cachedpass: Script to cache a password in gpg-agent

cachedpass.sh

@@ -0,0 +1,59 @@
+#!/bin/sh
+
+
+PROMPT='Password:'
+
+usage() {
+	printf '%s: key [description]\n' "${0##*/}"
+}
+
+
+escape() {
+	printf '%s' "${1}" | tr ' ' '+'
+}
+
+
+key="${1}"
+description="${2}"
+
+if [ -z "${key}" ]; then
+	usage >&2
+	exit 2
+elif [ "${key}" = '-h' ] || [ "${key}" = '--help' ]; then
+	usage
+	exit 0
+fi
+if [ -z "${description}" ]; then
+	description=$(printf 'Enter the password for %s' "${key}")
+fi
+
+
+sleep .125
+umask 0077
+
+agentpipe=$(mktemp -u)
+mkfifo ${agentpipe}
+trap 'rm ${agentpipe}' EXIT
+
+printf 'GET_PASSPHRASE --data cachedpass:%s X %s %s' \
+	"$(escape "${key}")" \
+	"${PROMPT}" \
+	"$(escape "${description}")" \
+	| gpg-connect-agent > ${agentpipe} &
+while read msg args; do
+	case "${msg}" in
+	ERR)
+		printf '%s\n' "${args#* }" >&2
+		exit 1
+		;;
+	OK)
+		;;
+	D)
+		printf '%s' "${args}" | xclip -i -l 1 -sel clip
+		;;
+	*)
+		printf 'Unexpected response from gpg-agent: %s %s' \
+			"${msg}" "${args}" >&2
+		exit 1
+	esac
+done < ${agentpipe}