can i use mamba with constructor?

[hmaarrfk]

I've been having some issues solving environments with constructor. It used to work but it seems that with pypy things are struggling.

Is there a way to use mamba with constructor? I saw https://github.com/mamba-org/monstructor but it seems to be rather old.

I also saw that you can install the libmamba solver somehow?

Would that work with constructor?

[chrisburr]

You can use constructor --conda-exe=/path/to/micromamba ... to use mamba at install time. Note this requires recent constructor and micromamba versions.

To use libmamba for solving the environment in constructor itself I suspect conda config --set experimental_solver libmamba will work (conda 4.12+) but I haven't tried.

[hmaarrfk]

I think I'll have to try that. I also noticed i probably ah e to use a non-base environment as well. There is a note that experimental solvers are disabled in base

[chrisburr]

The environment you use shouldn't matter. I'm not sure if the experimental solvers will be used but if not this will probably need to be the place that needs to be patched to enable them: https://github.com/conda/constructor/blob/master/constructor/conda_interface.py#L56-L65

[hmaarrfk]

Thanks, with a bit of patching it helped me troubleshoot.

Your stuff is great

[hmaarrfk]

ill try to submit a patch to construcgor.

[hmaarrfk]

the issue is that one would want to import _get_solver_class but it is a private method.

https://github.com/conda/conda/blob/c92b2062e34764e4ff0ac69b975022af98762d50/conda/core/solve.py#L42

calling that helped me.

[raphaeljolivet]

Hi, What is the status for this ?
Did you manage to get constructor use libmamba as a solver ?
How ?

Thanks for your help.

[hmaarrfk]

I had to patch things up a bit since constructor didn't use the new solver mechanics.