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postgresql/src/bin/pg_basebackup/pg_basebackup.c

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/*-------------------------------------------------------------------------
*
* pg_basebackup.c - receive a base backup using streaming replication protocol
*
* Author: Magnus Hagander <magnus@hagander.net>
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/bin/pg_basebackup/pg_basebackup.c
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_LIBZ
#include <zlib.h>
#endif
#include "access/xlog_internal.h"
#include "common/file_perm.h"
#include "common/file_utils.h"
#include "common/logging.h"
#include "common/string.h"
#include "fe_utils/recovery_gen.h"
#include "fe_utils/string_utils.h"
#include "getopt_long.h"
#include "libpq-fe.h"
#include "pgtar.h"
#include "pgtime.h"
#include "pqexpbuffer.h"
#include "receivelog.h"
#include "replication/basebackup.h"
#include "streamutil.h"
#define ERRCODE_DATA_CORRUPTED "XX001"
typedef struct TablespaceListCell
{
struct TablespaceListCell *next;
char old_dir[MAXPGPATH];
char new_dir[MAXPGPATH];
} TablespaceListCell;
typedef struct TablespaceList
{
TablespaceListCell *head;
TablespaceListCell *tail;
} TablespaceList;
/*
* pg_xlog has been renamed to pg_wal in version 10. This version number
* should be compared with PQserverVersion().
*/
#define MINIMUM_VERSION_FOR_PG_WAL 100000
/*
* Temporary replication slots are supported from version 10.
*/
#define MINIMUM_VERSION_FOR_TEMP_SLOTS 100000
/*
* Different ways to include WAL
*/
typedef enum
{
NO_WAL,
FETCH_WAL,
STREAM_WAL
} IncludeWal;
/* Global options */
static char *basedir = NULL;
static TablespaceList tablespace_dirs = {NULL, NULL};
static char *xlog_dir = NULL;
static char format = 'p'; /* p(lain)/t(ar) */
static char *label = "pg_basebackup base backup";
static bool noclean = false;
static bool checksum_failure = false;
static bool showprogress = false;
static int verbose = 0;
static int compresslevel = 0;
static IncludeWal includewal = STREAM_WAL;
static bool fastcheckpoint = false;
static bool writerecoveryconf = false;
static bool do_sync = true;
static int standby_message_timeout = 10 * 1000; /* 10 sec = default */
static pg_time_t last_progress_report = 0;
static int32 maxrate = 0; /* no limit by default */
static char *replication_slot = NULL;
static bool temp_replication_slot = true;
static bool create_slot = false;
static bool no_slot = false;
static bool verify_checksums = true;
static bool success = false;
static bool made_new_pgdata = false;
static bool found_existing_pgdata = false;
static bool made_new_xlogdir = false;
static bool found_existing_xlogdir = false;
static bool made_tablespace_dirs = false;
static bool found_tablespace_dirs = false;
/* Progress counters */
static uint64 totalsize_kb;
static uint64 totaldone;
static int tablespacecount;
/* Pipe to communicate with background wal receiver process */
#ifndef WIN32
static int bgpipe[2] = {-1, -1};
#endif
/* Handle to child process */
static pid_t bgchild = -1;
static bool in_log_streamer = false;
/* End position for xlog streaming, empty string if unknown yet */
static XLogRecPtr xlogendptr;
#ifndef WIN32
static int has_xlogendptr = 0;
#else
static volatile LONG has_xlogendptr = 0;
#endif
/* Contents of configuration file to be generated */
static PQExpBuffer recoveryconfcontents = NULL;
/* Function headers */
static void usage(void);
static void verify_dir_is_empty_or_create(char *dirname, bool *created, bool *found);
static void progress_report(int tablespacenum, const char *filename, bool force);
static void ReceiveTarFile(PGconn *conn, PGresult *res, int rownum);
static void ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum);
static void BaseBackup(void);
static bool reached_end_position(XLogRecPtr segendpos, uint32 timeline,
bool segment_finished);
static const char *get_tablespace_mapping(const char *dir);
static void tablespace_list_append(const char *arg);
static void
cleanup_directories_atexit(void)
{
if (success || in_log_streamer)
return;
if (!noclean && !checksum_failure)
{
if (made_new_pgdata)
{
pg_log_info("removing data directory \"%s\"", basedir);
if (!rmtree(basedir, true))
pg_log_error("failed to remove data directory");
}
else if (found_existing_pgdata)
{
pg_log_info("removing contents of data directory \"%s\"", basedir);
if (!rmtree(basedir, false))
pg_log_error("failed to remove contents of data directory");
}
if (made_new_xlogdir)
{
pg_log_info("removing WAL directory \"%s\"", xlog_dir);
if (!rmtree(xlog_dir, true))
pg_log_error("failed to remove WAL directory");
}
else if (found_existing_xlogdir)
{
pg_log_info("removing contents of WAL directory \"%s\"", xlog_dir);
if (!rmtree(xlog_dir, false))
pg_log_error("failed to remove contents of WAL directory");
}
}
else
{
if ((made_new_pgdata || found_existing_pgdata) && !checksum_failure)
pg_log_info("data directory \"%s\" not removed at user's request", basedir);
if (made_new_xlogdir || found_existing_xlogdir)
pg_log_info("WAL directory \"%s\" not removed at user's request", xlog_dir);
}
if ((made_tablespace_dirs || found_tablespace_dirs) && !checksum_failure)
pg_log_info("changes to tablespace directories will not be undone");
}
static void
disconnect_atexit(void)
{
if (conn != NULL)
PQfinish(conn);
}
#ifndef WIN32
/*
* On windows, our background thread dies along with the process. But on
* Unix, if we have started a subprocess, we want to kill it off so it
* doesn't remain running trying to stream data.
*/
static void
kill_bgchild_atexit(void)
{
if (bgchild > 0)
kill(bgchild, SIGTERM);
}
#endif
/*
* Split argument into old_dir and new_dir and append to tablespace mapping
* list.
*/
static void
tablespace_list_append(const char *arg)
{
TablespaceListCell *cell = (TablespaceListCell *) pg_malloc0(sizeof(TablespaceListCell));
char *dst;
char *dst_ptr;
const char *arg_ptr;
dst_ptr = dst = cell->old_dir;
for (arg_ptr = arg; *arg_ptr; arg_ptr++)
{
if (dst_ptr - dst >= MAXPGPATH)
{
pg_log_error("directory name too long");
exit(1);
}
if (*arg_ptr == '\\' && *(arg_ptr + 1) == '=')
; /* skip backslash escaping = */
else if (*arg_ptr == '=' && (arg_ptr == arg || *(arg_ptr - 1) != '\\'))
{
if (*cell->new_dir)
{
pg_log_error("multiple \"=\" signs in tablespace mapping");
exit(1);
}
else
dst = dst_ptr = cell->new_dir;
}
else
*dst_ptr++ = *arg_ptr;
}
if (!*cell->old_dir || !*cell->new_dir)
{
pg_log_error("invalid tablespace mapping format \"%s\", must be \"OLDDIR=NEWDIR\"", arg);
exit(1);
}
/*
* This check isn't absolutely necessary. But all tablespaces are created
* with absolute directories, so specifying a non-absolute path here would
* just never match, possibly confusing users. It's also good to be
* consistent with the new_dir check.
*/
if (!is_absolute_path(cell->old_dir))
{
pg_log_error("old directory is not an absolute path in tablespace mapping: %s",
cell->old_dir);
exit(1);
}
if (!is_absolute_path(cell->new_dir))
{
pg_log_error("new directory is not an absolute path in tablespace mapping: %s",
cell->new_dir);
exit(1);
}
/*
* Comparisons done with these values should involve similarly
* canonicalized path values. This is particularly sensitive on Windows
* where path values may not necessarily use Unix slashes.
