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Commit411febd

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Ensure write failure reports no-disk-space
A few places calling fwrite and gzwrite were not setting errno to ENOSPCwhen reporting errors, as is customary; this led to some failures beingreported as"could not write file: Success"which makes us look silly. Make a few of these places in pg_dump andpg_basebackup use our customary pattern.Backpatch-to: 9.5Author: Justin Pryzby <pryzby@telsasoft.com>Author: Tom Lane <tgl@sss.pgh.pa.us>Author: Álvaro Herrera <alvherre@alvh.no-ip.org>Discussion:https://postgr.es/m/20200611153753.GU14879@telsasoft.com
1 parent91e27a3 commit411febd

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2 files changed

+30
-1
lines changed

2 files changed

+30
-1
lines changed

‎src/bin/pg_basebackup/pg_basebackup.c‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -902,8 +902,12 @@ writeTarData(
902902
#ifdefHAVE_LIBZ
903903
if (ztarfile!=NULL)
904904
{
905+
errno=0;
905906
if (gzwrite(ztarfile,buf,r)!=r)
906907
{
908+
/* if write didn't set errno, assume problem is no disk space */
909+
if (errno==0)
910+
errno=ENOSPC;
907911
fprintf(stderr,
908912
_("%s: could not write to compressed file \"%s\": %s\n"),
909913
progname,current_file,get_gz_error(ztarfile));
@@ -913,8 +917,12 @@ writeTarData(
913917
else
914918
#endif
915919
{
920+
errno=0;
916921
if (fwrite(buf,r,1,tarfile)!=1)
917922
{
923+
/* if write didn't set errno, assume problem is no disk space */
924+
if (errno==0)
925+
errno=ENOSPC;
918926
fprintf(stderr,_("%s: could not write to file \"%s\": %s\n"),
919927
progname,current_file,strerror(errno));
920928
disconnect_and_exit(1);
@@ -1526,8 +1534,12 @@ ReceiveAndUnpackTarFile(PGconn *conn, PGresult *res, int rownum)
15261534
continue;
15271535
}
15281536

1537+
errno=0;
15291538
if (fwrite(copybuf,r,1,file)!=1)
15301539
{
1540+
/* if write didn't set errno, assume problem is no disk space */
1541+
if (errno==0)
1542+
errno=ENOSPC;
15311543
fprintf(stderr,_("%s: could not write to file \"%s\": %s\n"),
15321544
progname,filename,strerror(errno));
15331545
disconnect_and_exit(1);

‎src/bin/pg_dump/pg_backup_directory.c‎

Lines changed: 18 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -351,10 +351,15 @@ _WriteData(ArchiveHandle *AH, const void *data, size_t dLen)
351351
{
352352
lclContext*ctx= (lclContext*)AH->formatData;
353353

354+
errno=0;
354355
if (dLen>0&&cfwrite(data,dLen,ctx->dataFH)!=dLen)
356+
{
357+
/* if write didn't set errno, assume problem is no disk space */
358+
if (errno==0)
359+
errno=ENOSPC;
355360
exit_horribly(modulename,"could not write to output file: %s\n",
356361
get_cfp_error(ctx->dataFH));
357-
362+
}
358363

359364
return;
360365
}
@@ -491,9 +496,15 @@ _WriteByte(ArchiveHandle *AH, const int i)
491496
unsignedcharc= (unsignedchar)i;
492497
lclContext*ctx= (lclContext*)AH->formatData;
493498

499+
errno=0;
494500
if (cfwrite(&c,1,ctx->dataFH)!=1)
501+
{
502+
/* if write didn't set errno, assume problem is no disk space */
503+
if (errno==0)
504+
errno=ENOSPC;
495505
exit_horribly(modulename,"could not write to output file: %s\n",
496506
get_cfp_error(ctx->dataFH));
507+
}
497508

498509
return1;
499510
}
@@ -521,9 +532,15 @@ _WriteBuf(ArchiveHandle *AH, const void *buf, size_t len)
521532
{
522533
lclContext*ctx= (lclContext*)AH->formatData;
523534

535+
errno=0;
524536
if (cfwrite(buf,len,ctx->dataFH)!=len)
537+
{
538+
/* if write didn't set errno, assume problem is no disk space */
539+
if (errno==0)
540+
errno=ENOSPC;
525541
exit_horribly(modulename,"could not write to output file: %s\n",
526542
get_cfp_error(ctx->dataFH));
543+
}
527544

528545
return;
529546
}

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