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openingd: return more informative error message for v2 opens

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Fixes #4562

Reported-By: William Casarin @jb55

New error message:

	zircon:lightning (nifty/fix-4562)$ l1-cli fundchannel_start 03fce775508719e4064b7f19d4e884ddaf51db23bbfc560286ce872f9ed106fee0 10000 253perkw
	{
	   "code": 312,
	   "message": "Peer negotiated `option_dual_fund`, must use `openchannel_init` not `fundchannel_start`."
	}
This commit is contained in:
niftynei 2021-06-01 14:38:55 -05:00 • committed by Rusty Russell
parent e95fc74884
commit cead5e16c0
1 changed files with 9 additions and 0 deletions
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9
lightningd/opening_control.c
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@ -1177,6 +1177,15 @@ static struct command_result *json_fundchannel_start(struct command *cmd,
}
if (!peer->uncommitted_channel) {
if (feature_negotiated(cmd->ld->our_features,
peer->their_features,
OPT_DUAL_FUND))
return command_fail(cmd, FUNDING_STATE_INVALID,
"Peer negotiated"
" `option_dual_fund`,"
" must use `openchannel_init` not"
" `fundchannel_start`.");
return command_fail(cmd, FUNDING_PEER_NOT_CONNECTED,
"Peer not connected");
}