Install blocked by old version of `pip`

[jneo8]

The install hook fails due to an old version of pip.

When installing "fabric" via pip, the dependency "cryptography" fails with a message stating the version of pip is too old and a traceback as follows: 0

    Traceback (most recent call last):       File "", line 1, in       File "/var/lib/pip/pip-build-y4ldt5j2/cryptography/setup.py", line 14, in         from setuptools_rust import RustExtension     ModuleNotFoundError: No module named 'setuptools_rust'

The install hook succeeds when the modification for bug 1968366 is applied alongside an upgrade of pip as follows: $ python -m pip install --upgrade pip

If possible, the charm needs to ensure the supported version of pip is available for the dependencies it intends to install during the install hook.

---

Imported from Launchpad using lp2gh.

• date created: 2022-04-08T18:08:52Z

• owner: jplettman

• assignee: rgildein

• the launchpad url

[jneo8]

(by vultaire) If this is a charmcraft-built charm, this is easy to fix. I've done this for a few charms already.

See here: https://discourse.charmhub.io/t/install-or-update-python-packages-before-packing-a-charm/5158

[jneo8]

(by raychan96) For which release are you seeing this problem? I saw bionic is having similar problem: missing rustc.

[jneo8]

(by valexby) Hi Ray,

The series are Bionic, duplicity is of version 0.7.17-0ubuntu1.1 and the charm is revision 12.

Hope that helps.

[jneo8]

(by rgildein) Hi Paul (@vultaire) we could not use charm-python-packages, since this is reactive charm and we are using reactive plugin.

However we potentially could use build-packages and define fabric (cryptography) in wheelhouse.txt instead of installing in with layers. However I could not make it work, so for now I proposed only add pkg-config and disabling include_system_packages.