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PostgreSQL/src/bin/pg_basebackup/pg_basebackup.c
Thomas Munro 7e50b4e3c5 Remove configure probe for sys/select.h. 
<sys/select.h> is in SUSv3 and every targeted Unix system has it.
Provide an empty header in src/include/port/win32 so that we can
include it unguarded even on Windows.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2BL_3brvh%3D8e0BW_VfX9h7MtwgN%3DnFHP5o7X2oZucY9dg%40mail.gmail.com
2022-08-14 00:09:47 +12:00

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/*-------------------------------------------------------------------------
*
* pg_basebackup.c - receive a base backup using streaming replication protocol
*
* Author: Magnus Hagander <magnus@hagander.net>
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/bin/pg_basebackup/pg_basebackup.c
*-------------------------------------------------------------------------
*/
#include "postgres_fe.h"
#include <unistd.h>
#include <dirent.h>
#include <limits.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#ifdef HAVE_LIBZ
#include <zlib.h>
#endif
#include "access/xlog_internal.h"
#include "backup/basebackup.h"
#include "bbstreamer.h"
#include "common/compression.h"
#include "common/file_perm.h"
#include "common/file_utils.h"
#include "common/logging.h"
#include "fe_utils/option_utils.h"
#include "fe_utils/recovery_gen.h"
#include "getopt_long.h"
#include "receivelog.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;
typedef struct ArchiveStreamState
{
int tablespacenum;
pg_compress_specification *compress;
bbstreamer *streamer;
bbstreamer *manifest_inject_streamer;
PQExpBuffer manifest_buffer;
char manifest_filename[MAXPGPATH];
FILE *manifest_file;
} ArchiveStreamState;
typedef struct WriteTarState
{
int tablespacenum;
bbstreamer *streamer;
} WriteTarState;
typedef struct WriteManifestState
{
char filename[MAXPGPATH];
FILE *file;
} WriteManifestState;
typedef void (*WriteDataCallback) (size_t nbytes, char *buf,
void *callback_data);
/*
* 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
/*
* Backup manifests are supported from version 13.
*/
#define MINIMUM_VERSION_FOR_MANIFESTS 130000
/*
* Before v15, tar files received from the server will be improperly
* terminated.
*/
#define MINIMUM_VERSION_FOR_TERMINATED_TARFILE 150000
/*
* Different ways to include WAL
*/
typedef enum
{
NO_WAL,
FETCH_WAL,
STREAM_WAL
} IncludeWal;
/*
* Different places to perform compression
*/
typedef enum
{
COMPRESS_LOCATION_UNSPECIFIED,
COMPRESS_LOCATION_CLIENT,
COMPRESS_LOCATION_SERVER
} CompressionLocation;
/* Global options */
static char *basedir = NULL;
static TablespaceList tablespace_dirs = {NULL, NULL};
static char *xlog_dir = NULL;
static char format = '\0'; /* 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 bool estimatesize = true;
static int verbose = 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 char *backup_target = NULL;
static bool create_slot = false;
static bool no_slot = false;
static bool verify_checksums = true;
static bool manifest = true;
static bool manifest_force_encode = false;
static char *manifest_checksums = NULL;
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 indicators */
static uint64 totalsize_kb;
static uint64 totaldone;
static int tablespacecount;
static char *progress_filename = NULL;
/* 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;
/* Flag to indicate if child process exited unexpectedly */
static volatile sig_atomic_t bgchild_exited = 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_update_filename(const char *filename);
static void progress_report(int tablespacenum, bool force, bool finished);
static bbstreamer *CreateBackupStreamer(char *archive_name, char *spclocation,
bbstreamer **manifest_inject_streamer_p,
bool is_recovery_guc_supported,
bool expect_unterminated_tarfile,
pg_compress_specification *compress);
static void ReceiveArchiveStreamChunk(size_t r, char *copybuf,
void *callback_data);
static char GetCopyDataByte(size_t r, char *copybuf, size_t *cursor);
static char *GetCopyDataString(size_t r, char *copybuf, size_t *cursor);
static uint64 GetCopyDataUInt64(size_t r, char *copybuf, size_t *cursor);
static void GetCopyDataEnd(size_t r, char *copybuf, size_t cursor);
static void ReportCopyDataParseError(size_t r, char *copybuf);
static void ReceiveTarFile(PGconn *conn, char *archive_name, char *spclocation,
bool tablespacenum, pg_compress_specification *compress);
static void ReceiveTarCopyChunk(size_t r, char *copybuf, void *callback_data);
static void ReceiveBackupManifest(PGconn *conn);
static void ReceiveBackupManifestChunk(size_t r, char *copybuf,
void *callback_data);
static void ReceiveBackupManifestInMemory(PGconn *conn, PQExpBuffer buf);
static void ReceiveBackupManifestInMemoryChunk(size_t r, char *copybuf,
void *callback_data);
static void BaseBackup(char *compression_algorithm, char *compression_detail,
CompressionLocation compressloc,
pg_compress_specification *client_compress);
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
/*
* If the bgchild exits prematurely and raises a SIGCHLD signal, we can abort
* processing rather than wait until the backup has finished and error out at
* that time. On Windows, we use a background thread which can communicate
* without the need for a signal handler.
