Script to grab credentials from gpg encrypted file and run clj with them

cljpg.sh

#!/usr/bin/env bash

# cljgp is a script for decrypting a credentials file with environment
# variables and set them on the clj process.  Combine this with the
# ~/.m2/settings.xml file and tell maven to use your environment vars:
# https://maven.apache.org/settings.html.
#
# Credentials file should contain:
# MY_USER=someuser
# MY_PASS=somepass
#
# Settings.xml file should then contain:
# <username>${env.MY_USER}</username>
# <password>${env.MY_PASS}</password>

ENCRYPTED_CREDENTIALS=${HOME}/.clojure/credentials.gpg

neededutils=( gpg clj rlwrap )
for UTIL in ${neededutils[@]} ; do
  if [ ! -x "`which $UTIL`" ] ; then
    echo "$0 Failure: Could not find $UTIL in \$PATH"
    exit 2
  fi
done

# Check if credential file exists
if [ ! -e ${ENCRYPTED_CREDENTIALS} ]; then
  echo "Missing credential file at ${ENCRYPTED_CREDENTIALS}"
  exit 1
fi

# Decrypt credentials file and source it
CREDENTIALS=$(gpg -d ${ENCRYPTED_CREDENTIALS} 2> /dev/null)
if [ $? -ne 0 ]; then
  echo "Could not decrypt credential file at ${ENCRYPTED_CREDENTIALS}"
  exit 1
fi

echo "Running clj with environment variables from ${ENCRYPTED_CREDENTIALS}"
env $(echo $CREDENTIALS | grep -v "^#" | xargs) clj $@

Edit: Add this as a shell script in your ~/bin/ folder under some name like cljpg and make it executable.
Add an alias from clj to cljpg if you want to shadow the original clj command.

Original comment: Put this in your ~/.bash_aliases file, configure the ~/.m2/settings.xml file, and you are good to go.