[ros-users] rosdep.yaml

[Kevin Walchko]

thanks … makes sense



On Sep 1, 2011, at 8:48 PM, Ken Conley wrote:

> On Thu, Sep 1, 2011 at 8:36 PM, Kevin Walchko <kevin.walchko at gmail.com> wrote:
>> Hi,
>> 
>> I have been busy playing with homebrew and ROS and changing rosdep.yaml files. I did not realize there were so many spread all over the place and some of them repeat the same thing. Has there been any though to having one main rosdep.yaml file for ROS so you only have to change things in one place? Maybe in the common_rosdeps stack?
> 
> The short answer: we tried that, it didn't work out so well.
> 
> Longer answer:
> 
> 1. If you see rosdep.yamls repeating the same thing, that's probably
> worth a ticket.  In general, common dependencies should migrate
> upwards.  There is some heavy-ness in the main ros/rosdep.yaml file,
> but we are slowly trying to migrate that out.
> 
> 2. Having a monolithic rosdep.yaml sets up some problematic conditions.
> 
> First, it makes every stack depend on a particular, frequently
> changing file.  When we had a monolithic file, we were having to put
> out 4GB+ debian updates because we had to rebuild every stack just
> because we got patches for Fedora or the like.
> 
> Second, it locks in every ROS stack to the same integration decision.
> Given the variety of platforms that ROS runs on, we wish to minimize
> this as much as possible and only lock in the choices that are
> widespread (e.g. boost, python).
> 
> Third, you start losing track of which of the rosdep entries are
> actually useful.  You have to perform exhaustive audits to figure out
> if a rosdep is actually used (I've slowly been trying to purge the
> entries in ros/rosdep.yaml and have run into this problem).
> 
> There are potentially other ways to address these issues, but a single
> monolithic file has already been tried and moved away from.
> 
> - Ken
> 
>> Curious.
>> 
>> Kevin
>> 
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