*/
static void
sigchld_handler(SIGNAL_ARGS)
{
bgchild_exited = true;
}
/*
* 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 && !bgchild_exited)
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_fatal("directory name too long");
if (*arg_ptr == '\\' && *(arg_ptr + 1) == '=')
; /* skip backslash escaping = */
else if (*arg_ptr == '=' && (arg_ptr == arg || *(arg_ptr - 1) != '\\'))
{
if (*cell->new_dir)
pg_fatal("multiple \"=\" signs in tablespace mapping");
else
dst = dst_ptr = cell->new_dir;
}
else
*dst_ptr++ = *arg_ptr;
}
if (!*cell->old_dir || !*cell->new_dir)
pg_fatal("invalid tablespace mapping format \"%s\", must be \"OLDDIR=NEWDIR\"", arg);
/*
* 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_fatal("old directory is not an absolute path in tablespace mapping: %s",
cell->old_dir);
if (!is_absolute_path(cell->new_dir))
pg_fatal("new directory is not an absolute path in tablespace mapping: %s",
cell->new_dir);
/*
* 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;
}
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, --target=TARGET[:DETAIL]\n"
" backup target (if other than client)\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=[{client|server}-]METHOD[:DETAIL]\n"
" compress on client or server as specified\n"));
printf(_(" -Z, --compress=none do not compress tar output\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(_(" --manifest-checksums=SHA{224,256,384,512}|CRC32C|NONE\n"
" use algorithm for manifest checksums\n"));
printf(_(" --manifest-force-encode\n"
" hex encode all file names in manifest\n"));
printf(_(" --no-estimate-size do not estimate backup size in server side\n"));
printf(_(" --no-manifest suppress generation of backup manifest\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 <%s>.\n"), PACKAGE_BUGREPORT);
printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}
/*
* 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 = {0};
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);
r = select(bgpipe[0] + 1, &fds, NULL, NULL, &tv);
if (r == 1)
{
char xlogend[64] = {0};
uint32 hi,
lo;
r = read(bgpipe[0], xlogend, sizeof(xlogend) - 1);
if (r < 0)
pg_fatal("could not read from ready pipe: %m");
if (sscanf(xlogend, "%X/%X", &hi, &lo) != 2)
pg_fatal("could not parse write-ahead log location \"%s\"",
xlogend);
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;
pg_compress_algorithm wal_compress_algorithm;
int wal_compress_level;
} logstreamer_param;
static int
LogStreamerMain(logstreamer_param *param)
{
StreamCtl stream = {0};
in_log_streamer = true;
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,
PG_COMPRESSION_NONE, 0,
stream.do_sync);
else
stream.walmethod = CreateWalTarMethod(param->xlog,
param->wal_compress_algorithm,
param->wal_compress_level,
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.
*/
#ifdef WIN32
/*
* In order to signal the main thread of an ungraceful exit we set the
* same flag that we use on Unix to signal SIGCHLD.
*/
bgchild_exited = true;
#endif
return 1;
}
if (!stream.walmethod->finish())
{
pg_log_error("could not finish writing WAL files: %m");
#ifdef WIN32
bgchild_exited = true;
#endif
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,
pg_compress_algorithm wal_compress_algorithm,
int wal_compress_level)
{
logstreamer_param *param;
uint32 hi,
lo;
char statusdir[MAXPGPATH];
param = pg_malloc0(sizeof(logstreamer_param));
param->timeline = timeline;
param->sysidentifier = sysidentifier;
param->wal_compress_algorithm = wal_compress_algorithm;
param->wal_compress_level = wal_compress_level;
/* Convert the starting position */
if (sscanf(startpos, "%X/%X", &hi, &lo) != 2)
pg_fatal("could not parse write-ahead log location \"%s\"",
startpos);
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_fatal("could not create pipe for background process: %m");
#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, 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_fatal("could not create directory \"%s\": %m", statusdir);
}
/*
* 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_fatal("could not create background process: %m");
/*
* 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_fatal("could not create background thread: %m");
#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_fatal("could not create directory \"%s\": %m", dirname);
if (created)
*created = true;
return;
case 1:
/*
* Exists, empty
*/
if (found)
*found = true;
return;
case 2:
case 3:
case 4:
/*
* Exists, not empty
*/
pg_fatal("directory \"%s\" exists but is not empty", dirname);
case -1:
/*
* Access problem
*/
pg_fatal("could not access directory \"%s\": %m", dirname);
}
}
/*
* Callback to update our notion of the current filename.
*
* No other code should modify progress_filename!
*/
static void
progress_update_filename(const char *filename)
{
/* We needn't maintain this variable if not doing verbose reports. */
if (showprogress && verbose)
{
free(progress_filename);
if (filename)
progress_filename = pg_strdup(filename);
else
progress_filename = NULL;
}
}
/*
* 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.
*
* If finished is set to true, this is the last progress report. The cursor
* is moved to the next line.
*/
static void
progress_report(int tablespacenum, bool force, bool finished)
{
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 && !finished)
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;
snprintf(totaldone_str, sizeof(totaldone_str), UINT64_FORMAT,
totaldone / 1024);
snprintf(totalsize_str, sizeof(totalsize_str), UINT64_FORMAT, totalsize_kb);
#define VERBOSE_FILENAME_LENGTH 35
if (verbose)
{
if (!progress_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(progress_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 ? progress_filename + strlen(progress_filename) - VERBOSE_FILENAME_LENGTH + 3 : progress_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);
/*
* Stay on the same line if reporting to a terminal and we're not done
* yet.
*/
fputc((!finished && isatty(fileno(stderr))) ? '\r' : '\n', stderr);
}
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_fatal("transfer rate \"%s\" is not a valid value", src);
if (errno != 0)
pg_fatal("invalid transfer rate \"%s\": %m", src);
if (result <= 0)
{
/*
* Reject obviously wrong values here.
*/
pg_fatal("transfer rate must be greater than zero");
}
/*
* 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_fatal("invalid --max-rate unit: \"%s\"", suffix);
/* Valid integer? */
if ((uint64) result != (uint64) ((uint32) result))
pg_fatal("transfer rate \"%s\" exceeds integer range", src);
/*
* 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_fatal("transfer rate \"%s\" is out of range", src);
return (int32) result;
}
/*
* Basic parsing of a value specified for -Z/--compress.
*
* We're not concerned here with understanding exactly what behavior the
* user wants, but we do need to know whether the user is requesting client
* or server side compression or leaving it unspecified, and we need to
* separate the name of the compression algorithm from the detail string.
*
* For instance, if the user writes --compress client-lz4:6, we want to
* separate that into (a) client-side compression, (b) algorithm "lz4",
* and (c) detail "6". Note, however, that all the client/server prefix is
* optional, and so is the detail. The algorithm name is required, unless
* the whole string is an integer, in which case we assume "gzip" as the
* algorithm and use the integer as the detail.
*
* We're not concerned with validation at this stage, so if the user writes
* --compress client-turkey:sandwich, the requested algorithm is "turkey"
* and the detail string is "sandwich". We'll sort out whether that's legal
* at a later stage.
*/
static void
parse_compress_options(char *option, char **algorithm, char **detail,
CompressionLocation *locationres)
{
char *sep;
char *endp;
/*
* Check whether the compression specification consists of a bare integer.
*
* If so, for backward compatibility, assume gzip.
