_BACKUP),
errmsg("cannot do restore"),
errdetail("There is no valid full backup which can be used for given recovery condition.")));
base_backup_found:
/* first off, backup online WAL and serverlog */
backup_online_files(cur_tli != 0 && cur_tli != backup_tli);
/*
* Clear restore destination, but don't remove $PGDATA.
* To remove symbolic link, get file list with "omit_symlink = false".
*
* Doing it *after* a good base backup is found so that we don't end up
* in a situation where the target data directory is already deleted
* but we could not find a valid base backup based on user specified
* restore options (perhaps a mistake on user's part but we should be
* cautious.)
*/
if (!check)
{
int i;
if (verbose)
printf(_("----------------------------------------\n"));
elog(INFO, "clearing restore destination");
files = parray_new();
dir_list_file(files, pgdata, NULL, false, false);
parray_qsort(files, pgFileComparePathDesc); /* delete from leaf */
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
pgFileDelete(file);
}
parray_walk(files, pgFileFree);
parray_free(files);
}
/* OK, now proceed to restoring the backup */
base_index = i;
if (verbose)
print_backup_id(base_backup);
/* restore base backup */
restore_database(base_backup);
last_restored_index = base_index;
/* restore following incremental backup */
if (verbose)
printf(_("----------------------------------------\n"));
elog(INFO, "searching incremental backup to be restored");
for (i = base_index - 1; i >= 0; i--)
{
pgBackup *backup = (pgBackup *) parray_get(backups, i);
/* don't use incomplete nor different timeline backup */
if (backup->status != BACKUP_STATUS_OK ||
backup->tli != base_backup->tli)
continue;
/* use database backup only */
if (backup->backup_mode != BACKUP_MODE_INCREMENTAL)
continue;
/* is the backup is necessary for restore to target timeline ? */
if (!satisfy_timeline(timelines, backup) || !satisfy_recovery_target(backup, rt))
continue;
if (verbose)
print_backup_id(backup);
time2iso(timestamp, lengthof(timestamp), backup->start_time);
elog(DEBUG, "found the incremental backup can be used in recovery: \"%s\"",
timestamp);
restore_database(backup);
last_restored_index = i;
}
/*
* Restore archived WAL which backed up with or after last restored backup.
* We don't check the backup->tli because a backup of archived WAL
* can contain WALs which were archived in multiple timeline.
*/
if (check)
{
pgBackup *backup = (pgBackup *) parray_get(backups, last_restored_index);
needId = (uint32) (backup->start_lsn >> 32);
needSeg = (uint32) backup->start_lsn / wal_segment_size;
}
if (verbose)
printf(_("----------------------------------------\n"));
elog(INFO, "searching backup which contained archived WAL files to be restored");
for (i = last_restored_index; i >= 0; i--)
{
pgBackup *backup = (pgBackup *) parray_get(backups, i);
/* don't use incomplete backup */
if (backup->status != BACKUP_STATUS_OK)
continue;
if (!HAVE_ARCLOG(backup))
continue;
/* care timeline junction */
if (!satisfy_timeline(timelines, backup))
continue;
restore_archive_logs(backup, is_hard_copy);
if (check)
{
char xlogpath[MAXPGPATH];
pgBackupGetPath(backup, xlogpath, lengthof(xlogpath), ARCLOG_DIR);
search_next_wal(xlogpath, &needId, &needSeg, timelines);
}
}
/* copy online WAL backup to $PGDATA/pg_wal */
restore_online_files();
if (check)
{
char xlogpath[MAXPGPATH];
if (verbose)
printf(_("searching archived WAL\n"));
search_next_wal(arclog_path, &needId, &needSeg, timelines);
if (verbose)
printf(_("searching online WAL\n"));
join_path_components(xlogpath, pgdata, PG_XLOG_DIR);
search_next_wal(xlogpath, &needId, &needSeg, timelines);
if (verbose)
printf(_("all necessary files are found.\n"));
}
/* Add recovery related options to postgresql.conf file */
add_recovery_related_options(target_time, target_xid, target_inclusive,
target_tli, target_tli_latest);
/* Create recovery.signal file */
create_recovery_signal();
/* release catalog lock */
catalog_unlock();
/* cleanup */
parray_walk(backups, pgBackupFree);
parray_free(backups);
/* print restore complete message */
if (verbose && !check)
{
printf(_("all restore completed\n"));
printf(_("========================================\n"));
}
if (!check)
ereport(INFO,
(errmsg("restore complete"),
errhint("Recovery will start automatically when the PostgreSQL server is started.")));
return 0;
}
/*
* Validate and restore backup.
