Export environment variables parsed from YAML text file [duplicate]

Question

This question already has answers here:

In bash, read after a pipe is not setting values (2 answers)

Closed 6 years ago.

I have some environment variables declared in a YAML file like:

runtime: python37
env_variables:
 API_URL: 'https://fake.api.com/'
 API_USERNAME: '[email protected]'
 API_PASSWORD: 'Passwooord'

I would like to export these to environment variables with a script, I can echo the correct syntax but I'm still unable to export them.

sed -nr '/env_variables:/,$ s/ ([A-Z_]+): (.*)/1円=2円/ p' app.yaml | while read assign; do echo $assign; done

This is different that this as in my case the variable name is passed trough the pipe as well.

• neurino: @muru in my case you also have variable names in the pipe, which is a step further from read a b < <(echo 1 2 3 4 5) where a and b are after the pipe. Could you please post a working case with my example?
• muru: What difference does that make? What part of it are you having trouble adapting to your case?
• neurino: @muru the part where I assign to a variable whose name is in another variable — I'd be happy to accept your answer straight away if you post it below
• muru: export "$name=$value", printf -v "$name" "%s" "$value", read "$name" <<<"$value", ... (Pick one)
• muru: I'm not near a PC, can't test an answer now. I can provide what I think should work

Answer 1

Assuming the sed command correctly outputs lines of the form var=value, you can do:

while read assign; do
 export "$assign"; 
done < <(sed -nr '/env_variables:/,$ s/ ([A-Z_]+): (.*)/1円=2円/ p' app.yaml)

Or, if you don't need to export, and the input is reasonably safe (no shell syntax),

. <(sed -nr '/env_variables:/,$ s/ ([A-Z_]+): (.*)/1円=2円/ p' app.yaml)

• neurino: Thanks, the second works like a charm! The first works somehow, keeping quotes in the value of the variable, e.g. echo $API_PASSWORD prints 'Passwooord'
• muru: The sed command needs to eliminate the quotes there (the shell doesn't interpret quotes after variable expansion) for the first.