*/
(void) strtol(option, &endp, 10);
if (*endp == '\0')
{
*locationres = COMPRESS_LOCATION_UNSPECIFIED;
*algorithm = pstrdup("gzip");
*detail = pstrdup(option);
return;
}
/* Strip off any "client-" or "server-" prefix. */
if (strncmp(option, "server-", 7) == 0)
{
*locationres = COMPRESS_LOCATION_SERVER;
option += 7;
}
else if (strncmp(option, "client-", 7) == 0)
{
*locationres = COMPRESS_LOCATION_CLIENT;
option += 7;
}
else
*locationres = COMPRESS_LOCATION_UNSPECIFIED;
/*
* Check whether there is a compression detail following the algorithm
* name.
*/
sep = strchr(option, ':');
if (sep == NULL)
{
*algorithm = pstrdup(option);
*detail = NULL;
}
else
{
char *alg;
alg = palloc((sep - option) + 1);
memcpy(alg, option, sep - option);
alg[sep - option] = '\0';
*algorithm = alg;
*detail = pstrdup(sep + 1);
}
}
/*
* Read a stream of COPY data and invoke the provided callback for each
* chunk.
*/
static void
ReceiveCopyData(PGconn *conn, WriteDataCallback callback,
void *callback_data)
{
PGresult *res;
/* Get the COPY data stream. */
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_COPY_OUT)
pg_fatal("could not get COPY data stream: %s",
PQerrorMessage(conn));
PQclear(res);
/* Loop over chunks until done. */
while (1)
{
int r;
char *copybuf;
r = PQgetCopyData(conn, &copybuf, 0);
if (r == -1)
{
/* End of chunk. */
break;
}
else if (r == -2)
pg_fatal("could not read COPY data: %s",
PQerrorMessage(conn));
if (bgchild_exited)
pg_fatal("background process terminated unexpectedly");
(*callback) (r, copybuf, callback_data);
PQfreemem(copybuf);
}
}
/*
* Figure out what to do with an archive received from the server based on
* the options selected by the user. We may just write the results directly
* to a file, or we might compress first, or we might extract the tar file
* and write each member separately. This function doesn't do any of that
* directly, but it works out what kind of bbstreamer we need to create so
* that the right stuff happens when, down the road, we actually receive
* the data.
*/
static bbstreamer *
CreateBackupStreamer(char *archive_name, char *spclocation,
bbstreamer **manifest_inject_streamer_p,
bool is_recovery_guc_supported,
bool expect_unterminated_tarfile,
pg_compress_specification *compress)
{
bbstreamer *streamer = NULL;
bbstreamer *manifest_inject_streamer = NULL;
bool inject_manifest;
bool is_tar,
is_tar_gz,
is_tar_lz4,
is_tar_zstd,
is_compressed_tar;
bool must_parse_archive;
int archive_name_len = strlen(archive_name);
/*
* Normally, we emit the backup manifest as a separate file, but when
* we're writing a tarfile to stdout, we don't have that option, so
* include it in the one tarfile we've got.
*/
inject_manifest = (format == 't' && strcmp(basedir, "-") == 0 && manifest);
/* Is this a tar archive? */
is_tar = (archive_name_len > 4 &&
strcmp(archive_name + archive_name_len - 4, ".tar") == 0);
/* Is this a .tar.gz archive? */
is_tar_gz = (archive_name_len > 7 &&
strcmp(archive_name + archive_name_len - 7, ".tar.gz") == 0);
/* Is this a .tar.lz4 archive? */
is_tar_lz4 = (archive_name_len > 8 &&
strcmp(archive_name + archive_name_len - 8, ".tar.lz4") == 0);
/* Is this a .tar.zst archive? */
is_tar_zstd = (archive_name_len > 8 &&
strcmp(archive_name + archive_name_len - 8, ".tar.zst") == 0);
/* Is this any kind of compressed tar? */
is_compressed_tar = is_tar_gz || is_tar_lz4 || is_tar_zstd;
/*
* Injecting the manifest into a compressed tar file would be possible if
* we decompressed it, parsed the tarfile, generated a new tarfile, and
* recompressed it, but compressing and decompressing multiple times just
* to inject the manifest seems inefficient enough that it's probably not
* what the user wants. So, instead, reject the request and tell the user
* to specify something more reasonable.
*/
if (inject_manifest && is_compressed_tar)
{
pg_log_error("cannot inject manifest into a compressed tarfile");
pg_log_info("use client-side compression, send the output to a directory rather than standard output, or use --no-manifest");
exit(1);
}
/*
* We have to parse the archive if (1) we're suppose to extract it, or if
* (2) we need to inject backup_manifest or recovery configuration into
* it. However, we only know how to parse tar archives.
*/
must_parse_archive = (format == 'p' || inject_manifest ||
(spclocation == NULL && writerecoveryconf));
/* At present, we only know how to parse tar archives. */
if (must_parse_archive && !is_tar && !is_compressed_tar)
{
pg_log_error("unable to parse archive: %s", archive_name);
pg_log_error_detail("Only tar archives can be parsed.");
if (format == 'p')
pg_log_error_detail("Plain format requires pg_basebackup to parse the archive.");
if (inject_manifest)
pg_log_error_detail("Using - as the output directory requires pg_basebackup to parse the archive.");
if (writerecoveryconf)
pg_log_error_detail("The -R option requires pg_basebackup to parse the archive.");
exit(1);
}
if (format == 'p')
{
const char *directory;
/*
* In plain format, we must extract the archive. The data for the main
* tablespace will be written to the base directory, and the data for
* other tablespaces will be written to the directory where they're
* located on the server, after applying any user-specified tablespace
* mappings.
*/
directory = spclocation == NULL ? basedir
: get_tablespace_mapping(spclocation);
streamer = bbstreamer_extractor_new(directory,
get_tablespace_mapping,
progress_update_filename);
}
else
{
FILE *archive_file;
char archive_filename[MAXPGPATH];
/*
* In tar format, we just write the archive without extracting it.
* Normally, we write it to the archive name provided by the caller,
* but when the base directory is "-" that means we need to write to
* standard output.
