Re: [Bug-tar] Tar --verify causes next tar command to overwrite filemark

[Sergey Poznyakoff]

Andrew Klaassen <address@hidden> ha escrit:

> 'tar cWf' leaves the tape in a different position than
> 'tar cf' does.  Compare the expected behaviour to the

Could you test the following patch, please? It is made against CVS
and should apply to v.19 cleanly.

Regards,
Sergey

Index: src/compare.c
===================================================================
RCS file: /cvsroot/tar/tar/src/compare.c,v
retrieving revision 1.40
diff -p -u -r1.40 compare.c
--- src/compare.c       26 Aug 2007 09:01:08 -0000      1.40
+++ src/compare.c       11 Dec 2007 15:55:20 -0000
@@ -597,9 +597,20 @@ verify_volume (void)
                            "VERIFY FAILURE: %d invalid headers detected",
                            counter), counter));
        }
-      if (status == HEADER_ZERO_BLOCK || status == HEADER_END_OF_FILE)
+      if (status == HEADER_END_OF_FILE)
        break;
-
+      if (status == HEADER_ZERO_BLOCK)
+       {
+         char buf[UINTMAX_STRSIZE_BOUND];
+         
+         set_next_block_after (current_header);
+         status = read_header (false);
+         if (status == HEADER_ZERO_BLOCK)
+           break;
+         WARN ((0, 0, _("A lone zero block at %s"),
+                STRINGIFY_BIGINT (current_block_ordinal (), buf)));
+       }
+      
       diff_archive ();
       tar_stat_destroy (&current_stat_info);
     }