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mamba tries to install from default even so it's not a known channel #656

@michaelaye

Description

@michaelaye

On this machine, I wiped my miniconda and wanted to try miniforge instead, which I understand its only difference is to use the conda-forge channel by default?
I wanted to immediately take advantage of mamba's awesome speed, so added it first before installing anything else.
But I am again met with weird behavior by mamba trying to install from defaults even so that is not an allowed source channel anymore:

$ conda config --show-sources                                                                (py38)
==> /Users/klay6683/miniforge3/.condarc <==
channels:
  - conda-forge

==> /Users/klay6683/.condarc <==
channel_priority: strict

Here's my attempt to install jupyterlab:

$ mamba install jupyterlab                                                                   (py38)

                  __    __    __    __
                 /  \  /  \  /  \  /  \
                /    \/    \/    \/    \
███████████████/  /██/  /██/  /██/  /████████████████████████
              /  / \   / \   / \   / \  \____
             /  /   \_/   \_/   \_/   \    o \__,
            / _/                       \_____/  `
            |/
        ███╗   ███╗ █████╗ ███╗   ███╗██████╗  █████╗
        ████╗ ████║██╔══██╗████╗ ████║██╔══██╗██╔══██╗
        ██╔████╔██║███████║██╔████╔██║██████╔╝███████║
        ██║╚██╔╝██║██╔══██║██║╚██╔╝██║██╔══██╗██╔══██║
        ██║ ╚═╝ ██║██║  ██║██║ ╚═╝ ██║██████╔╝██║  ██║
        ╚═╝     ╚═╝╚═╝  ╚═╝╚═╝     ╚═╝╚═════╝ ╚═╝  ╚═╝

        mamba (0.7.6) supported by @QuantStack

        GitHub:  https://github.com/mamba-org/mamba
        Twitter: https://twitter.com/QuantStack

█████████████████████████████████████████████████████████████


Looking for: ['jupyterlab']

pkgs/main/osx-64         Using cache
pkgs/main/noarch         Using cache
pkgs/r/osx-64            Using cache
pkgs/r/noarch            Using cache
Transaction

  Prefix: /Users/klay6683/miniforge3/envs/py38

  Updating specs:

   - jupyterlab


  Package                Version  Build              Channel                Size
──────────────────────────────────────────────────────────────────────────────────
  Install:
──────────────────────────────────────────────────────────────────────────────────