*/
if (strcmp(basedir, "-") == 0)
{
snprintf(archive_filename, sizeof(archive_filename), "-");
archive_file = stdout;
}
else
{
snprintf(archive_filename, sizeof(archive_filename),
"%s/%s", basedir, archive_name);
archive_file = NULL;
}
if (compress->algorithm == PG_COMPRESSION_NONE)
streamer = bbstreamer_plain_writer_new(archive_filename,
archive_file);
else if (compress->algorithm == PG_COMPRESSION_GZIP)
{
strlcat(archive_filename, ".gz", sizeof(archive_filename));
streamer = bbstreamer_gzip_writer_new(archive_filename,
archive_file, compress);
}
else if (compress->algorithm == PG_COMPRESSION_LZ4)
{
strlcat(archive_filename, ".lz4", sizeof(archive_filename));
streamer = bbstreamer_plain_writer_new(archive_filename,
archive_file);
streamer = bbstreamer_lz4_compressor_new(streamer, compress);
}
else if (compress->algorithm == PG_COMPRESSION_ZSTD)
{
strlcat(archive_filename, ".zst", sizeof(archive_filename));
streamer = bbstreamer_plain_writer_new(archive_filename,
archive_file);
streamer = bbstreamer_zstd_compressor_new(streamer, compress);
}
else
{
Assert(false); /* not reachable */
}
/*
* If we need to parse the archive for whatever reason, then we'll
* also need to re-archive, because, if the output format is tar, the
* only point of parsing the archive is to be able to inject stuff
* into it.
*/
if (must_parse_archive)
streamer = bbstreamer_tar_archiver_new(streamer);
progress_update_filename(archive_filename);
}
/*
* If we're supposed to inject the backup manifest into the results, it
* should be done here, so that the file content can be injected directly,
* without worrying about the details of the tar format.
*/
if (inject_manifest)
manifest_inject_streamer = streamer;
/*
* If this is the main tablespace and we're supposed to write recovery
* information, arrange to do that.
*/
if (spclocation == NULL && writerecoveryconf)
{
Assert(must_parse_archive);
streamer = bbstreamer_recovery_injector_new(streamer,
is_recovery_guc_supported,
recoveryconfcontents);
}
/*
* If we're doing anything that involves understanding the contents of the
* archive, we'll need to parse it. If not, we can skip parsing it, but
* old versions of the server send improperly terminated tarfiles, so if
* we're talking to such a server we'll need to add the terminator here.
*/
if (must_parse_archive)
streamer = bbstreamer_tar_parser_new(streamer);
else if (expect_unterminated_tarfile)
streamer = bbstreamer_tar_terminator_new(streamer);
/*
* If the user has requested a server compressed archive along with
* archive extraction at client then we need to decompress it.
*/
if (format == 'p')
{
if (is_tar_gz)
streamer = bbstreamer_gzip_decompressor_new(streamer);
else if (is_tar_lz4)
streamer = bbstreamer_lz4_decompressor_new(streamer);
else if (is_tar_zstd)
streamer = bbstreamer_zstd_decompressor_new(streamer);
}
/* Return the results. */
*manifest_inject_streamer_p = manifest_inject_streamer;
return streamer;
}
/*
* Receive all of the archives the server wants to send - and the backup
* manifest if present - as a single COPY stream.
*/
static void
ReceiveArchiveStream(PGconn *conn, pg_compress_specification *compress)
{
ArchiveStreamState state;
/* Set up initial state. */
memset(&state, 0, sizeof(state));
state.tablespacenum = -1;
state.compress = compress;
/* All the real work happens in ReceiveArchiveStreamChunk. */
ReceiveCopyData(conn, ReceiveArchiveStreamChunk, &state);
/* If we wrote the backup manifest to a file, close the file. */
if (state.manifest_file !=NULL)
{
fclose(state.manifest_file);
state.manifest_file = NULL;
}
/*
* If we buffered the backup manifest in order to inject it into the
* output tarfile, do that now.
*/
if (state.manifest_inject_streamer != NULL &&
state.manifest_buffer != NULL)
{
bbstreamer_inject_file(state.manifest_inject_streamer,
"backup_manifest",
state.manifest_buffer->data,
state.manifest_buffer->len);
destroyPQExpBuffer(state.manifest_buffer);
state.manifest_buffer = NULL;
}
/* If there's still an archive in progress, end processing. */
if (state.streamer != NULL)
{
bbstreamer_finalize(state.streamer);
bbstreamer_free(state.streamer);
state.streamer = NULL;
}
}
/*
* Receive one chunk of data sent by the server as part of a single COPY
* stream that includes all archives and the manifest.
*/
static void
ReceiveArchiveStreamChunk(size_t r, char *copybuf, void *callback_data)
{
ArchiveStreamState *state = callback_data;
size_t cursor = 0;
/* Each CopyData message begins with a type byte. */
switch (GetCopyDataByte(r, copybuf, &cursor))
{
case 'n':
{
/* New archive. */
char *archive_name;
char *spclocation;
/*
* We force a progress report at the end of each tablespace. A
* new tablespace starts when the previous one ends, except in
* the case of the very first one.
*/
if (++state->tablespacenum > 0)
progress_report(state->tablespacenum, true, false);
/* Sanity check. */
if (state->manifest_buffer != NULL ||
state->manifest_file !=NULL)
pg_fatal("archives should precede manifest");
/* Parse the rest of the CopyData message. */
archive_name = GetCopyDataString(r, copybuf, &cursor);
spclocation = GetCopyDataString(r, copybuf, &cursor);
GetCopyDataEnd(r, copybuf, cursor);
/*
* Basic sanity checks on the archive name: it shouldn't be
* empty, it shouldn't start with a dot, and it shouldn't
* contain a path separator.
*/
if (archive_name[0] == '\0' || archive_name[0] == '.' ||
strchr(archive_name, '/') != NULL ||
strchr(archive_name, '\\') != NULL)
pg_fatal("invalid archive name: \"%s\"",
archive_name);
/*
* An empty spclocation is treated as NULL. We expect this
* case to occur for the data directory itself, but not for
* any archives that correspond to tablespaces.
*/
if (spclocation[0] == '\0')
spclocation = NULL;
/* End processing of any prior archive. */
if (state->streamer != NULL)
{
bbstreamer_finalize(state->streamer);
bbstreamer_free(state->streamer);
state->streamer = NULL;
}
/*
* Create an appropriate backup streamer, unless a backup
* target was specified. In that case, it's up to the server
* to put the backup wherever it needs to go.
*/
if (backup_target == NULL)
{
/*
* We know that recovery GUCs are supported, because this
* protocol can only be used on v15+.
*/
state->streamer =
CreateBackupStreamer(archive_name,
spclocation,
&state->manifest_inject_streamer,
true, false,
state->compress);
}
break;
}
case 'd':
{
/* Archive or manifest data. */
if (state->manifest_buffer != NULL)
{
/* Manifest data, buffer in memory. */
appendPQExpBuffer(state->manifest_buffer, copybuf + 1,
r - 1);
}
else if (state->manifest_file !=NULL)
{
/* Manifest data, write to disk. */
if (fwrite(copybuf + 1, r - 1, 1,
state->manifest_file) != 1)
{
/*
* If fwrite() didn't set errno, assume that the
* problem is that we're out of disk space.
