rsshfs

#!/bin/bash
# Reverse sshfs (GPLv3)
#
# Usage:
#   rsshfs <localpath> <remotehost>:<remotepath> [-o ro]
#   rsshfs -u <remotehost>:<remotepath>
#
# Romain Vimont (®om) <rom@rom1v.com>

quote() {
    [[ $# != 0 ]] && printf '%q ' "$@" | sed 's/.$//'
}

if [[ $# -lt 2 ]]
then
    printf "Error: missing parameters\n" >&2
    printf "Usage:\n" >&2
    printf "  $0 <localpath> <remotehost>:<remotepath> [-o ro]\n" >&2
    printf "  $0 -u <remotehost>:<remotepath>\n" >&2
    exit 1;
fi

lpath="$1"
IFS=: read rhost rpath <<< "$2"
qrpath="$(quote "$rpath")"

if [[ "-u" = "$lpath" ]]
then
    printf "Unmounting '$rhost:$rpath'...\n"
    ssh "$rhost" fusermount -u "$qrpath"
else
    qlpath=$(quote "$lpath")
    shift 2 # remove the two main pamars to keep the remainder
    # warning: the array will be flatten to a string anyway
    qall=$(quote "$@")

    printf "Mounting '$lpath' on '$rhost:$rpath'...\n"
    fifo=/tmp/rsshfs-$$
    rm -f "$fifo"
    mkfifo -m600 "$fifo" &&
    < "$fifo" /usr/lib/openssh/sftp-server |
      ssh "$rhost" sshfs -o slave ":$qlpath" "$qrpath" "$qall" > "$fifo"
    rm "$fifo"
fi