Class: Aspera::Environment

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/aspera/environment.rb

Overview

detect OS, architecture, and specific stuff

Constant Summary collapse

USER_INTERFACES = 
%i[text graphical].freeze
OS_WINDOWS = 
:windows
OS_MACOS = 
:osx
OS_LINUX = 
:linux
OS_AIX = 
:aix
OS_LIST = 
[OS_WINDOWS, OS_MACOS, OS_LINUX, OS_AIX].freeze
CPU_X86_64 = 
:x86_64
CPU_ARM64 = 
:arm64
CPU_PPC64 = 
:ppc64
CPU_PPC64LE = 
:ppc64le
CPU_S390 = 
:s390
CPU_LIST = 
[CPU_X86_64, CPU_ARM64, CPU_PPC64, CPU_PPC64LE, CPU_S390].freeze
BITS_PER_BYTE = 
8
MEBI = 
1024 * 1024
BYTES_PER_MEBIBIT = 
MEBI / BITS_PER_BYTE

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Environment

Returns a new instance of Environment.



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# File 'lib/aspera/environment.rb', line 250

def initialize
  @url_method = self.class.default_gui_mode
  @terminal_supports_unicode = nil
end

Instance Attribute Details

#url_method ⇒ Object

Returns the value of attribute url_method.



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# File 'lib/aspera/environment.rb', line 248

def url_method
  @url_method
end

Class Method Details

.architecture ⇒ Object

normalized architecture name see constants: OS_* and CPU_*



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# File 'lib/aspera/environment.rb', line 70

def architecture
  return "#{os}-#{cpu}"
end

.cpu ⇒ Object 



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# File 'lib/aspera/environment.rb', line 53

def cpu
  case RbConfig::CONFIG['host_cpu']
  when /x86_64/, /x64/
    return CPU_X86_64
  when /powerpc/, /ppc64/
    return CPU_PPC64LE if os.eql?(OS_LINUX)
    return CPU_PPC64
  when /s390/
    return CPU_S390
  when /arm/, /aarch64/
    return CPU_ARM64
  else Aspera.error_unexpected_value(RbConfig::CONFIG['host_cpu']){'host_cpu'}
  end
end

.default_gui_mode ⇒ Object

Returns :text or :graphical depending on the environment.

Returns:

  • :text or :graphical depending on the environment



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# File 'lib/aspera/environment.rb', line 217

def default_gui_mode
  # assume not remotely connected on macos and windows
  return :graphical if [Environment::OS_WINDOWS, Environment::OS_MACOS].include?(Environment.os)
  # unix family
  return :graphical if ENV.key?('DISPLAY') && !ENV['DISPLAY'].empty?
  return :text
end

.empty_binding ⇒ Object

empty variable binding for secure eval



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# File 'lib/aspera/environment.rb', line 89

def empty_binding
  return Kernel.binding
end

.exe_file(name = '') ⇒ Object

executable file extension for current OS



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# File 'lib/aspera/environment.rb', line 75

def exe_file(name='')
  return "#{name}.exe" if os.eql?(OS_WINDOWS)
  return name
end

.fix_home ⇒ Object

on Windows, the env var %USERPROFILE% provides the path to user’s home more reliably than %HOMEDRIVE%%HOMEPATH% so, tell Ruby the right way



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# File 'lib/aspera/environment.rb', line 82

def fix_home
  return unless os.eql?(OS_WINDOWS) && ENV.key?('USERPROFILE') && Dir.exist?(ENV.fetch('USERPROFILE', nil))
  ENV['HOME'] = ENV.fetch('USERPROFILE', nil)
  Log.log.debug{"Windows: set HOME to USERPROFILE: #{Dir.home}"}
end

.log_spawn(exec:, args: nil, env: nil) ⇒ String

Generate log line for external program with arguments

Parameters:

  • env (Hash, nil) (defaults to: nil) —

    environment variables

  • exec (String) —

    path to executable

  • args (Array, nil) (defaults to: nil) —

    arguments

Returns:

