Using GPG to encrypt tape backups

[Carl Litt]

Yeah, I guess that would work.  Missed it in the man page.

Regardless, I am still not getting proper backups to the tape.  I
get this error at the end of the backup:

gpg: /dev/nst0: write error: Invalid argument
gpg: iobuf_flush failed on close: file write error

I get this regardless of whether I use -o /dev/nst0 or whether I redirect 
stdout to /dev/nst0.  When trying to verify the backup I get this:

gpg: block_filter 0x80e2a28: read error (size=12118,a->size=12118)
gpg: block_filter: pending bytes!

It appears that GPG can't close the output file descriptor properly when 
it's a tape device.  Shouldn't I be able to use GPG as a pipe filter
in this manner?

Carl


On Mon, 5 Aug 2002, Steve Butler wrote:

> Did you try the --yes option with --batch?
> 
> -----Original Message-----
> From: Carl Litt [mailto:litt@execulink.com]
> Sent: Friday, August 02, 2002 5:02 PM
> To: gnupg-users@gnupg.org
> Subject: Using GPG to encrypt tape backups
> 
> 
> I'm trying to use GPG as a filter to encrypt my tape backups:
> 
> tar cf - backup | gpg -e -r myID -z 9 -o /dev/nst0
> 
> The problem is that GPG wants to prompt because /dev/nst0 exists.
> If I answer "y" it works fine, but I'm trying to automate this.  If I use
> --batch, it complains about the existing file and aborts.
> 
> I have also tried without the output option, instead redirecting
> stdout to /dev/nst0, but I get "write error: Invalid argument" errors.
> I even tried piping gpg to dd of=/dev/nst0 bs=512, but no go either.
> 
> It does't seem to be possible to use gpg as a filter in this manner.
> Does anyone have any ideas?  I would like to see an option to
> overwrite the output file, but chances are slim that will be done.
> Creating a temporary file and dumping that is not an option.
> 
> Thanks,
> 
> Carl Litt
> Network Administrator
> Execulink Internet
> 
> 
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