#!/bin/sh

# We can figure out the password for the key based on $1
# which is in the following form:
#	Enter passphrase for key 'path/to/key':
# The point is to retrieve the path where the filename is the name of
# the key.
# Then we can construct the path for pass and get the password.
key="$(printf '%s\n' "$1" |
	cut -f 2 -d \' |
	awk -F '/' '{print $NF}')"
pass="keys/$(hostname)/ssh/$key"

# optional: add key to running ssh-agent
keyadd "$key" &

pass show "$pass" | head -n 1