*/
canonicalize_path(cell->old_dir);
canonicalize_path(cell->new_dir);
if (tablespace_dirs.tail)
tablespace_dirs.tail->next = cell;
else
tablespace_dirs.head = cell;
tablespace_dirs.tail = cell;
}
#ifdef HAVE_LIBZ
static const char *
get_gz_error(gzFile gzf)
{
int errnum;
const char *errmsg;
errmsg = gzerror(gzf, &errnum);
if (errnum == Z_ERRNO)
return strerror(errno);
else
return errmsg;
}
#endif
static void
usage(void)
{
printf(_("%s takes a base backup of a running PostgreSQL server.\n\n"),
progname);
printf(_("Usage:\n"));
printf(_(" %s [OPTION]...\n"), progname);
printf(_("\nOptions controlling the output:\n"));
printf(_(" -D, --pgdata=DIRECTORY receive base backup into directory\n"));
printf(_(" -F, --format=p|t output format (plain (default), tar)\n"));
printf(_(" -r, --max-rate=RATE maximum transfer rate to transfer data directory\n"
" (in kB/s, or use suffix \"k\" or \"M\")\n"));
printf(_(" -R, --write-recovery-conf\n"
" write configuration for replication\n"));
printf(_(" -T, --tablespace-mapping=OLDDIR=NEWDIR\n"
" relocate tablespace in OLDDIR to NEWDIR\n"));
printf(_(" --waldir=WALDIR location for the write-ahead log directory\n"));
printf(_(" -X, --wal-method=none|fetch|stream\n"
" include required WAL files with specified method\n"));
printf(_(" -z, --gzip compress tar output\n"));
printf(_(" -Z, --compress=0-9 compress tar output with given compression level\n"));
printf(_("\nGeneral options:\n"));
printf(_(" -c, --checkpoint=fast|spread\n"
" set fast or spread checkpointing\n"));
printf(_(" -C, --create-slot create replication slot\n"));
printf(_(" -l, --label=LABEL set backup label\n"));
printf(_(" -n, --no-clean do not clean up after errors\n"));
printf(_(" -N, --no-sync do not wait for changes to be written safely to disk\n"));
printf(_(" -P, --progress show progress information\n"));
printf(_(" -S, --slot=SLOTNAME replication slot to use\n"));
printf(_(" -v, --verbose output verbose messages\n"));
printf(_(" -V, --version output version information, then exit\n"));
printf(_(" --no-slot prevent creation of temporary replication slot\n"));
printf(_(" --no-verify-checksums\n"
" do not verify checksums\n"));
printf(_(" -?, --help show this help, then exit\n"));
printf(_("\nConnection options:\n"));
printf(_(" -d, --dbname=CONNSTR connection string\n"));
printf(_(" -h, --host=HOSTNAME database server host or socket directory\n"));
printf(_(" -p, --port=PORT database server port number\n"));
printf(_(" -s, --status-interval=INTERVAL\n"
" time between status packets sent to server (in seconds)\n"));
printf(_(" -U, --username=NAME connect as specified database user\n"));
printf(_(" -w, --no-password never prompt for password\n"));
printf(_(" -W, --password force password prompt (should happen automatically)\n"));
printf(_("\nReport bugs to <pgsql-bugs@lists.postgresql.org>.\n"));
}
/*
* Called in the background process every time data is received.
* On Unix, we check to see if there is any data on our pipe
* (which would mean we have a stop position), and if it is, check if
* it is time to stop.
* On Windows, we are in a single process, so we can just check if it's
* time to stop.
*/
static bool
reached_end_position(XLogRecPtr segendpos, uint32 timeline,
bool segment_finished)
{
if (!has_xlogendptr)
{
#ifndef WIN32
fd_set fds;
struct timeval tv;
int r;
/*
* Don't have the end pointer yet - check our pipe to see if it has
* been sent yet.
*/
FD_ZERO(&fds);
FD_SET(bgpipe[0], &fds);
MemSet(&tv, 0, sizeof(tv));
r = select(bgpipe[0] + 1, &fds, NULL, NULL, &tv);
if (r == 1)
{
char xlogend[64];
uint32 hi,
lo;
MemSet(xlogend, 0, sizeof(xlogend));
r = read(bgpipe[0], xlogend, sizeof(xlogend) - 1);
if (r < 0)
{
pg_log_error("could not read from ready pipe: %m");
exit(1);
}
if (sscanf(xlogend, "%X/%X", &hi, &lo) != 2)
{
pg_log_error("could not parse write-ahead log location \"%s\"",
xlogend);
exit(1);
}
xlogendptr = ((uint64) hi) << 32 | lo;
has_xlogendptr = 1;
/*
* Fall through to check if we've reached the point further
* already.
*/
}
else
{
/*
* No data received on the pipe means we don't know the end
* position yet - so just say it's not time to stop yet.
*/
return false;
}
#else
/*
* On win32, has_xlogendptr is set by the main thread, so if it's not
* set here, we just go back and wait until it shows up.
*/
return false;
#endif
}
/*
* At this point we have an end pointer, so compare it to the current
* position to figure out if it's time to stop.
*/
if (segendpos >= xlogendptr)
return true;
/*
* Have end pointer, but haven't reached it yet - so tell the caller to
* keep streaming.
*/
return false;
}
typedef struct
{
PGconn *bgconn;
XLogRecPtr startptr;
char xlog[MAXPGPATH]; /* directory or tarfile depending on mode */
char *sysidentifier;
int timeline;
} logstreamer_param;
static int
LogStreamerMain(logstreamer_param *param)
{
StreamCtl stream;
in_log_streamer = true;
MemSet(&stream, 0, sizeof(stream));
stream.startpos = param->startptr;
stream.timeline = param->timeline;
stream.sysidentifier = param->sysidentifier;
stream.stream_stop = reached_end_position;
#ifndef WIN32
stream.stop_socket = bgpipe[0];
#else
stream.stop_socket = PGINVALID_SOCKET;
#endif
stream.standby_message_timeout = standby_message_timeout;
stream.synchronous = false;
/* fsync happens at the end of pg_basebackup for all data */
stream.do_sync = false;
stream.mark_done = true;
stream.partial_suffix = NULL;
stream.replication_slot = replication_slot;
if (format == 'p')
stream.walmethod = CreateWalDirectoryMethod(param->xlog, 0,
stream.do_sync);
else
stream.walmethod = CreateWalTarMethod(param->xlog, compresslevel,
stream.do_sync);
if (!ReceiveXlogStream(param->bgconn, &stream))
/*
* Any errors will already have been reported in the function process,
* but we need to tell the parent that we didn't shutdown in a nice
* way.
*/
return 1;
if (!stream.walmethod->finish())
{
pg_log_error("could not finish writing WAL files: %m");
return 1;
}
PQfinish(param->bgconn);
if (format == 'p')
FreeWalDirectoryMethod();
else
FreeWalTarMethod();
pg_free(stream.walmethod);
return 0;
}
/*
* Initiate background process for receiving xlog during the backup.
* The background stream will use its own database connection so we can
* stream the logfile in parallel with the backups.
