Using environment variables from remote servers

remote_env_vars.sh

#!/usr/bin/env bash

# A couple of handy bash functions that I have in my .bashrc:

# get_env uses ssh to copy an environment variable from a remote
# server to your current machine.  Example usage:
#
#   get_env SOME_VAR_NAME example.com
get_env () {
	VARNAME=$1
	SOURCE_SERVER=$2
	eval $(ssh $SOURCE_SERVER "env | grep '^$VARNAME='" | sed 's/.*/export &/')
}

# copy_env uses ssh to copy an environment variable from a remote
# server to the /etc/environment file on a different remote server.
# Example usage:
#
#   copy_env SOME_VAR_NAME source.example.com target.example.com
copy_env () {
	VARNAME=$1
	SOURCE_SERVER=$2
	TARGET_SERVER=$3
	if [ -z $(ssh $TARGET_SERVER "env | grep '^$VARNAME'") ]
	then
		echo Copying $VARNAME from $SOURCE_SERVER to $TARGET_SERVER
		VAR=$(ssh $SOURCE_SERVER "env | grep '^$VARNAME='")
		ssh $TARGET_SERVER "echo $VAR | sudo tee -a /etc/environment"
	else
		echo $VARNAME already exists on $TARGET_SERVER, skipping
	fi
}