*/
if (errno == 0)
errno = ENOSPC;
pg_fatal("could not write to file \"%s\": %m",
state->manifest_filename);
}
}
else if (state->streamer != NULL)
{
/* Archive data. */
bbstreamer_content(state->streamer, NULL, copybuf + 1,
r - 1, BBSTREAMER_UNKNOWN);
}
else
pg_fatal("unexpected payload data");
break;
}
case 'p':
{
/*
* Progress report.
*
* The remainder of the message is expected to be an 8-byte
* count of bytes completed.
*/
totaldone = GetCopyDataUInt64(r, copybuf, &cursor);
GetCopyDataEnd(r, copybuf, cursor);
/*
* The server shouldn't send progress report messages too
* often, so we force an update each time we receive one.
*/
progress_report(state->tablespacenum, true, false);
break;
}
case 'm':
{
/*
* Manifest data will be sent next. This message is not
* expected to have any further payload data.
*/
GetCopyDataEnd(r, copybuf, cursor);
/*
* If a backup target was specified, figuring out where to put
* the manifest is the server's problem. Otherwise, we need to
* deal with it.
*/
if (backup_target == NULL)
{
/*
* If we're supposed inject the manifest into the archive,
* we prepare to buffer it in memory; otherwise, we
* prepare to write it to a temporary file.
*/
if (state->manifest_inject_streamer != NULL)
state->manifest_buffer = createPQExpBuffer();
else
{
snprintf(state->manifest_filename,
sizeof(state->manifest_filename),
"%s/backup_manifest.tmp", basedir);
state->manifest_file =
fopen(state->manifest_filename, "wb");
if (state->manifest_file == NULL)
pg_fatal("could not create file \"%s\": %m",
state->manifest_filename);
}
}
break;
}
default:
ReportCopyDataParseError(r, copybuf);
break;
}
}
/*
* Get a single byte from a CopyData message.
*
* Bail out if none remain.
*/
static char
GetCopyDataByte(size_t r, char *copybuf, size_t *cursor)
{
if (*cursor >= r)
ReportCopyDataParseError(r, copybuf);
return copybuf[(*cursor)++];
}
/*
* Get a NUL-terminated string from a CopyData message.
*
* Bail out if the terminating NUL cannot be found.
*/
static char *
GetCopyDataString(size_t r, char *copybuf, size_t *cursor)
{
size_t startpos = *cursor;
size_t endpos = startpos;
while (1)
{
if (endpos >= r)
ReportCopyDataParseError(r, copybuf);
if (copybuf[endpos] == '\0')
break;
++endpos;
}
*cursor = endpos + 1;
return &copybuf[startpos];
}
/*
* Get an unsigned 64-bit integer from a CopyData message.
*
* Bail out if there are not at least 8 bytes remaining.
*/
static uint64
GetCopyDataUInt64(size_t r, char *copybuf, size_t *cursor)
{
uint64 result;
if (*cursor + sizeof(uint64) > r)
ReportCopyDataParseError(r, copybuf);
memcpy(&result, &copybuf[*cursor], sizeof(uint64));
*cursor += sizeof(uint64);
return pg_ntoh64(result);
}
/*
* Bail out if we didn't parse the whole message.
*/
static void
GetCopyDataEnd(size_t r, char *copybuf, size_t cursor)
{
if (r != cursor)
ReportCopyDataParseError(r, copybuf);
}
/*
* Report failure to parse a CopyData message from the server. Then exit.
*
* As a debugging aid, we try to give some hint about what kind of message
* provoked the failure. Perhaps this is not detailed enough, but it's not
* clear that it's worth expending any more code on what should be a
* can't-happen case.
*/
static void
ReportCopyDataParseError(size_t r, char *copybuf)
{
if (r == 0)
pg_fatal("empty COPY message");
else
pg_fatal("malformed COPY message of type %d, length %zu",
copybuf[0], r);
}
/*
* Receive raw tar data from the server, and stream it to the appropriate
* location. If we're writing a single tarfile to standard output, also
* receive the backup manifest and inject it into that tarfile.
*/
static void
ReceiveTarFile(PGconn *conn, char *archive_name, char *spclocation,
bool tablespacenum, pg_compress_specification *compress)
{
WriteTarState state;
bbstreamer *manifest_inject_streamer;
bool is_recovery_guc_supported;
bool expect_unterminated_tarfile;
/* Pass all COPY data through to the backup streamer. */
memset(&state, 0, sizeof(state));
is_recovery_guc_supported =
PQserverVersion(conn) >= MINIMUM_VERSION_FOR_RECOVERY_GUC;
expect_unterminated_tarfile =
PQserverVersion(conn) < MINIMUM_VERSION_FOR_TERMINATED_TARFILE;
state.streamer = CreateBackupStreamer(archive_name, spclocation,
&manifest_inject_streamer,
is_recovery_guc_supported,
expect_unterminated_tarfile,
compress);
state.tablespacenum = tablespacenum;
ReceiveCopyData(conn, ReceiveTarCopyChunk, &state);
progress_update_filename(NULL);
/*
* The decision as to whether we need to inject the backup manifest into
* the output at this stage is made by CreateBackupStreamer; if that is
* needed, manifest_inject_streamer will be non-NULL; otherwise, it will
* be NULL.
*/
if (manifest_inject_streamer != NULL)
{
PQExpBufferData buf;
/* Slurp the entire backup manifest into a buffer. */
initPQExpBuffer(&buf);
ReceiveBackupManifestInMemory(conn, &buf);
if (PQExpBufferDataBroken(buf))
pg_fatal("out of memory");
/* Inject it into the output tarfile. */
bbstreamer_inject_file(manifest_inject_streamer, "backup_manifest",
buf.data, buf.len);
/* Free memory. */
termPQExpBuffer(&buf);
}
/* Cleanup. */
bbstreamer_finalize(state.streamer);
bbstreamer_free(state.streamer);
progress_report(tablespacenum, true, false);
/*
* Do not sync the resulting tar file yet, all files are synced once at
* the end.
*/
}
/*
* Receive one chunk of tar-format data from the server.
