From: Petr Baudis <pasky@suse.cz>
Date: Sat, 23 Sep 2006 17:06:21 GMT
Subject: Re: [RFC][RESEND][PATCH] Allow fetching from multiple repositories at once
Message-ID: <20060923170621.GR8259@pasky.or.cz>
In-Reply-To: <20060923164308.16334.49252.stgit@machine.or.cz>

Dear diary, on Sat, Sep 23, 2006 at 06:45:09PM CEST, I got a letter
where Petr Baudis <pasky@suse.cz> said that...
> You still need to pass git-fetch-pack some URL in addition to the
> repositories - it is used only for git_connect(), the purpose is that
> repositories must be local directories so if you want to talk remote, you
> need to do something like
> 
> 	git-fetch-pack git://kernel.org/pub/scm/git/git.git --repo=/pub/scm/git/git.git master next --repo=/pub/scm/cogito/cogito.git master
..snip..
> The main target of this are the Xorg people who have plenty of small repos
> and frequently want to update many of them. It would be nice if someone
> from Xorg reading this and concerned with this could measure the
> difference.

Attached is a simple porcelain script for this.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
#!/bin/perl -sp0777i<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<j]dsj
$/=unpack('H*',$_);$_=`echo 16dio\U$k"SK$/SM$n\EsN0p[lN*1
lK[d2%Sa2/d0$^Ixp"|dc`;s/\W//g;$_=pack('H*',/((..)*)$/)


#!/usr/bin/perl
use warnings;
use strict;

# Remember that you must ensure the obj database is shared - either symlink it
# or setup alternates!
#my $remoteurl = 'git://git.kernel.org/pub/scm/git/git.git';
#my %config = (
#	'/pub/scm/git/git.git' => {
#		'next' => {
#			'/home/xpasky/q/gg' => 'origin'
#		},
#		'master' => {
#			'/home/xpasky/q/gg' => 'origin2',
#			'/home/xpasky/q/gg2' => 'origin'
#		}
#	},
#	'/pub/scm/cogito/cogito-doc.git' => {
#		master => {
#			'/home/xpasky/q/gg2' => 'origin2'
#		}
#	}
#);
my $remoteurl = 'puturlofremotehosthere';
my %config = (
	'remoterepo1' => {
		branch1 => {
			'localrepo1' => 'origin'
		},
		branch2 => {
			'localrepo1' => 'origin2',
			'localrepo2' => 'origin'
		}
	},
	'remoterepo2' => {
		master => {
			'localrepo2' => 'origin2'
		}
	}
);

my @args = ($remoteurl);
foreach my $repo (keys %config) {
	push (@args, '--repo='.$repo);
	foreach my $branch (keys %{$config{$repo}}) {
		push (@args, $branch);
	}
}

open (F, '-|', 'git-fetch-pack', @args) or die "$!";
while (<F>) {
	chomp;
	split / /, $_;
	my ($sha, $ref, $repo) = @_;
	$ref =~ s#^refs/heads/##;
	foreach my $lrepo (keys %{$config{$repo}->{$ref}}) {
		system("GIT_DIR=$lrepo git-update-ref $config{$repo}->{$ref}->{$lrepo} $sha");
	}
}
close (F);