Support Local Python Installations

[mitsuhiko]

On the version of rye I published there is currently no support for local Python installations. This is pretty much intentional because I really want the experience to not involve manually downloading Pythons. However there are also situations where this is necessary. In the original implementation I had, the way non automatically managed Python installations worked was with registering them.

Link a Python:

ln -s /path/to/python ~/.rye/py/my-dst@3.11.0

And to pick a default distribution for what gets picked up when you write 3.11.0 another symlink does:

ln -s ~/.rye/py/my-dist@3.11.0 ~/.rye/py/3.11.0

I however never really fleshed out the details and it was pretty brittle. In particular the only way I found to reliably pin a project to pypy for instance was to write pypy@madeupversion into .python-version which obviously is not very portable.

Remaining tasks:

• enable rye to work with a local toolchain entirely (eg: make the self venv work with a supplied one)
• find a good way to pin to specific installations without throwing stuff into the .python-version file that other toolchains cannot work with

[WhyNotHugo]

rustup's implementation might be a good reference here:

rustup toolchain link system /usr
rustup default system

I guess making the default configurable is enough to cover this issue; I can already register the system one.

[cnpryer]

find a good way to pin to specific installations without throwing stuff into the .python-version file that other toolchains cannot work with

What about doing something like

[tool.rye]
managed = true
standalone-toolchain = false

With a predictable resolution strategy for this setting. Could take inspiration from py.

[mitsuhiko]

Closing this for now. It's possible now to register custom toolchains, for improvements in the handling individual tickets should be opened.