*/
static void
StartLogStreamer(char *startpos, uint32 timeline, char *sysidentifier)
{
logstreamer_param *param;
uint32 hi,
lo;
char statusdir[MAXPGPATH];
param = pg_malloc0(sizeof(logstreamer_param));
param->timeline = timeline;
param->sysidentifier = sysidentifier;
/* Convert the starting position */
if (sscanf(startpos, "%X/%X", &hi, &lo) != 2)
{
pg_log_error("could not parse write-ahead log location \"%s\"",
startpos);
exit(1);
}
param->startptr = ((uint64) hi) << 32 | lo;
/* Round off to even segment position */
param->startptr -= XLogSegmentOffset(param->startptr, WalSegSz);
#ifndef WIN32
/* Create our background pipe */
if (pipe(bgpipe) < 0)
{
pg_log_error("could not create pipe for background process: %m");
exit(1);
}
#endif
/* Get a second connection */
param->bgconn = GetConnection();
if (!param->bgconn)
/* Error message already written in GetConnection() */
exit(1);
/* In post-10 cluster, pg_xlog has been renamed to pg_wal */
snprintf(param->xlog, sizeof(param->xlog), "%s/%s",
basedir,
PQserverVersion(conn) < MINIMUM_VERSION_FOR_PG_WAL ?
"pg_xlog" : "pg_wal");
/* Temporary replication slots are only supported in 10 and newer */
if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_TEMP_SLOTS)
temp_replication_slot = false;
/*
* Create replication slot if requested
*/
if (temp_replication_slot && !replication_slot)
replication_slot = psprintf("pg_basebackup_%d", (int) PQbackendPID(param->bgconn));
if (temp_replication_slot || create_slot)
{
if (!CreateReplicationSlot(param->bgconn, replication_slot, NULL,
temp_replication_slot, true, true, false))
exit(1);
if (verbose)
{
if (temp_replication_slot)
pg_log_info("created temporary replication slot \"%s\"",
replication_slot);
else
pg_log_info("created replication slot \"%s\"",
replication_slot);
}
}
if (format == 'p')
{
/*
* Create pg_wal/archive_status or pg_xlog/archive_status (and thus
* pg_wal or pg_xlog) depending on the target server so we can write
* to basedir/pg_wal or basedir/pg_xlog as the directory entry in the
* tar file may arrive later.
*/
snprintf(statusdir, sizeof(statusdir), "%s/%s/archive_status",
basedir,
PQserverVersion(conn) < MINIMUM_VERSION_FOR_PG_WAL ?
"pg_xlog" : "pg_wal");
if (pg_mkdir_p(statusdir, pg_dir_create_mode) != 0 && errno != EEXIST)
{
pg_log_error("could not create directory \"%s\": %m", statusdir);
exit(1);
}
}
/*
* Start a child process and tell it to start streaming. On Unix, this is
* a fork(). On Windows, we create a thread.
*/
#ifndef WIN32
bgchild = fork();
if (bgchild == 0)
{
/* in child process */
exit(LogStreamerMain(param));
}
else if (bgchild < 0)
{
pg_log_error("could not create background process: %m");
exit(1);
}
/*
* Else we are in the parent process and all is well.
*/
atexit(kill_bgchild_atexit);
#else /* WIN32 */
bgchild = _beginthreadex(NULL, 0, (void *) LogStreamerMain, param, 0, NULL);
if (bgchild == 0)
{
pg_log_error("could not create background thread: %m");
exit(1);
}
#endif
}
/*
* Verify that the given directory exists and is empty. If it does not
* exist, it is created. If it exists but is not empty, an error will
* be given and the process ended.
*/
static void
verify_dir_is_empty_or_create(char *dirname, bool *created, bool *found)
{
switch (pg_check_dir(dirname))
{
case 0:
/*
* Does not exist, so create
*/
if (pg_mkdir_p(dirname, pg_dir_create_mode) == -1)
{
pg_log_error("could not create directory \"%s\": %m", dirname);
exit(1);
}
if (created)
*created = true;
return;
case 1:
/*
* Exists, empty
*/
if (found)
*found = true;
return;
case 2:
case 3:
case 4:
/*
* Exists, not empty
*/
pg_log_error("directory \"%s\" exists but is not empty", dirname);
exit(1);
case -1:
/*
* Access problem
*/
pg_log_error("could not access directory \"%s\": %m", dirname);
exit(1);
}
}
/*
* Print a progress report based on the global variables. If verbose output
* is enabled, also print the current file name.
*
* Progress report is written at maximum once per second, unless the
* force parameter is set to true.
*/
static void
progress_report(int tablespacenum, const char *filename, bool force)
{
int percent;
char totaldone_str[32];
char totalsize_str[32];
pg_time_t now;
if (!showprogress)
return;
now = time(NULL);
if (now == last_progress_report && !force)
return; /* Max once per second */
last_progress_report = now;
percent = totalsize_kb ? (int) ((totaldone / 1024) * 100 / totalsize_kb) : 0;
/*
* Avoid overflowing past 100% or the full size. This may make the total
* size number change as we approach the end of the backup (the estimate
* will always be wrong if WAL is included), but that's better than having
* the done column be bigger than the total.
*/
if (percent > 100)
percent = 100;
if (totaldone / 1024 > totalsize_kb)
totalsize_kb = totaldone / 1024;
/*
* Separate step to keep platform-dependent format code out of
* translatable strings. And we only test for INT64_FORMAT availability
* in snprintf, not fprintf.
*/
snprintf(totaldone_str, sizeof(totaldone_str), INT64_FORMAT,
totaldone / 1024);
snprintf(totalsize_str, sizeof(totalsize_str), INT64_FORMAT, totalsize_kb);
#define VERBOSE_FILENAME_LENGTH 35
if (verbose)
{
if (!filename)
/*
* No filename given, so clear the status line (used for last
* call)
*/
fprintf(stderr,
ngettext("%*s/%s kB (100%%), %d/%d tablespace %*s",
"%*s/%s kB (100%%), %d/%d tablespaces %*s",
tablespacecount),
(int) strlen(totalsize_str),
totaldone_str, totalsize_str,
tablespacenum, tablespacecount,
VERBOSE_FILENAME_LENGTH + 5, "");
else
{
bool truncate = (strlen(filename) > VERBOSE_FILENAME_LENGTH);
fprintf(stderr,
ngettext("%*s/%s kB (%d%%), %d/%d tablespace (%s%-*.*s)",
"%*s/%s kB (%d%%), %d/%d tablespaces (%s%-*.*s)",
tablespacecount),
(int) strlen(totalsize_str),
totaldone_str, totalsize_str, percent,
tablespacenum, tablespacecount,
/* Prefix with "..." if we do leading truncation */
truncate ? "..." : "",
truncate ? VERBOSE_FILENAME_LENGTH - 3 : VERBOSE_FILENAME_LENGTH,
truncate ? VERBOSE_FILENAME_LENGTH - 3 : VERBOSE_FILENAME_LENGTH,
/* Truncate filename at beginning if it's too long */
truncate ? filename + strlen(filename) - VERBOSE_FILENAME_LENGTH + 3 : filename);
}
}
else
fprintf(stderr,
ngettext("%*s/%s kB (%d%%), %d/%d tablespace",
"%*s/%s kB (%d%%), %d/%d tablespaces",
tablespacecount),
(int) strlen(totalsize_str),
totaldone_str, totalsize_str, percent,
tablespacenum, tablespacecount);
if (isatty(fileno(stderr)))
fprintf(stderr, "\r");
else
fprintf(stderr, "\n");
}
static int32
parse_max_rate(char *src)
{
double result;
char *after_num;
char *suffix = NULL;
errno = 0;
result = strtod(src, &after_num);
if (src == after_num)
{
pg_log_error("transfer rate \"%s\" is not a valid value", src);
exit(1);
}
if (errno != 0)
{
pg_log_error("invalid transfer rate \"%s\": %m", src);
exit(1);
}
if (result <= 0)
{
/*
* Reject obviously wrong values here.
