[Bug 2011480] [NEW] /etc/network/if-up.d/resolved: 12: mystatedir: not found

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We're using ifupdown-0.8.36+nmu1ubuntu3.deb on Ubuntu 22.04, and when
the system starts, it prints this line in /var/log/syslog and the
journal:

Mar 13 14:18:15 hostname-goes-here ifup[506]: /etc/network/if-
up.d/resolved: 12: mystatedir: not found

The relevant lines in /etc/network/if-up.d/resolved:

  1 #!/bin/sh
  2 #
  3 # Script fragment to make ifupdown supply DNS infromation to resolved
  4 #
  5 
  6 case "$ADDRFAM" in
  7     inet|inet6) : ;;
  8     *) exit 0 ;;
  9 esac
 10 
 11 if systemctl is-enabled systemd-resolved > /dev/null 2>&1; then
 12     mystatedir statedir ifindex interface
 13 
 14     interface=$IFACE
 15     if [ ! "$interface" ]; then
 16         return
 17     fi

Surprisingly, the same line is present in /etc/network/if-
down.d/resolved and causes the same error message.

Given that line 16 says 'return', I'm guessing that this used to be a
function, and so line 12 might have started with 'local'...?

Fortunately, this is just a cosmetic problem, generating a few errors in
the system logs.

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New

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/etc/network/if-up.d/resolved: 12: mystatedir: not found
https://bugs.launchpad.net/bugs/2011480
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