I am trying to add an external alias for my site and, because of silly NAT, the IPv4 interface doesn't match what DNS (as opposed to /etc/hosts) returns. IPv6 works fine though, but since ikiwiki-hosting first looks for IPv4 records, it fails to pick that up. I have a crude hack to fix this, but it doesn't seem like the good approach. "Worked for me" though. ;)

Example, without the patch:

    root@marcos:/home/a-wiki# ikisite domains wiki.anarcat.ath.cx --external=anarcat.ath.cx --alias=wiki.anarcat.ath.cx  
    DNS not configured correctly for anarcat.ath.cx - 72.0.72.144

Note that I had to patch to even get that debugging information:

[[!format diff """
diff --git a/ikisite b/ikisite
index adc5df3..82a29cb 100755
--- a/ikisite
+++ b/ikisite
@@ -1193,7 +1193,7 @@ sub domains {
                }
                if ($address ne $hostname) {
                        if (! grep { defined $_ && $_ eq $address } site_addresses()) {
-                               print STDERR "DNS not configured correctly for $options{external}\n";
+                               print STDERR "DNS not configured correctly for $options{external} - got $address\n";
                                exit 3; # special code
                        }
                        else {
"""]]

With the following patch, the thing actually works:

[[!format diff """
diff --git a/IkiWiki/Hosting.pm b/IkiWiki/Hosting.pm
index b802f21..08365d2 100644
--- a/IkiWiki/Hosting.pm
+++ b/IkiWiki/Hosting.pm
@@ -128,7 +128,7 @@ sub host_address_or_cname {
        # cached NXDOMAIN from earlier tests. We want to see the current
        # state of the DNS.
        # dig has to be run a second time to check for ipv6 AAAA addresses.
-       foreach my $atype (qw{A AAAA}) {
+       foreach my $atype (qw{AAAA A}) {
                open(DIG, "-|", "dig", "-t$atype", "+nofail", "+trace", "$host.") || error "dig: $!";
                while (<DIG>) {
                        next if /^;/;
"""]]

    root@marcos:/home/a-wiki# ikisite domains wiki.anarcat.ath.cx --external=anarcat.ath.cx --alias=wiki.anarcat.ath.cx  
    warning: DNS for anarcat.ath.cx hardcodes IP 2001:1928:1:9:beae:c5ff:fe89:e238
    [...]

As I said, this is a rather naive patch. Maybe this kind of overall prioritisation should be a config option? Or should we have a way to override the IP detection? Not sure how to handle this, really... Maybe the simplest fix is to have a --force argument... -- [[anarcat]]

----

The following patch allows overriding the IP detection mechanism:

[[!format diff """
From: =?UTF-8?q?Antoine=20Beaupr=C3=A9?= <anarcat@koumbit.org>
Date: Sat, 17 Dec 2011 14:13:29 -0500
Subject: [PATCH] allow hardcoding the IPs

---
 IkiWiki/Hosting.pm   |    9 +++++++++
 ikiwiki-hosting.conf |    6 ++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/IkiWiki/Hosting.pm b/IkiWiki/Hosting.pm
index b802f21..f09dd3b 100644
--- a/IkiWiki/Hosting.pm
+++ b/IkiWiki/Hosting.pm
@@ -104,6 +104,9 @@ sub outtemplate {
 sub site_addresses {
 	# Looks up the site's main addresses; those that have a default
 	# route.
+	if ($config{hardcode_ipv4} && $config{hardcode_ipv6}) {
+		return ($config{hardcode_ipv4}, $config{hardcode_ipv6});
+	}
 	my ($defiface) = `ip route` =~ m/^default via .* dev ([a-zA-Z0-9]+)/m;
 	if (! $defiface) {
 		# Maybe ipv6 only.
@@ -115,6 +118,12 @@ sub site_addresses {
 	my $show=`ip addr show $defiface`;
 	my ($ipv4) = $show =~ m/inet (\d+\.\d+\.\d+\.\d+).*scope global/m;
 	my ($ipv6) = $show =~ m/inet6 ([a-zA-Z0-9:]+).*scope global/m;
+	if ($config{hardcode_ipv4}) {
+		$ipv4 = $config{hardcode_ipv4};
+	}
+	if ($config{hardcode_ipv6}) {
+		$ipv6 = $config{hardcode_ipv6};
+	}
 	return ($ipv4, $ipv6);
 }
 
diff --git a/ikiwiki-hosting.conf b/ikiwiki-hosting.conf
index f0f124f..ad8e14c 100644
--- a/ikiwiki-hosting.conf
+++ b/ikiwiki-hosting.conf
@@ -24,6 +24,12 @@ allow_ipv4=0
 allow_ipv6=0
 # (Disable all of the above to disable auto-assignment of DNS addresses.)
 
+# by default, ikiwiki-hosting looks at the first IP on the interface
+# that has the default gateway, but this may fail if you're behind NAT
+# or else. those allow you to hardcode the IPs
+# hardcode_ipv4=10.0.0.1
+# hardcode_ipv6=fr00::0
+
 # This is the DNS TTL to use when adding a hostname for a site.
 ttl=28800
 
-- 
1.7.7.3


"""]]]

I am running with this patch in production now, seems to work okay. --[[anarcat]]

> [[applied|done]] --[[Joey]] 