*/
pg_log_error("transfer rate must be greater than zero");
exit(1);
}
/*
* Evaluate suffix, after skipping over possible whitespace. Lack of
* suffix means kilobytes.
*/
while (*after_num != '\0' && isspace((unsigned char) *after_num))
after_num++;
if (*after_num != '\0')
{
suffix = after_num;
if (*after_num == 'k')
{
/* kilobyte is the expected unit. */
after_num++;
}
else if (*after_num == 'M')
{
after_num++;
result *= 1024.0;
}
}
/* The rest can only consist of white space. */
while (*after_num != '\0' && isspace((unsigned char) *after_num))
after_num++;
if (*after_num != '\0')
{
pg_log_error("invalid --max-rate unit: \"%s\"", suffix);
exit(1);
}
/* Valid integer? */
if ((uint64) result != (uint64) ((uint32) result))
{
pg_log_error("transfer rate \"%s\" exceeds integer range", src);
exit(1);
}
/*
* The range is checked on the server side too, but avoid the server
* connection if a nonsensical value was passed.
*/
if (result < MAX_RATE_LOWER || result > MAX_RATE_UPPER)
{
pg_log_error("transfer rate \"%s\" is out of range", src);
exit(1);
}
return (int32) result;
}
/*
* Write a piece of tar data
*/
static void
writeTarData(
#ifdef HAVE_LIBZ
gzFile ztarfile,
#endif
FILE *tarfile, char *buf, int r, char *current_file)
{
#ifdef HAVE_LIBZ
if (ztarfile != NULL)
{
if (gzwrite(ztarfile, buf, r) != r)
{
pg_log_error("could not write to compressed file \"%s\": %s",
current_file, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
{
if (fwrite(buf, r, 1, tarfile) != 1)
{
pg_log_error("could not write to file \"%s\": %m", current_file);
exit(1);
}
}
}
#ifdef HAVE_LIBZ
#define WRITE_TAR_DATA(buf, sz) writeTarData(ztarfile, tarfile, buf, sz, filename)
#else
#define WRITE_TAR_DATA(buf, sz) writeTarData(tarfile, buf, sz, filename)
#endif
/*
* Receive a tar format file from the connection to the server, and write
* the data from this file directly into a tar file. If compression is
* enabled, the data will be compressed while written to the file.
*
* The file will be named base.tar[.gz] if it's for the main data directory
* or <tablespaceoid>.tar[.gz] if it's for another tablespace.
*
* No attempt to inspect or validate the contents of the file is done.
*/
static void
ReceiveTarFile(PGconn *conn, PGresult *res, int rownum)
{
char filename[MAXPGPATH];
char *copybuf = NULL;
FILE *tarfile = NULL;
char tarhdr[512];
bool basetablespace = PQgetisnull(res, rownum, 0);
bool in_tarhdr = true;
bool skip_file = false;
bool is_recovery_guc_supported = true;
bool is_postgresql_auto_conf = false;
bool found_postgresql_auto_conf = false;
int file_padding_len = 0;
size_t tarhdrsz = 0;
pgoff_t filesz = 0;
#ifdef HAVE_LIBZ
gzFile ztarfile = NULL;
#endif
/* recovery.conf is integrated into postgresql.conf in 12 and newer */
if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_RECOVERY_GUC)
is_recovery_guc_supported = false;
if (basetablespace)
{
/*
* Base tablespaces
*/
if (strcmp(basedir, "-") == 0)
{
#ifdef WIN32
_setmode(fileno(stdout), _O_BINARY);
#endif
#ifdef HAVE_LIBZ
if (compresslevel != 0)
{
ztarfile = gzdopen(dup(fileno(stdout)), "wb");
if (gzsetparams(ztarfile, compresslevel,
Z_DEFAULT_STRATEGY) != Z_OK)
{
pg_log_error("could not set compression level %d: %s",
compresslevel, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
tarfile = stdout;
strcpy(filename, "-");
}
else
{
#ifdef HAVE_LIBZ
if (compresslevel != 0)
{
snprintf(filename, sizeof(filename), "%s/base.tar.gz", basedir);
ztarfile = gzopen(filename, "wb");
if (gzsetparams(ztarfile, compresslevel,
Z_DEFAULT_STRATEGY) != Z_OK)
{
pg_log_error("could not set compression level %d: %s",
compresslevel, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
{
snprintf(filename, sizeof(filename), "%s/base.tar", basedir);
tarfile = fopen(filename, "wb");
}
}
}
else
{
/*
* Specific tablespace
*/
#ifdef HAVE_LIBZ
if (compresslevel != 0)
{
snprintf(filename, sizeof(filename), "%s/%s.tar.gz", basedir,
PQgetvalue(res, rownum, 0));
ztarfile = gzopen(filename, "wb");
if (gzsetparams(ztarfile, compresslevel,
Z_DEFAULT_STRATEGY) != Z_OK)
{
pg_log_error("could not set compression level %d: %s",
compresslevel, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
{
snprintf(filename, sizeof(filename), "%s/%s.tar", basedir,
PQgetvalue(res, rownum, 0));
tarfile = fopen(filename, "wb");
}
}
#ifdef HAVE_LIBZ
if (compresslevel != 0)
{
if (!ztarfile)
{
/* Compression is in use */
pg_log_error("could not create compressed file \"%s\": %s",
filename, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
{
/* Either no zlib support, or zlib support but compresslevel = 0 */
if (!tarfile)
{
pg_log_error("could not create file \"%s\": %m", filename);
exit(1);
}
}
/*
* Get the COPY data stream
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COPY_OUT)
{
pg_log_error("could not get COPY data stream: %s",
PQerrorMessage(conn));
exit(1);
}
while (1)
{
int r;
if (copybuf != NULL)
{
PQfreemem(copybuf);
copybuf = NULL;
}
r = PQgetCopyData(conn, &copybuf, 0);
if (r == -1)
{
/*
* End of chunk. If requested, and this is the base tablespace,
* write configuration file into the tarfile. When done, close the
* file (but not stdout).
*
* Also, write two completely empty blocks at the end of the tar
* file, as required by some tar programs.
*/
char zerobuf[1024];
MemSet(zerobuf, 0, sizeof(zerobuf));
if (basetablespace && writerecoveryconf)
{
char header[512];
/*
* If postgresql.auto.conf has not been found in the streamed
* data, add recovery configuration to postgresql.auto.conf if
* recovery parameters are GUCs. If the instance connected to
* is older than 12, create recovery.conf with this data
* otherwise.
*/
if (!found_postgresql_auto_conf || !is_recovery_guc_supported)
{
int padding;
tarCreateHeader(header,
is_recovery_guc_supported ? "postgresql.auto.conf" : "recovery.conf",
NULL,
recoveryconfcontents->len,
pg_file_create_mode, 04000, 02000,
time(NULL));
padding = ((recoveryconfcontents->len + 511) & ~511) - recoveryconfcontents->len;
WRITE_TAR_DATA(header, sizeof(header));
WRITE_TAR_DATA(recoveryconfcontents->data,
recoveryconfcontents->len);
if (padding)
WRITE_TAR_DATA(zerobuf, padding);
}
/*
* standby.signal is supported only if recovery parameters are
* GUCs.
