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From: Jonathan Nieder <jrnieder@gmail.com>
To: Sverre Rabbelier <srabbelier@gmail.com>
Cc: David Barr <david.barr@cordelta.com>,
	Git Mailing List <git@vger.kernel.org>,
	Ramkumar Ramachandra <artagnon@gmail.com>
Subject: Re: [PATCH] fast-import: Allow filemodify to set the root
Date: Thu, 7 Oct 2010 15:28:47 -0500	[thread overview]
Message-ID: <20101007202847.GA13234@burratino> (raw)
In-Reply-To: <AANLkTikjzQ09XBxYZXXQf6XCme3FiLKtusZ0MLTa--mM@mail.gmail.com>

Sverre Rabbelier wrote:

> This means nothing to me

Sorry for the lack of clarity.  Probably I should have just said:

| For a command (like filter-branch --subdirectory-filter) that wants
| to commit a lot of trees that already exist in the object db, writing
| undeltified objects as loose files only to repack them later can
| involve a significant amount[*] of overhead.
|
| 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 commit a given tree without unpacking it.
|
| 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 parse it.  For example,
|
|	M 040000 4b825dc642cb6eb9a060e54bf8d69288fbee4904 ""
|
| is a synonym for the deleteall command.

[*] how significant?  Numbers are always nice. :)

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

Yep.

Thanks.

  reply	other threads:[~2010-10-07 20:33 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-07 10:55 [PATCH] fast-import: Allow filemodify to set the root David Barr
2010-10-07 13:58 ` Sverre Rabbelier
2010-10-07 20:28   ` Jonathan Nieder [this message]
2010-10-07 20:35     ` Sverre Rabbelier
2010-10-07 23:45       ` David Barr
2010-10-07 23:46         ` David Barr
2010-10-07 23:55           ` Sverre Rabbelier
2010-10-08  6:50     ` Johannes Sixt
2010-10-08  7:05       ` Jonathan Nieder
2010-10-08  7:23         ` Johannes Sixt
2010-10-08  8:00           ` Jonathan Nieder
2010-10-08  8:15 ` Ramkumar Ramachandra
2010-10-08  8:33   ` Gabriel Filion
2010-10-08  8:58     ` David Michael Barr
2010-10-08 16:34       ` Sverre Rabbelier
2010-10-08 17:09         ` Jonathan Nieder
2010-10-09 22:11           ` David Michael Barr
2010-10-09 22:12             ` Sverre Rabbelier
2010-10-10  3:30               ` David Barr
2010-10-11  6:34                 ` Jonathan Nieder
2010-10-18  1:00                   ` [PATCH 0/2] " Jonathan Nieder
2010-10-18  1:03                     ` [PATCH 1/2] fast-import: filemodify after M 040000 <tree> "" crashes Jonathan Nieder
2010-10-18  1:13                       ` Sverre Rabbelier
2010-10-18  1:44                         ` Jonathan Nieder
2010-10-20 20:25                       ` [PATCH] fast-import: do not clear notes in do_change_note_fanout() Jonathan Nieder
2010-10-18  1:08                     ` [PATCH 2/2] fast-import: tighten M 040000 syntax Jonathan Nieder
2011-01-16  2:22                 ` [PATCH] Documentation/fast-import: put explanation of M 040000 <dataref> "" in context Jonathan Nieder
2011-01-18 15:04                   ` Junio C Hamano
2011-01-18 21:16                     ` Jonathan Nieder
2011-01-18 21:43                       ` Junio C Hamano
2011-01-18 22:02                         ` Jonathan Nieder

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