MCVE for CocoaPods/Xcodeproj issue #446

.gitignore

.DS_Store
/.build
/Packages
/*.xcodeproj

main.swift

print("Hello, world!")

Package.swift

import PackageDescription

let package = Package(
    name: "foo"
)

script.rb

require 'xcodeproj'
project_path = 'foo.xcodeproj'
project = Xcodeproj::Project.open(project_path)
project.save