Create Ansible dynamic inventory from Puppet CA

gistfile1.sh

#!/bin/bash

/usr/bin/puppet cert list --all > /dev/null 2>&1
if [ $? -ne 0 ]
then
        echo "Puppet error"
        exit 1
fi

HOSTS="{\n\t\"all\":\n\t\t[\n"
FIRST_HOST="true"

while read hostname
do
        # this way i don't get a trailing comma
        if [ "${FIRST_HOST}" == "true" ]
        then
                HOSTS="${HOSTS}\t\t\t\"${hostname}\""
                unset FIRST_HOST
        else
                HOSTS="${HOSTS}, \"${hostname}\""
        fi
# can't use command | while because of subshell and loss of variable
done < <(/usr/bin/puppet cert list --all | egrep "^\+.*" | awk -F"\"" '{ print $2 }' | grep "example.com")

HOSTS="${HOSTS}\n\t\t]\n}"
echo -e "${HOSTS}"