  • (String) —

    log line with environment, program and arguments



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# File 'lib/aspera/environment.rb', line 103

def log_spawn(exec:, args: nil, env: nil)
  [
    'execute:'.red,
    env&.map{|k, v| "#{k}=#{Shellwords.shellescape(v)}"},
    Shellwords.shellescape(exec),
    args&.map{|a|Shellwords.shellescape(a)}
  ].compact.flatten.join(' ')
end

.open_editor(file_path) ⇒ Object

open a file in an editor



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# File 'lib/aspera/environment.rb', line 238

def open_editor(file_path)
  if ENV.key?('EDITOR')
    system(ENV['EDITOR'], file_path.to_s)
  elsif Environment.os.eql?(Environment::OS_WINDOWS)
    system('notepad.exe', %Q{"#{file_path}"})
  else
    open_uri_graphical(file_path.to_s)
  end
end

.open_uri_graphical(uri) ⇒ Object

open a URI in a graphical browser command must be non blocking



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# File 'lib/aspera/environment.rb', line 227

def open_uri_graphical(uri)
  case Environment.os
  when Environment::OS_MACOS then return system('open', uri.to_s)
  when Environment::OS_WINDOWS then return system('start', 'explorer', %Q{"#{uri}"})
  when Environment::OS_LINUX   then return system('xdg-open', uri.to_s)
  else
    raise "no graphical open method for #{Environment.os}"
  end
end

.os ⇒ Object 



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# File 'lib/aspera/environment.rb', line 39

def os
  case RbConfig::CONFIG['host_os']
  when /mswin/, /msys/, /mingw/, /cygwin/, /bccwin/, /wince/, /emc/
    return OS_WINDOWS
  when /darwin/, /mac os/
    return OS_MACOS
  when /linux/
    return OS_LINUX
  when /aix/
    return OS_AIX
  else Aspera.error_unexpected_value(RbConfig::CONFIG['host_os']){'host_os'}
  end
end

.restrict_file_access(path, mode: nil) ⇒ Object

restrict access to a file or folder to user only



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# File 'lib/aspera/environment.rb', line 195

def restrict_file_access(path, mode: nil)
  if mode.nil?
    # or FileUtils ?
    if File.file?(path)
      mode = 0o600
    elsif File.directory?(path)
      mode = 0o700
    else
      Log.log.debug{"No restriction can be set for #{path}"}
    end
  end
  File.chmod(mode, path) unless mode.nil?
rescue => e
  Log.log.warn(e.message)
end

.ruby_version ⇒ Object 



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# File 'lib/aspera/environment.rb', line 35

def ruby_version
  return RbConfig::CONFIG['RUBY_PROGRAM_VERSION']
end

.secure_capture(exec:, args: [], **opts) ⇒ Object

Execute process and capture stdout

Parameters:

  • exec (String) —

    path to executable

  • args (Array) (defaults to: []) —

    arguments to executable

  • opts (Hash) —

    options to capture3

Returns:

  • stdout of executable or raise exception



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# File 'lib/aspera/environment.rb', line 165

def secure_capture(exec:, args: [], **opts)
  Aspera.assert_type(exec, String)
  Aspera.assert_type(args, Array)
  Aspera.assert_type(opts, Hash)
  Log.log.debug {log_spawn(exec: exec, args: args)}
  stdout, stderr, status = Open3.capture3(exec, *args, **opts)
  Log.log.debug{"status=#{status}, stderr=#{stderr}"}
  Log.log.trace1{"stdout=#{stdout}"}
  raise "process failed: #{status.exitstatus} : #{stderr}" unless status.success?
  return stdout
end

.secure_eval(code, file, line) ⇒ Object

secure execution of Ruby code



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# File 'lib/aspera/environment.rb', line 94

def secure_eval(code, file, line)
  Kernel.send('lave'.reverse, code, empty_binding, file, line)
end

.secure_execute(exec:, args: nil, env: nil, **system_args) ⇒ String

start process and wait for completion

Parameters:

  • env (Hash, nil) (defaults to: nil) —

    environment variables

  • exec (String) —

    path to executable

  • args (Array, nil) (defaults to: nil) —

    arguments

Returns:



