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a0b4c5a20a
Since the replication protocol deals with TimestampTz, we need to care for the floating point case as well in the frontend tools. Fujii Masao, with changes from Magnus Hagander
1409 lines
34 KiB
C
1409 lines
34 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_basebackup.c - receive a base backup using streaming replication protocol
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*
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* Author: Magnus Hagander <magnus@hagander.net>
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*
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* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/bin/pg_basebackup/pg_basebackup.c
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*-------------------------------------------------------------------------
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*/
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/*
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* We have to use postgres.h not postgres_fe.h here, because there's so much
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* backend-only stuff in the XLOG include files we need. But we need a
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* frontend-ish environment otherwise. Hence this ugly hack.
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*/
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#define FRONTEND 1
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#include "postgres.h"
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#include "libpq-fe.h"
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#ifdef HAVE_LIBZ
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#include <zlib.h>
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#endif
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#include "getopt_long.h"
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#include "receivelog.h"
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#include "streamutil.h"
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/* Global options */
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char *basedir = NULL;
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char format = 'p'; /* p(lain)/t(ar) */
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char *label = "pg_basebackup base backup";
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bool showprogress = false;
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int verbose = 0;
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int compresslevel = 0;
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bool includewal = false;
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bool streamwal = false;
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bool fastcheckpoint = false;
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int standby_message_timeout = 10 * 1000; /* 10 sec = default */
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/* Progress counters */
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static uint64 totalsize;
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static uint64 totaldone;
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static int tablespacecount;
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/* Pipe to communicate with background wal receiver process */
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#ifndef WIN32
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static int bgpipe[2] = {-1, -1};
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#endif
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/* Handle to child process */
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static pid_t bgchild = -1;
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/* End position for xlog streaming, empty string if unknown yet */
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static XLogRecPtr xlogendptr;
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#ifndef WIN32
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static int has_xlogendptr = 0;
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#else
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static volatile LONG has_xlogendptr = 0;
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#endif
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/* Function headers */
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static void usage(void);
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static void verify_dir_is_empty_or_create(char *dirname);
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static void progress_report(int tablespacenum, const char *filename);
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static void ReceiveTarFile(PGconn *conn, PGresult *res, int rownum);
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static void ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum);
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static void BaseBackup(void);
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static bool reached_end_position(XLogRecPtr segendpos, uint32 timeline, bool segment_finished);
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#ifdef HAVE_LIBZ
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static const char *
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get_gz_error(gzFile gzf)
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{
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int errnum;
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const char *errmsg;
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errmsg = gzerror(gzf, &errnum);
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if (errnum == Z_ERRNO)
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return strerror(errno);
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else
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return errmsg;
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}
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#endif
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static void
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usage(void)
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{
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printf(_("%s takes a base backup of a running PostgreSQL server.\n\n"),
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progname);
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printf(_("Usage:\n"));
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printf(_(" %s [OPTION]...\n"), progname);
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printf(_("\nOptions controlling the output:\n"));
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printf(_(" -D, --pgdata=DIRECTORY receive base backup into directory\n"));
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printf(_(" -F, --format=p|t output format (plain (default), tar)\n"));
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printf(_(" -x, --xlog=fetch|stream include required WAL files in backup\n"));
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printf(_(" -z, --gzip compress tar output\n"));
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printf(_(" -Z, --compress=0-9 compress tar output with given compression level\n"));
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printf(_("\nGeneral options:\n"));
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printf(_(" -c, --checkpoint=fast|spread\n"
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" set fast or spread checkpointing\n"));
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printf(_(" -l, --label=LABEL set backup label\n"));
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printf(_(" -P, --progress show progress information\n"));
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printf(_(" -v, --verbose output verbose messages\n"));
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printf(_(" --help show this help, then exit\n"));
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printf(_(" --version output version information, then exit\n"));
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printf(_("\nConnection options:\n"));
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printf(_(" -s, --statusint=INTERVAL time between status packets sent to server (in seconds)\n"));
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printf(_(" -h, --host=HOSTNAME database server host or socket directory\n"));
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printf(_(" -p, --port=PORT database server port number\n"));
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printf(_(" -U, --username=NAME connect as specified database user\n"));
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printf(_(" -w, --no-password never prompt for password\n"));
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printf(_(" -W, --password force password prompt (should happen automatically)\n"));
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printf(_("\nReport bugs to <pgsql-bugs@postgresql.org>.\n"));
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}
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/*
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* Called in the background process every time data is received.
