netrc_credentials

#!/usr/bin/env bash
set -eo pipefail

##
## extract .netrc creds inspired by https://bugs.launchpad.net/python-jenkins/+bug/941400
##
## usage:
##   netrc_credentials example.com          # // 'myuser mypassword'
##   netrc_credentials example.com username # // 'myuser'
##   netrc_credentials example.com password # // 'mypassword'
##

: ${1:?'domain must be provided via positional argument #1'}

username_password="$(echo -e "import netrc\nusername, _, password = netrc.netrc().authenticators('$1')\nprint '{} {}'.format(username, password)" | python 2>/dev/null)"

if [[ $2 == u* ]]; then
  awk '{print $1}' <<< "${username_password}"
elif [[ $2 == p* ]]; then
  awk '{print $2}' <<< "${username_password}"
else
  echo "${username_password}"
fi