replicate

replicate.sh

#!/bin/bash

set -e

LOGFILE="$HOME/replicate.log"
exec >> "$LOGFILE"
exec 2>&1

echo "Replicate script started at $(date) for $1 -> $2"

# Take a pair of args for $1 = location to backup and $2 = destination

# TODO Do a check via ssh call if it is a remote path.
# # Check if the destination exists
# if [ ! -d "$2" ]; then
#   echo "Destination does not exist"
#   exit 1
# fi
#
# # Check if the destination is writable
# if [ ! -w "$2" ]; then
#   echo "Destination is not writable"
#   exit 1
# fi

# Check if the source exists
if [ ! -d "$1" ]; then
  echo "Source does not exist"
  exit 1
fi

# Path to the lockfile. Name it after the source and dest for disambiguation (hey maybe you have two of these running
# to the same destination)
TMPDIR="/var/lock"
[ -d "$TMPDIR" ] || TMPDIR="/tmp"
LOCKFILE="$TMPDIR/replicate-${1//[\/:@]/-}__${2//[\/:@]/-}.lock"

# Use -n to quit if unable to acquire lock. Don't need to use the fancy fd method since the critical command is
# singular.
FLOCK=/usr/bin/flock

[ -x $FLOCK ] || FLOCK='/opt/homebrew/bin/flock'

$FLOCK -n "$LOCKFILE" rsync -avi --stats "$1" "$2"
echo "Replicate script finished at $(date) for $1 -> $2"