_ssh

#!/bin/bash

#/ NAME
#/     _ssh -- ssh library for controlmaster, jails
#/
#/ SYNOPSIS
#/     require ssh

function ssh_start {
  local hst_remote="$1"; shift
  local id_session="$1"; shift
  local pth_control="$HOME/.ssh/master-%r@%h:%p-$id_session"

  ssh -n -o ControlPath=$pth_control -o ControlMaster=auto -N -f $hst_remote
  ssh -n -o ControlPath=$pth_control -O check $hst_remote
}

function ssh_stop {
  local hst_remote="$1"; shift
  local id_session="$1"; shift
  local pth_control="$HOME/.ssh/master-%r@%h:%p-$id_session"

  ssh -n -o ControlPath=$pth_control -O exit $hst_remote
}

function ssh_run {
  local hst_remote="$1"; shift
  local id_session="$1"; shift
  local pth_control="$HOME/.ssh/master-%r@%h:%p-$id_session"

  ssh -o ControlPath=$pth_control $hst_remote "$@"
}

function ssh_session {

  local id_session="$(random_str)"
  local pth_control="$HOME/.ssh/master-%r@%h:%p-$id_session"
  
  local hst_remote
  for hst_remote in "$@"; do
    ssh_start "$hst_remote" "$id_session" &
  done | cat &

  local cmd_ssh="$(which ssh)"

  local tmp_ssh="$(mktemp -d -t XXXXXXXXX)"
  mkdir "$tmp_ssh/bin"

  local dollar='$'
  cat > "$tmp_ssh/bin/ssh" <<EOF
#!/bin/bash
exec $cmd_ssh -o ControlPath=$pth_control "${dollar}@"
EOF
  chmod 755 $tmp_ssh/bin/ssh

  export PATH_OVERRIDE="$tmp_ssh/bin"

  export SHLVL_NAME="ssh"
  bash
  unset SHLVL_NAME

  rm -rf $tmp_ssh
  for hst_remote in "$@"; do
    ssh_stop "$hst_remote" "$id_session" || true &
  done | cat
  wait
}