The processing and setting of the static and volume directories was
scattered across the code base (including c/common) leading to subtle
errors that surfaced in #19938.
There were multiple issues that I try to summarize below:
- c/common loaded the graphroot from c/storage to set the defaults for
static and volume dir. That ignored Podman's --root flag and
surfaced in #19938 and other bugs. c/common does not set the
defaults anymore which gives Podman the ability to detect when the
user/admin configured a custom directory (not empty value).
- When parsing the CLI, Podman (ab)uses containers.conf structures to
set the defaults but also to override them in case the user specified
a flag. The --root flag overrode the static dir which is wrong and
broke a couple of use cases. Now there is a dedicated field for in
the "PodmanConfig" which also includes a containers.conf struct.
- The defaults for static and volume dir and now being set correctly
and adhere to --root.
- The CONTAINERS_CONF_OVERRIDE env variable has not been passed to the
cleanup process. I believe that _all_ env variables should be passed
to conmon to avoid such subtle bugs.
Overall I find that the code and logic is scattered and hard to
understand and follow. I refrained from larger refactorings as I really
just want to get #19938 fixed and then go back to other priorities.
https://github.com/containers/common/pull/1659 broke three pkg/machine
tests. Those have been commented out until getting fixed.
Fixes: #19938
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
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