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We currently rely on exec sessions being removed from the state
by the Exec() API itself, on detecting the session stopping. This
is not a reliable method, though. The Podman frontend for exec
could be killed before the session ended, or another Podman
process could be holding the lock and prevent update (most
notable in `run --rm`, when a container with an active exec
session is stopped).
To resolve this, add a function to reap active exec sessions from
the state, and use it on cleanup (to clear sessions after the
container stops) and remove (to do the same when --rm is passed).
This is a bit more complicated than it ought to be because Kata
and company exist, and we can't guarantee the exec session has a
PID on the host, so we have to plumb this through to the OCI
runtime.
Fixes #4666
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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When a container is created with a given OCI runtime, but then it
is uninstalled or removed from the configuration file, Libpod
presently reacts very poorly. The EvictContainer code can
potentially remove these containers, but we still can't see them
in `podman ps` (aside from the massive logrus.Errorf messages
they create).
Providing a minimal OCI runtime implementation for missing
runtimes allows us to behave better. We'll be able to retrieve
containers from the database, though we still pop up an error for
each missing runtime. For containers which are stopped, we can
remove them as normal.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
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