GPG password manager

pwmgr.sh

#!/bin/bash

# Where to store passwords
DATAFILE="./pwmgr_data.gpg"

# Your GPG key
RECIPIENT="xa@xomg.net"

# Command used to generate passwords
# (pwgen is nice)
GENCMD="pwgen -sy1 -n 64"

function help {
	echo "-- GPG Password Manager --"
	echo "usage: pwmgr.sh <action> <key>"
	echo "action: get : print password to stdout"
	echo "        set : change password with stdin"
	echo "        gen : generate a random password"
	echo "        new : create a new empty password file (erase)"
	echo "        help: this text"
	echo "made by Xa <xa@xomg.net>"
}


function gpg_readfile {
	gpg --decrypt $DATAFILE
}
function gpg_readkey {
	gpg_readfile | grep -G "^$1:" | cut -d":" -f 2
}
function gpg_writefile {
	content=`cat /dev/stdin`
	echo "$content" | gpg --encrypt --recipient $RECIPIENT > $DATAFILE
}
function gpg_writekey {
	file=`gpg_readfile`
	keyline=`echo $file | grep -G \"^$1:\"`
	if [ "$keyline" != "" ]; then
		echo $file | sed "s/^$1\:.+$/$1:$2/" | gpg_writefile
	else
		(echo "$file" && echo "$1:$2") | gpg_writefile
	fi
}
function gpg_append {
	(gpg_readfile && echo "$1:$2") | gpg_writefile
}


function a_get {
	gpg_readkey $1
}
function a_set {
	read passwd
	gpg_writekey $1 $passwd
}
function a_gen {
	gpg_writekey $1 `$GENCMD`
}
function a_new {
	touch $DATAFILE
	cp $DATAFILE $DATAFILE.bak
	echo "" | gpg_writefile
}

if [ -z $1 ] || ( ( [ "$1" != "new" ] && [ "$1" != "help" ] ) && [ -z $2 ] ); then
	help
	exit
fi

case "$1" in
	"get")
		a_get $2;;
	"set")
		a_set $2;;
	"gen")
		a_gen $2;;
	"new")
		a_new;;
	"help")
		help;;
	*)
		help;;
esac