sxc-rrb

#!/bin/sh

# Backups using sxc and rrb.

HELP="Usage: $0 config"

# Exit codes
EX_USAGE=64

fail()
{
  echo -e "$1" >&2
  exit $2
}

[ "$#" -eq 1 ] || fail "Invalid usage.\n$HELP" $EX_USAGE
[ "$1" ]       || fail "Config file missing.\n$HELP" $EX_USAGE
source $1

main()
{
  PID=$1

  while [ ! -p $JID/in ]; do
    echo "Waiting for $JID/in"
    sleep 0.5
  done

  echo -e "\0:pwd $PASSWORD\0" > $JID/in
  echo -e "\0:pri $PRIORITY\0" > $JID/in
  echo -e "\0:set available\0" > $JID/in

  while [ "`cat $JID/nfo/presence`" = "offline" ]; do
    sleep 1
  done

  LAST_USER=
  LAST_CONFIGS=()
  for ENTRY in ${USERS[@]}; do
    if echo "$ENTRY" | grep -qs "@"; then
      if [ "$LAST_USER" ]; then
        echo -e "\0:add $LAST_USER\0" > $JID/in
        handle_contact $PID "$LAST_USER" "${LAST_CONFIGS[@]}" &
      fi
      LAST_USER="$ENTRY"
      LAST_CONFIGS=()
    else
      if [ "${LAST_CONFIGS}" ]; then
        LAST_CONFIGS=("${LAST_CONFIGS[@]}" "$ENTRY")
      else
        LAST_CONFIGS=("$ENTRY")
      fi
    fi
  done

  echo -e "\0:add $LAST_USER\0" > $JID/in
  handle_contact $PID "$LAST_USER" "${LAST_CONFIGS[@]}" &

  tail --lines=0 --follow --pid $PID $JID/out 2> /dev/null |
  while read -r line; do
    OUT=`echo $line | cut -d" " -f 2-` # Remove date
    if echo $OUT | grep -qs "^Disconnected"; then
      ( sleep 5; echo -e "\0:set available\0" > $JID/in) &
    fi
  done
}

handle_contact()
{
  PID=$1
  CONTACT=$2
  CONFIGS=${*:3}
  FILE_OUT=$JID/$CONTACT/out
  FILE_IN=$JID/$CONTACT/in

  while [ ! -p $FILE_IN -a -f $FILE_OUT ]; do
    echo "Waiting for $CONTACT/{in,out}"
    sleep 0.5
  done

  tail --lines=0 --follow --pid $PID $FILE_OUT 2> /dev/null |
  while read -r line; do
    OUT=`echo $line | cut -d" " -f 2-` # Remove date

    # We are only interested in messages from the other contact.
    if ! echo $OUT | grep -qs "^<$CONTACT> "; then
      continue
    fi

    MSG=`echo $OUT | cut -d" " -f 2-`

    CMD=`echo $MSG | cut -d" " -f 1`
    if [ ":help" = "$CMD" ]; then
      echo "\
Commands:
  :backup name
  :list" > $FILE_IN
    elif [ ":list" = "$CMD" ]; then
      echo "Valid hosts: ${CONFIGS[@]}" > $FILE_IN
    elif [ ":backup" = "$CMD" ]; then
      NAME=`echo $MSG | cut -d" " -f 2-`

      for CONFIG in ${CONFIGS[@]}; do
        if [ "$CONFIG" = "$NAME" ]; then
          VALID=true
        fi
      done
      if [ "$VALID" = "true" ]; then
        echo "Running: rrb \"$CONFIG_PREFIX$NAME$CONFIG_SUFFIX\"" > $FILE_IN
        sleep 0.1
        rrb "$CONFIG_PREFIX$NAME$CONFIG_SUFFIX" &> $FILE_IN
        echo "rrb \"$CONFIG_PREFIX$NAME$CONFIG_SUFFIX\" finished with exit code: $?" \
        > $FILE_IN
      else
        echo "Invalid hostname $NAME" > $FILE_IN
      fi
    else
      echo "Invalid usage, see :help" > $FILE_IN
    fi
  done
}

sxc $JID --port $PORT &
PID=$!
main $PID &
wait $PID