*/
static void
ReceiveTarCopyChunk(size_t r, char *copybuf, void *callback_data)
{
WriteTarState *state = callback_data;
bbstreamer_content(state->streamer, NULL, copybuf, r, BBSTREAMER_UNKNOWN);
totaldone += r;
progress_report(state->tablespacenum, false, false);
}
/*
* 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 the backup manifest file and write it out to a file.
*/
static void
ReceiveBackupManifest(PGconn *conn)
{
WriteManifestState state;
snprintf(state.filename, sizeof(state.filename),
"%s/backup_manifest.tmp", basedir);
state.file = fopen(state.filename, "wb");
if (state.file == NULL)
pg_fatal("could not create file \"%s\": %m", state.filename);
ReceiveCopyData(conn, ReceiveBackupManifestChunk, &state);
fclose(state.file);
}
/*
* Receive one chunk of the backup manifest file and write it out to a file.
*/
static void
ReceiveBackupManifestChunk(size_t r, char *copybuf, void *callback_data)
{
WriteManifestState *state = callback_data;
errno = 0;
if (fwrite(copybuf, r, 1, state->file) != 1)
{
/* if write didn't set errno, assume problem is no disk space */
if (errno == 0)
errno = ENOSPC;
pg_fatal("could not write to file \"%s\": %m", state->filename);
}
}
/*
* Receive the backup manifest file and write it out to a file.
*/
static void
ReceiveBackupManifestInMemory(PGconn *conn, PQExpBuffer buf)
{
ReceiveCopyData(conn, ReceiveBackupManifestInMemoryChunk, buf);
}
/*
* Receive one chunk of the backup manifest file and write it out to a file.
*/
static void
ReceiveBackupManifestInMemoryChunk(size_t r, char *copybuf,
void *callback_data)
{
PQExpBuffer buf = callback_data;
appendPQExpBuffer(buf, copybuf, r);
}
static void
BaseBackup(char *compression_algorithm, char *compression_detail,
CompressionLocation compressloc, pg_compress_specification *client_compress)
{
PGresult *res;
char *sysidentifier;
TimeLineID latesttli;
TimeLineID starttli;
char *basebkp;
int i;
char xlogstart[64];
char xlogend[64] = {0};
int minServerMajor,
maxServerMajor;
int serverVersion,
serverMajor;
int writing_to_stdout;
bool use_new_option_syntax = false;
PQExpBufferData buf;
Assert(conn != NULL);
initPQExpBuffer(&buf);
/*
* 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_fatal("incompatible server version %s",
serverver ? serverver : "'unknown'");
}
if (serverMajor >= 1500)
use_new_option_syntax = true;
/*
* 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
*/
AppendStringCommandOption(&buf, use_new_option_syntax, "LABEL", label);
if (estimatesize)
AppendPlainCommandOption(&buf, use_new_option_syntax, "PROGRESS");
if (includewal == FETCH_WAL)
AppendPlainCommandOption(&buf, use_new_option_syntax, "WAL");
if (fastcheckpoint)
{
if (use_new_option_syntax)
AppendStringCommandOption(&buf, use_new_option_syntax,
"CHECKPOINT", "fast");
else
AppendPlainCommandOption(&buf, use_new_option_syntax, "FAST");
}
if (includewal != NO_WAL)
{
if (use_new_option_syntax)
AppendIntegerCommandOption(&buf, use_new_option_syntax, "WAIT", 0);
else
AppendPlainCommandOption(&buf, use_new_option_syntax, "NOWAIT");
}
if (maxrate > 0)
AppendIntegerCommandOption(&buf, use_new_option_syntax, "MAX_RATE",
maxrate);
if (format == 't')
AppendPlainCommandOption(&buf, use_new_option_syntax, "TABLESPACE_MAP");
if (!verify_checksums)
{
if (use_new_option_syntax)
AppendIntegerCommandOption(&buf, use_new_option_syntax,
"VERIFY_CHECKSUMS", 0);
else
AppendPlainCommandOption(&buf, use_new_option_syntax,
"NOVERIFY_CHECKSUMS");
}
if (manifest)
{
AppendStringCommandOption(&buf, use_new_option_syntax, "MANIFEST",
manifest_force_encode ? "force-encode" : "yes");
if (manifest_checksums != NULL)
AppendStringCommandOption(&buf, use_new_option_syntax,
"MANIFEST_CHECKSUMS", manifest_checksums);
}
if (backup_target != NULL)
{
char *colon;
if (serverMajor < 1500)
pg_fatal("backup targets are not supported by this server version");
if (writerecoveryconf)
pg_fatal("recovery configuration cannot be written when a backup target is used");
AppendPlainCommandOption(&buf, use_new_option_syntax, "TABLESPACE_MAP");
if ((colon = strchr(backup_target, ':')) == NULL)
{
AppendStringCommandOption(&buf, use_new_option_syntax,
"TARGET", backup_target);
}
else
{
char *target;
target = pnstrdup(backup_target, colon - backup_target);
AppendStringCommandOption(&buf, use_new_option_syntax,
"TARGET", target);
AppendStringCommandOption(&buf, use_new_option_syntax,
"TARGET_DETAIL", colon + 1);
}
}
else if (serverMajor >= 1500)
AppendStringCommandOption(&buf, use_new_option_syntax,
"TARGET", "client");
if (compressloc == COMPRESS_LOCATION_SERVER)
{
if (!use_new_option_syntax)
pg_fatal("server does not support server-side compression");
AppendStringCommandOption(&buf, use_new_option_syntax,
"COMPRESSION", compression_algorithm);
if (compression_detail != NULL)
AppendStringCommandOption(&buf, use_new_option_syntax,
"COMPRESSION_DETAIL",
compression_detail);
}
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");
}
if (use_new_option_syntax && buf.len > 0)
basebkp = psprintf("BASE_BACKUP (%s)", buf.data);
else
basebkp = psprintf("BASE_BACKUP %s", buf.data);
if (PQsendQuery(conn, basebkp) == 0)
pg_fatal("could not send replication command \"%s\": %s",
"BASE_BACKUP", PQerrorMessage(conn));
/*
* Get the starting WAL location
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
pg_fatal("could not initiate base backup: %s",
PQerrorMessage(conn));
if (PQntuples(res) != 1)
pg_fatal("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);
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);
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_fatal("could not get backup header: %s",
PQerrorMessage(conn));
if (PQntuples(res) < 1)
pg_fatal("no data returned from server");
/*
* 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.
