Yes, thanks for these additions Adam - much appreciated.

…and while we are at it, we will also remove the `slavePreLaunchDockerHook` 
which is equally superseded by that new hook.


> On Nov 29, 2016, at 7:46 PM, Adam Bordelon <a...@mesosphere.io> wrote:
> 
> + dev@, in case some module developers haven't joined the modules@ list yet.
> So this will require code changes (and a recompile) so any module
> implementing the previous hook must now use the new hook, potentially
> updating to set both environments instead of just the one. Such a hook
> compiled against Mesos 1.1 will not work anymore with Mesos 1.2.
> 
> On Tue, Nov 29, 2016 at 10:15 AM, Till Toenshoff <toensh...@me.com> wrote:
> 
>> Hey Folks,
>> 
>> we are removing the slave sided, docker specific hook callback `
>> slavePreLaunchDockerEnvironmentDecorator` and replace it with `
>> slavePreLaunchDockerTaskExecutorDecorator`.
>> 
>> The latter now allows setting two individual environments, one effective
>> for the task and one for the executor. Note that as usual, a custom
>> executor itself may still decide to make (parts of) the executor
>> environment available to its task/s.
>> 
>> We decided to use a protobuf message return signature for that hook,
>> allowing us to add things like e.g. volumes without having to come up with
>> another hook callback — see discussion around https://issues.apache.org/
>> jira/browse/MESOS-6396?focusedCommentId=15654316&page=com.atlassian.jira.
>> plugin.system.issuetabpanels:comment-tabpanel#comment-15654316.
>> 
>> The changes involved should have no extra side-effects - your
>> functionality is unaffected if you don't use custom hooks.
>> 
>> Please remember that hooks are still considered experimental and may still
>> evolve fast.
>> 
>> 
>> Let me know what you think!
>> 
>> Till

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