btrfs subvolume diff

btrfs subvolume diff

[Thomas Koch]

Hi,

for incremental backups it would be useful to know the files that changed 
between two snapshots. I found a paper about such a tool[1] that adds the 
"btrfs subvolue diff" command, but it's not yet implemented in btrfs-tools in 
Debian Jessie.

Is it in Git? Or somewhere else?

[1] https://www.kernel.org/doc/ols/2014/ols2014-pimpale.pdf

Regards, Thomas Koch

Re: btrfs subvolume diff

[Duncan]

Thomas Koch posted on Wed, 22 Apr 2015 18:08:30 +0200 as excerpted:

> for incremental backups it would be useful to know the files that
> changed between two snapshots. I found a paper about such a tool[1] that
> adds the "btrfs subvolue diff" command, but it's not yet implemented in
> btrfs-tools in Debian Jessie.
> 
> Is it in Git? Or somewhere else?
> 
> [1] https://www.kernel.org/doc/ols/2014/ols2014-pimpale.pdf

[Note that I'm just a btrfs user and list regular, not a dev, and that my 
own use-case doesn't involve subvolumes, tho I played with them a bit 
when I first got into btrfs, so my practical subvolume management 
knowledge is limited.  But based on current git's manpages...]

The closest thing in git-master, based on my build from a few days ago, 
is btrfs subvolume find-new.  That lists the recently modified files 
since <generation>, where generation is fed to the command, with a 
subvolume's current generation obtainable btrfs subvolume list using its
-g option.  (btrfs subvolume show might also list current gen, the manpage 
is vague on what information it shows, and without local subvolumes to 
test it with...)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: btrfs subvolume diff

[Marc MERLIN]

On Thu, Apr 23, 2015 at 03:43:35AM +0000, Duncan wrote:
> Thomas Koch posted on Wed, 22 Apr 2015 18:08:30 +0200 as excerpted:
> 
> > for incremental backups it would be useful to know the files that
> > changed between two snapshots. I found a paper about such a tool[1] that
> > adds the "btrfs subvolue diff" command, but it's not yet implemented in
> > btrfs-tools in Debian Jessie.
> > 
> > Is it in Git? Or somewhere else?
> > 
> > [1] https://www.kernel.org/doc/ols/2014/ols2014-pimpale.pdf
> 
> [Note that I'm just a btrfs user and list regular, not a dev, and that my 
> own use-case doesn't involve subvolumes, tho I played with them a bit 
> when I first got into btrfs, so my practical subvolume management 
> knowledge is limited.  But based on current git's manpages...]

Not a great answer but better than nothing:
http://marc.merlins.org/perso/btrfs/2014-05.html#Btrfs-diff-Between-Snapshots

(based on find-new)

Marc
-- 
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Home page: http://marc.merlins.org/                         | PGP 1024R/763BE901