create-ssh-agent-for-key

#!/bin/sh -e

if [ -z "$1" ] ; then echo "usage: create-ssh-agent-for-key keyname" ; exit 1 ; fi

KEYSTORE=/Volumes/key/ssh
KEYFILE=$( find "${KEYSTORE}/" -name "id_*-$1" | head -1)
echo "$KEYFILE"
FILE="${HOME}/.ssh/.ssh-agent-$1"

if [ ! -f "${KEYFILE}" ] ; then echo "no key at ${KEYFILE}" ; exit 1; fi

# By setting SSH_ASKPASS we provde ssh-agent with a program to run before
# it forwards a key onwards
# The ssh-askpass script uses the value of ${_SSH_KEYFILE} to indicate which
# key is being requested
# ${DISPLAY} is null'd since we're expected to provide a X11 client, not a script
_SSH_KEYFILE=${KEYFILE} SSH_ASKPASS=${HOME}/bin/ssh-askpass DISPLAY=dummy ssh-agent -P '' > "${FILE}"
# shellcheck disable=1090
. "${FILE}"