Handle resolver argument in pip-compile manager

[mkniewallner]

What would you like Renovate to be able to do?

pip-tools 6.8.0 added a --resolver argument that can take 2 values:

• backtracking, which makes pip-tools use pip's 2020 dependency resolver
• legacy (the default value for now), which makes pip-tools use pip's legacy resolver

Support for the legacy resolver will be deprecated and removed at some point (this is tracked in jazzband/pip-tools#1659), mostly because pip itself will remove support for the old resolver.

There are 2 main reasons for supporting this argument in Renovate:

• this is an argument that is now used by multiple projects
• once a new version of pip-tools defaulting to backtracking resolver is used by Renovate, users will be forced to use the new resolver, even if they explicitly set the value to legacy (or use an older version of pip-tools)

If you have any ideas on how this should be implemented, please tell us here.

The implementation should be rather straightforward, as Renovate should simply read --resolver argument and, if set, sanitise it to ensure that it is either legacy or backtracking (and avoid unsecure inputs), then pass it as an argument to pip-tools.

Is this a feature you are interested in implementing yourself?

Yes

[renovate-release]

🎉 This issue has been resolved in version 34.4.0 🎉

The release is available on:

• GitHub release
• 34.4.0

Your semantic-release bot 📦🚀