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* On Unix, we check to see if there is any data on our pipe
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* (which would mean we have a stop position), and if it is, check if
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* it is time to stop.
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* On Windows, we are in a single process, so we can just check if it's
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* time to stop.
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*/
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static bool
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reached_end_position(XLogRecPtr segendpos, uint32 timeline, bool segment_finished)
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{
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if (!has_xlogendptr)
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{
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#ifndef WIN32
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fd_set fds;
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struct timeval tv;
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int r;
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/*
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* Don't have the end pointer yet - check our pipe to see if it has
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* been sent yet.
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*/
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FD_ZERO(&fds);
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FD_SET(bgpipe[0], &fds);
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MemSet(&tv, 0, sizeof(tv));
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r = select(bgpipe[0] + 1, &fds, NULL, NULL, &tv);
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if (r == 1)
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{
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char xlogend[64];
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MemSet(xlogend, 0, sizeof(xlogend));
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r = read(bgpipe[0], xlogend, sizeof(xlogend));
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if (r < 0)
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{
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fprintf(stderr, _("%s: could not read from ready pipe: %s\n"),
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progname, strerror(errno));
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exit(1);
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}
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if (sscanf(xlogend, "%X/%X", &xlogendptr.xlogid, &xlogendptr.xrecoff) != 2)
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{
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fprintf(stderr, _("%s: could not parse xlog end position \"%s\"\n"),
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progname, xlogend);
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exit(1);
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}
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has_xlogendptr = 1;
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/*
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* Fall through to check if we've reached the point further
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* already.
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*/
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}
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else
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{
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/*
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* No data received on the pipe means we don't know the end
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* position yet - so just say it's not time to stop yet.
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*/
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return false;
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}
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#else
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/*
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* On win32, has_xlogendptr is set by the main thread, so if it's not
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* set here, we just go back and wait until it shows up.
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*/
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return false;
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#endif
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}
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/*
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* At this point we have an end pointer, so compare it to the current
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* position to figure out if it's time to stop.
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*/
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if (segendpos.xlogid > xlogendptr.xlogid ||
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(segendpos.xlogid == xlogendptr.xlogid &&
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segendpos.xrecoff >= xlogendptr.xrecoff))
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return true;
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/*
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* Have end pointer, but haven't reached it yet - so tell the caller to
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* keep streaming.
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*/
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return false;
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}
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typedef struct
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{
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PGconn *bgconn;
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XLogRecPtr startptr;
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char xlogdir[MAXPGPATH];
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char *sysidentifier;
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int timeline;
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} logstreamer_param;
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static int
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LogStreamerMain(logstreamer_param * param)
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{
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if (!ReceiveXlogStream(param->bgconn, param->startptr, param->timeline,
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param->sysidentifier, param->xlogdir,
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reached_end_position, standby_message_timeout, true))
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/*
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* Any errors will already have been reported in the function process,
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* but we need to tell the parent that we didn't shutdown in a nice
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* way.
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*/
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return 1;
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PQfinish(param->bgconn);
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return 0;
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}
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/*
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* Initiate background process for receiving xlog during the backup.
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* The background stream will use its own database connection so we can
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* stream the logfile in parallel with the backups.
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*/
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static void
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StartLogStreamer(char *startpos, uint32 timeline, char *sysidentifier)
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{
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logstreamer_param *param;
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param = xmalloc0(sizeof(logstreamer_param));
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param->timeline = timeline;
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param->sysidentifier = sysidentifier;
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/* Convert the starting position */
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if (sscanf(startpos, "%X/%X", ¶m->startptr.xlogid, ¶m->startptr.xrecoff) != 2)
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{
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fprintf(stderr, _("%s: invalid format of xlog location: %s\n"),
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progname, startpos);
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disconnect_and_exit(1);
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}
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/* Round off to even segment position */
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param->startptr.xrecoff -= param->startptr.xrecoff % XLOG_SEG_SIZE;
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#ifndef WIN32
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/* Create our background pipe */
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if (pipe(bgpipe) < 0)
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{
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fprintf(stderr, _("%s: could not create pipe for background process: %s\n"),
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progname, strerror(errno));
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disconnect_and_exit(1);
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}
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#endif
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/* Get a second connection */
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param->bgconn = GetConnection();
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if (!param->bgconn)
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/* Error message already written in GetConnection() */
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exit(1);
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/*
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* Always in plain format, so we can write to basedir/pg_xlog. But the
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* directory entry in the tar file may arrive later, so make sure it's
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* created before we start.