*/
if (is_recovery_guc_supported)
{
tarCreateHeader(header, "standby.signal", NULL,
0, /* zero-length file */
pg_file_create_mode, 04000, 02000,
time(NULL));
WRITE_TAR_DATA(header, sizeof(header));
WRITE_TAR_DATA(zerobuf, 511);
}
}
/* 2 * 512 bytes empty data at end of file */
WRITE_TAR_DATA(zerobuf, sizeof(zerobuf));
#ifdef HAVE_LIBZ
if (ztarfile != NULL)
{
if (gzclose(ztarfile) != 0)
{
pg_log_error("could not close compressed file \"%s\": %s",
filename, get_gz_error(ztarfile));
exit(1);
}
}
else
#endif
{
if (strcmp(basedir, "-") != 0)
{
if (fclose(tarfile) != 0)
{
pg_log_error("could not close file \"%s\": %m",
filename);
exit(1);
}
}
}
break;
}
else if (r == -2)
{
pg_log_error("could not read COPY data: %s",
PQerrorMessage(conn));
exit(1);
}
if (!writerecoveryconf || !basetablespace)
{
/*
* When not writing config file, or when not working on the base
* tablespace, we never have to look for an existing configuration
* file in the stream.
*/
WRITE_TAR_DATA(copybuf, r);
}
else
{
/*
* Look for a config file in the existing tar stream. If it's
* there, we must skip it so we can later overwrite it with our
* own version of the file.
*
* To do this, we have to process the individual files inside the
* TAR stream. The stream consists of a header and zero or more
* chunks, all 512 bytes long. The stream from the server is
* broken up into smaller pieces, so we have to track the size of
* the files to find the next header structure.
*/
int rr = r;
int pos = 0;
while (rr > 0)
{
if (in_tarhdr)
{
/*
* We're currently reading a header structure inside the
* TAR stream, i.e. the file metadata.
*/
if (tarhdrsz < 512)
{
/*
* Copy the header structure into tarhdr in case the
* header is not aligned to 512 bytes or it's not
* returned in whole by the last PQgetCopyData call.
*/
int hdrleft;
int bytes2copy;
hdrleft = 512 - tarhdrsz;
bytes2copy = (rr > hdrleft ? hdrleft : rr);
memcpy(&tarhdr[tarhdrsz], copybuf + pos, bytes2copy);
rr -= bytes2copy;
pos += bytes2copy;
tarhdrsz += bytes2copy;
}
else
{
/*
* We have the complete header structure in tarhdr,
* look at the file metadata: we may want append
* recovery info into postgresql.auto.conf and skip
* standby.signal file if recovery parameters are
* integrated as GUCs, and recovery.conf otherwise. In
* both cases we must calculate tar padding.
*/
if (is_recovery_guc_supported)
{
skip_file = (strcmp(&tarhdr[0], "standby.signal") == 0);
is_postgresql_auto_conf = (strcmp(&tarhdr[0], "postgresql.auto.conf") == 0);
}
else
skip_file = (strcmp(&tarhdr[0], "recovery.conf") == 0);
filesz = read_tar_number(&tarhdr[124], 12);
file_padding_len = ((filesz + 511) & ~511) - filesz;
if (is_recovery_guc_supported &&
is_postgresql_auto_conf &&
writerecoveryconf)
{
/* replace tar header */
char header[512];
tarCreateHeader(header, "postgresql.auto.conf", NULL,
filesz + recoveryconfcontents->len,
pg_file_create_mode, 04000, 02000,
time(NULL));
WRITE_TAR_DATA(header, sizeof(header));
}
else
{
/* copy stream with padding */
filesz += file_padding_len;
if (!skip_file)
{
/*
* If we're not skipping the file, write the
* tar header unmodified.
*/
WRITE_TAR_DATA(tarhdr, 512);
}
}
/* Next part is the file, not the header */
in_tarhdr = false;
}
}
else
{
/*
* We're processing a file's contents.
*/
if (filesz > 0)
{
/*
* We still have data to read (and possibly write).
*/
int bytes2write;
bytes2write = (filesz > rr ? rr : filesz);
if (!skip_file)
WRITE_TAR_DATA(copybuf + pos, bytes2write);
rr -= bytes2write;
pos += bytes2write;
filesz -= bytes2write;
}
else if (is_recovery_guc_supported &&
is_postgresql_auto_conf &&
writerecoveryconf)
{
/* append recovery config to postgresql.auto.conf */
int padding;
int tailsize;
tailsize = (512 - file_padding_len) + recoveryconfcontents->len;
padding = ((tailsize + 511) & ~511) - tailsize;
WRITE_TAR_DATA(recoveryconfcontents->data, recoveryconfcontents->len);
if (padding)
{
char zerobuf[512];
MemSet(zerobuf, 0, sizeof(zerobuf));
WRITE_TAR_DATA(zerobuf, padding);
}
/* skip original file padding */
is_postgresql_auto_conf = false;
skip_file = true;
filesz += file_padding_len;
found_postgresql_auto_conf = true;
}
else
{
/*
* No more data in the current file, the next piece of
* data (if any) will be a new file header structure.
*/
in_tarhdr = true;
skip_file = false;
is_postgresql_auto_conf = false;
tarhdrsz = 0;
filesz = 0;
}
}
}
}
totaldone += r;
progress_report(rownum, filename, false);
} /* while (1) */
progress_report(rownum, filename, true);
if (copybuf != NULL)
PQfreemem(copybuf);
/*
* Do not sync the resulting tar file yet, all files are synced once at
* the end.
*/
}
/*
* Retrieve tablespace path, either relocated or original depending on whether
* -T was passed or not.
*/
static const char *
get_tablespace_mapping(const char *dir)
{
TablespaceListCell *cell;
char canon_dir[MAXPGPATH];
/* Canonicalize path for comparison consistency */
strlcpy(canon_dir, dir, sizeof(canon_dir));
canonicalize_path(canon_dir);
for (cell = tablespace_dirs.head; cell; cell = cell->next)
if (strcmp(canon_dir, cell->old_dir) == 0)
return cell->new_dir;
return dir;
}
/*
* Receive a tar format stream from the connection to the server, and unpack
* the contents of it into a directory. Only files, directories and
* symlinks are supported, no other kinds of special files.
*
* If the data is for the main data directory, it will be restored in the
* specified directory. If it's for another tablespace, it will be restored
* in the original or mapped directory.
*/
static void
ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum)
{
char current_path[MAXPGPATH];
char filename[MAXPGPATH];
const char *mapped_tblspc_path;
pgoff_t current_len_left = 0;
int current_padding = 0;
bool basetablespace;
char *copybuf = NULL;
FILE *file = NULL;
basetablespace = PQgetisnull(res, rownum, 0);
if (basetablespace)
strlcpy(current_path, basedir, sizeof(current_path));
else
strlcpy(current_path,
get_tablespace_mapping(PQgetvalue(res, rownum, 1)),
sizeof(current_path));
/*
* Get the COPY data
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COPY_OUT)
{
pg_log_error("could not get COPY data stream: %s",
PQerrorMessage(conn));
exit(1);
}
while (1)
{
int r;
if (copybuf != NULL)
{
PQfreemem(copybuf);
copybuf = NULL;
}
r = PQgetCopyData(conn, &copybuf, 0);
if (r == -1)
{
/*
* End of chunk
*/
if (file)
fclose(file);
break;
}
else if (r == -2)
{
pg_log_error("could not read COPY data: %s",
PQerrorMessage(conn));
exit(1);
}
if (file == NULL)
{
#ifndef WIN32
int filemode;
#endif
/*
* No current file, so this must be the header for a new file
*/
if (r != 512)
{
pg_log_error("invalid tar block header size: %d", r);
exit(1);
}
totaldone += 512;
current_len_left = read_tar_number(&copybuf[124], 12);
#ifndef WIN32
/* Set permissions on the file */
filemode = read_tar_number(&copybuf[100], 8);
#endif
/*
* All files are padded up to 512 bytes
*/
current_padding =
((current_len_left + 511) & ~511) - current_len_left;
/*
* First part of header is zero terminated filename
*/
snprintf(filename, sizeof(filename), "%s/%s", current_path,
copybuf);
if (filename[strlen(filename) - 1] == '/')
{
/*
* Ends in a slash means directory or symlink to directory
*/
if (copybuf[156] == '5')
{
/*
* Directory
*/
filename[strlen(filename) - 1] = '\0'; /* Remove trailing slash */
if (mkdir(filename, pg_dir_create_mode) != 0)
{
/*
* When streaming WAL, pg_wal (or pg_xlog for pre-9.6
* clusters) will have been created by the wal
* receiver process. Also, when the WAL directory
* location was specified, pg_wal (or pg_xlog) has
* already been created as a symbolic link before
* starting the actual backup. So just ignore creation
* failures on related directories.
