[Cialug] Tar file corruption

[Scott Yates]

I don't know if this will help, but they have a  free version you might try:

http://www.datanumen.com/atr/

And wow, 6 hours BEFORE epoch?  I thought the time/date stamp was an
unsigned 32bit value.


On Tue, Apr 30, 2013 at 1:51 PM, David Bierce <david at bierce.org> wrote:

> I tried extracting using --ignore-failed-read and --ignore-zero (as tar
> reads zeros as an EOF) but after it extracts the first part of the file and
> gets to the empty sections (where the bad blocks were zeroed out) and it t
> starts to throw errors and uncompress lots of garbage when it finally gets
> back to data.
>
> I do get some files like this.
>
> Like this
>
> mnt/wine/drive_c/windows/system32/d3d9.dll
> mnt/wine/drive_c/windows/mono/mono-2.0/lib/mono/2.0/culevel.exe
> mnt/wine/drive_c/windows/mono/mono-2.0/lib/mono/2.0/gacutil.exe
> tar: Skipping to next header
> tar: Archive base-256 value is out of off_t range
> tar: Archive value -1099511627776 is out of mode_t range
> 0..18446744073709551615
> \031 at A\377\377\377\377
> tar: \031 at A\377\377\377\377: Unknown file type `z', extracted as normal
> file
> tar: @A????: implausibly old time stamp 1969-12-31 18:00:00
> tar: Skipping to next header
>
>
> Which then fills the rest of the drive with invalid hardlinks with fun and
> exciting names like ?@A???? and B???C????y??0??) with a time stamp of 6
> hours before epoch.
>
>
> On Apr 30, 2013, at 1:11 PM, Tom Pohl wrote:
>
> > Have you tried the tar option --ignore-failed-read? I think that is the
> option that will try to skip past corruption and carry on.
> >
> > Thanks!
> > -Tom
> >
> > On Apr 30, 2013, at 10:58 AM, David Bierce wrote:
> >
> >> I have a tar file that was bzip2 compressed and had a few blocks to bad
> in media transfer, After pulling out the bad blocks, the reconstituted tar
> file appears to only function until the place in the file where the first
> block was corrupted.  After the first block it just doesn't read the rest
> of the data.  I've tried to read the file ignoring zero data, which just
> pulls a bunch of junk metadata and file names after the empty block.  I've
> tried to extract it using CPIO, which has the same problem after the empty
> block.
> >>
> >> Does anyone know of a tool that can repair tar files, or at least, try.
>  Or it is time time to go digging deep into the file or give up :)
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