Telegraf Charm

install hook failed due CacheControl require python>=3.6

Bug #1957095 reported by Robert Gildein on 2022-01-11

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Telegraf Charm	Fix Released	Undecided	Robert Gildein	Telegraf Charm 22.04

Bug Description

The installation hook failed because the CacheControl package requires python>=3.6.

Logs
```bash
unit-telegraf-0: 15:07:15 INFO juju.worker.uniter found queued "install" hook
unit-telegraf-0: 15:07:29 INFO juju.worker.meterstatus skipped "meter-status-changed" hook (missing)
Extracting templates from packages: 100%elegraf/0.install
unit-telegraf-0: 15:08:00 WARNING unit.telegraf/0.install You are using pip version 8.1.1, however version 21.3.1 is available.
unit-telegraf-0: 15:08:00 WARNING unit.telegraf/0.install You should consider upgrading via the 'pip install --upgrade pip' command.
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install CacheControl requires Python '>=3.6' but the running Python is 3.5.2
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install Traceback (most recent call last):
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install File "/var/lib/juju/agents/unit-telegraf-0/charm/hooks/install", line 8, in <module>
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install basic.bootstrap_charm_deps()
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install File "lib/charms/layer/basic.py", line 214, in bootstrap_charm_deps
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install env=_get_subprocess_env())
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install raise CalledProcessError(retcode, cmd)
unit-telegraf-0: 15:08:19 WARNING unit.telegraf/0.install subprocess.CalledProcessError: Command '['/var/lib/juju/agents/unit-telegraf-0/.venv/bin/pip', 'install', '-U', '--force-reinstall', '--no-index', '--no-
cache-dir', '-f', 'wheelhouse', 'MarkupSafe==1.1.1', 'netaddr==0.7.19', 'six==1.16.0', 'pyaml==21.10.1', 'charms.reactive==1.5.0', 'PyYAML==5.2', 'insights-core==3.0.256', 'tenacity==5.0.3', 'msgpack==1.0.3', 'c
ertifi==2021.10.8', 'wheel==0.33.6', 'Tempita==0.4', 'charmhelpers==0.20.24', 'urllib3==1.24.3', 'lockfile==0.12.2', 'Jinja2==2.10.1', 'pbr==5.8.0', 'redis==3.3.11', 'chardet==3.0.4', 'requests==2.21.0', 'defuse
dxml==0.5.0', 'idna==2.8', 'CacheControl==0.12.10']' returned non-zero exit status 1
unit-telegraf-0: 15:08:19 ERROR juju.worker.uniter.operation hook "install" (via explicit, bespoke hook script) failed: exit status 1
```