dev/remsh

#!/usr/bin/env bash
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

# Cookies can be set in 3 different ways:
# - Use `dev/run` script to pass cookies:
#     `dev/run --erlang-cookie=crumbles`
# - Use `vm.args` config file in rel/overlay/etc to set cookies:
#     `-setcookie crumbles`
# - Use cookies from the `.erlang.cookie` file in the user's home directory.

# NOTE: If more than 2 cookies are passed to node, node will ignore them
#       and use the default cookies from `~/.erlang.cookie`.

if [ -z "$NODE" ]; then
  if [ -z "$1" ]; then
    NODE=1
  else
    NODE=$1
  fi
fi

if [ -z "$HOST" ]; then
  HOST="127.0.0.1"
fi

NAME="remsh$$@$HOST"
NODE="node$NODE@$HOST"

COOKIE_PY=$(ps ax |
  grep -E "dev/run .* --erlang-cookie=" |
  sed -n "s/.*--erlang-cookie=\([a-zA-Z0-9!@%^&*()_+-=(){}<>,;.:?/|]*\).*/\1/p")

DIR="$(
  cd "${0%/*}" 2>/dev/null || exit
  echo "$PWD"/../rel/overlay/etc/
)"
COOKIE_VM=$(grep "^-setcookie" "$DIR"/vm.args |
  sed -n "s/-setcookie *\([a-zA-Z0-9!@%^&*()_+-=(){}<>,;.:?/|]*\).*/\1/p")

if [[ -n "$COOKIE_PY" && -z "$COOKIE_VM" ]]; then
  erl -name "$NAME" -remsh "$NODE" -hidden -setcookie "$COOKIE_PY"
elif [[ -z "$COOKIE_PY" && $(echo "$COOKIE_VM" | wc -l) -eq 1 ]]; then
  erl -name "$NAME" -remsh "$NODE" -hidden -setcookie "$COOKIE_VM"
else
  erl -name "$NAME" -remsh "$NODE" -hidden
fi

erl -name "$NAME" -remsh "$NODE" -hidden