datalayer-s3-sync

#!/bin/bash
# (c) Wolfgang Ziegler // fago
# Modified by Zachary Brown, Chia Networks Inc
#
# Original Script: https://gist.github.com/fago/9608238
#
# Inotify script to trigger a command on file changes.
#
# The script triggers the command as soon as a file event occurs. Events
# occurring during command execution are aggregated and trigger a single command
# execution only.
#
# Paths are hard-coded in the "Configuration" section.  Edit the "COMMAND" with 
# the local path and the S3 bucket name you wish to use.  Also update the 
# "WATCHDIR" to be the directory to watch to trigger the syncing action.  
#
# Copy this file to /usr/local/bin/datalayer-s3-sync for best results with the
# systemd init file provided.  
#
# Usage example: Trigger rsync for synchronizing file changes.
# /usr/local/bin/datalayer-s3-sync


######### Configuration #########

EVENTS="CREATE,CLOSE_WRITE,DELETE,MODIFY,MOVED_FROM,MOVED_TO"
COMMAND="/usr/local/bin/aws s3 sync --delete /home/zachary/.chia/mainnet/data_layer/db/server_files_location_testnet10 s3://mydatalayer1"
WATCHDIR="/home/zachary/.chia/mainnet/data_layer/db/server_files_location_testnet10"

## Exclude Git and temporary files from watching.
EXCLUDE='(\.git|\.swp|\.swx)'

## Whether to enable verbosity. If enabled, change events are output.
VERBOSE=1

##################################

#if [ -z "$1" ]; then
# echo "Usage: $0 Command"
# exit 1;
#fi

##
## Setup pipes. For usage with read we need to assign them to file descriptors.
##
RUN=$(mktemp -u)
mkfifo "$RUN"
exec 3<>$RUN

RESULT=$(mktemp -u)
mkfifo "$RESULT"
exec 4<>$RESULT

clean_up () {
  ## Cleanup pipes.
  rm $RUN
  rm $RESULT
}

## Execute "clean_up" on exit.
trap "clean_up" EXIT

##
## Run inotifywait in a loop that is not blocked on command execution and ignore
## irrelevant events.
##
inotifywait -m -q -r -e $EVENTS --exclude $EXCLUDE --format '%w%f' $WATCHDIR | \
  while read FILE
  do
    if [ $VERBOSE -ne 0 ]; then
      echo [CHANGE] $FILE
    fi

    ## Clear $PID if the last command has finished.
    if [ ! -z "$PID" ] && ( ! ps -p $PID > /dev/null ); then
      PID=""
    fi

    ## If no command is being executed, execute one.
    ## Else, wait for the command to finish and then execute again.
    if [ -z "$PID" ]; then
      ## Execute the following as background process.
      ## It runs the command once and repeats if we tell him so.
          ($COMMAND; while read -t0.001 -u3 LINE; do
            echo running >&4
            $COMMAND
          done)&

      PID=$!
      WAITING=0
    else
      ## If a previous waiting command has been executed, reset the variable.
      if [ $WAITING -eq 1 ] && read -t0.001 -u4; then
        WAITING=0
      fi

      ## Tell the subprocess to execute the command again if it is not waiting
      ## for repeated execution already.
      if [ $WAITING -eq 0 ]; then
        echo "run" >&3
        WAITING=1
      fi

      ## If we are already waiting, there is nothing todo.
    fi
done