rel/overlay/bin/remsh

#!/bin/sh

# 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.

canonical_readlink ()
  {
  cd $(dirname $1);
  FILE=$(basename $1);
  if [ -h "$FILE" ]; then
    canonical_readlink $(readlink $FILE);
  else
    echo "$(pwd -P)";
  fi
}
COUCHDB_BIN_DIR=$(canonical_readlink $0)
ERTS_BIN_DIR=$COUCHDB_BIN_DIR/../
ROOTDIR=${ERTS_BIN_DIR%/*}
START_ERL=$(cat "$ROOTDIR/releases/start_erl.data")
ERTS_VSN=${START_ERL% *}
APP_VSN=${START_ERL#* }
BINDIR=$ROOTDIR/erts-$ERTS_VSN/bin

PROGNAME=${0##*/}
VERBOSE=""
NODE="couchdb@127.0.0.1"
LHOST=127.0.0.1
VM_ARGS=$COUCHDB_BIN_DIR/../etc/vm.args

# If present, extract cookie from ERL_FLAGS
# This is used by the CouchDB Dockerfile and Helm chart
COOKIE=$(echo "$ERL_FLAGS" | sed 's/^.*setcookie \([^ ][^ ]*\).*$/\1/g')
if test -f "$VM_ARGS"; then
# else attempt to extract from vm.args
  VM_ARGS_COOKIE=$(awk '$1=="-setcookie"{print $2}' "$VM_ARGS")
  COOKIE="${COOKIE:-$VM_ARGS_COOKIE}"
fi
COOKIE="${COOKIE:-monster}"

printHelpAndExit() {
  echo "Usage: ${PROGNAME} [OPTION]... [-- <additional Erlang cli options>]"
  echo "  -c cookie     specify shared Erlang cookie (default: monster)"
  echo "  -l HOST       specify remsh's host name (default: 127.0.0.1)"
  echo "  -m            use output of \`hostname -f\` as remsh's host name"
  echo "  -n NAME@HOST  specify couchdb's Erlang node name (-name in vm.args)"
  echo "  -v            verbose; print invocation line"
  echo "  -h            this help message"
  exit
}

while getopts ":hn:c:l:mv" optionName; do
  case "$optionName" in
    h)
      printHelpAndExit 0
      ;;
    n)
      NODE=$OPTARG
      ;;
    c)
      COOKIE=$OPTARG
      ;;
    l)
      LHOST=$OPTARG
      ;;
    m)
      LHOST=$(hostname -f)
      ;;
    v)
      VERBOSE=0
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      printHelpAndExit 0
      ;;
  esac
done

shift $((OPTIND - 1))

if [ ! -z "$VERBOSE" ]; then
  # cheap but it works
  set -x
fi

# If present, strip -name or -setcookie from ERL_FLAGS
# to avoid conflicts with the cli parameters
ERL_FLAGS_CLEAN=$(echo "$ERL_FLAGS" | sed 's/-setcookie \([^ ][^ ]*\)//g' | sed 's/-name \([^ ][^ ]*\)//g')

exec env ERL_FLAGS="$ERL_FLAGS_CLEAN" "$BINDIR/erl" -boot "$ROOTDIR/releases/$APP_VSN/start_clean" \
    -name remsh$$@$LHOST -remsh $NODE -hidden -setcookie $COOKIE \
    "$@"