*
* Note that this is skipped for tar format backups and backups that
* the server is storing to a target location, since in that case we
* won't be storing anything into these directories and thus should
* not create them.
*/
if (backup_target == NULL && 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
*/
writing_to_stdout = format == 't' && basedir != NULL &&
strcmp(basedir, "-") == 0;
if (writing_to_stdout && PQntuples(res) > 1)
pg_fatal("can only write single tablespace to stdout, database has %d",
PQntuples(res));
/*
* If we're streaming WAL, start the streaming session before we start
* receiving the actual data chunks.
*/
if (includewal == STREAM_WAL)
{
pg_compress_algorithm wal_compress_algorithm;
int wal_compress_level;
if (verbose)
pg_log_info("starting background WAL receiver");
if (client_compress->algorithm == PG_COMPRESSION_GZIP)
{
wal_compress_algorithm = PG_COMPRESSION_GZIP;
wal_compress_level =
(client_compress->options & PG_COMPRESSION_OPTION_LEVEL)
!= 0 ? client_compress->level : 0;
}
else
{
wal_compress_algorithm = PG_COMPRESSION_NONE;
wal_compress_level = 0;
}
StartLogStreamer(xlogstart, starttli, sysidentifier,
wal_compress_algorithm, wal_compress_level);
}
if (serverMajor >= 1500)
{
/* Receive a single tar stream with everything. */
ReceiveArchiveStream(conn, client_compress);
}
else
{
/* Receive a tar file for each tablespace in turn */
for (i = 0; i < PQntuples(res); i++)
{
char archive_name[MAXPGPATH];
char *spclocation;
/*
* If we write the data out to a tar file, it will be named
* base.tar if it's the main data directory or <tablespaceoid>.tar
* if it's for another tablespace. CreateBackupStreamer() will
* arrange to add .gz to the archive name if pg_basebackup is
* performing compression.
*/
if (PQgetisnull(res, i, 0))
{
strlcpy(archive_name, "base.tar", sizeof(archive_name));
spclocation = NULL;
}
else
{
snprintf(archive_name, sizeof(archive_name),
"%s.tar", PQgetvalue(res, i, 0));
spclocation = PQgetvalue(res, i, 1);
}
ReceiveTarFile(conn, archive_name, spclocation, i,
client_compress);
}
/*
* Now receive backup manifest, if appropriate.
*
* If we're writing a tarfile to stdout, ReceiveTarFile will have
* already processed the backup manifest and included it in the output
* tarfile. Such a configuration doesn't allow for writing multiple
* files.
*
* If we're talking to an older server, it won't send a backup
* manifest, so don't try to receive one.
*/
if (!writing_to_stdout && manifest)
ReceiveBackupManifest(conn);
}
if (showprogress)
{
progress_update_filename(NULL);
progress_report(PQntuples(res), true, true);
}
PQclear(res);
/*
* Get the stop position
*/
res = PQgetResult(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
pg_fatal("backup failed: %s",
PQerrorMessage(conn));
if (PQntuples(res) != 1)
pg_fatal("no write-ahead log end position returned from server");
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_fatal("could not send command to background pipe: %m");
/* Just wait for the background process to exit */
r = waitpid(bgchild, &status, 0);
if (r == (pid_t) -1)
pg_fatal("could not wait for child process: %m");
if (r != bgchild)
pg_fatal("child %d died, expected %d", (int) r, (int) bgchild);
if (status != 0)
pg_fatal("%s", wait_result_to_str(status));
/* 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_fatal("could not parse write-ahead log location \"%s\"",
xlogend);
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_fatal("could not wait for child thread: %m");
}
if (GetExitCodeThread((HANDLE) bgchild_handle, &status) == 0)
{
_dosmaperr(GetLastError());
pg_fatal("could not get child thread exit status: %m");
}
if (status != 0)
pg_fatal("child thread exited with error %u",
(unsigned int) status);
/* 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, however, there's a backup target, we're not writing anything
* locally, so in that case we skip this step.
*/
if (do_sync && backup_target == NULL)
{
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);
}
}
/*
* After synchronizing data to disk, perform a durable rename of
* backup_manifest.tmp to backup_manifest, if we wrote such a file. This
* way, a failure or system crash before we reach this point will leave us
* without a backup_manifest file, decreasing the chances that a directory
* we leave behind will be mistaken for a valid backup.
*/
if (!writing_to_stdout && manifest && backup_target == NULL)
{
char tmp_filename[MAXPGPATH];
char filename[MAXPGPATH];
if (verbose)
pg_log_info("renaming backup_manifest.tmp to backup_manifest");
snprintf(tmp_filename, MAXPGPATH, "%s/backup_manifest.tmp", basedir);
snprintf(filename, MAXPGPATH, "%s/backup_manifest", basedir);
if (do_sync)
{
/* durable_rename emits its own log message in case of failure */
if (durable_rename(tmp_filename, filename) != 0)
exit(1);
}
else
{
if (rename(tmp_filename, filename) != 0)
pg_fatal("could not rename file \"%s\" to \"%s\": %m",
tmp_filename, filename);
}
}
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'},
{"target", required_argument, NULL, 't'},
{"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},
{"no-estimate-size", no_argument, NULL, 4},
{"no-manifest", no_argument, NULL, 5},
{"manifest-force-encode", no_argument, NULL, 6},
{"manifest-checksums", required_argument, NULL, 7},
{NULL, 0, NULL, 0}
};
int c;
int option_index;
char *compression_algorithm = "none";
char *compression_detail = NULL;
CompressionLocation compressloc = COMPRESS_LOCATION_UNSPECIFIED;
pg_compress_specification client_compress;
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:T:X:l:nNzZ:d:c:h:p:U:s:wWvP",
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_fatal("invalid output format \"%s\", must be \"plain\" or \"tar\"",
optarg);
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':
backup_target = pg_strdup(optarg);
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_fatal("invalid wal-method option \"%s\", must be \"fetch\", \"stream\", or \"none\"",
optarg);
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':
compression_algorithm = "gzip";
compression_detail = NULL;
compressloc = COMPRESS_LOCATION_UNSPECIFIED;
break;
case 'Z':
parse_compress_options(optarg, &compression_algorithm,
&compression_detail, &compressloc);
break;
case 'c':
if (pg_strcasecmp(optarg, "fast") == 0)
fastcheckpoint = true;
else if (pg_strcasecmp(optarg, "spread") == 0)
fastcheckpoint = false;
else
pg_fatal("invalid checkpoint argument \"%s\", must be \"fast\" or \"spread\"",
optarg);
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':
if (!option_parse_int(optarg, "-s/--status-interval", 0,
INT_MAX / 1000,
&standby_message_timeout))
exit(1);
standby_message_timeout *= 1000;
break;
case 'v':
verbose++;
break;
case 'P':
showprogress = true;
break;
case 3:
verify_checksums = false;
break;
case 4:
estimatesize = false;
break;
case 5:
manifest = false;
break;
case 6:
manifest_force_encode = true;
break;
case 7:
manifest_checksums = pg_strdup(optarg);
break;
default:
/* getopt_long already emitted a complaint */
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
}
/*
* Any non-option arguments?
