[Bug 1972029] Please test proposed package

[Steve Langasek]

Hello Pedro, or anyone else affected,

Accepted isc-dhcp into jammy-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/isc-
dhcp/4.4.1-2.3ubuntu2.2 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
jammy to verification-done-jammy. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-jammy. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1972029

Title:
  dhclient overriding stub-resolv.conf file on Jammy

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Jammy:
  Fix Committed
Status in isc-dhcp source package in Kinetic:
  Fix Released

Bug description:
  [Issue]
  On Jammy, the stub-resolv.conf file on /run/systemd/resolve gets overwritten if dhclient is executed.

  While debugging this, I found the reference on LP#1889068 [0] of the
  move of `resolved` hook from dhclient-enter-hooks.d/ to dhclient-exit-
  hooks.d/, and this new hook [2] has no reference of make_resolv_conf()
  being called.

  [Reproducer]
  -
  I used a cloud-image based Jammy installation (uvt-kvm).  Once in:

  $ cat /run/system/resolve/stub-resolv.conf

  And one will see:

  nameserver 127.0.0.53
  options edns0 trust-ad
  search .

  Then:

  $ sudo dhclient
  $ cat /run/system/resolve/stub-resolv.conf

  You'll see the definition of the nameserver(s) in, and the stub IP
  address no longer there.  To revert this, a `systemctl restart
  systemd-resolved` is needed.

  [Impact]

  This is an improper way to keep nameserver(s) in *resolv* files; the
  override of the file should never happen in these circumstances.

  [Extra]
  -
  As a minor test, I copied over the dhclient-enter-hooks.d/resolved file from a Focal installation to a Jammy one, and the problem _does not happen_ when such hook is in place.

  [ . . . ]

  Let me know if further clarification is needed to proceed.  Thank you.

  BR,
  pprincipeza

  [0] https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1889068
  [1] https://paste.ubuntu.com/p/bvqPZXZZ8w/
  [2] https://paste.ubuntu.com/p/YQdG6z4WS7/

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