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*/
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snprintf(param->xlogdir, sizeof(param->xlogdir), "%s/pg_xlog", basedir);
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verify_dir_is_empty_or_create(param->xlogdir);
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/*
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* Start a child process and tell it to start streaming. On Unix, this is
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* a fork(). On Windows, we create a thread.
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*/
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#ifndef WIN32
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bgchild = fork();
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if (bgchild == 0)
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{
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/* in child process */
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exit(LogStreamerMain(param));
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}
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else if (bgchild < 0)
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{
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fprintf(stderr, _("%s: could not create background process: %s\n"),
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progname, strerror(errno));
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disconnect_and_exit(1);
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}
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/*
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* Else we are in the parent process and all is well.
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*/
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#else /* WIN32 */
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bgchild = _beginthreadex(NULL, 0, (void *) LogStreamerMain, param, 0, NULL);
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if (bgchild == 0)
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{
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fprintf(stderr, _("%s: could not create background thread: %s\n"),
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progname, strerror(errno));
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disconnect_and_exit(1);
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}
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#endif
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}
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/*
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* Verify that the given directory exists and is empty. If it does not
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* exist, it is created. If it exists but is not empty, an error will
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* be give and the process ended.
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*/
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static void
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verify_dir_is_empty_or_create(char *dirname)
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{
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switch (pg_check_dir(dirname))
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{
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case 0:
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/*
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* Does not exist, so create
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*/
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if (pg_mkdir_p(dirname, S_IRWXU) == -1)
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{
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fprintf(stderr,
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_("%s: could not create directory \"%s\": %s\n"),
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progname, dirname, strerror(errno));
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disconnect_and_exit(1);
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}
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return;
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case 1:
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/*
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* Exists, empty
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*/
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return;
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case 2:
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/*
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* Exists, not empty
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*/
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fprintf(stderr,
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_("%s: directory \"%s\" exists but is not empty\n"),
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progname, dirname);
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disconnect_and_exit(1);
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case -1:
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/*
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* Access problem
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*/
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fprintf(stderr, _("%s: could not access directory \"%s\": %s\n"),
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progname, dirname, strerror(errno));
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disconnect_and_exit(1);
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}
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}
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/*
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* Print a progress report based on the global variables. If verbose output
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* is enabled, also print the current file name.
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*/
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static void
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progress_report(int tablespacenum, const char *filename)
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{
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int percent = (int) ((totaldone / 1024) * 100 / totalsize);
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char totaldone_str[32];
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char totalsize_str[32];
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/*
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* Avoid overflowing past 100% or the full size. This may make the total
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* size number change as we approach the end of the backup (the estimate
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* will always be wrong if WAL is included), but that's better than having
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* the done column be bigger than the total.
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*/
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if (percent > 100)
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percent = 100;
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if (totaldone / 1024 > totalsize)
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totalsize = totaldone / 1024;
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/*
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* Separate step to keep platform-dependent format code out of
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* translatable strings. And we only test for INT64_FORMAT availability
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* in snprintf, not fprintf.
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*/
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snprintf(totaldone_str, sizeof(totaldone_str), INT64_FORMAT, totaldone / 1024);
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snprintf(totalsize_str, sizeof(totalsize_str), INT64_FORMAT, totalsize);
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if (verbose)
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{
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if (!filename)
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/*
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* No filename given, so clear the status line (used for last
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* call)
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*/
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fprintf(stderr,
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ngettext("%s/%s kB (100%%), %d/%d tablespace %35s",
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"%s/%s kB (100%%), %d/%d tablespaces %35s",
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tablespacecount),
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totaldone_str, totalsize_str, tablespacenum, tablespacecount, "");
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else
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fprintf(stderr,
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ngettext("%s/%s kB (%d%%), %d/%d tablespace (%-30.30s)",
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"%s/%s kB (%d%%), %d/%d tablespaces (%-30.30s)",
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tablespacecount),
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totaldone_str, totalsize_str, percent, tablespacenum, tablespacecount, filename);
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}
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else
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fprintf(stderr,
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ngettext("%s/%s kB (%d%%), %d/%d tablespace",
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"%s/%s kB (%d%%), %d/%d tablespaces",
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tablespacecount),
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totaldone_str, totalsize_str, percent, tablespacenum, tablespacecount);
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fprintf(stderr, "\r");
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}
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/*
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* Receive a tar format file from the connection to the server, and write
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* the data from this file directly into a tar file. If compression is
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* enabled, the data will be compressed while written to the file.
