** Description changed:
+ [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"; };
+ 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.
** Also affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: apt (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1776218
Title:
New style hook support not robust on removal
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