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config: Clarify execution environment for hooks #953

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Apr 6, 2018
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config: Clarify execution environment for hooks #953

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2 changes: 2 additions & 0 deletions config.md
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Expand Up @@ -375,6 +375,7 @@ For POSIX platforms, the configuration structure supports `hooks` for configurin
Entries in the array contain the following properties:
* **`path`** (string, REQUIRED) with similar semantics to [IEEE Std 1003.1-2008 `execv`'s *path*][ieee-1003.1-2008-functions-exec].
This specification extends the IEEE standard in that **`path`** MUST be absolute.
Runtimes MUST resolve this value in the [runtime namespace](glossary.md#runtime-namespace).
* **`args`** (array of strings, OPTIONAL) with the same semantics as [IEEE Std 1003.1-2008 `execv`'s *argv*][ieee-1003.1-2008-functions-exec].
* **`env`** (array of strings, OPTIONAL) with the same semantics as [IEEE Std 1003.1-2008's `environ`][ieee-1003.1-2008-xbd-c8.1].
* **`timeout`** (int, OPTIONAL) is the number of seconds before aborting the hook.
Expand All @@ -386,6 +387,7 @@ For POSIX platforms, the configuration structure supports `hooks` for configurin

Hooks allow users to specify programs to run before or after various lifecycle events.
Hooks MUST be called in the listed order.
Hooks MUST be executed in the [runtime namespace](glossary.md#runtime-namespace).
The [state](runtime.md#state) of the container MUST be passed to hooks over stdin so that they may do work appropriate to the current state of the container.

### <a name="configHooksPrestart" />Prestart
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