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*
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* The file will be named base.tar[.gz] if it's for the main data directory
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* or <tablespaceoid>.tar[.gz] if it's for another tablespace.
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*
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* No attempt to inspect or validate the contents of the file is done.
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*/
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static void
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ReceiveTarFile(PGconn *conn, PGresult *res, int rownum)
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{
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char filename[MAXPGPATH];
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char *copybuf = NULL;
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FILE *tarfile = NULL;
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#ifdef HAVE_LIBZ
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gzFile ztarfile = NULL;
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#endif
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if (PQgetisnull(res, rownum, 0))
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/*
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* Base tablespaces
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*/
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if (strcmp(basedir, "-") == 0)
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{
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#ifdef HAVE_LIBZ
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if (compresslevel != 0)
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{
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ztarfile = gzdopen(dup(fileno(stdout)), "wb");
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if (gzsetparams(ztarfile, compresslevel, Z_DEFAULT_STRATEGY) != Z_OK)
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{
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fprintf(stderr, _("%s: could not set compression level %d: %s\n"),
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progname, compresslevel, get_gz_error(ztarfile));
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disconnect_and_exit(1);
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}
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}
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else
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#endif
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tarfile = stdout;
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}
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else
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{
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#ifdef HAVE_LIBZ
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if (compresslevel != 0)
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{
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snprintf(filename, sizeof(filename), "%s/base.tar.gz", basedir);
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ztarfile = gzopen(filename, "wb");
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if (gzsetparams(ztarfile, compresslevel, Z_DEFAULT_STRATEGY) != Z_OK)
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{
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fprintf(stderr, _("%s: could not set compression level %d: %s\n"),
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progname, compresslevel, get_gz_error(ztarfile));
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disconnect_and_exit(1);
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}
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}
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else
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#endif
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{
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snprintf(filename, sizeof(filename), "%s/base.tar", basedir);
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tarfile = fopen(filename, "wb");
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}
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}
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else
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{
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/*
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* Specific tablespace
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*/
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#ifdef HAVE_LIBZ
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if (compresslevel != 0)
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{
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snprintf(filename, sizeof(filename), "%s/%s.tar.gz", basedir, PQgetvalue(res, rownum, 0));
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ztarfile = gzopen(filename, "wb");
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if (gzsetparams(ztarfile, compresslevel, Z_DEFAULT_STRATEGY) != Z_OK)
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{
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fprintf(stderr, _("%s: could not set compression level %d: %s\n"),
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progname, compresslevel, get_gz_error(ztarfile));
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disconnect_and_exit(1);
