setup_conda.sh

#!/usr/bin/env bash
###
# NB: You probably don't want this gist any more.
#     Instead, use this version from `fastsetup`:
#     https://github.com/fastai/fastsetup/blob/master/setup-conda.sh
###

set -e

cd

case "$OSTYPE" in
  darwin*)  DOWNLOAD=https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh; RC_FILE=.bash_profile ;;
  linux*)   DOWNLOAD=https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh; RC_FILE=.bashrc  ;;
  *)        echo "unknown: $OSTYPE" ;;
esac

case "$SHELL" in
  /bin/zsh*)   SHELL_NAME=zsh; RC_FILE=.zshrc ;;
  /bin/bash*)  SHELL_NAME=bash ;;
  /usr/local/bin/fish*) SHELL_NAME=fish ;;
  *)        echo "unknown: $SHELL" ;;
esac

cat << EOF > .condarc
channels:
  - fastai
  - pytorch
  - defaults
channel_priority: strict
EOF

wget $DOWNLOAD
bash Miniconda3-latest*.sh -b
~/miniconda3/bin/conda init $SHELL_NAME
rm Miniconda3-latest*.sh

perl -n  -e 'print if     />>> conda/../<<< conda/' $RCFILE > .condainit
perl -ni -e 'print unless />>> conda/../<<< conda/' $RCFILE
echo source ~/.condainit >> $RCFILE
source ~/.condainit

NB: You probably don't want this gist any more. Instead, use this version from fastsetup:

https://github.com/fastai/fastsetup/blob/master/setup-conda.sh

To install fastai, once you've run this, run:

conda install fastai

NB: If you've installed Anaconda or miniconda before, and you want to start with a fresh install, remove (or rename) your existing ~/anaconda3 or ~/miniconda3 directory before you run this script.

I'm using fish shell (on mac) which is unfortunately not compatible with bash syntax, so instead of sourcing it, you need to start the setup with: bash setup_conda.sh. Then you will want to add the following line to the $SHELL case switch: /usr/local/bin/fish*) SHELL_NAME=fish ;; (for me fish is at /usr/local/bin/fish, check your location by running echo $SHELL). This ensures that later the conda init line will be invoked with fish as last param.

The .bashrc lines are not doing any harm on a fish system (don't have a .bashrc so .condainit will be empty and sourcing it will do nothing)

Finally I had to change the last line to conda install mamba -c conda-forge (as specified in mamba's installation guide), should not be a fish specific thing though as far as i can tell? Without specyfing conda-forge as a channel that installation failed on my machine.

And when you say "to install fastai with mamba…run" you are I think forgetting to tell users to alias conda to mamba (i know you did on twitter, but people might not have seen that coming here).

Thanks for sharing Jeremy! I had an error "setup_conda.sh: line 34: source: .condainit: file not found." My OS is Centos 7. I was able to fix the issue by switching the command to "source ~/.condainit"

Just a quick note for anyone using Ubuntu in WSL2, don't delete your ~/anaconda3 folder if you want to start fresh. Everything is broken now :(.

It seems like a great idea for managing environments. But the script seems not to be working anymore. After the miniconda install (seemingly after running the condainit script it creates), it stops, saying:
==> For changes to take effect, close and re-open your current shell. <==
Also, if I then try to run conda install -y mamba it appears not to find it in the provided channels (the current documentation recommends conda-forge?)

Leaving this here just in case: I finally added the channel manually: conda config --append channels conda-forge, after which I was able to run
conda install -y mamba

mamba is no longer needed -- I've now updated the gist to reflect that. I've also added a link to a somewhat more official version that's in fastsetup.