check the status of the state passed to hooks over stdin

[liangchenye]

Signed-off-by: Liang Chenye [email protected]

[liangchenye]

It is a successor PR of #589.
It only checks prestart status and poststart status.

The poststop status is not meaningful since the container will be deleted and the id might be reused.
I skip the poststop check.

[wking]

It would be nice to pass the *tap.T into stdinStateCheck so it can add multiple errors instead of dying on the first.

[wking]

I think the current spec wants this to be stopped (more discussion in opencontainers/runtime-spec#958), although more spec clarity would be nice. But what the spec is clear about is that status must be set to something.

[liangchenye]

I'll update the code since 'status' must be set to something code. and wait for runtime-spec#958.

[liangchenye]

Now we only output three 'OK or NOT' results, each result may have the detailed property errors information. I join the state property errors of a hook together by using multiple errors.

[dongsupark]

@liangchenye
I happened to see this PR, as it's exactly what @alban and I were going to implement.
Though with this PR, the hooks_stdin.t test fails like it:

not ok 1 - the state of the container MUST be passed to "prestart" hook over stdin
  ---
  {
    "error": "1 error occurred:\n\n* wrong status \"\" in the stdin of prestart hook, expected \"created\"",
    "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/config.md#posix-platform-hooks"
  }
  ...

It looks like Status is always being set to an empty string.

[wking]

It looks like Status is always being set to an empty string.

That's opencontainers/runc#1741, which I'd also linked from here. I think we should land these better checks here withought waiting for runc to fix its behavior.

[dongsupark]

@wking Thanks for the info.
I'll try to test it with the runc fix later. Anyway I'm fine with merging this PR without waiting for runc.

[liangchenye]

rebased PTAL @q384566678

[zhouhao3]

looks good, But when I run the test, I get the error.
@liangchenye Did you test successfully?

➜  runtime-tools git:(7c6996f) ✗ sudo ./hooks_stdin
TAP version 13
not ok 1 - the state of the container MUST be passed to "prestart" hook over stdin
  ---
  {
    "error": "1 error occurred:\n\n* wrong status \"\" in the stdin of prestart hook, expected \"created\"",
    "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/config.md#posix-platform-hooks"
  }
  ...
not ok 2 - the state of the container MUST be passed to "poststart" hook over stdin
  ---
  {
    "error": "1 error occurred:\n\n* wrong status \"\" in the stdin of poststart hook, expected \"running\"",
    "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/config.md#posix-platform-hooks"
  }
  ...
not ok 3 - the state of the container MUST be passed to "poststop" hook over stdin
  ---
  {                             
    "error": "1 error occurred:\n\n* status in the stdin of poststop hook should not be empty",
    "reference": "https://github.com/opencontainers/runtime-spec/blob/v1.0.0/config.md#posix-platform-hooks"
  }
  ...
1..3

[liangchenye]

@q384566678 Yes, it does not work because of the runc bug

[zhouhao3]

LGTM