*/
void
restore_database(pgBackup *backup)
{
char timestamp[100];
char path[MAXPGPATH];
char list_path[MAXPGPATH];
int ret;
parray *files;
int i;
int num_skipped = 0;
/* confirm block size compatibility */
if (backup->block_size != BLCKSZ)
ereport(ERROR,
(errcode(ERROR_PG_INCOMPATIBLE),
errmsg("BLCKSZ(%d) is not compatible (%d expected)",
backup->block_size, BLCKSZ)));
if (backup->wal_block_size != XLOG_BLCKSZ)
ereport(ERROR,
(errcode(ERROR_PG_INCOMPATIBLE),
errmsg("XLOG_BLCKSZ(%d) is not compatible (%d expected)",
backup->wal_block_size, XLOG_BLCKSZ)));
time2iso(timestamp, lengthof(timestamp), backup->start_time);
if (verbose && !check)
{
printf(_("----------------------------------------\n"));
}
/*
* Validate backup files with its size, because load of CRC calculation is
* not light.
*/
pgBackupValidate(backup, true, false, true);
if (backup->backup_mode == BACKUP_MODE_FULL)
elog(INFO, "restoring database files from the full mode backup \"%s\"",
timestamp);
else if (backup->backup_mode == BACKUP_MODE_INCREMENTAL)
elog(INFO, "restoring database files from the incremental mode backup \"%s\"",
timestamp);
/* make directories and symbolic links */
pgBackupGetPath(backup, path, lengthof(path), MKDIRS_SH_FILE);
if (!check)
{
char pwd[MAXPGPATH];
/* keep original directory */
if (getcwd(pwd, sizeof(pwd)) == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not get current working directory: %s", strerror(errno))));
/* create pgdata directory */
dir_create_dir(pgdata, DIR_PERMISSION);
/* change directory to pgdata */
if (chdir(pgdata))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not change directory: %s", strerror(errno))));
/* Execute mkdirs.sh */
ret = system(path);
if (ret != 0)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not execute mkdirs.sh: %s", strerror(errno))));
/* go back to original directory */
if (chdir(pwd))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not change directory: %s", strerror(errno))));
}
/*
* get list of files which need to be restored.
*/
pgBackupGetPath(backup, path, lengthof(path), DATABASE_DIR);
pgBackupGetPath(backup, list_path, lengthof(list_path), DATABASE_FILE_LIST);
files = dir_read_file_list(path, list_path);
for (i = parray_num(files) - 1; i >= 0; i--)
{
pgFile *file = (pgFile *) parray_get(files, i);
/* remove files which are not backed up */
if (file->write_size == BYTES_INVALID)
pgFileFree(parray_remove(files, i));
}
/* restore files into $PGDATA */
for (i = 0; i < parray_num(files); i++)
{
char from_root[MAXPGPATH];
pgFile *file = (pgFile *) parray_get(files, i);
pgBackupGetPath(backup, from_root, lengthof(from_root), DATABASE_DIR);
/* check for interrupt */
if (interrupted)
ereport(FATAL,
(errcode(ERROR_INTERRUPTED),
errmsg("interrupted during restore database")));
/* print progress in verbose mode */
if (verbose && !check)
printf(_("(%d/%lu) %s "), i + 1, (unsigned long) parray_num(files),
file->path + strlen(from_root) + 1);
/* directories are created with mkdirs.sh */
if (S_ISDIR(file->mode))
{
num_skipped++;
if (verbose && !check)
printf(_("directory, skip\n"));
goto show_progress;
}
/* not backed up */
if (file->write_size == BYTES_INVALID)
{
num_skipped++;
if (verbose && !check)
printf(_("not backed up, skip\n"));
goto show_progress;
}
/* restore file */
if (!check)
