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

[Andrew Klaassen]

Here's a slightly clearer test (with tar 1.19) to show
what's going on:

# touch foo
# mt rewind
# ./tar cf /dev/nst0 foo
# mt status | grep '^File'
File number=1, block number=0, partition=0.
# mt rewind
# ./tar cWf /dev/nst0 foo
# mt status | grep '^File'
File number=0, block number=1, partition=0.

A 'tar cf' leaves the tape on the first block of the
next file number.  A 'tar cWf' leaves the tape on the
last block of the current file number.

By design, or a bug?

Thanks.

Andrew Klaassen


--- Andrew Klaassen <address@hidden> wrote:

> 'tar cWf' leaves the tape in a different position
> than
> 'tar cf' does.  Compare the expected behaviour to
> the
> unexpected behaviour:
> 
> Expected behaviour:
> 
> # mt -t /dev/nst0 rewind
> # tar cvf /dev/nst0 foo
> foo
> # tar cvf /dev/nst0 bar
> bar
> # tar cvf /dev/nst0 baz
> baz
> # mt -t /dev/nst0 asf 0; tar tf /dev/nst0
> foo
> # mt -t /dev/nst0 asf 1; tar tf /dev/nst0
> bar
> # mt -t /dev/nst0 asf 2; tar tf /dev/nst0
> baz
> 
> Unexpected behaviour:
> 
> # mt -t /dev/nst0 rewind
> # tar cvWf /dev/nst0 foo
> foo
> Verify foo
> # tar cvWf /dev/nst0 bar
> bar
> Verify foo
> # tar cvWf /dev/nst0 baz
> baz
> Verify foo
> # mt -t /dev/nst0 asf 0; tar tf /dev/nst0
> foo
> # mt -t /dev/nst0 asf 1; tar tf /dev/nst0
> # mt -t /dev/nst0 asf 2; tar tf /dev/nst0
> /dev/nst0: Input/output error
> tar: /dev/nst0: Cannot read: Input/output error
> tar: At beginning of tape, quitting now
> tar: Error is not recoverable: exiting now
> 
> Is this behaviour by design, or is it a bug?
> 
> If it's a bug, is there a fix?
> 
> Thanks.
> 
> Andrew Klaassen
> 
> 
> 
> 
>      
>
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