*/
if (optind < argc)
{
pg_log_error("too many command-line arguments (first is \"%s\")",
argv[optind]);
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* Setting the backup target to 'client' is equivalent to leaving out the
* option. This logic allows us to assume elsewhere that the backup is
* being stored locally if and only if backup_target == NULL.
*/
if (backup_target != NULL && strcmp(backup_target, "client") == 0)
{
pg_free(backup_target);
backup_target = NULL;
}
/*
* Can't use --format with --target. Without --target, default format is
* tar.
*/
if (backup_target != NULL && format != '\0')
{
pg_log_error("cannot specify both format and backup target");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (format == '\0')
format = 'p';
/*
* Either directory or backup target should be specified, but not both
*/
if (basedir == NULL && backup_target == NULL)
{
pg_log_error("must specify output directory or backup target");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (basedir != NULL && backup_target != NULL)
{
pg_log_error("cannot specify both output directory and backup target");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* If the user has not specified where to perform backup compression,
* default to the client, unless the user specified --target, in which
* case the server is the only choice.
*/
if (compressloc == COMPRESS_LOCATION_UNSPECIFIED)
{
if (backup_target == NULL)
compressloc = COMPRESS_LOCATION_CLIENT;
else
compressloc = COMPRESS_LOCATION_SERVER;
}
/*
* If any compression that we're doing is happening on the client side, we
* must try to parse the compression algorithm and detail, but if it's all
* on the server side, then we're just going to pass through whatever was
* requested and let the server decide what to do.
*/
if (compressloc == COMPRESS_LOCATION_CLIENT)
{
pg_compress_algorithm alg;
char *error_detail;
if (!parse_compress_algorithm(compression_algorithm, &alg))
pg_fatal("unrecognized compression algorithm \"%s\"",
compression_algorithm);
parse_compress_specification(alg, compression_detail, &client_compress);
error_detail = validate_compress_specification(&client_compress);
if (error_detail != NULL)
pg_fatal("invalid compression specification: %s",
error_detail);
}
else
{
Assert(compressloc == COMPRESS_LOCATION_SERVER);
client_compress.algorithm = PG_COMPRESSION_NONE;
client_compress.options = 0;
}
/*
* Can't perform client-side compression if the backup is not being sent
* to the client.
*/
if (backup_target != NULL && compressloc == COMPRESS_LOCATION_CLIENT)
{
pg_log_error("client-side compression is not possible when a backup target is specified");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* Client-side compression doesn't make sense unless tar format is in use.
*/
if (format == 'p' && compressloc == COMPRESS_LOCATION_CLIENT &&
client_compress.algorithm != PG_COMPRESSION_NONE)
{
pg_log_error("only tar mode backups can be compressed");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* Sanity checks for WAL method.
*/
if (backup_target != NULL && includewal == STREAM_WAL)
{
pg_log_error("WAL cannot be streamed when a backup target is specified");
pg_log_error_hint("Try \"%s --help\" for more information.", 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");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (replication_slot && includewal != STREAM_WAL)
{
pg_log_error("replication slots can only be used with WAL streaming");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* Sanity checks for replication slot options.
*/
if (no_slot)
{
if (replication_slot)
{
pg_log_error("--no-slot cannot be used with slot name");
pg_log_error_hint("Try \"%s --help\" for more information.", 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");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (no_slot)
{
pg_log_error("%s and %s are incompatible options",
"--create-slot", "--no-slot");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
}
/*
* Sanity checks on WAL directory.
*/
if (xlog_dir)
{
if (backup_target != NULL)
{
pg_log_error("WAL directory location cannot be specified along with a backup target");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (format != 'p')
{
pg_log_error("WAL directory location can only be specified in plain mode");
pg_log_error_hint("Try \"%s --help\" for more information.", 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");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
}
/*
* Sanity checks for progress reporting options.
*/
if (showprogress && !estimatesize)
{
pg_log_error("%s and %s are incompatible options",
"--progress", "--no-estimate-size");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/*
* Sanity checks for backup manifest options.
*/
if (!manifest && manifest_checksums != NULL)
{
pg_log_error("%s and %s are incompatible options",
"--no-manifest", "--manifest-checksums");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
if (!manifest && manifest_force_encode)
{
pg_log_error("%s and %s are incompatible options",
"--no-manifest", "--manifest-force-encode");
pg_log_error_hint("Try \"%s --help\" for more information.", progname);
exit(1);
}
/* connection in replication mode to server */
conn = GetConnection();
if (!conn)
{
/* Error message already written in GetConnection() */
exit(1);
}
atexit(disconnect_atexit);
#ifndef WIN32
/*
* Trap SIGCHLD to be able to handle the WAL stream process exiting. There
* is no SIGCHLD on Windows, there we rely on the background thread
* setting the signal variable on unexpected but graceful exit. If the WAL
* stream thread crashes on Windows it will bring down the entire process
* as it's a thread, so there is nothing to catch should that happen. A
* crash on UNIX will be caught by the signal handler.
*/
pqsignal(SIGCHLD, sigchld_handler);
#endif
/*
* 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);
/* Backup manifests are supported in 13 and newer versions */
if (PQserverVersion(conn) < MINIMUM_VERSION_FOR_MANIFESTS)
manifest = false;
/*
* If an output directory was specified, verify that it exists, or create
* it. Note that for a tar backup, an output directory of "-" means we are
* writing to stdout, so do nothing in that case.
*/
if (basedir != NULL && (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");
if (symlink(xlog_dir, linkloc) != 0)
pg_fatal("could not create symbolic link \"%s\": %m", linkloc);
free(linkloc);
}
BaseBackup(compression_algorithm, compression_detail, compressloc,
&client_compress);
success = true;
return 0;
}
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