*/
if (!((pg_str_endswith(filename, "/pg_wal") ||
pg_str_endswith(filename, "/pg_xlog") ||
pg_str_endswith(filename, "/archive_status")) &&
errno == EEXIST))
{
pg_log_error("could not create directory \"%s\": %m",
filename);
exit(1);
}
}
#ifndef WIN32
if (chmod(filename, (mode_t) filemode))
pg_log_error("could not set permissions on directory \"%s\": %m",
filename);
#endif
}
else if (copybuf[156] == '2')
{
/*
* Symbolic link
*
* It's most likely a link in pg_tblspc directory, to the
* location of a tablespace. Apply any tablespace mapping
* given on the command line (--tablespace-mapping). (We
* blindly apply the mapping without checking that the
* link really is inside pg_tblspc. We don't expect there
* to be other symlinks in a data directory, but if there
* are, you can call it an undocumented feature that you
* can map them too.)
*/
filename[strlen(filename) - 1] = '\0'; /* Remove trailing slash */
mapped_tblspc_path = get_tablespace_mapping(&copybuf[157]);
if (symlink(mapped_tblspc_path, filename) != 0)
{
pg_log_error("could not create symbolic link from \"%s\" to \"%s\": %m",
filename, mapped_tblspc_path);
exit(1);
}
}
else
{
pg_log_error("unrecognized link indicator \"%c\"",
copybuf[156]);
exit(1);
}
continue; /* directory or link handled */
}
/*
* regular file
*/
file = fopen(filename, "wb");
if (!file)
{
pg_log_error("could not create file \"%s\": %m", filename);
exit(1);
}
#ifndef WIN32
if (chmod(filename, (mode_t) filemode))
pg_log_error("could not set permissions on file \"%s\": %m",
filename);
#endif
if (current_len_left == 0)
{
/*
* Done with this file, next one will be a new tar header
*/
fclose(file);
file = NULL;
continue;
}
} /* new file */
else
{
/*
* Continuing blocks in existing file
*/
if (current_len_left == 0 && r == current_padding)
{
/*
* Received the padding block for this file, ignore it and
* close the file, then move on to the next tar header.
*/
fclose(file);
file = NULL;
totaldone += r;
continue;
}
if (fwrite(copybuf, r, 1, file) != 1)
{
pg_log_error("could not write to file \"%s\": %m", filename);
exit(1);
}
totaldone += r;
progress_report(rownum, filename, false);
current_len_left -= r;
if (current_len_left == 0 && current_padding == 0)
{
/*
* Received the last block, and there is no padding to be
* expected. Close the file and move on to the next tar
* header.
*/
fclose(file);
file = NULL;
continue;
}
} /* continuing data in existing file */
} /* loop over all data blocks */
progress_report(rownum, filename, true);
if (file != NULL)
{
pg_log_error("COPY stream ended before last file was finished");
exit(1);
}
if (copybuf != NULL)
PQfreemem(copybuf);
if (basetablespace && writerecoveryconf)
WriteRecoveryConfig(conn, basedir, recoveryconfcontents);
/*
* No data is synced here, everything is done for all tablespaces at the
* end.
*/
}
static void
BaseBackup(void)
{
PGresult *res;
char *sysidentifier;
TimeLineID latesttli;
TimeLineID starttli;
char *basebkp;
char escaped_label[MAXPGPATH];
char *maxrate_clause = NULL;
int i;
char xlogstart[64];
char xlogend[64];
int minServerMajor,
maxServerMajor;
int serverVersion,
serverMajor;
Assert(conn != NULL);
/*
* Check server version. BASE_BACKUP command was introduced in 9.1, so we
* can't work with servers older than 9.1.
*/
minServerMajor = 901;
maxServerMajor = PG_VERSION_NUM / 100;
serverVersion = PQserverVersion(conn);
serverMajor = serverVersion / 100;
if (serverMajor < minServerMajor || serverMajor > maxServerMajor)
{
const char *serverver = PQparameterStatus(conn, "server_version");
pg_log_error("incompatible server version %s",
serverver ? serverver : "'unknown'");
exit(1);
}
/*
* If WAL streaming was requested, also check that the server is new
* enough for that.
*/
if (includewal == STREAM_WAL && !CheckServerVersionForStreaming(conn))
{
/*
* Error message already written in CheckServerVersionForStreaming(),
* but add a hint about using -X none.
*/
pg_log_info("HINT: use -X none or -X fetch to disable log streaming");
exit(1);
}
/*
* Build contents of configuration file if requested
*/
if (writerecoveryconf)
recoveryconfcontents = GenerateRecoveryConfig(conn, replication_slot);
/*
* Run IDENTIFY_SYSTEM so we can get the timeline
*/
if (!RunIdentifySystem(conn, &sysidentifier, &latesttli, NULL, NULL))
exit(1);
/*
* Start the actual backup
*/
PQescapeStringConn(conn, escaped_label, label, sizeof(escaped_label), &i);
if (maxrate > 0)
maxrate_clause = psprintf("MAX_RATE %u", maxrate);
if (verbose)
pg_log_info("initiating base backup, waiting for checkpoint to complete");
if (showprogress && !verbose)
{
fprintf(stderr, "waiting for checkpoint");
if (isatty(fileno(stderr)))
fprintf(stderr, "\r");
else
fprintf(stderr, "\n");
}
basebkp =
psprintf("BASE_BACKUP LABEL '%s' %s %s %s %s %s %s %s",
escaped_label,
showprogress ? "PROGRESS" : "",
includewal == FETCH_WAL ? "WAL" : "",
fastcheckpoint ? "FAST" : "",
includewal == NO_WAL ? "" : "NOWAIT",
maxrate_clause ? maxrate_clause : "",
format == 't' ? "TABLESPACE_MAP" : "",
verify_checksums ? "" : "NOVERIFY_CHECKSUMS");
if (PQsendQuery(conn, basebkp) == 0)
{
pg_log_error("could not send replication command \"%s\": %s",
"BASE_BACKUP", PQerrorMessage(conn));
exit(1);
}
/*
* Get the starting WAL location
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
pg_log_error("could not initiate base backup: %s",
PQerrorMessage(conn));
exit(1);
}
if (PQntuples(res) != 1)
{
pg_log_error("server returned unexpected response to BASE_BACKUP command; got %d rows and %d fields, expected %d rows and %d fields",
PQntuples(res), PQnfields(res), 1, 2);
exit(1);
}
strlcpy(xlogstart, PQgetvalue(res, 0, 0), sizeof(xlogstart));
if (verbose)
pg_log_info("checkpoint completed");
/*
* 9.3 and later sends the TLI of the starting point. With older servers,
* assume it's the same as the latest timeline reported by
* IDENTIFY_SYSTEM.
