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pg_backup_tar.c
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pg_backup_tar.c
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/*-------------------------------------------------------------------------
*
* pg_backup_tar.c
*
* This file is copied from the 'files' format file, but dumps data into
* one temp file then sends it to the output TAR archive.
*
* The tar format also includes a 'restore.sql' script which is there for
* the benefit of humans. This script is never used by pg_restore.
*
* NOTE: If you untar the created 'tar' file, the resulting files are
* compatible with the 'directory' format. Please keep the two formats in
* sync.
*
* See the headers to pg_backup_directory & pg_restore for more details.
*
* Copyright (c) 2000, Philip Warner
* Rights are granted to use this software in any way so long
* as this notice is not removed.
*
* The author is not responsible for loss or damages that may
* result from it's use.
*
*
* IDENTIFICATION
* src/bin/pg_dump/pg_backup_tar.c
*
*-------------------------------------------------------------------------
*/
#include "pg_backup.h"
#include "pg_backup_archiver.h"
#include "pg_backup_tar.h"
#include "pg_backup_utils.h"
#include "parallel.h"
#include "pgtar.h"
#include <sys/stat.h>
#include <ctype.h>
#include <limits.h>
#include <unistd.h>
static void _ArchiveEntry(ArchiveHandle *AH, TocEntry *te);
static void _StartData(ArchiveHandle *AH, TocEntry *te);
static void _WriteData(ArchiveHandle *AH, const void *data, size_t dLen);
static void _EndData(ArchiveHandle *AH, TocEntry *te);
static int _WriteByte(ArchiveHandle *AH, const int i);
static int _ReadByte(ArchiveHandle *);
static void _WriteBuf(ArchiveHandle *AH, const void *buf, size_t len);
static void _ReadBuf(ArchiveHandle *AH, void *buf, size_t len);
static void _CloseArchive(ArchiveHandle *AH);
static void _PrintTocData(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt);
static void _WriteExtraToc(ArchiveHandle *AH, TocEntry *te);
static void _ReadExtraToc(ArchiveHandle *AH, TocEntry *te);
static void _PrintExtraToc(ArchiveHandle *AH, TocEntry *te);
static void _StartBlobs(ArchiveHandle *AH, TocEntry *te);
static void _StartBlob(ArchiveHandle *AH, TocEntry *te, Oid oid);
static void _EndBlob(ArchiveHandle *AH, TocEntry *te, Oid oid);
static void _EndBlobs(ArchiveHandle *AH, TocEntry *te);
#define K_STD_BUF_SIZE 1024
typedef struct
{
#ifdef HAVE_LIBZ
gzFile zFH;
#else
FILE *zFH;
#endif
FILE *nFH;
FILE *tarFH;
FILE *tmpFH;
char *targetFile;
char mode;
pgoff_t pos;
pgoff_t fileLen;
ArchiveHandle *AH;
} TAR_MEMBER;
typedef struct
{
int hasSeek;
pgoff_t filePos;
TAR_MEMBER *blobToc;
FILE *tarFH;
pgoff_t tarFHpos;
pgoff_t tarNextMember;
TAR_MEMBER *FH;
int isSpecialScript;
TAR_MEMBER *scriptTH;
} lclContext;
typedef struct
{
TAR_MEMBER *TH;
char *filename;
} lclTocEntry;
/* translator: this is a module name */
static const char *modulename = gettext_noop("tar archiver");
static void _LoadBlobs(ArchiveHandle *AH, RestoreOptions *ropt);
static TAR_MEMBER *tarOpen(ArchiveHandle *AH, const char *filename, char mode);
static void tarClose(ArchiveHandle *AH, TAR_MEMBER *TH);
#ifdef __NOT_USED__
static char *tarGets(char *buf, size_t len, TAR_MEMBER *th);
#endif
static int tarPrintf(ArchiveHandle *AH, TAR_MEMBER *th, const char *fmt,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
static void _tarAddFile(ArchiveHandle *AH, TAR_MEMBER *th);
