convert a json dictionary into environment variables

jsonenv

#!/usr/bin/env python

# jsonenv reads a json object as input and produces
# escaped shell commands for setting environment vars

import json
import pipes
import sys

for k, v in json.load(sys.stdin).items():
    k = pipes.quote(k)
    v = pipes.quote(v)
    print "%s=%s export %s;" % (k, v, k)

Given x.json:

{
  "URL": "https://foo:bar@example.com/",
  "OTHER": "foo \" bar 'baz'"
}

This produces:

$ ./jsonenv <x.json 
URL=https://foo:bar@example.com/ export URL;
OTHER='foo " bar '"'"'baz'"'"'' export OTHER;

You can use it with the heroku api like this:

$ eval "$(curl -sn https://api.heroku.com/apps/myapp/config_vars|jsonenv)"

to use the config vars from myapp in your local shell.

This is useful, especially if gradually migrating code between Bash and Python.
Heads up though, this gist will only work with strings: not bool, int, or array.

thanks mate 😄

Very nice. Thanks!

@kr why not to export URL=...?

If you're attempting to use this with python3, all you need to do is change the line:

print "%s=%s export %s;" % (k, v, k)

to:

print("%s=%s export %s;" % (k, v, k))

Thanks @kr!

Thanks, can you help me how do i do the reverse way, convert bash config separated by = to give json string.
conf1='value1'
conf2='value2'

to produce json string
output={
'conf1':'value1',
'conf2':'value2'
}

@neps-in
did you figure out any way to do it?

pipes.quote is wrong for the env names. Env names can only contain word characters, so it should be instead sth like k = re.sub("[^a-zA-Z_0-9]+", "_", k)

Have you tried jq as an alternative?

$ jq -r '. | to_entries[] | "export \(.key)=\(@sh "\(.value)")"' ~/tmp/x.json
export URL='https://foo:bar@example.com/'
export OTHER='foo " bar '\''baz'\'''

That's not identical output to the Python above, but it is equivalent. (To encode single-quote (') characters, it uses <backslash>&apos; outside quotes instead of "'".)

Thanks

this should work without the need to paste code into cmdline again:

for k, v in json.load(open('local.settings.json')).items():
    os.environ[k] = v