Published 2017-06-03
In the *nix ecosystem, there are a lot of tools that are great to chain together. I'd encourage everyone to learn their tools, but sometimes the tools are complex, and you only want to do something simple.
I keep forgetting how to crypto. What I generally want to do is encrypt and sign a directory, then pull that same directory later.
Here's the script I threw together today. It takes one argument, either a directory to encrypt, or a gnupg encrypted tar gzipped directory and extracts it.
#!/usr/bin/env ruby # gpg_folder - Script to quickly tar, compress and encrypt directories # GpgFolder service drives the OS to perform encrypt/decrypt methods GpgFolder = Struct.new(:opts) do def call return false if opts.errors.any? if opts.encrypt? do_encrypt elsif opts.decrypt? do_decrypt else raise ";_; --not sure what I should do now" end true end def print_errors puts "Computer says no" errors.each do |error| puts "* #{error}" end end private def do_encrypt run("tar -cz #{opts.dir_name} | gpg --sign -o #{opts.archive_name}") end def do_decrypt run("gpg -d #{opts.archive_name} | tar xz") end def run(cmd) puts cmd system(cmd) end end # Interprets how the application was called, used to direct GpgFolder service Options = Struct.new(:dir_or_file) do CRYPT_EXTENSION = /\.tgz.gpg\z/ def errors @errors ||= [].tap do unless encrypt? ^ decrypt? errors << "Please specify a directory to encrypt, or a file ending in .tgz.gpg" end end end def encrypt? !dir_or_file.nil? && !decrypt? && File.directory?(dir_or_file) end def decrypt? !dir_or_file.nil? && dir_or_file.match(CRYPT_EXTENSION) end def dir_name if encrypt? dir_or_file else dir_or_file.sub(CRYPT_EXTENSION, '') end end def archive_name if encrypt? "#{dir_or_file}.tgz.gpg" else dir_or_file end end end opts = Options.new(ARGV.first) service = GpgFolder.new(opts) service.call or service.print_errors