static TAR_MEMBER *_tarPositionTo(ArchiveHandle *AH, const char *filename);
static size_t tarRead(void *buf, size_t len, TAR_MEMBER *th);
static size_t tarWrite(const void *buf, size_t len, TAR_MEMBER *th);
static void _tarWriteHeader(TAR_MEMBER *th);
static int _tarGetHeader(ArchiveHandle *AH, TAR_MEMBER *th);
static size_t _tarReadRaw(ArchiveHandle *AH, void *buf, size_t len, TAR_MEMBER *th, FILE *fh);
static size_t _scriptOut(ArchiveHandle *AH, const void *buf, size_t len);
/*
* Initializer
*/
void
InitArchiveFmt_Tar(ArchiveHandle *AH)
{
lclContext *ctx;
/* Assuming static functions, this can be copied for each format. */
AH->ArchiveEntryPtr = _ArchiveEntry;
AH->StartDataPtr = _StartData;
AH->WriteDataPtr = _WriteData;
AH->EndDataPtr = _EndData;
AH->WriteBytePtr = _WriteByte;
AH->ReadBytePtr = _ReadByte;
AH->WriteBufPtr = _WriteBuf;
AH->ReadBufPtr = _ReadBuf;
AH->ClosePtr = _CloseArchive;
AH->ReopenPtr = NULL;
AH->PrintTocDataPtr = _PrintTocData;
AH->ReadExtraTocPtr = _ReadExtraToc;
AH->WriteExtraTocPtr = _WriteExtraToc;
AH->PrintExtraTocPtr = _PrintExtraToc;
AH->StartBlobsPtr = _StartBlobs;
AH->StartBlobPtr = _StartBlob;
AH->EndBlobPtr = _EndBlob;
AH->EndBlobsPtr = _EndBlobs;
AH->ClonePtr = NULL;
AH->DeClonePtr = NULL;
AH->MasterStartParallelItemPtr = NULL;
AH->MasterEndParallelItemPtr = NULL;
AH->WorkerJobDumpPtr = NULL;
AH->WorkerJobRestorePtr = NULL;
/*
* Set up some special context used in compressing data.
*/
ctx = (lclContext *) pg_malloc0(sizeof(lclContext));
AH->formatData = (void *) ctx;
ctx->filePos = 0;
ctx->isSpecialScript = 0;
/* Initialize LO buffering */
AH->lo_buf_size = LOBBUFSIZE;
AH->lo_buf = (void *) pg_malloc(LOBBUFSIZE);
/*
* Now open the tar file, and load the TOC if we're in read mode.
*/
if (AH->mode == archModeWrite)
{
if (AH->fSpec && strcmp(AH->fSpec, "") != 0)
{
ctx->tarFH = fopen(AH->fSpec, PG_BINARY_W);
if (ctx->tarFH == NULL)
exit_horribly(modulename,
"could not open TOC file \"%s\" for output: %s\n",
AH->fSpec, strerror(errno));
}
else
{
ctx->tarFH = stdout;
if (ctx->tarFH == NULL)
exit_horribly(modulename,
"could not open TOC file for output: %s\n",
strerror(errno));
}
ctx->tarFHpos = 0;
/*
* Make unbuffered since we will dup() it, and the buffers screw each
* other
*/
/* setvbuf(ctx->tarFH, NULL, _IONBF, 0); */
ctx->hasSeek = checkSeek(ctx->tarFH);
/*
* We don't support compression because reading the files back is not
* possible since gzdopen uses buffered IO which totally screws file
* positioning.
*/
if (AH->compression != 0)
exit_horribly(modulename,
"compression is not supported by tar archive format\n");
}
else
{ /* Read Mode */
if (AH->fSpec && strcmp(AH->fSpec, "") != 0)
{
ctx->tarFH = fopen(AH->fSpec, PG_BINARY_R);
if (ctx->tarFH == NULL)
exit_horribly(modulename, "could not open TOC file \"%s\" for input: %s\n",
AH->fSpec, strerror(errno));
}
else
{
ctx->tarFH = stdin;
if (ctx->tarFH == NULL)
exit_horribly(modulename, "could not open TOC file for input: %s\n",
strerror(errno));
}
/*
* Make unbuffered since we will dup() it, and the buffers screw each
* other
*/
/* setvbuf(ctx->tarFH, NULL, _IONBF, 0); */
ctx->tarFHpos = 0;
ctx->hasSeek = checkSeek(ctx->tarFH);
/*
* Forcibly unmark the header as read since we use the lookahead
* buffer
*/
AH->readHeader = 0;
ctx->FH = (void *) tarOpen(AH, "toc.dat", 'r');
ReadHead(AH);
ReadToc(AH);
tarClose(AH, ctx->FH); /* Nothing else in the file... */
}
}
/*
* - Start a new TOC entry
* Setup the output file name.
