splitting mpgw

parent-filter.rb

#!/usr/bin/env ruby

def execute(cmd)
  stdout = `#{cmd}`
  if $?.success?
    return stdout
  end
  raise "execution of command \"#{cmd}\" failed. Status: #{$?}"
end
args = readline.split

revisions = args.values_at(* args.each_index.select(&:odd?)).uniq

if revisions.length == 2
  # fast-forward-able
  if execute("git merge-base #{revisions[0]} #{revisions[1]}").include? revisions[0]
    revisions.shift
  elsif execute("git merge-base #{revisions[1]} #{revisions[0]}").include? revisions[1]
    revisions.pop
  end
end

puts ['-p'].product(revisions).join(' ')

split.sh

#!/bin/bash

set -u -x -e

if [ $# -ne 1 ]; then
	echo "expected two arguments given $#"
	exit 1
fi

CLONE_PATH=$1

if [[ ! -d $CLONE_PATH ]]; then
  git clone "$(dirname $CLONE_PATH)/vcap-services" $CLONE_PATH
fi
SCRIPT_DIR=$(cd $(dirname $0) && pwd)

cd $CLONE_PATH

# package_cache and friends
git checkout origin/master -B filtered
INDEX_FILTER="git rm -r -f --cached --quiet --ignore-unmatch \$( git ls-tree --name-only \$GIT_COMMIT | egrep -v '^marketplace' )"
git filter-branch -f --prune-empty \
	--index-filter "$INDEX_FILTER" \
	--parent-filter $SCRIPT_DIR/parent-filter.rb

git branch -v