Class: Yay::Installer

Inherits:
Object
  • Object
show all
Defined in:
lib/yay/installer.rb

Overview

installs .yay files from a remote url in to either ~/.yay or /etc/yay depending on the users permissions

Instance Method Summary collapse

Constructor Details

#initialize(file_name, url) ⇒ Installer

initialize an installer for the specified url. the .install method will attempt the actual installation process



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# File 'lib/yay/installer.rb', line 14

def initialize file_name, url
  # directories to iterate. begin with /etc/yay, which should only be
  # accessible to sudo. then try a local install.
  paths     = Yay::Paths.new
  validate_filename file_name
  @file_name = append_filetype file_name
  @dirs = [
    paths.global_yay_path,
    paths.local_yay_path
  ]
  @url = url
end

Instance Method Details

#append_filetype(string) ⇒ Object

add the .yay part to the filename if it’s missing



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# File 'lib/yay/installer.rb', line 33

def append_filetype string
  return "#{string}.yay" unless /\.yay$/.match(string)
  return string
end

#can_write_to_dir(dir, create) ⇒ Object

see if we can write to a directory. will try to create the folder (and its parents) unless asked otherwise



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# File 'lib/yay/installer.rb', line 40

def can_write_to_dir dir, create

    begin
      stat = File.stat(dir)
      return true if stat && stat.writable?
    rescue Errno::ENOENT
    end

    # create and try again if it doesn't exist
    if create
      begin
        FileUtils.mkdir_p dir
        #FileUtils.chmod 0644, dir 
        result = can_write_to_dir dir, false
        puts "Created #{dir}" if result
        return result
      rescue Errno::EACCES
      end
    end

    return false
end

#get_install_directory ⇒ Object

try to find the install directory



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# File 'lib/yay/installer.rb', line 64

def get_install_directory
  # search globally and then locally to see if we can write
  @dirs.each { |dir| 
    return dir if can_write_to_dir dir, true
  }
  return nil
end

#get_remote_string(url, limit = 5) ⇒ Object

make a curl-ish request and get the contents



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# File 'lib/yay/installer.rb', line 73

def get_remote_string url, limit=5
  raise  InstallFailedError.new url, 'HTTP redirect too deep' if limit == 0

  begin
    puts "Requesting #{url}"
    url = URI.parse(url)

    request = Net::HTTP::Get.new(url.path || '/')
    
    http    = Net::HTTP.new url.host, url.port
    #http.set_debug_output($stderr)
    http.use_ssl = url.scheme == 'https' 

    response     = http.start { |http2| 
      http2.request(request)
    }

  rescue StandardError => error
    raise InstallFailedError.new url, error.to_s
  end
  
  case response
    when Net::HTTPSuccess then 
      return response.body
    when Net::HTTPRedirection then
      puts "Redirecting to #{response['location']}"; 
      return get_remote_string(response['location'], limit - 1)
  end

  raise InstallFailedError.new url, "#{response.code} \"#{response.message}\"", response.body
end

#install ⇒ Object

attempt the installation process



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# File 'lib/yay/installer.rb', line 127

def install
  dest_folder = get_install_directory
  raise "Couldn't write to or create directories #{@dirs.join(' or ')} something is up with your system!" unless dest_folder
  string = get_remote_string @url
  verify_rules @url, string
  install_string string, dest_folder
end

#install_string(string, dest_folder) ⇒ Object

store a string



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# File 'lib/yay/installer.rb', line 118

def install_string string, dest_folder
  dest = "#{dest_folder}/#{@file_name}"
  File.open(dest, 'w') {|file|
    file.write(string)
  }
  puts "#{ColourWheel::success}Installed to #{dest}#{ColourWheel::end_colour}"
end

#validate_filename(string) ⇒ Object

some filenames just aren’t a good idea



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# File 'lib/yay/installer.rb', line 28

def validate_filename string
  raise BadFilenameError.new string if /[\?\*\\\/]/.match(string)
end

#verify_rules(url, string) ⇒ Object

ensure the rules we’ve downloaded parse correctly



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# File 'lib/yay/installer.rb', line 106

def verify_rules url, string
  begin
    parser = Yay::Parser.new
    parser.parse(string)
  rescue Yay::Error => error
    raise InstallFailedError.new url, error.printable_message, string
  end
  raise InstallFailedError.new url, "No rules in downloaded file", string if parser.get_rules == []
  return parser
end