Export environment variables parsed from YAML text file

Question

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=\2/ 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.

@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? — neurino, Sep 05 '19 at 13:05
What difference does that make? What part of it are you having trouble adapting to your case? — muru, Sep 05 '19 at 13:06
@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 — neurino, Sep 05 '19 at 13:11
`export "$name=$value"`, `printf -v "$name" "%s" "$value"`, `read "$name" <<<"$value"`, ... (Pick one) — muru, Sep 05 '19 at 13:15
I'm not near a PC, can't test an answer now. I can provide what I think should work — muru, Sep 05 '19 at 13:15

score 2 · Accepted Answer · answered Sep 05 '19 at 13:24

2

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=\2/ 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=\2/ p' app.yaml)

answered Sep 05 '19 at 13:24

muru

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'` – neurino Sep 05 '19 at 13:55
The `sed` command needs to eliminate the quotes there (the shell doesn't interpret quotes after variable expansion) for the first. – muru Sep 05 '19 at 13:57

1 Answers1