restore_data_file(from_root, pgdata, file, backup->compress_data);
/* print size of restored file */
if (verbose && !check)
{
printf(_("restored %lu\n"), (unsigned long) file->write_size);
continue;
}
show_progress:
/* print progress in non-verbose format */
if (progress)
{
fprintf(stderr, _("Processed %d of %lu files, skipped %d"),
i + 1, (unsigned long) parray_num(files), num_skipped);
if(i + 1 < (unsigned long) parray_num(files))
fprintf(stderr, "\r");
else
fprintf(stderr, "\n");
}
}
/* Delete files which are not in file list. */
if (!check)
{
parray *files_now;
parray_walk(files, pgFileFree);
parray_free(files);
/* re-read file list to change base path to $PGDATA */
files = dir_read_file_list(pgdata, list_path);
parray_qsort(files, pgFileComparePathDesc);
/* get list of files restored to pgdata */
files_now = parray_new();
dir_list_file(files_now, pgdata, pgdata_exclude, true, false);
/* to delete from leaf, sort in reversed order */
parray_qsort(files_now, pgFileComparePathDesc);
for (i = 0; i < parray_num(files_now); i++)
{
pgFile *file = (pgFile *) parray_get(files_now, i);
/* If the file is not in the file list, delete it */
if (parray_bsearch(files, file, pgFileComparePathDesc) == NULL)
{
if (verbose)
printf(_(" delete %s\n"), file->path + strlen(pgdata) + 1);
pgFileDelete(file);
}
}
parray_walk(files_now, pgFileFree);
parray_free(files_now);
}
/* remove postmaster.pid */
snprintf(path, lengthof(path), "%s/postmaster.pid", pgdata);
if (remove(path) == -1 && errno != ENOENT)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not remove postmaster.pid: %s", strerror(errno))));
/* cleanup */
parray_walk(files, pgFileFree);
parray_free(files);
if (verbose && !check)
printf(_("restore backup completed\n"));
}
/*
* Restore archived WAL by creating symbolic link which linked to backup WAL in
* archive directory.
*/
void
restore_archive_logs(pgBackup *backup, bool is_hard_copy)
{
int i;
int num_skipped = 0;
char timestamp[100];
parray *files;
char path[MAXPGPATH];
char list_path[MAXPGPATH];
char base_path[MAXPGPATH];
time2iso(timestamp, lengthof(timestamp), backup->start_time);
if (verbose && !check)
{
printf(_("----------------------------------------\n"));
}
/*
* Validate backup files with its size, because load of CRC calculation is
* not light.
*/
pgBackupValidate(backup, true, false, false);
elog(INFO,_("restoring WAL files from backup \"%s\""), timestamp);
pgBackupGetPath(backup, list_path, lengthof(list_path), ARCLOG_FILE_LIST);
pgBackupGetPath(backup, base_path, lengthof(list_path), ARCLOG_DIR);
files = dir_read_file_list(base_path, list_path);
for (i = 0; i < parray_num(files); i++)
{
pgFile *file = (pgFile *) parray_get(files, i);
/* check for interrupt */
if (interrupted)
ereport(FATAL,
(errcode(ERROR_INTERRUPTED),
errmsg("interrupted during restore WAL")));
/* print progress */
join_path_components(path, arclog_path, file->path + strlen(base_path) + 1);
if (verbose && !check)
printf(_("(%d/%lu) %s "), i + 1, (unsigned long) parray_num(files),
file->path + strlen(base_path) + 1);
/* skip files which are not in backup */
if (file->write_size == BYTES_INVALID)
{
if (verbose && !check)
printf(_("skip(not backed up)\n"));
goto show_progress;
}
/*
* skip timeline history files because timeline history files will be
* restored from $BACKUP_PATH/timeline_history.