*/
static void
_ArchiveEntry(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *ctx;
char fn[K_STD_BUF_SIZE];
ctx = (lclTocEntry *) pg_malloc0(sizeof(lclTocEntry));
if (te->dataDumper != NULL)
{
#ifdef HAVE_LIBZ
if (AH->compression == 0)
sprintf(fn, "%d.dat", te->dumpId);
else
sprintf(fn, "%d.dat.gz", te->dumpId);
#else
sprintf(fn, "%d.dat", te->dumpId);
#endif
ctx->filename = pg_strdup(fn);
}
else
{
ctx->filename = NULL;
ctx->TH = NULL;
}
te->formatData = (void *) ctx;
}
static void
_WriteExtraToc(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *ctx = (lclTocEntry *) te->formatData;
if (ctx->filename)
WriteStr(AH, ctx->filename);
else
WriteStr(AH, "");
}
static void
_ReadExtraToc(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *ctx = (lclTocEntry *) te->formatData;
if (ctx == NULL)
{
ctx = (lclTocEntry *) pg_malloc0(sizeof(lclTocEntry));
te->formatData = (void *) ctx;
}
ctx->filename = ReadStr(AH);
if (strlen(ctx->filename) == 0)
{
free(ctx->filename);
ctx->filename = NULL;
}
ctx->TH = NULL;
}
static void
_PrintExtraToc(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *ctx = (lclTocEntry *) te->formatData;
if (AH->public.verbose && ctx->filename != NULL)
ahprintf(AH, "-- File: %s\n", ctx->filename);
}
static void
_StartData(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *tctx = (lclTocEntry *) te->formatData;
tctx->TH = tarOpen(AH, tctx->filename, 'w');
}
static TAR_MEMBER *
tarOpen(ArchiveHandle *AH, const char *filename, char mode)
{
lclContext *ctx = (lclContext *) AH->formatData;
TAR_MEMBER *tm;
#ifdef HAVE_LIBZ
char fmode[10];
#endif
if (mode == 'r')
{
tm = _tarPositionTo(AH, filename);
if (!tm) /* Not found */
{
if (filename)
{
/*
* Couldn't find the requested file. Future: do SEEK(0) and
* retry.
*/
exit_horribly(modulename, "could not find file \"%s\" in archive\n", filename);
}
else
{
/* Any file OK, none left, so return NULL */
return NULL;
}
}
#ifdef HAVE_LIBZ
if (AH->compression == 0)
tm->nFH = ctx->tarFH;
else
exit_horribly(modulename, "compression is not supported by tar archive format\n");
/* tm->zFH = gzdopen(dup(fileno(ctx->tarFH)), "rb"); */
#else
tm->nFH = ctx->tarFH;
#endif
}
else
{
int old_umask;
tm = pg_malloc0(sizeof(TAR_MEMBER));
/*
* POSIX does not require, but permits, tmpfile() to restrict file
* permissions. Given an OS crash after we write data, the filesystem
* might retain the data but forget tmpfile()'s unlink(). If so, the
* file mode protects confidentiality of the data written.
*/
old_umask = umask(S_IRWXG | S_IRWXO);
#ifndef WIN32
tm->tmpFH = tmpfile();
#else
/*
* On WIN32, tmpfile() generates a filename in the root directory,
* which requires administrative permissions on certain systems. Loop
* until we find a unique file name we can create.
*/
while (1)
{
char *name;
int fd;
name = _tempnam(NULL, "pg_temp_");
if (name == NULL)
break;
fd = open(name, O_RDWR | O_CREAT | O_EXCL | O_BINARY |
O_TEMPORARY, S_IRUSR | S_IWUSR);
free(name);
if (fd != -1) /* created a file */
{
tm->tmpFH = fdopen(fd, "w+b");
break;
}
else if (errno != EEXIST) /* failure other than file exists */
break;
}
#endif
if (tm->tmpFH == NULL)
exit_horribly(modulename, "could not generate temporary file name: %s\n", strerror(errno));
umask(old_umask);
#ifdef HAVE_LIBZ
if (AH->compression != 0)
{
sprintf(fmode, "wb%d", AH->compression);
tm->zFH = gzdopen(dup(fileno(tm->tmpFH)), fmode);
if (tm->zFH == NULL)
exit_horribly(modulename, "could not open temporary file\n");
}
else
tm->nFH = tm->tmpFH;
#else
tm->nFH = tm->tmpFH;
#endif
tm->AH = AH;
tm->targetFile = pg_strdup(filename);
}
tm->mode = mode;
tm->tarFH = ctx->tarFH;
return tm;
}
static void
tarClose(ArchiveHandle *AH, TAR_MEMBER *th)
{
/*
* Close the GZ file since we dup'd. This will flush the buffers.
