On 10/17/2018 06:13 PM, 'awokd' via qubes-users wrote:
Kelly Dean wrote on 10/17/18 6:00 PM:
On Qubes 4.0, I did a full backup to an external hard drive using the
standard backup utility, which completed successfully. 225GB total,
compressed 130GB, took about 12 hours.
Then I tried to verify it (restore with verify-only option), and
watched it for a few minutes to make sure it was running ok, then left
it alone. Last line in the message window at the time was:
Extracting data: 209.6 GiB to restore
Came back a few hours later and the next line was:
Finished with errors!
And there was a dialog box:
[Dom0] Backup error!
ERROR: failed to decrypt
/var/tmp/restorexnuw0a8p/vm31/private.img.034.enc: b'scrypt:
Decrypting file would take too much CPU time\n'
Partially restored files left in /var/tmp/restore_*, investigate them
and/or clean them up
OK
So now I don't know if I have a good backup. The error message also
leaves me doubtful that I'd be able to restore the backup even if it
is good.
The indicated file doesn't exist in dom0. Neither does any other
/var/tmp/restore* file. Googling the message (Decrypting file would
take too much CPU time) finds nothing.
Looks like that error string comes from scrypt. There is a command line
option (-f) to scrypt that forces it to proceed even if it might take
excessive memory or CPU time, but I'm not sure how to pass it on through
qubes-backup-restore.
Looking at the scrypt source, this error code results from the estimated
number of operations exceeding a max time limit. Using -f should
override this check.
In restore.py the function 'def launch_scrypt' contains the line
starting with:
command_line = ['scrypt', action, input_name
This could be changed to:
command_line = ['scrypt', action, '-f', input_name
Of course, this advice is offered "at your own risk" and a backup copy
of restore.py should be made before doing any modification.
-
BTW, since your backups are rather large, you might be interested in a
new backup tool I'm writing that can perform fast incremental backups
even on large volumes:
https://github.com/tasket/sparsebak
Its still experimental but could be in beta as soon as December.
--
Chris Laprise, tas...@posteo.net
https://github.com/tasket
https://twitter.com/ttaskett
PGP: BEE2 20C5 356E 764A 73EB 4AB3 1DC4 D106 F07F 1886
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