mount AFP share with keychain password

mount_afp.sh

#!/bin/sh
#
# e.g. mount_afp.sh 192.168.xx.xx files cocoa
#
SERVER="$1"
SHARE_NAME="$2"
USER_NAME="$3"
MOUNT_DIR="/Volumes/$SHARE_NAME"
if [ -z "$1" -o -z "$2" ]; then
    echo "Usage: $0 <SERVER> <SHARE_NAME> [USER]\n"
    exit 1
fi
if [ -d "$MOUNT_DIR" ]; then
    mount  | grep --colour=always "$MOUNT_DIR"
    if [ $? -ne 0 ] ; then
        echo "ERROR: $MOUNT_DIR already exists" >&2
        exit 1
    else
        exit 0
    fi
fi
mkdir "/Volumes/$2"

#
# get password from keychain, then dequote
#
PASS_QUOTED=`security find-internet-password -gs "$1" 2>&1 | sed -n 's/password: \(.*\)/\1/p'`
PASS=`echo "$PASS_QUOTED" | sed -e 's/^"//' -e 's/"$//'`
PASS_PARAM=""
if [ -z "$PASS" ]; then
    echo "NOTICE: no password found for $1" >&2
else
    PASS_PARAM=":$PASS"
fi

#
#
#
if [ -z "$USER_NAME" ]; then
    USER_NAME=`whoami`
    echo "NOTICE: using local user name: $USER_NAME" >&2
fi

echo "mounting afp://$USER_NAME@$SERVER ==> $MOUNT_DIR" >&2
mount_afp "afp://${USER_NAME}${PASS_PARAM}@${SERVER}/$SHARE_NAME" "$MOUNT_DIR"
exit $?