spigot-patcher.sh

#!/bin/bash

## Validate arguments
if [ "$#" -ne 2 ]; then
        echo "Fetches latest Spigot patch and applies it."
        echo
        echo "Usage: <spigot-1649-jar-path> <output-file>"
        exit 1
fi

## Vars
SOURCE=$1
OUTPUT=$2

PATCHER="./SpigotPatcher-1.0.jar"
BASEURL="http://www.spigotmc.org/spigot-updates"

TIME=$(TZ="Australia/Sydney" date +%s)

DAYS=30 # How far back to look
END_TIME=$((TIME - (60 * 60 * 24 * DAYS)))

## Spigot patch function
function patch_spigot () {
        PATCHFILE=$1

        echo "Patching Spigot with $PATCHFILE..."
        echo

        java -jar $PATCHER $SOURCE $PATCHFILE $OUTPUT

        echo
        echo "Patching complete!"
}

## Iterate through possible filenames
echo -n "Locating latest Spigot patch... "

while [ $TIME -gt $END_TIME ]; do
        DATE=$(TZ="Australia/Sydney" date -d @$TIME -I | sed 's,-,,g')

        for i in {z..a}; do
                ID="spigot-$DATE$i"
                URL="$BASEURL/$ID.bps"

                ## Fetch HTTP status code
                STATUS=$(curl -s -I $URL | grep HTTP | cut -d ' ' -f 2)

                ## Check if file exists via HTTP 200
                if [ $STATUS -eq 200 ]; then
                        echo "Found: $ID"

                        TIMESTAMP=$(date +%s)
                        FILENAME="$ID-$TIMESTAMP.bps"

                        echo -n "Downloading patch file... "
                        curl -s -o ./$FILENAME $URL
                        echo "Done!"

                        patch_spigot $FILENAME

                        rm -f ./$FILENAME

                        echo "All done! Patched and updated file here: $OUTPUT"
                        exit
                fi
        done

        TIME=$((TIME-86400))
done

echo "Failed to locate patch. That's probably not a good sign."
exit 2