#!/usr/bin/env bash 

set -eu

synopsis() {
	cat << EOF
Usage : `basename $0` [-h] [option...] [login@]system:[path] mountpoint 
EOF
}

help() {
	cat << EOF

`basename $0` monte un répertoire du système virtuel dans un répertoire de l'hôte.

Remarque : nécessite fuse et sshfs.
   
`synopsis`

-h      : affiche cette aide

Les options autorisées sont celles de sshfs(1). 

Exemple :

   mkdir /tmp/d
   vdn-sshfs test@vm-1: /tmp/d # le HOME de test sur vm-1 est monté dans /tmp/d 
   
   # Pour démonter
   fusermount -u /tmp/d

EOF
}

usage() {
	synopsis
	exit 1
}


args() {
	OPTS=""
	while [ $# -ne 0 ]; do
		reg='^-'
		if [[ "$1" =~ $reg ]]; then
			OPTS="$OPTS $1"
			case "$1" in
				-h) help; exit 0;;
				-b|-c|-D|-e|-F|-I|-i|-L|-l|-m|-O|-o|-p|-R|-S|-w)
				OPTS="$OPTS $2"; shift;;
			esac
			shift
		else
			break
		fi
	done

	LOGIN=""
	DIR=""
	GUEST_NAME="$1"

	if echo $1 | grep -q -- '@'; then
		LOGIN=`echo $1 | cut -d '@' -f 1`@
		GUEST_NAME=`echo $1 | cut -d '@' -f 2`

		if ! echo $GUEST_NAME | grep -q -- ':'; then
			usage
		fi

		DIR=$(echo $GUEST_NAME | cut -d ':' -f 2)
		GUEST_NAME=$(echo $GUEST_NAME | cut -d ':' -f 1)
	fi

	shift

	set +u
	MOUNT_DIR="$1"
	[ -z "$MOUNT_DIR" -o -n "$2" ] && usage
	set -u
}

# Programme principal

GUEST_OWNER=$USER

VDN_PATH=$(readlink -f $(dirname $0)/..); . $VDN_PATH/bin/functions.sh

args "$@"

#if [ $GUEST_NAME = nested ]; then
#	SSH_REDIR_PORT=2222
#else
	[ ! -e $TMPDIR/vdn-$GUEST_NAME-$GUEST_OWNER-redirs ] &&
		error "Impossible de joindre $GUEST_NAME"

	SSH_REDIR_PORT=`cat $TMPDIR/vdn-$GUEST_NAME-$GUEST_OWNER-redirs | \
		sed -rne 's/^tcp:([0-9]+):22(:|$).*$/\1/p'`

	[ -z "$SSH_REDIR_PORT" ] && error "Impossible de joindre $GUEST_NAME"
#fi

# No master mode when X11 forwarding
echo $OPTS | grep -q -- -X && {
	#echo "Workaround X11 forwarding"  >&2
	SSH_GUEST_MASTER=0
}

SSH_MASTER=""
[ $SSH_GUEST_MASTER = 1 ] && {
	sshGuestControlMaster
	SSH_MASTER="$SSH_OPTS -o ControlPersist=10m -o ControlMaster=auto,ControlPath=$TMPDIR/vdn-$GUEST_NAME-$GUEST_OWNER-guest-%r@%h:%p"
}


set +e

#ssh $SSH_MASTER $SSH_OPTS -o ServerAliveInterval=5  $OPTS -p $SSH_REDIR_PORT ${LOGIN}localhost "$COMMAND" 
sshfs ${LOGIN}localhost:$DIR $MOUNT_DIR $SSH_MASTER $SSH_OPTS -o ServerAliveInterval=5  $OPTS -p $SSH_REDIR_PORT