#!/usr/bin/ruby

require 'optparse'
require 'yaml'
require 'fileutils'
require 'pathname'

@options = {}

def system!(cmd)
  system(cmd) or raise "failed to run #{cmd}"
end

def sanitize(str, where)
  raise "unsanitary string in #{where}" if (str =~ /[^\w.-]/)
  str
end

def sanitize_path(str, where)
  raise "unsanitary string in #{where}" if (str =~ /[^@\w\/.:+-]/)
  str
end

def info(str)
  puts str unless @options[:quiet]
end

################################

OptionParser.new do |opts|
  opts.banner = "Usage: build [options] <build-description>.yml"

  opts.on("-q", "--quiet", "be quiet") do |v|
    @options[:quiet] = v
  end

  opts.on("-s SIGNER", "--signer SIGNER", "identity to sign as") do |v|
    @options[:signer] = v
  end

  opts.on("-r REL", "--release REL", "release name") do |v|
    @options[:release] = v
  end

  opts.on("-d DEST", "--destination DEST", "directory to place signature in") do |v|
    @options[:destination] = v
  end
end.parse!

base_dir = Pathname.new(__FILE__).expand_path.dirname.parent

build_desc_file = ARGV.shift or raise "must supply YAML build description file"

build_desc = YAML.load_file(build_desc_file)

in_sums = []

result_dir = 'result'

package_name = build_desc["name"] or raise "must supply name"
optionals = build_desc["optionals"] or []
package_name = sanitize(package_name, "package name")

result_file = "#{package_name}-res.yml"
result_path = File.join(result_dir, result_file)
File.exists?(result_path) or raise "#{result_path} does not exist"
result = YAML.load_file(result_path)

destination = @options[:destination] || File.join(base_dir, "sigs", package_name)
release = @options[:release] || "test"
release = sanitize(release, "release")

result['release'] = release
result['name'] = package_name
result['type'] = 'build'
result['optionals'] = optionals

signer = @options[:signer] or raise "must supply signer with --signer"

FileUtils.mkdir_p(destination)

release_path = File.join(destination, release, signer)
FileUtils.mkdir_p(release_path)
assert_path = File.join(release_path, "#{package_name}-build.assert")
File.open(assert_path, "w") do |io|
  io.write result.to_yaml
end
system!("gpg --detach-sign -u \"#{signer}\" \"#{assert_path}\"")