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We've had logrus logging in the monitor code since it landed in
68eb128f (pkg/hooks: Version the hook structure and add 1.0.0 hooks,
2018-04-27, #686). This commit adds similar logging to the initial
hook.New() and Manager.Hooks() calls to make it easier to see if those
are working as expected.
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #887
Approved by: rhatdan
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To more clearly distinguish between the extensionStages input to New()
(a slice of strings) and the map output from Hooks().
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #855
Approved by: rhatdan
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This allows callers to avoid delegating to OCI runtimes for cases
where they feel that the runtime hook handling is unreliable [1].
[1]: https://github.com/projectatomic/libpod/issues/730#issuecomment-392959938
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #855
Approved by: rhatdan
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This isn't an issue with podman, which will only ever use one
directory. But CRI-O generally uses two directories, and we want to
make sure that changes to the fallback directory are not clobbering
hooks configured in the override directory. More background in [1].
I've split the handling into a single-directory block and a
multiple-directory block so we don't waste time polling the filesystem
for single-directory removals.
I'm using the single-directory block for the the zero-directory case
as well. Managers with zero directories should not be receiving
fsnotify events, so I don't think it really matters which block
handles them. If we want to handle this case robustly (because we're
concerned about something in the hook package adjusted the private
.directories property on the fly?), then we'll probably want to add an
explicit zero-directory block in future work.
[1]: https://github.com/kubernetes-incubator/cri-o/pull/1470
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #757
Approved by: rhatdan
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We aren't consuming this yet, but these pkg/hooks changes lay the
groundwork for future libpod changes to support post-exit hooks [1,2].
[1]: https://github.com/projectatomic/libpod/issues/730
[2]: https://github.com/opencontainers/runc/issues/1797
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #758
Approved by: rhatdan
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We also considered ordering with sort.Strings, but Matthew rejected
that because it uses a byte-by-byte UTF-8 comparison [1] which would
fail many language-specific conventions [2].
There's some more discussion of the localeToLanguage mapping in [3].
Currently language.Parse does not handle either 'C' or 'POSIX',
returning:
und, language: tag is not well-formed
for both.
[1]: https://github.com/projectatomic/libpod/pull/686#issuecomment-387914358
[2]: https://en.wikipedia.org/wiki/Alphabetical_order#Language-specific_conventions
[3]: https://github.com/golang/go/issues/25340
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #686
Approved by: mheon
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This shifts the matching logic out of libpod/container_internal and
into the hook package, where we can reuse it after vendoring into
CRI-O. It also adds unit tests with almost-complete coverage. Now
libpod is even more isolated from the hook internals, which makes it
fairly straightforward to bump the hook config file to 1.0.0. I've
dubbed the old format 0.1.0, although it doesn't specify an explicit
version. Motivation for some of my changes with 1.0.0:
* Add an explicit version field. This will make any future JSON
structure migrations more straightforward by avoiding the need for
version-guessing heuristics.
* Collect the matching properties in a new When sub-structure. This
makes the root Hook structure easier to understand, because you
don't have to read over all the matching properties when wrapping
your head around Hook.
* Replace the old 'hook' and 'arguments' with a direct embedding of
the runtime-spec's hook structure. This provides access to
additional upstream properties (args[0], env, and timeout) and
avoids the complication of a CRI-O-specific analog structure.
* Add a 'when.always' property. You can usually accomplish this
effect in another way (e.g. when.commands = [".*"]), but having a
boolean explicitly for this use-case makes for easier reading and
writing.
* Replace the previous annotations array with an annotations map. The
0.1.0 approach matched only the values regardless of key, and that
seems unreliable.
* Replace 'cmds' with 'when.commands', because while there are a few
ways to abbreviate "commands", there's only one way to write it out
in full ;). This gives folks one less thing to remember when
writing hook JSON.
* Replace the old "inject if any specified condition matches" with
"inject if all specified conditions match". This allows for more
precise targeting. Users that need more generous targeting can
recover the previous behavior by creating a separate 1.0.0 hook file
for each specified 0.1.0 condition.
I've added doc-compat support for the various pluralizations of the
0.1.0 properties. Previously, the docs and code were not in
agreement. More on this particular facet in [1].
I've updated the docs to point out that the annotations being matched
are the OCI config annotations. This differs from CRI-O, where the
annotations used are the Kubernetes-supplied annotations [2,3]. For
example, io.kubernetes.cri-o.Volumes [4] is part of CRI-O's runtime
config annotations [5], but not part of the Kubernetes-supplied
annotations CRI-O uses for matching hooks.
The Monitor method supports the CRI-O use-case [6]. podman doesn't
need it directly, but CRI-O will need it when we vendor this package
there.
I've used nvidia-container-runtime-hook for the annotation examples
because Dan mentioned the Nvidia folks as the motivation behind
annotation matching. The environment variables are documented in [7].
The 0.1.0 hook config, which does not allow for environment variables,
only works because runc currently leaks the host environment into the
hooks [8]. I haven't been able to find documentation for their usual
annotation trigger or hook-install path, so I'm just guessing there.
[1]: https://github.com/kubernetes-incubator/cri-o/pull/1235
[2]: https://github.com/kubernetes-incubator/cri-o/blob/v1.10.0/server/container_create.go#L760
[3]: https://github.com/kubernetes-incubator/cri-o/blob/v1.10.0/server/container_create.go#L772
[4]: https://github.com/kubernetes-incubator/cri-o/blob/v1.10.0/pkg/annotations/annotations.go#L97-L98
[5]: https://github.com/kubernetes-incubator/cri-o/blob/v1.10.0/server/container_create.go#L830-L834
[6]: https://github.com/kubernetes-incubator/cri-o/pull/1345/
[7]: https://github.com/NVIDIA/nvidia-container-runtime/tree/v1.3.0-1#environment-variables-oci-spec
[8]: https://github.com/opencontainers/runc/pull/1738
Signed-off-by: W. Trevor King <wking@tremily.us>
Closes: #686
Approved by: mheon
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Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #155
Approved by: mheon
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