*/
if (PQnfields(res) >= 2)
starttli = atoi(PQgetvalue(res, 0, 1));
else
starttli = latesttli;
PQclear(res);
MemSet(xlogend, 0, sizeof(xlogend));
if (verbose && includewal != NO_WAL)
pg_log_info("write-ahead log start point: %s on timeline %u",
xlogstart, starttli);
/*
* Get the header
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
pg_log_error("could not get backup header: %s",
PQerrorMessage(conn));
exit(1);
}
if (PQntuples(res) < 1)
{
pg_log_error("no data returned from server");
exit(1);
}
/*
* Sum up the total size, for progress reporting
*/
totalsize_kb = totaldone = 0;
tablespacecount = PQntuples(res);
for (i = 0; i < PQntuples(res); i++)
{
totalsize_kb += atol(PQgetvalue(res, i, 2));
/*
* Verify tablespace directories are empty. Don't bother with the
* first once since it can be relocated, and it will be checked before
* we do anything anyway.
*/
if (format == 'p' && !PQgetisnull(res, i, 1))
{
char *path = unconstify(char *, get_tablespace_mapping(PQgetvalue(res, i, 1)));
verify_dir_is_empty_or_create(path, &made_tablespace_dirs, &found_tablespace_dirs);
}
}
/*
* When writing to stdout, require a single tablespace
*/
if (format == 't' && strcmp(basedir, "-") == 0 && PQntuples(res) > 1)
{
pg_log_error("can only write single tablespace to stdout, database has %d",
PQntuples(res));
exit(1);
}
/*
* If we're streaming WAL, start the streaming session before we start
* receiving the actual data chunks.
*/
if (includewal == STREAM_WAL)
{
if (verbose)
pg_log_info("starting background WAL receiver");
StartLogStreamer(xlogstart, starttli, sysidentifier);
}
/*
* Start receiving chunks
*/
for (i = 0; i < PQntuples(res); i++)
{
if (format == 't')
ReceiveTarFile(conn, res, i);
else
ReceiveAndUnpackTarFile(conn, res, i);
} /* Loop over all tablespaces */
if (showprogress)
{
progress_report(PQntuples(res), NULL, true);
if (isatty(fileno(stderr)))
fprintf(stderr, "\n"); /* Need to move to next line */
}
PQclear(res);
/*
* Get the stop position
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
pg_log_error("could not get write-ahead log end position from server: %s",
PQerrorMessage(conn));
exit(1);
}
if (PQntuples(res) != 1)
{
pg_log_error("no write-ahead log end position returned from server");
exit(1);
}
strlcpy(xlogend, PQgetvalue(res, 0, 0), sizeof(xlogend));
if (verbose && includewal != NO_WAL)
pg_log_info("write-ahead log end point: %s", xlogend);
PQclear(res);
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
const char *sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
if (sqlstate &&
strcmp(sqlstate, ERRCODE_DATA_CORRUPTED) == 0)
{
pg_log_error("checksum error occurred");
checksum_failure = true;
}
else
{
pg_log_error("final receive failed: %s",
PQerrorMessage(conn));
}
exit(1);
}
if (bgchild > 0)
{
#ifndef WIN32
int status;
pid_t r;
#else
DWORD status;
/*
* get a pointer sized version of bgchild to avoid warnings about
* casting to a different size on WIN64.
*/
intptr_t bgchild_handle = bgchild;
uint32 hi,
lo;
#endif
if (verbose)
pg_log_info("waiting for background process to finish streaming ...");
#ifndef WIN32
if (write(bgpipe[1], xlogend, strlen(xlogend)) != strlen(xlogend))
{
pg_log_info("could not send command to background pipe: %m");
exit(1);
}
/* Just wait for the background process to exit */
r = waitpid(bgchild, &status, 0);
if (r == (pid_t) -1)
{
pg_log_error("could not wait for child process: %m");
exit(1);
}
if (r != bgchild)
{
pg_log_error("child %d died, expected %d", (int) r, (int) bgchild);
exit(1);
}
if (status != 0)
{
pg_log_error("%s", wait_result_to_str(status));
exit(1);
}
/* Exited normally, we're happy! */
#else /* WIN32 */
/*
* On Windows, since we are in the same process, we can just store the
* value directly in the variable, and then set the flag that says
* it's there.
*/
if (sscanf(xlogend, "%X/%X", &hi, &lo) != 2)
{
pg_log_error("could not parse write-ahead log location \"%s\"",
xlogend);
exit(1);
}
xlogendptr = ((uint64) hi) << 32 | lo;
InterlockedIncrement(&has_xlogendptr);
/* First wait for the thread to exit */
if (WaitForSingleObjectEx((HANDLE) bgchild_handle, INFINITE, FALSE) !=
WAIT_OBJECT_0)
{
_dosmaperr(GetLastError());
pg_log_error("could not wait for child thread: %m");
exit(1);
}
if (GetExitCodeThread((HANDLE) bgchild_handle, &status) == 0)
{
_dosmaperr(GetLastError());
pg_log_error("could not get child thread exit status: %m");
exit(1);
}
if (status != 0)
{
pg_log_error("child thread exited with error %u",
(unsigned int) status);
exit(1);
}
/* Exited normally, we're happy */
#endif
}
/* Free the configuration file contents */
destroyPQExpBuffer(recoveryconfcontents);
/*
* End of copy data. Final result is already checked inside the loop.
*/
PQclear(res);
PQfinish(conn);
conn = NULL;
/*
* Make data persistent on disk once backup is completed. For tar format
* sync the parent directory and all its contents as each tar file was not
* synced after being completed. In plain format, all the data of the
* base directory is synced, taking into account all the tablespaces.
* Errors are not considered fatal.
