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

[Andrew Klaassen]

'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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