*/
if (AH->compression != 0)
if (GZCLOSE(th->zFH) != 0)
exit_horribly(modulename, "could not close tar member\n");
if (th->mode == 'w')
_tarAddFile(AH, th); /* This will close the temp file */
/*
* else Nothing to do for normal read since we don't dup() normal file
* handle, and we don't use temp files.
*/
if (th->targetFile)
free(th->targetFile);
th->nFH = NULL;
th->zFH = NULL;
}
#ifdef __NOT_USED__
static char *
tarGets(char *buf, size_t len, TAR_MEMBER *th)
{
char *s;
size_t cnt = 0;
char c = ' ';
int eof = 0;
/* Can't read past logical EOF */
if (len > (th->fileLen - th->pos))
len = th->fileLen - th->pos;
while (cnt < len && c != '\n')
{
if (_tarReadRaw(th->AH, &c, 1, th, NULL) <= 0)
{
eof = 1;
break;
}
buf[cnt++] = c;
}
if (eof && cnt == 0)
s = NULL;
else
{
buf[cnt++] = '\0';
s = buf;
}
if (s)
{
len = strlen(s);
th->pos += len;
}
return s;
}
#endif
/*
* Just read bytes from the archive. This is the low level read routine
* that is used for ALL reads on a tar file.
*/
static size_t
_tarReadRaw(ArchiveHandle *AH, void *buf, size_t len, TAR_MEMBER *th, FILE *fh)
{
lclContext *ctx = (lclContext *) AH->formatData;
size_t avail;
size_t used = 0;
size_t res = 0;
avail = AH->lookaheadLen - AH->lookaheadPos;
if (avail > 0)
{
/* We have some lookahead bytes to use */
if (avail >= len) /* Just use the lookahead buffer */
used = len;
else
used = avail;
/* Copy, and adjust buffer pos */
memcpy(buf, AH->lookahead + AH->lookaheadPos, used);
AH->lookaheadPos += used;
/* Adjust required length */
len -= used;
}
/* Read the file if len > 0 */
if (len > 0)
{
if (fh)
{
res = fread(&((char *) buf)[used], 1, len, fh);
if (res != len && !feof(fh))
READ_ERROR_EXIT(fh);
}
else if (th)
{
if (th->zFH)
{
res = GZREAD(&((char *) buf)[used], 1, len, th->zFH);
if (res != len && !GZEOF(th->zFH))
{
#ifdef HAVE_LIBZ
int errnum;
const char *errmsg = gzerror(th->zFH, &errnum);
exit_horribly(modulename,
"could not read from input file: %s\n",
errnum == Z_ERRNO ? strerror(errno) : errmsg);
#else
exit_horribly(modulename,
"could not read from input file: %s\n",
strerror(errno));
#endif
}
}
else
{
res = fread(&((char *) buf)[used], 1, len, th->nFH);
if (res != len && !feof(th->nFH))
READ_ERROR_EXIT(th->nFH);
}
}
else
exit_horribly(modulename, "internal error -- neither th nor fh specified in tarReadRaw()\n");
}
ctx->tarFHpos += res + used;
return (res + used);
}
static size_t
tarRead(void *buf, size_t len, TAR_MEMBER *th)
{
size_t res;
if (th->pos + len > th->fileLen)
len = th->fileLen - th->pos;
if (len <= 0)
return 0;
res = _tarReadRaw(th->AH, buf, len, th, NULL);
th->pos += res;
return res;
}
static size_t
tarWrite(const void *buf, size_t len, TAR_MEMBER *th)
{
size_t res;
if (th->zFH != NULL)
res = GZWRITE(buf, 1, len, th->zFH);
else
res = fwrite(buf, 1, len, th->nFH);
th->pos += res;
return res;
}
static void
_WriteData(ArchiveHandle *AH, const void *data, size_t dLen)
{
lclTocEntry *tctx = (lclTocEntry *) AH->currToc->formatData;
if (tarWrite(data, dLen, tctx->TH) != dLen)
WRITE_ERROR_EXIT;
return;
}
static void
_EndData(ArchiveHandle *AH, TocEntry *te)
{
lclTocEntry *tctx = (lclTocEntry *) te->formatData;
/* Close the file */
tarClose(AH, tctx->TH);
tctx->TH = NULL;
}
/*
* Print data for a given file
*/
static void
_PrintFileData(ArchiveHandle *AH, char *filename, RestoreOptions *ropt)
{
lclContext *ctx = (lclContext *) AH->formatData;
char buf[4096];
size_t cnt;
TAR_MEMBER *th;
if (!filename)
return;
th = tarOpen(AH, filename, 'r');
ctx->FH = th;
while ((cnt = tarRead(buf, 4095, th)) > 0)
{
buf[cnt] = '\0';
ahwrite(buf, 1, cnt, AH);
}
tarClose(AH, th);
}
/*
* Print data for a given TOC entry
*/
static void
_PrintTocData(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt)
{
lclContext *ctx = (lclContext *) AH->formatData;
lclTocEntry *tctx = (lclTocEntry *) te->formatData;
int pos1;
if (!tctx->filename)
return;
/*
* If we're writing the special restore.sql script, emit a suitable
* command to include each table's data from the corresponding file.