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}
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}
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else
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#endif
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{
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snprintf(filename, sizeof(filename), "%s/%s.tar", basedir, PQgetvalue(res, rownum, 0));
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tarfile = fopen(filename, "wb");
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}
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}
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|
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#ifdef HAVE_LIBZ
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if (compresslevel != 0)
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{
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if (!ztarfile)
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{
|
|
/* Compression is in use */
|
|
fprintf(stderr, _("%s: could not create compressed file \"%s\": %s\n"),
|
|
progname, filename, get_gz_error(ztarfile));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Either no zlib support, or zlib support but compresslevel = 0 */
|
|
if (!tarfile)
|
|
{
|
|
fprintf(stderr, _("%s: could not create file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the COPY data stream
|
|
*/
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_COPY_OUT)
|
|
{
|
|
fprintf(stderr, _("%s: could not get COPY data stream: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
int r;
|
|
|
|
if (copybuf != NULL)
|
|
{
|
|
PQfreemem(copybuf);
|
|
copybuf = NULL;
|
|
}
|
|
|
|
r = PQgetCopyData(conn, ©buf, 0);
|
|
if (r == -1)
|
|
{
|
|
/*
|
|
* End of chunk. Close 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));
|
|
#ifdef HAVE_LIBZ
|
|
if (ztarfile != NULL)
|
|
{
|
|
if (gzwrite(ztarfile, zerobuf, sizeof(zerobuf)) != sizeof(zerobuf))
|
|
{
|
|
fprintf(stderr, _("%s: could not write to compressed file \"%s\": %s\n"),
|
|
progname, filename, get_gz_error(ztarfile));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (fwrite(zerobuf, sizeof(zerobuf), 1, tarfile) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: could not write to file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_LIBZ
|
|
if (ztarfile != NULL)
|
|
{
|
|
if (gzclose(ztarfile) != 0)
|
|
{
|
|
fprintf(stderr, _("%s: could not close compressed file \"%s\": %s\n"),
|
|
progname, filename, get_gz_error(ztarfile));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (strcmp(basedir, "-") != 0)
|
|
{
|
|
if (fclose(tarfile) != 0)
|
|
{
|
|
fprintf(stderr, _("%s: could not close file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
else if (r == -2)
|
|
{
|
|
fprintf(stderr, _("%s: could not read COPY data: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
#ifdef HAVE_LIBZ
|
|
if (ztarfile != NULL)
|
|
{
|
|
if (gzwrite(ztarfile, copybuf, r) != r)
|
|
{
|
|
fprintf(stderr, _("%s: could not write to compressed file \"%s\": %s\n"),
|
|
progname, filename, get_gz_error(ztarfile));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
if (fwrite(copybuf, r, 1, tarfile) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: could not write to file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
totaldone += r;
|
|
if (showprogress)
|
|
progress_report(rownum, filename);
|
|
} /* while (1) */
|
|
|
|
if (copybuf != NULL)
|
|
PQfreemem(copybuf);
|
|
}
|
|
|
|
/*
|
|
* 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 directory, since relocation of tablespaces is not
|
|
* supported.
|
|
*/
|
|
static void
|
|
ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum)
|
|
{
|
|
char current_path[MAXPGPATH];
|
|
char filename[MAXPGPATH];
|
|
int current_len_left;
|
|
int current_padding = 0;
|
|
char *copybuf = NULL;
|
|
FILE *file = NULL;
|
|
|
|
if (PQgetisnull(res, rownum, 0))
|
|
strcpy(current_path, basedir);
|
|
else
|
|
strcpy(current_path, PQgetvalue(res, rownum, 1));
|
|
|
|
/*
|
|
* Get the COPY data
|
|
*/
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_COPY_OUT)
|
|
{
|
|
fprintf(stderr, _("%s: could not get COPY data stream: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
while (1)
|
|
{
|
|
int r;
|
|
|
|
if (copybuf != NULL)
|
|
{
|
|
PQfreemem(copybuf);
|
|
copybuf = NULL;
|
|
}
|
|
|
|
r = PQgetCopyData(conn, ©buf, 0);
|
|
|
|
if (r == -1)
|
|
{
|
|
/*
|
|
* End of chunk
|
|
*/
|
|
if (file)
|
|
fclose(file);
|
|
|
|
break;
|
|
}
|
|
else if (r == -2)
|
|
{
|
|
fprintf(stderr, _("%s: could not read COPY data: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
if (file == NULL)
|
|
{
|
|
int filemode;
|
|
|
|
/*
|
|
* No current file, so this must be the header for a new file
|
|
*/
|
|
if (r != 512)
|
|
{
|
|
fprintf(stderr, _("%s: invalid tar block header size: %d\n"),
|
|
progname, r);
|
|
disconnect_and_exit(1);
|
|
}
|
|
totaldone += 512;
|
|
|
|
if (sscanf(copybuf + 124, "%11o", ¤t_len_left) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: could not parse file size\n"),
|
|
progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/* Set permissions on the file */
|
|
if (sscanf(©buf[100], "%07o ", &filemode) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: could not parse file mode\n"),
|
|
progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/*
|
|
* 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, S_IRWXU) != 0)
|
|
{
|
|
/*
|
|
* When streaming WAL, pg_xlog will have been created
|
|
* by the wal receiver process, so just ignore failure
|
|
* on that.
