[Dovecot] 1.0alpha4: pop3_reuse_xuidl patch

[grant beattie]

hi all,

this is needed to make the pop3_reuse_xuidl option work in 1.0alpha4.

I am using maildir and I noticed that for each message which doesn't
have an indexed X-UIDL header, the entire message is read from disk.
as this is reading only headers, it is probably reasonable to stop
reading at the end of the headers.

it would also be neat if dovecot could be configured to only try
reading X-UIDL headers from messages if the mailbox indexes don't
exist, since I guess it would be common to want to preserve existing
X-UIDLs but not bother for new messages (perhaps some mtime
comparison, or something).

opinions? I haven't looked at the source enough yet to be able to do
this, but these two optimizations would vastly reduce the amount of
disk IO as a result of using this option.

grant.

[apologies if this shows up twice, I originally sent it from an
address which isn't subscribed, and it got held]


--- src/pop3/commands.c.orig	2005-10-17 02:21:39.000000000 +1000
+++ src/pop3/commands.c	2005-11-09 15:26:15.000000000 +1100
@@ -567,6 +567,8 @@
 			mail_get_first_header(ctx->mail, "X-UIDL");
 		if (uidl == NULL)
 			var_expand(str, uidl_format, tab);
+		else
+			str_append(str, uidl);
 
 		ret = client_send_line(client, "%s", str_c(str));
 		t_pop();