Support China regions

[zxkane]

AWS CodeCommit is GA in AWS China now. Pls support china regions(cn-north-1 and cn-northwest-1).

See below error when pushing code to AWS CodeCommit in cn-northwest-1.

git remote add codecommit codecommit::cn-northwest-1://CodecommitDevopsModelStack-MyApp1

git push codecommit master:init
The following AWS Region is not available for use with AWS CodeCommit: cn-northwest-1. For more information about CodeCommit's availability in AWS Regions, see the AWS CodeCommit User Guide. If an AWS Region is listed as supported but you receive this error, try updating your version of the AWS CLI or the AWS SDKs.

AWS cli already is latest version,

aws --version
aws-cli/2.0.9 Python/3.8.2 Darwin/18.7.0 botocore/2.0.0dev13

[zxkane]

It should be caused by boto/botocore#2026.

[zxkane]

How about making the checking of available region as a warning? Currently the CodeBuild is blocked by this to pull source from CodeCommit. Looks like it has a lag(several days) to sync the new services availability to the botocore's static config.

Looks like it will always occur when CodeCommit is expanded to new regions.

[liangruibupt]

Here is workaround:

edit the file 
<YOUR_CURRENT_PYTHON_DIR>/site-packages/git_remote_codecommit/__init__.py

locate the line:
     available_regions = [region for partition in session.get_available_partitions() for region in session.get_available_regions('codecommit', partition)]
(Added in >>>) available_regions.append("cn-north-1")
(Added in >>>) available_regions.append("cn-northwest-1")

git clone codecommit::cn-northwest-1://cn-north-1@MyDemoRepo
Cloning into 'MyDemoRepo'...
remote: Counting objects: 20, done.
Unpacking objects: 100% (20/20), done.

[tuxinaut]

We setup the helper last Friday in cn-north-1 and it worked out of the box, so it should work as well flawlessly for cn-northwest-1 .

[zxkane]

It had been resolved by latest botocore.

[tuxinaut]

:+1: