How to source virtualenv activate in a Bash script

Solution 1:

When you source, you're loading the activate script into your active shell.

When you do it in a script, you load it into that shell which exits when your script finishes and you're back to your original, unactivated shell.

Your best option would be to do it in a function

activate () {
  . ../.env/bin/activate
}

or an alias

alias activate=". ../.env/bin/activate"

Hope this helps.

Solution 2:

You should call the bash script using source.

Here is an example:

#!/bin/bash
# Let's call this script venv.sh
source "<absolute_path_recommended_here>/.env/bin/activate"

On your shell just call it like that:

> source venv.sh

Or as @outmind suggested: (Note that this does not work with zsh)

> . venv.sh

There you go, the shell indication will be placed on your prompt.

Solution 3:

Although it doesn't add the "(.env)" prefix to the shell prompt, I found this script works as expected.

#!/bin/bash
script_dir=`dirname $0`
cd $script_dir
/bin/bash -c ". ../.env/bin/activate; exec /bin/bash -i"

e.g.

user@localhost:~/src$ which pip
/usr/local/bin/pip
user@localhost:~/src$ which python
/usr/bin/python
user@localhost:~/src$ ./shell
user@localhost:~/src$ which pip
~/.env/bin/pip
user@localhost:~/src$ which python
~/.env/bin/python
user@localhost:~/src$ exit
exit

Solution 4:

Sourcing runs shell commands in your current shell. When you source inside of a script like you are doing above, you are affecting the environment for that script, but when the script exits, the environment changes are undone, as they've effectively gone out of scope.

If your intent is to run shell commands in the virtualenv, you can do that in your script after sourcing the activate script. If your intent is to interact with a shell inside the virtualenv, then you can spawn a sub-shell inside your script which would inherit the environment.

Solution 5:

Here is the script that I use often. Run it as $ source script_name

#!/bin/bash -x
PWD=`pwd`
/usr/local/bin/virtualenv --python=python3 venv
echo $PWD
activate () {
    . $PWD/venv/bin/activate
}

activate