Installing the latest ska3-flight, then replacing it by ska3-flight-latest should be a no-op.

[javierggt]

Description

In the answer I gave Josh in analysis-coding, I did the trick of installing ska3-flight-latest and removing ska3-flight. Without the --force option, conda tries to do this:

The following packages will be DOWNGRADED:

  astropy                                5.0-py38h7588534_0 --> 4.2.1-py38he3068b8_1
  blas                                         1.1-openblas --> 1.0-mkl
  numexpr                              2.8.1-py38h9c3cb84_0 --> 2.7.1-py38hce01a72_0
  numpy                               1.20.3-py38h0fa1045_0 --> 1.18.5-py38h1da2735_0
  numpy-base                          1.20.3-py38hbbe2e76_0 --> 1.18.5-py38h3304bdc_0
  scipy                                1.7.3-py38hfb86763_0 --> 1.5.0-py38hbab996c_0

I think this is a bug.

To Reproduce

note that the channels are always set:

conda create -n star-app --override-channels -c https://icxc.cfa.harvard.edu/aspect/ska3-conda/flight ska3-flight ska3-perl
conda activate star-app
conda install -y --override-channels -c https://icxc.cfa.harvard.edu/aspect/ska3-conda/flight ska3-flight-latest
conda uninstall -y --override-channels -c https://icxc.cfa.harvard.edu/aspect/ska3-conda/flight ska3-flight

Expected behavior
Installing the latest ska3-flight, then replacing it by ska3-flight-latest should be a no-op.

[javierggt]

Also, installing ska3-core-latest, then installing ska3-core should also be a no-op.

I was looking at this now, and currently the following packages are installed by ska3-core and not ska3-core-latest:

  - astroid
  - configobj
  - dill
  - ipyparallel
  - isort
  - mccabe
  - nose
  - paramiko
  - pytables
  - qtconsole
  - tomlkit

Usually this happens because they are added as dependence of some ska3-flight package. The following packages list them in their recipe (the ones in bold do not actually import them directly, so the dependency might be stale).

• configobj: kadi
• ipyparallel: cheta
• nose: ska_numpy
• paramiko: ska_shell
• pytables: a bunch of them
• qtconsole: aca_view

I don't know who pulled astroid, isort, dill, mccabe and tomlkit. I might have added isort by hand?

[jeanconn]

paramiko is required by ska_ftp.

[jeanconn]

nose could probably be removed in a future release as ska_numpy's tests have since been updated.