[Bug 1085849] Re: Please don't change the answer to linkify-resolvconf

[Thomas Hood]

Something like the following. Then Ubuntu just has to uncomment the
indicated line and comment the line before it.

diff --git a/debian/postinst b/debian/postinst
index 2b4faf7..3822ece 100755
--- a/debian/postinst
+++ b/debian/postinst
@@ -113,9 +113,13 @@ case "$1" in
        fi
 
        # Linkify /etc/resolv.conf if appropriate
+       if [ "$DEBCONF_RECONFIGURE" = 1 ] || [ "$1" = reconfigure ] ; then
+               rm -f /etc/resolvconf/already-linkified-resolvconf
+       fi
        db_get resolvconf/linkify-resolvconf
        if
                [ "$RET" = "true" ]
+#Ubuntu:       [ "$RET" = "true" ] && [ ! -e /etc/resolvconf/already-linkified-resolvconf ]
        then
                if is_immutable_file /etc/resolv.conf ; then
                        report_err "Cannot replace the current /etc/resolv.conf with a symbolic link because it is immutable; to correct this problem, gain root privileges in a terminal and run 'chattr
@@ -148,6 +152,19 @@ case "$1" in
                        fi
                        # Create the link
                        ln -nsf /etc/resolvconf/run/resolv.conf /etc/resolv.conf
+                       # Make a record that we have created it
+                       echo "This is a flag file whose presence indicates that
+the resolvconf package has already created a symbolic link
+at /etc/resolv.conf and should not do so again.
+
+If you remove this file then the resolvconf package will
+create the symbolic link again the next time the package
+is upgraded, provided of course the linkify-resolvconf
+debconf question has an affirmative answer.
+
+If the administrator runs 'dpkg-reconfigure resolvconf'
+then this file is deleted so that the package can make
+another attempt to create the symbolic link." > /etc/resolvconf/already-linkified-resolvconf
                fi
        fi
        ;;

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https://bugs.launchpad.net/bugs/1085849

Title:
  Please don't change the answer to linkify-resolvconf

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  Resolvconf postinst does this:

      db_get resolvconf/linkify-resolvconf
      if [ "$RET" = "true" ] ; then
          [...]
          # Create the link and make sure we don't convert it again on upgrade
          [...]
          ln -nsf ../run/resolvconf/resolv.conf /etc/resolv.conf
          db_set resolvconf/linkify-resolvconf false
      fi

  The problem with the last line is that it obliterates the original
  answer to the question, which makes debugging more difficult. This is
  a non-trivial drawback in connection with bug #1000244 .

  We could achieve the same result without the aforementioned drawback
  if we used an additional debconf question to store the information
  that we have made at least one attempt to linkify.  Roughly:

      db_get resolvconf/linkify-resolvconf
      if [ "$RET" = "true" ] ; then
          [...]
          db_get resolvconf/already-linkified-resolvconf
          if [ "$RET" != "true" ] ; then
              ln -nsf ...
              db_set resolvconf/already-linkified-resolvconf true
          fi
      fi

  The additional debconf question would not be presented to the user and
  would default to "false". (I am waiving here the more philosophical
  objections that may be brought against the use of debconf as a
  registry.  :)

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