From: Sverre Rabbelier <srabbelier@gmail.com>
Date: Thu, 07 Oct 2010 13:58:02 GMT
Subject: Re: [PATCH] fast-import: Allow filemodify to set the root
Message-ID: <AANLkTikjzQ09XBxYZXXQf6XCme3FiLKtusZ0MLTa--mM@mail.gmail.com>
In-Reply-To: <1286448906-1424-1-git-send-email-david.barr@cordelta.com>

Heya,

On Thu, Oct 7, 2010 at 12:55, David Barr <david.barr@cordelta.com> wrote:
> Most git commands do their writing to the object db via the index and
> loose objects.  When you just have a pile of trees you want to convert
> into commits, this is wasteful; for performance-critical operations
> like filter-branch --subdirectory-filter, one might want a sort of
> hash-object --batch-to-pack to write a pack directly.

This means nothing to me, but perhaps I'm not the target audience of
this paragraph.

> Fortunately we have fast-import (which is one of the only git commands
> that will write to a pack directly) but there is not an advertised way
> to tell fast-import to use a given tree for its commits.

I'm with you up to "use a given tree for its commits".

> This patch changes that, by allowing
>
>        M 040000 <tree id> ""
>
> as a filemodify line in a commit to reset to a particular tree without
> any need to unpack it.  For example,
>
>        M 040000 4b825dc642cb6eb9a060e54bf8d69288fbee4904 ""
>
> is a synonym for the deleteall command.

Ok, so maybe I do understand, is it basically 'git read-tree
4b825dc642cb6eb9a060e54bf8d69288fbee4904' for fast-import?

-- 
Cheers,

Sverre Rabbelier