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config-linux: Make Linux 'devices' explicitly optional #526

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merged 2 commits into from Aug 7, 2016

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wking
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@wking wking commented Aug 3, 2016

Both linux.devices and linux.resources.devices. Details in the commit messages.

To match the omitempty which the Go property has had since 28cc423
(add omitempty to 'Device' and 'Namespace', 2016-03-10, opencontainers#340).

Signed-off-by: W. Trevor King <wking@tremily.us>
And mark it omitempty to avoid:

  $ ocitools generate --template <(echo '{"linux": {"resources": {}}}') | jq .linux
  {
    "resources": {
      "devices": null
    }
  }

Signed-off-by: W. Trevor King <wking@tremily.us>
@mrunalp
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mrunalp commented Aug 3, 2016

LGTM

Approved with PullApprove

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@hqhq
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hqhq commented Aug 7, 2016

LGTM

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@hqhq hqhq merged commit c9c2574 into opencontainers:master Aug 7, 2016
@wking wking deleted the optional-devices branch August 18, 2016 04:54
wking added a commit to wking/ocitools-v2 that referenced this pull request Nov 8, 2016
This saves a few lines of code and removes a layer of indirection.
It's now obvious to the caller exactly what is changing, although
there is sometimes less per-setting validation.  That's ok though;
folks interested in validating the config can call the validator on it
after they've finished mucking about.

This new approach also initializes any needer pointer fields at the
top.  With the current runtime-spec types, that can lead to some
orphaned pointer fields, e.g.;

  $ ./oci-runtime-tool generate --template <(echo '{}')
  {
          "ociVersion": "1.0.0-rc1-dev",
          "platform": {
                  "os": "linux",
                  "arch": "amd64"
          },
          "process": {
                  "user": {
                          "uid": 0,
                          "gid": 0
                  },
                  "args": null,
                  "cwd": "/"
          },
          "root": {
                  "path": "rootfs"
          },
          "hooks": {},
          "linux": {
                  "resources": {
                          "devices": null
                  }
          }
  }

but the devices issue was fixed in runtime-spec 1.0.0-rc2 [1] and
there are other approaches to collapsing unused pointer properties
[2].

[1]: opencontainers/runtime-spec#526
[2]: opencontainers#112

Signed-off-by: W. Trevor King <wking@tremily.us>
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3 participants