[openstack-dev] [all][pbr] splitting our deployment vs install dependencies

Joe Gordon joe.gordon0 at gmail.com
Tue Apr 14 22:02:20 UTC 2015

On Tue, Apr 14, 2015 at 2:55 PM, Chris Dent <chdent at redhat.com> wrote:

> On Tue, 14 Apr 2015, Joe Gordon wrote:
>  Upstream there are two separate concepts.
>>> install_requirements, which are meant to document what *must* be
>>> installed to import the package, and should encode any mandatory
>>> version constraints while being as loose as otherwise possible. E.g.
>>> if package A depends on package B version 1.5 or above, it should say
>>> B>=1.5 in A's install_requires. They should not specify maximum
>>> versions except when that is known to be a problem: they shouldn't
>>> borrow trouble.
>>> deploy requirements - requirements.txt - which are meant to be *local
>>> to a deployment*, and are commonly expected to specify very narrow (or
>>> even exact fit) versions.
>> Link to where this is documented? If this isn't written down anywhere,
>> then
>> that should be a pre-requisite to this conversation. Get upstream to
>> document this.
> I don't know where it is documented but this was the common wisdom I
> knew from the Python community since long before coming to the
> OpenStack community. To me, seeing a requirements.txt in a repo that
> represents a class of an app or library (rather than an instance of
> a deployment) was quite a surprise.
> (This doesn't have that much bearing on the practical aspects of
> this conversation, just wanted to add some anecdata that the precedent
> described above is not weird or alien in any way.)


Turns out it was easier then I thought to find the documentation for this.

> --
> Chris Dent tw:@anticdent freenode:cdent
> https://tank.peermore.com/tanks/cdent
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