*/
if (strstr(file->path, ".history") ==
file->path + strlen(file->path) - strlen(".history"))
{
if (verbose && !check)
printf(_("skip(timeline history)\n"));
goto show_progress;
}
if (!check)
{
if (backup->compress_data)
{
copy_file(base_path, arclog_path, file, DECOMPRESSION);
if (verbose)
printf(_("decompressed\n"));
goto show_progress;
}
/* even same file exist, use backup file */
if ((remove(path) == -1) && errno != ENOENT)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not remove file \"%s\": %s", path, strerror(errno))));
if (!is_hard_copy)
{
/* create symlink */
if ((symlink(file->path, path) == -1))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not create link to \"%s\": %s",
file->path, strerror(errno))));
if (verbose)
printf(_("linked\n"));
}
else
{
/* create hard-copy */
if (!copy_file(base_path, arclog_path, file, NO_COMPRESSION))
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not copy to \"%s\": %s",
file->path, strerror(errno))));
if (verbose)
printf(_("copied\n"));
}
show_progress:
/* print progress in non-verbose format */
if (progress)
{
fprintf(stderr, _("Processed %d of %lu files, skipped %d"),
i + 1, (unsigned long) parray_num(files), num_skipped);
if(i + 1 < (unsigned long) parray_num(files))
fprintf(stderr, "\r");
else
fprintf(stderr, "\n");
}
}
}
parray_walk(files, pgFileFree);
parray_free(files);
}
static void
add_recovery_related_options(const char *target_time,
const char *target_xid,
const char *target_inclusive,
TimeLineID target_tli,
bool target_tli_latest)
{
char path[MAXPGPATH];
FILE *fp;
if (verbose && !check)
{
printf(_("----------------------------------------\n"));
}
elog(INFO, _("add recovery related options to postgresql.conf"));
if (!check)
{
snprintf(path, lengthof(path), "%s/postgresql.conf", pgdata);
fp = fopen(path, "a");
if (fp == NULL)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open postgresql.conf \"%s\": %s", path,
strerror(errno))));
fprintf(fp, "# added by pg_rman %s\n",
PROGRAM_VERSION);
fprintf(fp, "restore_command = 'cp %s/%%f %%p'\n", arclog_path);
if (target_time)
fprintf(fp, "recovery_target_time = '%s'\n", target_time);
if (target_xid)
fprintf(fp, "recovery_target_xid = '%s'\n", target_xid);
if (target_inclusive)
fprintf(fp, "recovery_target_inclusive = '%s'\n", target_inclusive);
if(target_tli_latest)
fprintf(fp, "recovery_target_timeline = 'latest'\n");
else
fprintf(fp, "recovery_target_timeline = '%u'\n", target_tli);
fclose(fp);
}
}
static void
create_recovery_signal(void)
{
char path[MAXPGPATH];
FILE *fp;
if (verbose && !check)
printf(_("----------------------------------------\n"));
elog(INFO, _("generating recovery.signal"));
if (!check)
{
snprintf(path, lengthof(path), "%s/recovery.signal", pgdata);
fp = fopen(path, "wt");
fprintf(fp, "# recovery.signal generated by pg_rman %s\n",
PROGRAM_VERSION);
fclose(fp);
}
}
static void
backup_online_files(bool re_recovery)
{
char work_path[MAXPGPATH];
char pg_wal_path[MAXPGPATH];
bool files_exist;
parray *files;
if (verbose && !check)
printf(_("----------------------------------------\n"));
elog(INFO, _("copying online WAL files and server log files"));
/* get list of files in $BACKUP_PATH/backup/pg_wal */
files = parray_new();
snprintf(work_path, lengthof(work_path), "%s/%s/%s", backup_path,
RESTORE_WORK_DIR, PG_XLOG_DIR);
dir_list_file(files, work_path, NULL, true, false);
files_exist = parray_num(files) > 0;
parray_walk(files, pgFileFree);
parray_free(files);
/* If files exist in RESTORE_WORK_DIR and not re-recovery, use them. */
if (files_exist && !re_recovery)
{
if (verbose)
printf(_("online WALs have been already backed up, use them.\n"));
return;
}
/* backup online WAL */
snprintf(pg_wal_path, lengthof(pg_wal_path), "%s/pg_wal", pgdata);
snprintf(work_path, lengthof(work_path), "%s/%s/%s", backup_path,
RESTORE_WORK_DIR, PG_XLOG_DIR);
dir_create_dir(work_path, DIR_PERMISSION);
