Make empty month folders for testing snapshot cleanup.

empty-snapshots.sh

#!/bin/bash
#
# Make empty month folders for testing backup cleanup


# --- Variables --- #

OS=$(uname -s)
HOST=$(hostname)
DESTINATION="./Backup/$HOST"
YEAR="$1"
TIME="$2"



# --- Main Program --- #

# Use current year if none was provided
if [[ $YEAR == '' ]]; then
    YEAR=$(date +%Y)
fi

# Set a default timestamp if none was provided
if [[ $TIME == '' ]]; then
    TIME=$(date +%H%M%S)
fi

# BSD date in OS X has a different syntax than GNU date in Linux
if [[ $OS == "Darwin" ]]; then

    # Julian date used to ensure a folder for each day of that particular year is created
    DAYS_IN_YEAR=$(date -j -f "%Y-%m-%d" "$YEAR-12-31" "+%j") 

    for (( d = 0 ; d < $DAYS_IN_YEAR ; d += 1)); do
      mkdir -p $DESTINATION/$(date -v +${d}d -j -f "%Y-%m-%d" "$YEAR-1-1" "+%Y-%m-%d-$TIME")
    done

elif [[ $OS == "Linux" ]]; then

    DAYS_IN_YEAR=$(date -d "$YEAR-12-31" "+%j")

    for (( d = 0 ; d < $DAYS_IN_YEAR ; d += 1)); do
      mkdir -p $DESTINATION/$(date -d "$YEAR-1-1 + $d day" "+%Y-%m-%d-$TIME")
    done
    
fi