python-watcherclient requires Python '>=3.6' but the running Python is 2.7.12

[Min Li]

When I deploy the devstack of rocky , which contains watcher service，I get an error when installing python-watcherclient：

++inc/python:pip_install:354 local test_req=/opt/stack/python-watcherclient/test-requirements.txt
++inc/python:pip_install:355 [[ -e /opt/stack/python-watcherclient/test-requirements.txt ]]
++inc/python:pip_install:356 install_test_reqs='-r /opt/stack/python-watcherclient/test-requirements.txt'
++inc/python:pip_install:363 sudo -H http_proxy= https_proxy= no_proxy= PIP_FIND_LINKS= SETUPTOOLS_SYS_PATH_TECHNIQUE=rewrite /usr/local/bin/pip2.7 install -c /opt/stack/requirements/upper-constraints.txt -r /opt/stack/python-watcherclient/test-requirements.txt -e /opt/stack/python-watcherclient
Ignoring Django: markers 'python_version == "3.4"' don't match your environment
Ignoring Django: markers 'python_version == "3.5"' don't match your environment
Ignoring Pygments: markers 'python_version == "3.4"' don't match your environment
Ignoring Pygments: markers 'python_version == "3.5"' don't match your environment
Ignoring SecretStorage: markers 'python_version == "3.4"' don't match your environment
Ignoring SecretStorage: markers 'python_version == "3.5"' don't match your environment
Ignoring asyncio: markers 'python_version == "3.4"' don't match your environment
Ignoring asyncio: markers 'python_version == "3.5"' don't match your environment
Ignoring cmd2: markers 'python_version == "3.4"' don't match your environment
Ignoring cmd2: markers 'python_version == "3.5"' don't match your environment
Ignoring dnspython3: markers 'python_version == "3.4"' don't match your environment
Ignoring dnspython3: markers 'python_version == "3.5"' don't match your environment
Ignoring jeepney: markers 'python_version == "3.4"' don't match your environment
Ignoring jeepney: markers 'python_version == "3.5"' don't match your environment
Ignoring mypy: markers 'python_version == "3.4"' don't match your environment
Ignoring mypy: markers 'python_version == "3.5"' don't match your environment
Ignoring typed-ast: markers 'python_version == "3.4"' don't match your environment
Ignoring typed-ast: markers 'python_version == "3.5"' don't match your environment
Obtaining file:///opt/stack/python-watcherclient
python-watcherclient requires Python '>=3.6' but the running Python is 2.7.12

[licanwei (li-canwei2)]

Rocky release supports python 2.7
Could you check if there is 'python-requires = >=3.6' in the file python-watcherclient/setup.cfg?
maybe you get the master branch.

[Min Li (limin0801)]

I specified to install the Rocky release of watcher in local.conf：

enable_plugin watcher https://opendev.org/openstack/watcher stable/rocky

But python-watcherclient automatically installed the master branch.
 Although I can modify the python-requires in python-watcherclient / setup.cfg, this is still an issue.

[Min Li (limin0801)]

I specified the python-watcherclient branch as rocky in local.conf, the script stack.sh can be successfully executed. I appreciate you help.

[Dantali0n (dantalion)]

I suspect the bug is not the python versions with rocky but rather with devstack ignoring your branch preference. I have had the same issue in the past.

[Min Li (limin0801)]

Add the following content to local.conf to install the Rocky release of the python-ironicclient：

LIBS_FROM_GIT="python-watcherclient"
WATCHERCLIENT_BRANCH="stable/rocky"

[licanwei (li-canwei2)]

There is no WATCHERCLIENT_BRANCH in devstack, you have to change the branch by yourself.

[Min Li (limin0801)]

Please refer：
https://opendev.org/openstack/devstack/src/branch/stable/rocky/samples/local.conf
# line 76：Using git versions of clients

When the client branch is specified, the suitable client will be installed.