Deploy a local filesystem to a remote host

deployfs

#!/usr/bin/env sh

# Author: Tyler Miller (@tmillr) ([email protected])

# Mount a local directory to a remote destination (give a remote host access
# to a local directory via sshfs via sftp). Requires mkfifo on local host.
# Requires sshfs to be installed in PATH on remote host. Might not work on
# Windows.

# Environment Variables
#   SSHFS_PATH    path to sshfs on remote host (optional)
#   SFTPSRV_PATH  path to sftp-server on local host (optional)

# Synopsis
#   deployfs desthost destmnt [localdir]

# localdir is optional and defaults to sharing the current directory.

if [ $# -eq 0 ]; then
  cat <<\EOF
Mount a local directory to a remote destination.
Give a remote host access to a local directory via sshfs via sftp.
EOF
  echo "usage: deployfs desthost destmnt [localdir]"
  exit 2
fi

sshfs="${SSHFS_PATH:-sshfs}"
sftp="${SFTPSRV_PATH:-"$(which sftp-server 2>/dev/null)"}"

case "$sftp" in
  *[![:space:]]*) : ;;
  *)
    sftp="$(find /usr -name 'sftp-server' -perm +u+x \( -type f -or -type l \) 2>/dev/null)"
    sftp="${sftp%%"$(printf '[\n\r]')"*}"
    [ -n "$sftp" ] || {
      echo 'could not find sftp-server bin, set SFTPSRV_PATH' >&2
      exit 1
    }
    ;;
esac

dest="$1"
remote_mnt_point="$2"
local_dir_to_share=":$3"
tmpd="$TMPDIR"
[ -d "$tmpd" ] || tmpd="$TMP"
[ -d "$tmpd" ] || tmpd="/tmp"

fifo=0
while [ -e "${tmpd}/${fifo}" ]; do
  : $((fifo++))
done

fifo="${tmpd}/${fifo}"

script="
  mkdir -p \"$remote_mnt_point\"
  trap 'rm -d \"$remote_mnt_point\"' EXIT
  \"$sshfs\" \"$local_dir_to_share\" \"$remote_mnt_point\" -o passive
"

mkfifo "$fifo"
trap "rm $fifo" EXIT
"$sftp" <"$fifo" | ssh "$dest" "$script" >"$fifo"