[stable/ocata] Latest oslo.i18n version conflicts with latest Babel version

[Daniel Park]

The latest version of oslo.i18n (3.17.0) and the latest version of Babel (2.4.0) are being installed based on the following stable/ocata global requirements:

Babel>=2.3.4 # BSD
oslo.i18n>=2.1.0 # Apache-2.0

However, oslo.i18n 3.17.0 pins against Babel 2.4.0:
https://github.com/openstack/oslo.i18n/blob/3.17.0/requirements.txt#L6

This causes a VersionConflict exception when attempting to run components like Keystone.

Suggested solutions:
1) Pin against Babel 2.4.0 in global requirements or
2) Pin oslo.i18n to version <= 3.15.0

[Matthew Thode (prometheanfire)]

current upper-constraints.txt

Babel===2.3.4
oslo.i18n===3.12.0

Those are considered what are stable and tested for stable/ocata.

Babel 2.4.0 was blacklisted

Babel 2.4.0 does not handle "-" in locale po files like "ko-KR". This is fixed now for the upcoming Babel 2.4.1 release.

it sounds like we need to backport that to ocata.

[Tony Breeds (o-tony)]

oslo.i18n 3.17.0 is a pike library and shouldn't be used on ocata. While I understand the temptation to block it that's not a thing we can do as it causes cascading problems.

The correct solution is to install packages with version as listed in upper-constraints.txt.

I'd consider a backport of the block of 2.4.0 from pike to ocata but not to newton (as this isn't a critical or security related bug)

https://review.openstack.org/493751 I'm not convinced that's the right thing to do

[Matthew Thode (prometheanfire)]

@daniepar why are you trying to install those versions instead using upper-constraints.txt?

[Daniel Park (daniepar)]

@prometheanfire this was what I ended up with after installing Keystone stable/ocata:
https://github.com/openstack/keystone/blob/736149c0cd91e66121229ed9aea8ddc90ea2eb26/requirements.txt

Guess I'll need to include the upper-constraints.txt whenever installing an OpenStack component?

[Matthew Thode (prometheanfire)]

That would be best, and make sure it's from the right branch.