Re: [Duplicity-talk] Verify is not working as expected, for me

[David Williams]

On 06/10/2017 05:45 AM, Kenneth Loafman wrote:
> Hi David,
>
> You are correct, verify by itself only verifies that the current 
> backup can be recovered.  With --data-compare, it will also compare 
> the backup's data against that on the file system.  This is to save 
> time since the compare operation is expensive.
>
> ...Thanks,
> ...Ken

OK, thanks. Pretty confusing since the current behavior, in 7.12, is 
contrary to examples [1] I've seen.

In addition to the behavior of "rsync" [2] which " ... finds files that 
need to be transferred using a "quick check" algorithm (by default) that 
looks for files that have changed in size or in last-modified time."

I was going to open a bug to improve the man page docs for 'verify' but 
then saw a lot had already been opened and apparently resolved (or, in 
progress?). Such as bug 1354880 [3]. I will point out, though, that the 
"man page" changes mentioned in that bug 1354880 do not seem to be in 
version 7.12, unless I have the wrong man pages installed, somehow. I 
did install the Ubuntu 16.04 "distribution version" first, which is 
quite old, at the 7.06 level and did try to 'purge' the old version 
before installing the new 7.12 version, but, you know, I might have made 
some mistake and I have not checked the source repository.

Thank you so much for clarifying!


[1] https://help.ubuntu.com/community/DuplicityBackupHowto#Verify
[2] http://manpages.ubuntu.com/manpages/trusty/man1/rsync.1.html
[3] https://bugs.launchpad.net/duplicity/+bug/1354880