*
* In the COPY case this is a bit klugy because the regular COPY command
* was already printed before we get control.
*/
if (ctx->isSpecialScript)
{
if (te->copyStmt)
{
/* Abort the COPY FROM stdin */
ahprintf(AH, "\\.\n");
/*
* The COPY statement should look like "COPY ... FROM stdin;\n",
* see dumpTableData().
*/
pos1 = (int) strlen(te->copyStmt) - 13;
if (pos1 < 6 || strncmp(te->copyStmt, "COPY ", 5) != 0 ||
strcmp(te->copyStmt + pos1, " FROM stdin;\n") != 0)
exit_horribly(modulename,
"unexpected COPY statement syntax: \"%s\"\n",
te->copyStmt);
/* Emit all but the FROM part ... */
ahwrite(te->copyStmt, 1, pos1, AH);
/* ... and insert modified FROM */
ahprintf(AH, " FROM '$$PATH$$/%s';\n\n", tctx->filename);
}
else
{
/* --inserts mode, no worries, just include the data file */
ahprintf(AH, "\\i $$PATH$$/%s\n\n", tctx->filename);
}
return;
}
if (strcmp(te->desc, "BLOBS") == 0)
_LoadBlobs(AH, ropt);
else
_PrintFileData(AH, tctx->filename, ropt);
}
static void
_LoadBlobs(ArchiveHandle *AH, RestoreOptions *ropt)
{
Oid oid;
lclContext *ctx = (lclContext *) AH->formatData;
TAR_MEMBER *th;
size_t cnt;
bool foundBlob = false;
char buf[4096];
StartRestoreBlobs(AH);
th = tarOpen(AH, NULL, 'r'); /* Open next file */
while (th != NULL)
{
ctx->FH = th;
if (strncmp(th->targetFile, "blob_", 5) == 0)
{
oid = atooid(&th->targetFile[5]);
if (oid != 0)
{
ahlog(AH, 1, "restoring large object with OID %u\n", oid);
StartRestoreBlob(AH, oid, ropt->dropSchema);
while ((cnt = tarRead(buf, 4095, th)) > 0)
{
buf[cnt] = '\0';
ahwrite(buf, 1, cnt, AH);
}
EndRestoreBlob(AH, oid);
foundBlob = true;
}
tarClose(AH, th);
}
else
{
tarClose(AH, th);
/*
* Once we have found the first blob, stop at the first non-blob
* entry (which will be 'blobs.toc'). This coding would eat all
* the rest of the archive if there are no blobs ... but this
* function shouldn't be called at all in that case.
*/
if (foundBlob)
break;
}
th = tarOpen(AH, NULL, 'r');
}
EndRestoreBlobs(AH);
}
static int
_WriteByte(ArchiveHandle *AH, const int i)
{
lclContext *ctx = (lclContext *) AH->formatData;
char b = i; /* Avoid endian problems */
if (tarWrite(&b, 1, ctx->FH) != 1)
WRITE_ERROR_EXIT;
ctx->filePos += 1;
return 1;
}
static int
_ReadByte(ArchiveHandle *AH)
{
lclContext *ctx = (lclContext *) AH->formatData;
size_t res;
unsigned char c;
res = tarRead(&c, 1, ctx->FH);
if (res != 1)
/* We already would have exited for errors on reads, must be EOF */
exit_horribly(modulename,
"could not read from input file: end of file\n");
ctx->filePos += 1;
return c;
}
static void
_WriteBuf(ArchiveHandle *AH, const void *buf, size_t len)
{
lclContext *ctx = (lclContext *) AH->formatData;
if (tarWrite(buf, len, ctx->FH) != len)
WRITE_ERROR_EXIT;
ctx->filePos += len;
}
static void
_ReadBuf(ArchiveHandle *AH, void *buf, size_t len)
{
lclContext *ctx = (lclContext *) AH->formatData;
if (tarRead(buf, len, ctx->FH) != len)
/* We already would have exited for errors on reads, must be EOF */
exit_horribly(modulename,
"could not read from input file: end of file\n");
ctx->filePos += len;
return;
}
static void
_CloseArchive(ArchiveHandle *AH)
{
lclContext *ctx = (lclContext *) AH->formatData;
TAR_MEMBER *th;
RestoreOptions *ropt;
RestoreOptions *savRopt;
int savVerbose,
i;
if (AH->mode == archModeWrite)
{
/*
* Write the Header & TOC to the archive FIRST
*/
th = tarOpen(AH, "toc.dat", 'w');
ctx->FH = th;
WriteHead(AH);
WriteToc(AH);
tarClose(AH, th); /* Not needed any more */
/*
* Now send the data (tables & blobs)
*/
WriteDataChunks(AH, NULL);
/*
* Now this format wants to append a script which does a full restore
* if the files have been extracted.
