P.S. gunfighterj - I stole your sums list ;)

identifySpigot.sh

#!/bin/bash
SUMS_URL="http://s3.amazonaws.com/cubedhost-prisma/spigot/sums"
JENKINS_URL="http://ci.md-5.net/job/Spigot"

if [ -z $1 ]; then
        echo "A tool which tries to identify hash, build #, and full version for an arbitrary Spigot jar file."
        echo
        echo "Usage: ./identifySpigot <spigot.jar>"
        echo
        exit 1
fi

spigotFile=$1

if [ ! -e $spigotFile ]; then
	echo "File does not exist."
	exit 1
fi

## load checksums
echo -n "Loading checsksums... "

SUMS=$(curl -s $SUMS_URL)

if [ $? -ne 0 ]; then
	echo "Failed."
	exit 1	
else
	echo "Done!"
fi

echo

## md5 the spigot file
echo -n "Checksum: "

hash=$(md5sum $spigotFile | awk '{ print $1 }')

echo $hash

## look up the hash in the list
echo -n "Build: "

buildNumber="unknown"

if [[ ! -z "$SUMS" ]]; then
	buildNumber="#"$(echo "$SUMS" | grep $hash | awk '{ print $1 }')
fi

if [[ $buildNumber != "#" ]]; then
    	echo "$buildNumber"
else
        echo "Not found. Is it newer than MC 1.7.10?"
fi

## try to find the full Spigot jar filename
pomProps=$(unzip -p $spigotFile META-INF/maven/org.spigotmc/spigot-api/pom.properties)
[ $? -ne 0 ] && echo "Failed to load version info." && exit 1

echo -n "Version: "

version=$(echo "$pomProps" | grep version | cut -d '=' -f 2)

if [[ -z "$version" ]]; then
	echo "Failed to detect."
else
	echo "$version"
fi

## find Spigot/CB git commit hashes
manifest=$(unzip -p $spigotFile META-INF/MANIFEST.MF)
[ $? -ne 0 ] && echo "Failed to load extra version info." && exit 1

implVersion=$(echo "$manifest" | grep 'Implementation-Version' | awk '{ print $2 }' | grep git)

if [[ $(echo "$implVersion" | wc -l) -ne 1 ]]; then
	echo "Doesn't contain specific version info."
else
	spigotCommit=$(echo "$implVersion" | cut -d '-' -f 3)
	cbCommit=$(echo "$implVersion"| cut -d '-' -f 4)
	
	if [[ ! -z $spigotCommit ]] && [[ -z $cbCommit ]]; then
		echo
		echo "This jar does not contain git commit info for Spigot/CraftBukkit."
	else
		echo "Spigot: $spigotCommit"
		echo "CraftBukkit: $cbCommit"
	fi
fi