New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

*: Remove hooks #483

Closed

wking wants to merge 1 commit into opencontainers:master from wking:drop-hooks

Commits on Aug 13, 2016

*: Remove hooks

This drops all instances (outside the ChangeLog) turned up by
case-insensitive searches for 'hook'.

The desire to drop hooks has been around for a while now [1], but it
took a while to land a create/start split.  By the time that split did
land, dropping hooks was still part of its motivation [2].  Hooks are
hard to support robustly [3], and after the create/start split,
callers can do whatever they like at those times without having to go
through the runtime [4].  There is still a use-case for folks who
prefer the old all-in-one UX, but we can support those folks with a
higher-level wrapper built on hookless create/start primatives [5].
There was some last-minute discussion of pre-pivot mount propagation
needing pre-start hooks [6], but that use case can be addressed by
manipulating the mounts array [7].  With those arguments in place, the
consensus at today's meeting seemed in favor of removing hooks from
the spec [8].  And after some second-guessing [9], we're now back in
favor of removing hooks from the spec [10].

[1]: http://ircbot.wl.linuxfoundation.org/meetings/opencontainers/2015/opencontainers.2015-10-28-17.02.log.html#l-71
     <wking> if you have a distinct create operation, you can drop the
       pre-start hooks, which makes a simpler spec
[2]: opencontainers#384
     Subject: Split create and start

     In the topic post:

     > # Motivating usecases:
     >
     > * to simplify the flows/interaction patterns by removing hooks,
     >   but still allow for the same functionality

[3]: opencontainers#265
     Subject: runtime-config: Require serial hook execution
[4]: http://ircbot.wl.linuxfoundation.org/eavesdrop/%23opencontainers/%23opencontainers.2016-03-24.log.html#t2016-03-24T18:56:15
     <vishh> mrunalp: How do I run http hooks? I need a binary wrapper
       to execute http hooks
[5]: https://groups.google.com/a/opencontainers.org/d/msg/dev/Y7p6YW8zr4s/OVaAI_WDBAAJ
     Subject: Re: Hooks and all-in-one operation
     Date: Wed, 1 Jun 2016 11:49:07 -0700
     Message-ID: <20160601184907.GF4149@odin.tremily.us>
[6]: opencontainers#384 (comment)
     Subject: Split create and start
[7]: opencontainers#384 (comment)
     Subject: Split create and start
[8]: http://ircbot.wl.linuxfoundation.org/meetings/opencontainers/2016/opencontainers.2016-06-01-17.01.log.html#l-83
[9]: https://groups.google.com/a/opencontainers.org/forum/#!topic/dev/Y7p6YW8zr4s
     Subject: Hooks and all-in-one operation
     Date: Wed, 1 Jun 2016 11:38:27 -0700
     Message-ID: <CANEZBD69Q4VV4UoBodWjtAR1PrJ1OysaMUHgA5cW_aGj2ZEhLQ@mail.gmail.com>
[10]: http://ircbot.wl.linuxfoundation.org/meetings/opencontainers/2016/opencontainers.2016-08-03-21.01.log.html#l-21

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

wking committed Aug 13, 2016