git-svn dcommit ignores --username if there are cached credentials

> Hi,
> 
> I am new to Git and using 1.6.6. I'm very interested by using it to mirror SVN 
> repositories. But I am running into troubles with the way git-svn handles SVN 
> credentials. 
> 
> For one SVN I use I have some cached credentials that have only very restricted 
> write access. With svn command, I am using --username for every commit and this 
> cached credential is just ignored: I'm asked for a password.
> 
> With git-svn, I use --username at init/fetch but during dcommit --username is 
> ignored becaused of the cached credential. I can see in SVN logs that the 
> cached credential (which doesn't have the right to commit the mods I made) has 
> been used instead of the one specified during fetch. If I removed the cached 
> credential, the username specified with --username is taken into account (I'm 
> asked a password for it and it works) and if I ommit the --username, the one 
> specified at fetch time is used.
> 
> IMO, looks like a bug... Thanks in advance for any comment.

> Hi Michel,
> 
> I wonder if this is because we explicitly reread the config directory
> when creating Git::SVN::Editor.
> 
> Does using --no-auth-cache work for you?
> 
> Otherwise, try pointing --config-dir= to an empty directory.
> 
> Or you can try this patch to force us to not reread the config_dir:
> 
> diff --git a/git-svn.perl b/git-svn.perl
> index 650c9e5..280fd15 100755
> --- a/git-svn.perl
> +++ b/git-svn.perl
> @@ -550,9 +550,6 @@ sub cmd_dcommit {
>  			my %ed_opts = ( r => $last_rev,
>  			                log => get_commit_entry($d)->{log},
>  			                ra => Git::SVN::Ra->new($url),
> -			                config => SVN::Core::config_get_config(
> -			                        $Git::SVN::Ra::config_dir
> -			                ),
>  			                tree_a => "$d~1",
>  			                tree_b => $d,
>  			                editor_cb => sub {
> 
> We have a good reason to read config dirs there for getting auto-props,
> though, so the above patch isn't going into git.git
>