  appnope                  0.1.2  py38hecd8cb5_1001  pkgs/main/osx-64      10 KB
  argon2-cffi             20.1.0  py38haf1e3a3_1     pkgs/main/osx-64      44 KB
  async_generator           1.10  py_0               pkgs/main/noarch      24 KB
  attrs                   20.3.0  pyhd3eb1b0_0       pkgs/main/noarch      43 KB
  backcall                 0.2.0  py_0               pkgs/main/noarch      15 KB
  bleach                   3.2.1  py_0               pkgs/main/noarch     112 KB
  decorator                4.4.2  py_0               pkgs/main/noarch      14 KB
  defusedxml               0.6.0  py_0               pkgs/main/noarch      23 KB
  entrypoints                0.3  py38_0             pkgs/main/osx-64      10 KB
  importlib-metadata       2.0.0  py_1               pkgs/main/noarch      35 KB
  importlib_metadata       2.0.0  1                  pkgs/main/noarch      11 KB
  ipykernel                5.3.4  py38h5ca1d4c_0     pkgs/main/osx-64     180 KB
  ipython                 7.19.0  py38h01d92e1_0     pkgs/main/osx-64     982 KB
  ipython_genutils         0.2.0  py38_0             pkgs/main/osx-64      39 KB
  jedi                    0.18.0  py38hecd8cb5_0     pkgs/main/osx-64     906 KB
  jinja2                  2.11.2  py_0               pkgs/main/noarch     103 KB
  json5                    0.9.5  py_0               pkgs/main/noarch      22 KB
  jsonschema               3.2.0  py38_1             pkgs/main/osx-64      91 KB
  jupyter_client           6.1.7  py_0               pkgs/main/noarch      77 KB
  jupyter_core             4.7.0  py38hecd8cb5_0     pkgs/main/osx-64      68 KB
  jupyterlab               2.2.6  py_0               pkgs/main/noarch       3 MB
  jupyterlab_pygments      0.1.2  py_0               pkgs/main/noarch       8 KB
  jupyterlab_server        1.2.0  py_0               pkgs/main/noarch      25 KB
  libsodium               1.0.18  h1de35cc_0         pkgs/main/osx-64     236 KB
  markupsafe               1.1.1  py38h1de35cc_1     pkgs/main/osx-64      21 KB
  mistune                  0.8.4  py38h1de35cc_1001  pkgs/main/osx-64      54 KB
  nbclient                 0.5.1  py_0               pkgs/main/noarch      58 KB
  nbconvert                6.0.7  py38_0             pkgs/main/osx-64     483 KB
  nbformat                 5.0.8  py_0               pkgs/main/noarch      88 KB
  nest-asyncio             1.4.3  pyhd3eb1b0_0       pkgs/main/noarch      11 KB
  notebook                 6.1.6  py38hecd8cb5_0     pkgs/main/osx-64       4 MB
  packaging                 20.8  pyhd3eb1b0_0       pkgs/main/noarch      36 KB
  pandoc                    2.11  h0dc7051_0         pkgs/main/osx-64      11 MB
  pandocfilters            1.4.3  py38hecd8cb5_1     pkgs/main/osx-64      14 KB
  parso                    0.7.0  py_0               pkgs/main/noarch      72 KB
  pexpect                  4.8.0  py38_1             pkgs/main/osx-64      77 KB
  pickleshare              0.7.5  py38_1001          pkgs/main/osx-64      13 KB
  prometheus_client        0.9.0  pyhd3eb1b0_0       pkgs/main/noarch      45 KB
  prompt-toolkit           3.0.8  py_0               pkgs/main/noarch     248 KB
  ptyprocess               0.7.0  pyhd3eb1b0_2       pkgs/main/noarch      17 KB
  pygments                 2.7.3  pyhd3eb1b0_0       pkgs/main/noarch     676 KB
  pyparsing                2.4.7  py_0               pkgs/main/noarch      65 KB
  pyrsistent              0.17.3  py38haf1e3a3_0     pkgs/main/osx-64      89 KB
  python-dateutil          2.8.1  py_0               pkgs/main/noarch     215 KB
  pyzmq                   20.0.0  py38h23ab428_1     pkgs/main/osx-64     405 KB
  send2trash               1.5.0  py38_0             pkgs/main/osx-64      17 KB
  terminado                0.9.2  py38hecd8cb5_0     pkgs/main/osx-64      25 KB
  testpath                 0.4.4  py_0               pkgs/main/noarch      82 KB
  tornado                    6.1  py38h9ed2024_0     pkgs/main/osx-64     585 KB
  traitlets                5.0.5  py_0               pkgs/main/noarch      83 KB
  wcwidth                  0.2.5  py_0               pkgs/main/noarch      29 KB
  webencodings             0.5.1  py38_1             pkgs/main/osx-64      20 KB
  zeromq                   4.3.3  hb1e8313_3         pkgs/main/osx-64     414 KB
  zipp                     3.4.0  pyhd3eb1b0_0       pkgs/main/noarch      15 KB

  Change:
──────────────────────────────────────────────────────────────────────────────────

  certifi              2020.12.5  py38h50d1736_1     installed
  certifi              2020.12.5  py38hecd8cb5_0     pkgs/main/osx-64     141 KB
  openssl                 1.1.1i  h35c211d_0         installed
  openssl                 1.1.1i  h9ed2024_0         pkgs/main/osx-64       2 MB

  Upgrade:
──────────────────────────────────────────────────────────────────────────────────

  ca-certificates      2020.12.5  h033912b_0         installed
  ca-certificates      2020.12.8  hecd8cb5_0         pkgs/main/osx-64     121 KB

  Summary:

  Install: 54 packages
  Change: 2 packages
  Upgrade: 1 packages

  Total download: 28 MB

──────────────────────────────────────────────────────────────────────────────────

Metadata

Item Version
mamba 0.7.6
Python 3.8
OS macOS 10.15.7 (Catalina)

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