*/
if (do_sync)
{
if (verbose)
pg_log_info("syncing data to disk ...");
if (format == 't')
{
if (strcmp(basedir, "-") != 0)
(void) fsync_dir_recurse(basedir);
}
else
{
(void) fsync_pgdata(basedir, serverVersion);
}
}
if (verbose)
pg_log_info("base backup completed");
}
int
main(int argc, char **argv)
{
static struct option long_options[] = {
{"help", no_argument, NULL, '?'},
{"version", no_argument, NULL, 'V'},
{"pgdata", required_argument, NULL, 'D'},
{"format", required_argument, NULL, 'F'},
{"checkpoint", required_argument, NULL, 'c'},
{"create-slot", no_argument, NULL, 'C'},
{"max-rate", required_argument, NULL, 'r'},
{"write-recovery-conf", no_argument, NULL, 'R'},
{"slot", required_argument, NULL, 'S'},
{"tablespace-mapping", required_argument, NULL, 'T'},
{"wal-method", required_argument, NULL, 'X'},
{"gzip", no_argument, NULL, 'z'},
{"compress", required_argument, NULL, 'Z'},
{"label", required_argument, NULL, 'l'},
{"no-clean", no_argument, NULL, 'n'},
{"no-sync", no_argument, NULL, 'N'},
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"port", required_argument, NULL, 'p'},
{"username", required_argument, NULL, 'U'},
{"no-password", no_argument, NULL, 'w'},
{"password", no_argument, NULL, 'W'},
{"status-interval", required_argument, NULL, 's'},
{"verbose", no_argument, NULL, 'v'},
{"progress", no_argument, NULL, 'P'},
{"waldir", required_argument, NULL, 1},
{"no-slot", no_argument, NULL, 2},
{"no-verify-checksums", no_argument, NULL, 3},
{NULL, 0, NULL, 0}
};
int c;
int option_index;
pg_logging_init(argv[0]);
progname = get_progname(argv[0]);
set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_basebackup"));
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
usage();
exit(0);
}
else if (strcmp(argv[1], "-V") == 0
|| strcmp(argv[1], "--version") == 0)
{
puts("pg_basebackup (PostgreSQL) " PG_VERSION);
exit(0);
}
}
atexit(cleanup_directories_atexit);
while ((c = getopt_long(argc, argv, "CD:F:r:RS:T:X:l:nNzZ:d:c:h:p:U:s:wWkvP",
long_options, &option_index)) != -1)
{
switch (c)
{
case 'C':
create_slot = true;
break;
case 'D':
basedir = pg_strdup(optarg);
break;
case 'F':
if (strcmp(optarg, "p") == 0 || strcmp(optarg, "plain") == 0)
format = 'p';
else if (strcmp(optarg, "t") == 0 || strcmp(optarg, "tar") == 0)
format = 't';
else
{
pg_log_error("invalid output format \"%s\", must be \"plain\" or \"tar\"",
optarg);
exit(1);
}
break;
case 'r':
maxrate = parse_max_rate(optarg);
break;
case 'R':
writerecoveryconf = true;
break;
case 'S':
/*
* When specifying replication slot name, use a permanent
* slot.
*/
replication_slot = pg_strdup(optarg);
temp_replication_slot = false;
break;
case 2:
no_slot = true;
break;
case 'T':
tablespace_list_append(optarg);
break;
case 'X':
if (strcmp(optarg, "n") == 0 ||
strcmp(optarg, "none") == 0)
{
includewal = NO_WAL;
}
else if (strcmp(optarg, "f") == 0 ||
strcmp(optarg, "fetch") == 0)
{
includewal = FETCH_WAL;
}
else if (strcmp(optarg, "s") == 0 ||
strcmp(optarg, "stream") == 0)
{
includewal = STREAM_WAL;
}
else
{
pg_log_error("invalid wal-method option \"%s\", must be \"fetch\", \"stream\", or \"none\"",
optarg);
exit(1);
}
break;
case 1:
xlog_dir = pg_strdup(optarg);
break;
case 'l':
label = pg_strdup(optarg);
break;
case 'n':
noclean = true;
break;
case 'N':
do_sync = false;
break;
case 'z':
#ifdef HAVE_LIBZ
compresslevel = Z_DEFAULT_COMPRESSION;
#else
compresslevel = 1; /* will be rejected below */
#endif
break;
case 'Z':
compresslevel = atoi(optarg);
if (compresslevel < 0 || compresslevel > 9)
{
pg_log_error("invalid compression level \"%s\"", optarg);
exit(1);
}
break;
case 'c':
if (pg_strcasecmp(optarg, "fast") == 0)
fastcheckpoint = true;
else if (pg_strcasecmp(optarg, "spread") == 0)
fastcheckpoint = false;
else
{
pg_log_error("invalid checkpoint argument \"%s\", must be \"fast\" or \"spread\"",
optarg);
exit(1);
}
break;
case 'd':
connection_string = pg_strdup(optarg);
break;
case 'h':
dbhost = pg_strdup(optarg);
break;
case 'p':
dbport = pg_strdup(optarg);
break;
case 'U':
dbuser = pg_strdup(optarg);
break;
case 'w':
dbgetpassword = -1;
break;
case 'W':
dbgetpassword = 1;
break;
case 's':
standby_message_timeout = atoi(optarg) * 1000;
if (standby_message_timeout < 0)
{
pg_log_error("invalid status interval \"%s\"", optarg);
exit(1);
}
break;
case 'v':
verbose++;
break;
case 'P':
showprogress = true;
break;
case 3:
verify_checksums = false;
break;
default:
/*
* getopt_long already emitted a complaint
*/
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
}
/*
* Any non-option arguments?
*/
if (optind < argc)
{
pg_log_error("too many command-line arguments (first is \"%s\")",
argv[optind]);
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
/*
* Required arguments
*/
if (basedir == NULL)
{
pg_log_error("no target directory specified");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
/*
* Mutually exclusive arguments
*/
if (format == 'p' && compresslevel != 0)
{
pg_log_error("only tar mode backups can be compressed");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
if (format == 't' && includewal == STREAM_WAL && strcmp(basedir, "-") == 0)
{
pg_log_error("cannot stream write-ahead logs in tar mode to stdout");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
if (replication_slot && includewal != STREAM_WAL)
{
pg_log_error("replication slots can only be used with WAL streaming");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
if (no_slot)
{
if (replication_slot)
{
pg_log_error("--no-slot cannot be used with slot name");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
temp_replication_slot = false;
}
if (create_slot)
{
if (!replication_slot)
{
pg_log_error("%s needs a slot to be specified using --slot",
"--create-slot");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
if (no_slot)
{
pg_log_error("--create-slot and --no-slot are incompatible options");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
}
if (xlog_dir)
{
if (format != 'p')
{
pg_log_error("WAL directory location can only be specified in plain mode");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
/* clean up xlog directory name, check it's absolute */
canonicalize_path(xlog_dir);
if (!is_absolute_path(xlog_dir))
{
pg_log_error("WAL directory location must be an absolute path");
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
progname);
exit(1);
}
}
#ifndef HAVE_LIBZ
if (compresslevel != 0)
{
pg_log_error("this build does not support compression");
exit(1);
}
#endif
/* connection in replication mode to server */
conn = GetConnection();
if (!conn)
{
/* Error message already written in GetConnection() */
exit(1);
}
atexit(disconnect_atexit);
/*
* Set umask so that directories/files are created with the same
* permissions as directories/files in the source data directory.
*
* pg_mode_mask is set to owner-only by default and then updated in
* GetConnection() where we get the mode from the server-side with
* RetrieveDataDirCreatePerm() and then call SetDataDirectoryCreatePerm().
*/
umask(pg_mode_mask);
/*
* Verify that the target directory exists, or create it. For plaintext
* backups, always require the directory. For tar backups, require it
* unless we are writing to stdout.
*/
if (format == 'p' || strcmp(basedir, "-") != 0)
verify_dir_is_empty_or_create(basedir, &made_new_pgdata, &found_existing_pgdata);
/* determine remote server's xlog segment size */
if (!RetrieveWalSegSize(conn))
exit(1);
/* Create pg_wal symlink, if required */
if (xlog_dir)
{
char *linkloc;
verify_dir_is_empty_or_create(xlog_dir, &made_new_xlogdir, &found_existing_xlogdir);
/*
* Form name of the place where the symlink must go. pg_xlog has been
* renamed to pg_wal in post-10 clusters.
*/
linkloc = psprintf("%s/%s", basedir,
PQserverVersion(conn) < MINIMUM_VERSION_FOR_PG_WAL ?
"pg_xlog" : "pg_wal");
#ifdef HAVE_SYMLINK
if (symlink(xlog_dir, linkloc) != 0)
{
pg_log_error("could not create symbolic link \"%s\": %m", linkloc);
exit(1);
}
#else
pg_log_error("symlinks are not supported on this platform");
exit(1);
#endif
free(linkloc);
}
BaseBackup();
success = true;
return 0;
}
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