We should also consider:
```
# CLEAN
fermulator@fermmy:~$ host -t soa local.
Host local. not found: 3(NXDOMAIN)
fermulator@fermmy:~$ echo $?
1
# BROKEN (host hangs)
fermulator@fermmy:~$ LC_ALL=C /usr/bin/timeout 1 host -t soa local. 2>&1
fermulator@fermmy:~$ echo $?
124
# timeout
fermulator@fermmy:~$ timeout 1 sleep 2
fermulator@fermmy:~$ echo $?
124
# no timeout
fermulator@fermmy:~$ timeout 5 sleep 1
fermulator@fermmy:~$ echo $?
0
```
Isn't the existing logic broken? (perhaps insufficient
comments/documentation in this method for me to conclude either way ...
the intention maybe is unclear)
```
if [ $? -eq 0 ] ; then
if echo "$OUT" | egrep -vq 'has no|not found'; then
return 0
fi
else
# Checking the dns servers failed. Assuming no .local unicast dns, but
# remove the nameserver cache so we recheck the next time we're triggered
rm -f ${NS_CACHE}
fi
```
later it's used only here
```
if dns_has_local ; then
# .local from dns server, disabling avahi
disable_avahi
else
# no .local from dns server, enabling avahi
enable_avahi
fi
```
When host call fails (even with timeout), it returns "1" claiming
"dns_has_local()=true".
{{{
fermulator@fermmy:~$ OUT="Host local. not found: 3(NXDOMAIN)"
fermulator@fermmy:~$ if echo "$OUT" | egrep -vq 'has no|not found'; then echo
"RETURN 0"; else echo "RETURN 1"; fi
RETURN 1
}}}
At least the additional wrapping of timeout (workaround) doesn't make it
any worse I suppose ...
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https://bugs.launchpad.net/bugs/1752411
Title:
bind9-host, avahi-daemon-check-dns.sh hang forever causes network
connections to get stuck
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