mirror of https://github.com/postgres/postgres
Make sure the pg_dump tar archiver can handle members larger than 2 GB, but
does not create members larger than allowed by the tar format. Also, fix the generation of the tar header to conform to POSIX.
This commit is contained in:
Peter Eisentraut
parent
172f9a49e0
commit
38e444aae6
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@ -1,5 +1,5 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.49 2002/08/27 18:57:26 petere Exp $
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.50 2002/09/06 21:58:36 petere Exp $
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PostgreSQL documentation
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-->
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@ -662,6 +662,15 @@ CREATE DATABASE foo WITH TEMPLATE = template0;
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</itemizedlist>
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</para>
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<para>
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Members of tar archives are limited to a size less than 8 GB.
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(This is an inherent limitation of the tar file format.) Therefore
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this format cannot be used if the textual representation of a table
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exceeds that size. The total size of a tar archive and any of the
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other output formats is not limited, except possibly by the
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operating system.
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</para>
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</refsect1>
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<refsect1 id="pg-dump-examples">
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@ -16,7 +16,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_tar.c,v 1.28 2002/09/04 20:31:34 momjian Exp $
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* $Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_tar.c,v 1.29 2002/09/06 21:58:36 petere Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -73,6 +73,17 @@ typedef struct
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ArchiveHandle *AH;
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} TAR_MEMBER;
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/*
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* Maximum file size for a tar member: The limit inherent in the
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* format is 2^33-1 bytes (nearly 8 GB). But we don't want to exceed
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* what we can represent by an off_t.
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*/
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#ifdef INT64_IS_BUSTED
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#define MAX_TAR_MEMBER_FILELEN INT_MAX
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#else
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#define MAX_TAR_MEMBER_FILELEN (((int64) 1 << Min(33, sizeof(off_t)*8 - 1)) - 1)
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#endif
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typedef struct
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{
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int hasSeek;
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@ -1006,6 +1017,8 @@ _tarAddFile(ArchiveHandle *AH, TAR_MEMBER *th)
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*/
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fseeko(tmp, 0, SEEK_END);
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th->fileLen = ftello(tmp);
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if (th->fileLen > MAX_TAR_MEMBER_FILELEN)
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die_horribly(AH, modulename, "archive member too large for tar format\n");
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fseeko(tmp, 0, SEEK_SET);
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_tarWriteHeader(th);
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@ -1219,6 +1232,23 @@ _tarGetHeader(ArchiveHandle *AH, TAR_MEMBER *th)
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return 1;
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}
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/*
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* Utility routine to print possibly larger than 32 bit integers in a
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* portable fashion. Filled with zeros.
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*/
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static void print_val(char *s, uint64 val, unsigned int base, size_t len)
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{
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int i;
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for (i = len; i > 0; i--)
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{
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int digit = val % base;
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s[i - 1] = '0' + digit;
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val = val / base;
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}
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}
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static void
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_tarWriteHeader(TAR_MEMBER *th)
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{
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@ -1235,34 +1265,30 @@ _tarWriteHeader(TAR_MEMBER *th)
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sprintf(&h[100], "100600 ");
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/* User ID 8 */
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sprintf(&h[108], " 04000 ");
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sprintf(&h[108], "004000 ");
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/* Group 8 */
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sprintf(&h[116], " 02000 ");
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sprintf(&h[116], "002000 ");
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/* File size 12 */
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/* FIXME: This goes only up to 2^30. -- What about larger files? */
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sprintf(&h[124], "%10o ", (unsigned int) th->fileLen);
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/* File size 12 - 11 digits, 1 space, no NUL */
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print_val(&h[124], th->fileLen, 8, 11);
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sprintf(&h[135], " ");
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/* Mod Time 12 */
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sprintf(&h[136], "%10o ", (int) time(NULL));
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sprintf(&h[136], "%011o ", (int) time(NULL));
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/* Checksum 8 */
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sprintf(&h[148], "%6o ", lastSum);
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sprintf(&h[148], "%06o ", lastSum);
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/* Type 1 */
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/* sprintf(&h[156], "%c", LF_NORMAL); */
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/* Type - regular file */
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sprintf(&h[156], "0");
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/* Link tag 100 (NULL) */
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/* Magic 8 */
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sprintf(&h[257], "ustar ");
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/*
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* GNU Version... sprintf(&h[257], "ustar"); sprintf(&h[263], "00");
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*/
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/* Magic 6 + Version 2 */
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sprintf(&h[257], "ustar00");
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#if 0
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/* User 32 */
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sprintf(&h[265], "%.31s", ""); /* How do I get username reliably?
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* Do I need to? */
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@ -1272,15 +1298,15 @@ _tarWriteHeader(TAR_MEMBER *th)
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* I need to? */
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/* Maj Dev 8 */
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/* sprintf(&h[329], "%6o ", 0); */
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/* Min Dev */
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/* sprintf(&h[337], "%6o ", 0); */
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sprintf(&h[329], "%6o ", 0);
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/* Min Dev 8 */
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sprintf(&h[337], "%6o ", 0);
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#endif
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while ((sum = _tarChecksum(h)) != lastSum)
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{
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sprintf(&h[148], "%6o ", sum);
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sprintf(&h[148], "%06o ", sum);
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lastSum = sum;
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}
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