Charm does not support jammy

[Vern Hart]

The charm's metadata does not include jammy but if you install it as focal you can related it to jammy units.

When you do so, the install hook fails with:

  error in Tempita setup command: use_2to3 is invalid.

Full hook execution at the end.

If I comment out use_2to3 in setyp.py inside the Tempita tarball, it gets past that but then says:

  ERROR could not download resource: HTTP request failed: Get https://10.51.11.25:17070/model/9a1a5658-625c-4698-89ff-1bef72ce5f36/units/unit-juju-introspection-proxy-1/resources/juju-introspection-proxy: resource#juju-introspection-proxy/juju-introspection-proxy not found

I am not sure if the resource issue is related to the charm or to the last time the charm was registered with charmstore (since we've seen resource issues recently). Modifying _resource_get in lib/charms/layer/snap.py to always return False allows a successful hook execution.

root@juju-1:/var/lib/juju/agents/unit-juju-introspection-proxy-0/charm# hooks/install
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
python3-pip is already the newest version (22.0.2+dfsg-1).
python3-wheel is already the newest version (0.37.1-2).
build-essential is already the newest version (12.9ubuntu3).
python3-setuptools is already the newest version (59.6.0-1.2).
python3-yaml is already the newest version (5.4.1-1ubuntu1).
python3-dev is already the newest version (3.10.6-1~22.04).
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
Looking in links: wheelhouse
Requirement already satisfied: pip in /var/lib/juju/agents/unit-juju-introspection-proxy-0/.venv/lib/python3.10/site-packages (22.0.2)
Looking in links: wheelhouse
Requirement already satisfied: setuptools in /var/lib/juju/agents/unit-juju-introspection-proxy-0/.venv/lib/python3.10/site-packages (59.6.0)
Looking in links: wheelhouse
Requirement already satisfied: setuptools-scm in /var/lib/juju/agents/unit-juju-introspection-proxy-0/.venv/lib/python3.10/site-packages (1.17.0)
Looking in links: wheelhouse
Processing ./wheelhouse/charmhelpers-0.20.20.tar.gz
  Preparing metadata (setup.py) ... done
Processing ./wheelhouse/pbr-5.5.1.tar.gz
  Preparing metadata (setup.py) ... done
Processing ./wheelhouse/PyYAML-5.2.tar.gz
  Preparing metadata (setup.py) ... done
Processing ./wheelhouse/Jinja2-2.10.1.tar.gz
  Preparing metadata (setup.py) ... done
Processing ./wheelhouse/netaddr-0.7.19.tar.gz
  Preparing metadata (setup.py) ... done
Processing ./wheelhouse/Tempita-0.5.2.tar.gz
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      error in Tempita setup command: use_2to3 is invalid.
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-juju-introspection-proxy-0/charm/hooks/install", line 8, in <module>
    basic.bootstrap_charm_deps()
  File "/var/lib/juju/agents/unit-juju-introspection-proxy-0/charm/lib/charms/layer/basic.py", line 206, in bootstrap_charm_deps
    check_call([pip, 'install', '-U', reinstall_flag, '--no-index',
  File "/usr/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/var/lib/juju/agents/unit-juju-introspection-proxy-0/.venv/bin/pip', 'install', '-U', '--force-reinstall', '--no-index', '--no-cache-dir', '-f', 'wheelhouse', 'charmhelpers', 'pbr', 'PyYAML', 'Jinja2', 'netaddr', 'Tempita', 'tenacity', 'wheel', 'MarkupSafe', 'pyaml', 'six', 'charms.reactive']' returned non-zero exit status 1.