Re: [Monotone-devel] file-system archaeology

[hendrik]

On Tue, Apr 28, 2009 at 01:44:56PM -0700, Zack Weinberg wrote:
> On Tue, Apr 28, 2009 at 1:35 PM, Zack Weinberg <address@hidden> wrote:
> > On Tue, Apr 28, 2009 at 1:11 PM,  <address@hidden> wrote:
> >> I'm doing some file-system archaeology again, and I've found a monotone
> >> data base with no branches.  It's 311296 bytes long, so it's unlikely to
> >> be empty.  Yet,
> >>
> >> address@hidden:~/monotone$ mtn list branches --db w.db
> >> address@hidden:~/monotone$
> >
> > This should give you all head revision IDs, despite the absence of branches:
> >
> > $ mtn -d w.db execute 'select hex(id) from revisions' | tail -n +3 |
> > mtn -d w.db au erase_ancestors -@ -
> 
> That's "mtn -d w.db db execute", of course.  *headdesk*
> 
> This might also be interesting:
> 
> $ mtn -d w.db db execute 'select hex(id),keypair,name,value from
> revision_certs order by id,name' | less
> 
> zw

Just tried something else:

address@hidden:~/monotone$ mtn db init --db=onion.db
address@hidden:~/monotone$ ls -l onion.db
-rw-r--r-- 1 hendrik sbox 311296 2009-04-28 17:12 onion.db
address@hidden:~/monotone$ 

So it looks very mich as if those other 311296-byte data bases are 
indeed *empty* data bases!  Indeed, comparing it with the mystery w.db, 

address@hidden:~/monotone$ diff onion.db w.db
address@hidden:~/monotone$ 

What a surprise!  311296 bytes of nothing.

Yet I have another data base from even darker dark ages, which I 
first had to upgrade with mtn upgrade and mtn rosterify.  It gives me:
 
address@hidden:~/monotone$ ls -l database.db
-rw-r--r-- 1 hendrik sbox 46080 2009-04-28 16:09 database.db
address@hidden:~/monotone$ mtn list branches --db=database.db
com.pooq.topoi.sandbox
address@hidden:~/monotone$ 

This one is smaller -- only 46080 bytes -- and has something in it.

I wonder what all that overhead is doing.

-- hendrik