Re: btrfs recovery

[Duncan <1i5t5.duncan@cox.net>]

Austin S. Hemmelgarn posted on Tue, 31 Jan 2017 07:45:42 -0500 as
excerpted:

>> There's actually a btrfs-undelete script on github that turns the
>> otherwise multiple manual steps into a nice, smooth, undelete
>> operation. Or at least it's supposed to.  I've never actually used it,
>> tho I have examined the script out of curiosity to see what it did and
>> how, and it /looks/ like it should work.  I've kept that trick (and
>> knowledge of where to look for the script) filed away in the back of
>> my head in case I need it someday. =:^)

> I've not used the script itself before, but I've used the method before
> on a couple of occasions to pull out old versions of files that I should
> have had under some kind of VCS but didn't, and the method does work
> reliably as long as you do it soon.

>From reading the script, the two potentially difficult steps the script 
helpfully automates for you are...

1) going thru the roots find-root has found to find a good one to use

... and...

2) the fiddly regex escaping, so you don't have to pay too much attention 
to that, just feed it a normal path.

IOW, it should be a great help to users that don't know btrfs command or 
filesystem internals very well, and/or who don't find regex use 
particularly easy.

IOW, it'd be an excellent tool to either include in btrfs-tools as-is or 
C-codify and add as a btrfs subcommand, at some point as btrfs nears true 
stability and readiness for for ordinary less technical users.

-- 
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