dir_copy_files(pg_wal_path, work_path);
/* backup serverlog */
snprintf(work_path, lengthof(work_path), "%s/%s/%s", backup_path,
RESTORE_WORK_DIR, SRVLOG_DIR);
dir_create_dir(work_path, DIR_PERMISSION);
dir_copy_files(srvlog_path, work_path);
}
static void
restore_online_files(void)
{
int i;
int num_skipped = 0;
char root_backup[MAXPGPATH];
parray *files_backup;
/* get list of files in $BACKUP_PATH/backup/pg_wal */
files_backup = parray_new();
snprintf(root_backup, lengthof(root_backup), "%s/%s/%s", backup_path,
RESTORE_WORK_DIR, PG_XLOG_DIR);
dir_list_file(files_backup, root_backup, NULL, true, false);
if (verbose && !check)
{
printf(_("----------------------------------------\n"));
}
elog(INFO, _("restoring online WAL files and server log files"));
/* restore online WAL */
for (i = 0; i < parray_num(files_backup); i++)
{
pgFile *file = (pgFile *) parray_get(files_backup, i);
if (S_ISDIR(file->mode))
{
char to_path[MAXPGPATH];
snprintf(to_path, lengthof(to_path), "%s/%s/%s", pgdata,
PG_XLOG_DIR, file->path + strlen(root_backup) + 1);
if (verbose && !check)
printf(_("create directory \"%s\"\n"),
file->path + strlen(root_backup) + 1);
if (!check)
dir_create_dir(to_path, DIR_PERMISSION);
goto show_progress;
}
else if(S_ISREG(file->mode))
{
char to_root[MAXPGPATH];
join_path_components(to_root, pgdata, PG_XLOG_DIR);
if (verbose && !check)
printf(_("restore \"%s\"\n"),
file->path + strlen(root_backup) + 1);
if (!check)
copy_file(root_backup, to_root, file, NO_COMPRESSION);
}
show_progress:
/* print progress in non-verbose format */
if (progress)
{
fprintf(stderr, _("Processed %d of %lu files, skipped %d"),
i + 1, (unsigned long) parray_num(files_backup), num_skipped);
if(i + 1 < (unsigned long) parray_num(files_backup))
fprintf(stderr, "\r");
else
fprintf(stderr, "\n");
}
}
/* cleanup */
parray_walk(files_backup, pgFileFree);
parray_free(files_backup);
}
/*
* Try to read a timeline's history file.
*
* If successful, return the list of component pgTimeLine (the ancestor
* timelines followed by target timeline). If we can't find the history file,
* assume that the timeline has no parents, and return a list of just the
* specified timeline ID.
* based on readTimeLineHistory() in xlog.c
*/
static parray *
readTimeLineHistory(TimeLineID targetTLI)
{
parray *result;
char path[MAXPGPATH];
char fline[MAXPGPATH];
FILE *fd;
pgTimeLine *timeline;
pgTimeLine *last_timeline = NULL;
int i;
result = parray_new();
/* search from arclog_path first */
snprintf(path, lengthof(path), "%s/%08X.history", arclog_path,
targetTLI);
fd = fopen(path, "rt");
if (fd == NULL)
{
if (errno != ENOENT)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open file \"%s\": %s", path,
strerror(errno))));
/* search from restore work directory next */
snprintf(path, lengthof(path), "%s/%s/%s/%08X.history", backup_path,
RESTORE_WORK_DIR, PG_XLOG_DIR, targetTLI);
fd = fopen(path, "rt");
if (fd == NULL)
{
if (errno != ENOENT)
ereport(ERROR,
(errcode(ERROR_SYSTEM),
errmsg("could not open file \"%s\": %s", path,
strerror(errno))));
}
}
/*
* Parse the file...
*/
while (fd && fgets(fline, sizeof(fline), fd) != NULL)
{
/* skip leading whitespaces and check for # comment */
char *ptr;
char *endptr;
uint32 xlogid, xrecoff;
for (ptr = fline; *ptr; ptr++)
{
if (!IsSpace(*ptr))
break;
}
if (*ptr == '\0' || *ptr == '#')
continue;
timeline = pgut_new(pgTimeLine);
timeline->tli = 0;
timeline->end = 0;
/* expect a numeric timeline ID as first field of line */
timeline->tli = (TimeLineID) strtoul(ptr, &endptr, 0);
if (endptr == ptr)
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("syntax error(timeline ID) in history file: %s", fline)));
if (last_timeline && timeline->tli <= last_timeline->tli)
ereport(ERROR,
(errcode(ERROR_CORRUPTED),
errmsg("timeline IDs must be in increasing sequence, but not")));
/* Build list with newest item first */
parray_insert(result, 0, timeline);
last_timeline = timeline;