GNU bug report logs - #32723
[PATCH] Fix erc-autojoin for same channel names on multiple servers

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From: Kevin Brubeck Unhammer <unhammer <at> fsfe.org>
Cc: 32723 <at> debbugs.gnu.org
Subject: bug#32723: [PATCH] Fix erc-autojoin for same channel names on multiple servers
Date: Sun, 10 May 2020 21:45:54 +0200

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Martin Kletzander <nert.pinx <at> gmail.com> čálii:

> When auto-joining channel with the same name on
> multiple channels the auto-join will go over the
> list of channels and for each one it checks if
> there is a buffer and alive server process.
> However it does not check if the server process
> matches the server being currently processed for
> auto-joining.
>
> This happens since commit "Don't join erc channels
> doubly"
>
> Fix it by checking if the currently processed
> server matches the erc process name of the already
> joined channel.

That's not always going to match though. The car's of
erc-autojoin-channels contain the values of erc-server-announced-name or
erc-session-server, not the process-name of
erc-server-process. E.g. when I join my weechat relay,
erc-session-server is "example.com" and erc-server-announced-name is
"weechat.relay.irc" while (process-name erc-server-process) is
"erc-example.com-9001<1>".

Also, the check is against the current erc-server-process (for the
server being joined). Isn't the intention of the patch to check against
the candidate buffer's server-process?

I would expect something like

	      (when (or (not buffer)
			;; If the same channel is joined on another
			;; server the best-effort is to just join
                        (not (with-current-buffer buffer
                               (or (string-match-p (car l) erc-session-server)
                                   (string-match-p (car l) erc-session-announced-name))))
			(not (with-current-buffer buffer
			       (erc-server-process-alive))))
		(erc-server-join-channel server chan))

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