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Re: Another question about importing SVN with fast-import

From
Shawn O. Pearce <spearce@spearce.org>
Date
Jul 17, 2007, 03:38 UTC
Message-ID
<20070717033840.GK32566@spearce.org>
In-Reply-To
<Pine.LNX.4.64.0707162204480.14971@reaper.quantumfyre.co.uk>
Julian Phillips <julian@quantumfyre.co.uk> wrote:
> First off, I would just like to say fast-import rocks.  It's well named 
> too ...
I'm glad you like it.  ;-)
 
> Now the question.  Shawn recently added C and R operations - almost as 
> soon as they were asked for too.
Sometimes I'm responsive...
> However, how do you copy a file from a 
> particular revision?

and sometimes not so much. You can't do that right now. I've wanted to open up the data subcommand to allow another form that lets you specify data from a branch and file path (thus selecting a blob from another revision) but I haven't gotten around to it. I also don't have time to do it during the earlier part of this week. Maybe I'll get to it later near the end of the week.

It shouldn't be too difficult now with the tree_content_get() function that I recently defined for the C/R commands. The SHA-1 comes back in the tree_entry leaf, but that codepath is only valid for the tip of a branch that fast-import knows about in memory. If it doesn't then you probably need to fallback into raw tree parsing. Ugh.

The way prior frontends have handled this is they assigned marks to every blob, and then had a translation table within the frontend of revision->mark, so that anytime it needed a given revision of a file it knew what mark to send to fast-import. This does require that the frontend maintain basically everything...

Show 5 quoted lines
> I have just hit a point where someone deleted a 
> directory, and then copied one of the files from that directory back from 
> an old revision (as two separate commits).  Since I'm not tracking any 
> branch contents in my front-end, and the copy operation only works from 
> the current branch head I seem to be stuck ... or have I missed something?

Yea, I got nothing. I can't think of any method to make that work aside from using marks. Or teaching fast-import how to do tree lookup, like I described above.

-- 
Shawn.
Previous: Julian PhillipsNext: Julian Phillips
Message 2 of 11 in “Another question about importing SVN with fast-import”
  1. Julian PhillipsJul 16, 2007
  2. Shawn O. PearceJul 17, 2007
  3. Julian PhillipsAug 6, 2007
  4. Shawn O. PearceAug 7, 2007
  5. David FrechJul 19, 2007
  6. Shawn O. PearceJul 20, 2007
  7. Julian PhillipsJul 20, 2007
  8. David FrechJul 20, 2007
  9. Julian PhillipsJul 20, 2007
  10. David FrechJul 20, 2007
  11. Jan HudecJul 23, 2007

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