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# File 'lib/aspera/environment.rb', line 143

def secure_execute(exec:, args: nil, env: nil, **system_args)
  Aspera.assert_type(exec, String)
  Aspera.assert_type(args, Array) unless args.nil?
  Aspera.assert_type(env, Hash) unless env.nil?
  Log.log.debug {log_spawn(exec: exec, args: args, env: env)}
  # start in separate process
  spawn_args = []
  spawn_args.push(env) unless env.nil?
  # ensure no shell expansion
  spawn_args.push([exec, exec])
  spawn_args.concat(args) unless args.nil?
  kwargs = {exception: true}
  kwargs.merge!(system_args)
  Kernel.system(*spawn_args, **kwargs)
  nil
end

.secure_spawn(exec:, args: nil, env: nil, **options) ⇒ String

Start process in background caller can call Process.wait on returned value

Parameters:

  • exec (String) —

    path to executable

  • args (Array, nil) (defaults to: nil) —

    arguments for executable

  • env (Hash, nil) (defaults to: nil) —

    environment variables

  • options (Hash, nil) —

    spawn options

Returns:

Raises:

  • (Exception) —

    if problem



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# File 'lib/aspera/environment.rb', line 120

def secure_spawn(exec:, args: nil, env: nil, **options)
  Aspera.assert_type(exec, String)
  Aspera.assert_type(args, Array) unless args.nil?
  Aspera.assert_type(env, Hash) unless env.nil?
  Aspera.assert_type(options, Hash) unless options.nil?
  Log.log.debug {log_spawn(exec: exec, args: args, env: env)}
  # start ascp in separate process
  spawn_args = []
  spawn_args.push(env) unless env.nil?
  spawn_args.push([exec, exec])
  spawn_args.concat(args) unless args.nil?
  opts = {close_others: true}
  opts.merge!(options) unless options.nil?
  ascp_pid = Process.spawn(*spawn_args, **opts)
  Log.log.debug{"pid: #{ascp_pid}"}
  return ascp_pid
end

.terminal? ⇒ Boolean

Returns true if we are in a terminal.

Returns:

  • (Boolean) —

    true if we are in a terminal



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# File 'lib/aspera/environment.rb', line 212

def terminal?
  $stdout.tty?
end

.write_file_restricted(path, force: false, mode: nil) ⇒ Object

Write content to a file, with restricted access

Parameters:

  • path (String) —

    the file path

  • force (Boolean) (defaults to: false) —

    if true, overwrite the file

  • mode (Integer) (defaults to: nil) —

    the file mode (permissions)



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# File 'lib/aspera/environment.rb', line 182

def write_file_restricted(path, force: false, mode: nil)
  Aspera.assert(block_given?, exception_class: Aspera::InternalError)
  if force || !File.exist?(path)
    # Windows may give error
    File.unlink(path) rescue nil
    # content provided by block
    File.write(path, yield)
    restrict_file_access(path, mode: mode)
  end
  return path
end

Instance Method Details

#open_uri(the_url) ⇒ Object

Allows a user to open a Url if method is “text”, then URL is displayed on terminal if method is “graphical”, then the URL will be opened with the default browser. this is non blocking



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# File 'lib/aspera/environment.rb', line 267

def open_uri(the_url)
  case @url_method
  when :graphical
    self.class.open_uri_graphical(the_url)
  when :text
    case the_url.to_s
    when /^http/
      puts "USER ACTION: please enter this url in a browser:\n#{the_url.to_s.red}\n"
    else
      puts "USER ACTION: open this:\n#{the_url.to_s.red}\n"
    end
  else
    raise StandardError, "unsupported url open method: #{@url_method}"
  end
end

#terminal_supports_unicode? ⇒ Boolean

www.gnu.org/software/libc/manual/html_node/Locale-Categories.html pubs.opengroup.org/onlinepubs/7908799/xbd/envvar.html

Returns:

  • (Boolean) —

    true if we can display Unicode characters



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# File 'lib/aspera/environment.rb', line 258

def terminal_supports_unicode?
  @terminal_supports_unicode = self.class.terminal? && %w(LC_ALL LC_CTYPE LANG).any?{|var|ENV[var]&.include?('UTF-8')} if @terminal_supports_unicode.nil?
  return @terminal_supports_unicode
end