|
|
*/
|
|
if (!streamwal || strcmp(filename + strlen(filename) - 8, "/pg_xlog") != 0)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: could not create directory \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
#ifndef WIN32
|
|
if (chmod(filename, (mode_t) filemode))
|
|
fprintf(stderr, _("%s: could not set permissions on directory \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
#endif
|
|
}
|
|
else if (copybuf[156] == '2')
|
|
{
|
|
/*
|
|
* Symbolic link
|
|
*/
|
|
filename[strlen(filename) - 1] = '\0'; /* Remove trailing slash */
|
|
if (symlink(©buf[157], filename) != 0)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: could not create symbolic link from \"%s\" to \"%s\": %s\n"),
|
|
progname, filename, ©buf[157], strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, _("%s: unrecognized link indicator \"%c\"\n"),
|
|
progname, copybuf[156]);
|
|
disconnect_and_exit(1);
|
|
}
|
|
continue; /* directory or link handled */
|
|
}
|
|
|
|
/*
|
|
* regular file
|
|
*/
|
|
file = fopen(filename, "wb");
|
|
if (!file)
|
|
{
|
|
fprintf(stderr, _("%s: could not create file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
#ifndef WIN32
|
|
if (chmod(filename, (mode_t) filemode))
|
|
fprintf(stderr, _("%s: could not set permissions on file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
#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)
|
|
{
|
|
fprintf(stderr, _("%s: could not write to file \"%s\": %s\n"),
|
|
progname, filename, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
totaldone += r;
|
|
if (showprogress)
|
|
progress_report(rownum, filename);
|
|
|
|
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 */
|
|
|
|
if (file != NULL)
|
|
{
|
|
fprintf(stderr, _("%s: COPY stream ended before last file was finished\n"), progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
if (copybuf != NULL)
|
|
PQfreemem(copybuf);
|
|
}
|
|
|
|
|
|
static void
|
|
BaseBackup(void)
|
|
{
|
|
PGresult *res;
|
|
char *sysidentifier;
|
|
uint32 timeline;
|
|
char current_path[MAXPGPATH];
|
|
char escaped_label[MAXPGPATH];
|
|
int i;
|
|
char xlogstart[64];
|
|
char xlogend[64];
|
|
|
|
/*
|
|
* Connect in replication mode to the server
|
|
*/
|
|
conn = GetConnection();
|
|
if (!conn)
|
|
/* Error message already written in GetConnection() */
|
|
exit(1);
|
|
|
|
/*
|
|
* Run IDENTIFY_SYSTEM so we can get the timeline
|
|
*/
|
|
res = PQexec(conn, "IDENTIFY_SYSTEM");
|
|
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
|
{
|
|
fprintf(stderr, _("%s: could not identify system: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (PQntuples(res) != 1 || PQnfields(res) != 3)
|
|
{
|
|
fprintf(stderr, _("%s: could not identify system, got %d rows and %d fields\n"),
|
|
progname, PQntuples(res), PQnfields(res));
|
|
disconnect_and_exit(1);
|
|
}
|
|
sysidentifier = strdup(PQgetvalue(res, 0, 0));
|
|
timeline = atoi(PQgetvalue(res, 0, 1));
|
|
PQclear(res);
|
|
|
|
/*
|
|
* Start the actual backup
|
|
*/
|
|
PQescapeStringConn(conn, escaped_label, label, sizeof(escaped_label), &i);
|
|
snprintf(current_path, sizeof(current_path), "BASE_BACKUP LABEL '%s' %s %s %s %s",
|
|
escaped_label,
|
|
showprogress ? "PROGRESS" : "",
|
|
includewal && !streamwal ? "WAL" : "",
|
|
fastcheckpoint ? "FAST" : "",
|
|
includewal ? "NOWAIT" : "");
|
|
|
|
if (PQsendQuery(conn, current_path) == 0)
|
|
{
|
|
fprintf(stderr, _("%s: could not send base backup command: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/*
|
|
* Get the starting xlog position
|
|
*/
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
|
{
|
|
fprintf(stderr, _("%s: could not initiate base backup: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (PQntuples(res) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: no start point returned from server\n"),
|
|
progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
strcpy(xlogstart, PQgetvalue(res, 0, 0));
|
|
if (verbose && includewal)
|
|
fprintf(stderr, "xlog start point: %s\n", xlogstart);
|
|
PQclear(res);
|
|
MemSet(xlogend, 0, sizeof(xlogend));
|
|
|
|
/*
|
|
* Get the header
|
|
*/
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
|
{
|
|
fprintf(stderr, _("%s: could not get backup header: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (PQntuples(res) < 1)
|
|
{
|
|
fprintf(stderr, _("%s: no data returned from server\n"), progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/*
|
|
* Sum up the total size, for progress reporting
|
|
*/
|
|
totalsize = totaldone = 0;
|
|
tablespacecount = PQntuples(res);
|
|
for (i = 0; i < PQntuples(res); i++)
|
|
{
|
|
if (showprogress)
|
|
totalsize += 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))
|
|
verify_dir_is_empty_or_create(PQgetvalue(res, i, 1));
|
|
}
|
|
|
|
/*
|
|
* When writing to stdout, require a single tablespace
|
|
*/
|
|
if (format == 't' && strcmp(basedir, "-") == 0 && PQntuples(res) > 1)
|
|
{
|
|
fprintf(stderr, _("%s: can only write single tablespace to stdout, database has %d\n"),
|
|
progname, PQntuples(res));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/*
|
|
* If we're streaming WAL, start the streaming session before we start
|
|
* receiving the actual data chunks.
