Hello Michael, or anyone else affected,

Accepted apt into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/apt/1.6.3 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 and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. 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!

** Changed in: apt (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1776218

Title:
  New style hook support not robust on removal

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  The new style (json-rpc) hooks are great. However when using them in snapd we 
noticed the following problem. When shipping a hook in 
/etc/apt/apt.conf.d/20snapd.conf like:
  ```
  AptCli::Hooks::Install { "[ ! -f /usr/bin/snap ] || /usr/bin/snap advise-snap 
--from-apt || true"; };
  ```
  this works fine.

  However when the snapd package is removed apt fails with:
  ```
  ...
  Purging configuration files for snapd (1337.2.32.8) ...
  Final directory cleanup
  Discarding preserved snap namespaces
  Removing extra snap-confine apparmor rules
  Removing snapd cache
  Removing snapd state

  E: Could not read response to hello message from hook [ ! -f /usr/bin/snap ] 
|| /usr/bin/snap advise-snap --from-apt || true: Connection reset by peer
  E: Could not read message separator line after handshake from [ ! -f 
/usr/bin/snap ] || /usr/bin/snap advise-snap --from-apt || true: Connection 
reset by peer
  quiet: end of output.
  ```

  I.e. if the hook is not there apt still expectes a handshake.

  [Test case]
  cat > rootdir/etc/apt/apt.conf.d/99-json-hooks << EOF
         AptCli::Hooks::Install:: "true";
         AptCli::Hooks::Search:: "true";
  EOF                             
  and run an install.

  This test and some more error handling tests are part of the test
  suite, too, so autopkgtest covers that for us.

  [Regression potential]
  Hooks that do not respond to the initial handshake and just exit with 0 are 
silently ignored. 

  [Other info]
  There are some more changes in the patch that fix other cases of error 
handling: As can be seen above, there are 2 error messages for one error, 
because the code did not abort early, but tried to carry on, reading more data. 
It now goes directly to the end.

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