*/
th = tarOpen(AH, "restore.sql", 'w');
tarPrintf(AH, th, "--\n"
"-- NOTE:\n"
"--\n"
"-- File paths need to be edited. Search for $$PATH$$ and\n"
"-- replace it with the path to the directory containing\n"
"-- the extracted data files.\n"
"--\n");
AH->CustomOutPtr = _scriptOut;
ctx->isSpecialScript = 1;
ctx->scriptTH = th;
ropt = NewRestoreOptions();
memcpy(ropt, AH->ropt, sizeof(RestoreOptions));
ropt->filename = NULL;
ropt->dropSchema = 1;
ropt->compression = 0;
ropt->superuser = NULL;
ropt->suppressDumpWarnings = true;
savRopt = AH->ropt;
AH->ropt = ropt;
savVerbose = AH->public.verbose;
AH->public.verbose = 0;
RestoreArchive((Archive *) AH);
AH->ropt = savRopt;
AH->public.verbose = savVerbose;
tarClose(AH, th);
ctx->isSpecialScript = 0;
/*
* EOF marker for tar files is two blocks of NULLs.
*/
for (i = 0; i < 512 * 2; i++)
{
if (fputc(0, ctx->tarFH) == EOF)
WRITE_ERROR_EXIT;
}
}
AH->FH = NULL;
}
static size_t
_scriptOut(ArchiveHandle *AH, const void *buf, size_t len)
{
lclContext *ctx = (lclContext *) AH->formatData;
return tarWrite(buf, len, ctx->scriptTH);
}
/*
* BLOB support
*/
/*
* Called by the archiver when starting to save all BLOB DATA (not schema).
* This routine should save whatever format-specific information is needed
* to read the BLOBs back into memory.
*
* It is called just prior to the dumper's DataDumper routine.
*
* Optional, but strongly recommended.
*
*/
static void
_StartBlobs(ArchiveHandle *AH, TocEntry *te)
{
lclContext *ctx = (lclContext *) AH->formatData;
char fname[K_STD_BUF_SIZE];
sprintf(fname, "blobs.toc");
ctx->blobToc = tarOpen(AH, fname, 'w');
}
/*
* Called by the archiver when the dumper calls StartBlob.
*
* Mandatory.
*
* Must save the passed OID for retrieval at restore-time.
*/
static void
_StartBlob(ArchiveHandle *AH, TocEntry *te, Oid oid)
{
lclContext *ctx = (lclContext *) AH->formatData;
lclTocEntry *tctx = (lclTocEntry *) te->formatData;
char fname[255];
char *sfx;
if (oid == 0)
exit_horribly(modulename, "invalid OID for large object (%u)\n", oid);
if (AH->compression != 0)
sfx = ".gz";
else
sfx = "";
sprintf(fname, "blob_%u.dat%s", oid, sfx);
tarPrintf(AH, ctx->blobToc, "%u %s\n", oid, fname);
tctx->TH = tarOpen(AH, fname, 'w');
}
/*
* Called by the archiver when the dumper calls EndBlob.
*
* Optional.
*
*/
static void
_EndBlob(ArchiveHandle *AH, TocEntry *te, Oid oid)
{
lclTocEntry *tctx = (lclTocEntry *) te->formatData;
tarClose(AH, tctx->TH);
}
/*
* Called by the archiver when finishing saving all BLOB DATA.
*
* Optional.
*