|
|
*/
|
|
if (streamwal)
|
|
{
|
|
if (verbose)
|
|
fprintf(stderr, _("%s: starting background WAL receiver\n"),
|
|
progname);
|
|
StartLogStreamer(xlogstart, timeline, 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);
|
|
fprintf(stderr, "\n"); /* Need to move to next line */
|
|
}
|
|
PQclear(res);
|
|
|
|
/*
|
|
* Get the stop position
|
|
*/
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_TUPLES_OK)
|
|
{
|
|
fprintf(stderr, _("%s: could not get WAL end position from server: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (PQntuples(res) != 1)
|
|
{
|
|
fprintf(stderr, _("%s: no WAL end position returned from server\n"),
|
|
progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
strcpy(xlogend, PQgetvalue(res, 0, 0));
|
|
if (verbose && includewal)
|
|
fprintf(stderr, "xlog end point: %s\n", xlogend);
|
|
PQclear(res);
|
|
|
|
res = PQgetResult(conn);
|
|
if (PQresultStatus(res) != PGRES_COMMAND_OK)
|
|
{
|
|
fprintf(stderr, _("%s: final receive failed: %s"),
|
|
progname, PQerrorMessage(conn));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
if (bgchild > 0)
|
|
{
|
|
#ifndef WIN32
|
|
int status;
|
|
int r;
|
|
#else
|
|
DWORD status;
|
|
#endif
|
|
|
|
if (verbose)
|
|
fprintf(stderr, _("%s: waiting for background process to finish streaming...\n"), progname);
|
|
|
|
#ifndef WIN32
|
|
if (write(bgpipe[1], xlogend, strlen(xlogend)) != strlen(xlogend))
|
|
{
|
|
fprintf(stderr, _("%s: could not send command to background pipe: %s\n"),
|
|
progname, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
|
|
/* Just wait for the background process to exit */
|
|
r = waitpid(bgchild, &status, 0);
|
|
if (r == -1)
|
|
{
|
|
fprintf(stderr, _("%s: could not wait for child process: %s\n"),
|
|
progname, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (r != bgchild)
|
|
{
|
|
fprintf(stderr, _("%s: child %d died, expected %d\n"),
|
|
progname, r, (int) bgchild);
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (!WIFEXITED(status))
|
|
{
|
|
fprintf(stderr, _("%s: child process did not exit normally\n"),
|
|
progname);
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (WEXITSTATUS(status) != 0)
|
|
{
|
|
fprintf(stderr, _("%s: child process exited with error %d\n"),
|
|
progname, WEXITSTATUS(status));
|
|
disconnect_and_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", &xlogendptr.xlogid, &xlogendptr.xrecoff) != 2)
|
|
{
|
|
fprintf(stderr, _("%s: could not parse xlog end position \"%s\"\n"),
|
|
progname, xlogend);
|
|
disconnect_and_exit(1);
|
|
}
|
|
InterlockedIncrement(&has_xlogendptr);
|
|
|
|
/* First wait for the thread to exit */
|
|
if (WaitForSingleObjectEx((HANDLE) bgchild, INFINITE, FALSE) != WAIT_OBJECT_0)
|
|
{
|
|
_dosmaperr(GetLastError());
|
|
fprintf(stderr, _("%s: could not wait for child thread: %s\n"),
|
|
progname, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (GetExitCodeThread((HANDLE) bgchild, &status) == 0)
|
|
{
|
|
_dosmaperr(GetLastError());
|
|
fprintf(stderr, _("%s: could not get child thread exit status: %s\n"),
|
|
progname, strerror(errno));
|
|
disconnect_and_exit(1);
|
|
}
|
|
if (status != 0)
|
|
{
|
|
fprintf(stderr, _("%s: child thread exited with error %u\n"),
|
|
progname, (unsigned int) status);
|
|
disconnect_and_exit(1);
|
|
}
|
|
/* Exited normally, we're happy */
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* End of copy data. Final result is already checked inside the loop.
