Mamba solver is ignored when using mamba env update

[tadeu]

First, I'd like to say that Mamba is an awesome initiative, I've tried mamba 0.0.7, and it worked very well with mamba install and mamba create, sometimes making the solver 15x faster, with no other apparent differences from the results of conda commands!

conda env update is an important feature, we depend on it to update our environments from environment.yml files, especially because of the --prune flag, that guarantees that the env is an exact match of the spec defined in environment.yml (removing extra packages). I've tried to use mamba env update, but it seems to have no effect in the performance this case (looks like it's using conda solver).

[wolfv]

Hi @tadeu,

indeed, we haven't put in the work to make mamba env update work and it's falling back to conda for this command (also the --prune flag has not yet been taken care of). It will be a little bit of work ... we need to figure out what arguments to pass to libsolv to make it happen :)

[wolfv]

I have just made a PR #327 that fixes this. Thanks @jaimergp for insisting :)

[ahgraber]

Does #327 enable the --prune flag, or is #688 still a valid / outstanding request?