|
|
*/
|
|
PQclear(res);
|
|
PQfinish(conn);
|
|
|
|
if (verbose)
|
|
fprintf(stderr, "%s: base backup completed\n", progname);
|
|
}
|
|
|
|
|
|
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'},
|
|
{"xlog", required_argument, NULL, 'x'},
|
|
{"gzip", no_argument, NULL, 'z'},
|
|
{"compress", required_argument, NULL, 'Z'},
|
|
{"label", required_argument, NULL, 'l'},
|
|
{"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'},
|
|
{"statusint", required_argument, NULL, 's'},
|
|
{"verbose", no_argument, NULL, 'v'},
|
|
{"progress", no_argument, NULL, 'P'},
|
|
{NULL, 0, NULL, 0}
|
|
};
|
|
int c;
|
|
|
|
int option_index;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
while ((c = getopt_long(argc, argv, "D:F:x:l:zZ:c:h:p:U:s:wWvP",
|
|
long_options, &option_index)) != -1)
|
|
{
|
|
switch (c)
|
|
{
|
|
case 'D':
|
|
basedir = xstrdup(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
|
|
{
|
|
fprintf(stderr, _("%s: invalid output format \"%s\", must be \"plain\" or \"tar\"\n"),
|
|
progname, optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'x':
|
|
includewal = true;
|
|
if (strcmp(optarg, "f") == 0 ||
|
|
strcmp(optarg, "fetch") == 0)
|
|
streamwal = false;
|
|
else if (strcmp(optarg, "s") == 0 ||
|
|
strcmp(optarg, "stream") == 0)
|
|
streamwal = true;
|
|
else
|
|
{
|
|
fprintf(stderr, _("%s: invalid xlog option \"%s\", must be empty, \"fetch\", or \"stream\"\n"),
|
|
progname, optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'l':
|
|
label = xstrdup(optarg);
|
|
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)
|
|
{
|
|
fprintf(stderr, _("%s: invalid compression level \"%s\"\n"),
|
|
progname, optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'c':
|
|
if (pg_strcasecmp(optarg, "fast") == 0)
|
|
fastcheckpoint = true;
|
|
else if (pg_strcasecmp(optarg, "spread") == 0)
|
|
fastcheckpoint = false;
|
|
else
|
|
{
|
|
fprintf(stderr, _("%s: invalid checkpoint argument \"%s\", must be \"fast\" or \"spread\"\n"),
|
|
progname, optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'h':
|
|
dbhost = xstrdup(optarg);
|
|
break;
|
|
case 'p':
|
|
dbport = xstrdup(optarg);
|
|
break;
|
|
case 'U':
|
|
dbuser = xstrdup(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)
|
|
{
|
|
fprintf(stderr, _("%s: invalid status interval \"%s\"\n"),
|
|
progname, optarg);
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'v':
|
|
verbose++;
|
|
break;
|
|
case 'P':
|
|
showprogress = true;
|
|
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)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: too many command-line arguments (first is \"%s\")\n"),
|
|
progname, argv[optind]);
|
|
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Required arguments
|
|
*/
|
|
if (basedir == NULL)
|
|
{
|
|
fprintf(stderr, _("%s: no target directory specified\n"), progname);
|
|
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Mutually exclusive arguments
|
|
*/
|
|
if (format == 'p' && compresslevel != 0)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: only tar mode backups can be compressed\n"),
|
|
progname);
|
|
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
if (format != 'p' && streamwal)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: wal streaming can only be used in plain mode\n"),
|
|
progname);
|
|
fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
|
|
progname);
|
|
exit(1);
|
|
}
|
|
|
|
#ifndef HAVE_LIBZ
|
|
if (compresslevel != 0)
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: this build does not support compression\n"),
|
|
progname);
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* 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);
|
|
|
|
|
|
BaseBackup();
|
|
|
|
return 0;
|
|
}
|