Object
Environment variables that will be set for the subcommand. Refer to the documentation of new to understand how ShellOut interprets this.
ShellOut will push data from :input down the stdin of the subprocss. Normally set via options passed to new. Default: nil
When live_stream is set, stdout of the subprocess will be copied to it as the subprocess is running. For example, if live_stream is set to STDOUT, the command's output will be echoed to STDOUT.
An Array of acceptable exit codes. error! uses this list to determine if the command was successful. Normally set via options to new
Takes a single command, or a list of command fragments. These are used as arguments to Kernel.exec. See the Kernel.exec documentation for more explanation of how arguments are evaluated. The last argument can be an options Hash.
If the last argument is a Hash, it is removed from the list of args passed to exec and used as an options hash. The following options are available:
user: the user the commmand should run as. if an integer is given, it is used as a uid. A string is treated as a username and resolved to a uid with Etc.getpwnam
group: the group the command should run as. works similarly to user
cwd: the directory to chdir to before running the command
umask: a umask to set before running the command. If given as an Integer, be sure to use two leading zeros so it's parsed as Octal. A string will be treated as an octal integer
returns: one or more Integer values to use as valid exit codes for the subprocess. This only has an effect if you call error! after run_command.
environment: a Hash of environment variables to set before the command is run. By default, the environment will always be set to 'LC_ALL' => 'C' to prevent issues with multibyte characters in Ruby 1.8. To avoid this, use :environment => nil for no extra environment settings, or :environment => {'LC_ALL'=>nil, ...} to set other environment settings without changing the locale.
timeout: a Numeric value for the number of seconds to wait on the child process before raising an Exception. This is calculated as the total amount of time that ShellOut waited on the child process without receiving any output (i.e., IO.select returned nil). Default is 60 seconds. Note: the stdlib Timeout library is not used.
Invoke find(1) to search for .rb files:
find = Mixlib::ShellOut.new("find . -name '*.rb'") find.run_command # If all went well, the results are on +stdout+ puts find.stdout # find(1) prints diagnostic info to STDERR: puts "error messages" + find.stderr # Raise an exception if it didn't exit with 0 find.error!
Run a command as the www user with no extra ENV settings from /tmp
cmd = Mixlib::ShellOut.new("apachectl", "start", :user => 'www', :env => nil, :cwd => '/tmp') cmd.run_command # etc.
# File lib/mixlib/shellout.rb, line 148 def initialize(*command_args) @stdout, @stderr = '', '' @live_stream = nil @input = nil @log_level = :debug @log_tag = nil @environment = DEFAULT_ENVIRONMENT @cwd = nil @valid_exit_codes = [0] if command_args.last.is_a?(Hash) parse_options(command_args.pop) end @command = command_args.size == 1 ? command_args.first : command_args end
Checks the exitstatus against the set of valid_exit_codes. If exitstatus is not in the list of valid_exit_codes, calls invalid!, which raises an Exception.
nil: |
always returns nil when it does not raise |
::ShellCommandFailed: |
via invalid! |
# File lib/mixlib/shellout.rb, line 235 def error! unless Array(valid_exit_codes).include?(exitstatus) invalid!("Expected process to exit with #{valid_exit_codes.inspect}, but received '#{exitstatus}'") end end
The exit status of the subprocess. Will be nil if the command is still running or died without setting an exit status (e.g., terminated by `kill -9`).
# File lib/mixlib/shellout.rb, line 205 def exitstatus @status && @status.exitstatus end
Creates a String showing the output of the command, including a banner showing the exact command executed. Used by invalid! to show command results when the command exited with an unexpected status.
# File lib/mixlib/shellout.rb, line 192 def format_for_exception msg = "" msg << "---- Begin output of #{command} ----\n" msg << "STDOUT: #{stdout.strip}\n" msg << "STDERR: #{stderr.strip}\n" msg << "---- End output of #{command} ----\n" msg << "Ran #{command} returned #{status.exitstatus}" if status msg end
The gid that the subprocess will switch to. If the group attribute is given as a group name, it is converted to a gid by Etc.getgrnam
# File lib/mixlib/shellout.rb, line 180 def gid return nil unless group group.kind_of?(Integer) ? group : Etc.getgrnam(group.to_s).gid end
# File lib/mixlib/shellout.rb, line 254 def inspect "<#{self.class.name}##{object_id}: command: '#@command' process_status: #{@status.inspect} " + "stdout: '#{stdout.strip}' stderr: '#{stderr.strip}' child_pid: #{@child_pid.inspect} " + "environment: #{@environment.inspect} timeout: #{timeout} user: #@user group: #@group working_dir: #@cwd >" end
Raises a ShellCommandFailed exception, appending the command's stdout, stderr, and exitstatus to the exception message.
msg: A String to use as the basis of the exception message. The default explanation is very generic, providing a more informative message is highly encouraged.
ShellCommandFailed always
# File lib/mixlib/shellout.rb, line 249 def invalid!(msg=nil) msg ||= "Command produced unexpected results" raise ShellCommandFailed, msg + "\n" + format_for_exception end
Run the command, writing the command's standard out and standard error to stdout and stderr, and saving its exit status object to status
returns self; stdout, stderr, status, and exitstatus will be populated with results of the command
Errno::EACCES when you are not privileged to execute the command
Errno::ENOENT when the command is not available on the system (or not in the current $PATH)
CommandTimeout when the command does not complete within timeout seconds (default: 600s)
# File lib/mixlib/shellout.rb, line 220 def run_command if logger log_message = (log_tag.nil? ? "" : "#@log_tag ") << "sh(#@command)" logger.send(log_level, log_message) end super end
# File lib/mixlib/shellout.rb, line 185 def timeout @timeout || DEFAULT_READ_TIMEOUT end
The uid that the subprocess will switch to. If the user attribute was given as a username, it is converted to a uid by Etc.getpwnam
# File lib/mixlib/shellout.rb, line 173 def uid return nil unless user user.kind_of?(Integer) ? user : Etc.getpwnam(user.to_s).uid end
Set the umask that the subprocess will have. If given as a string, it will be converted to an integer by String#oct.
# File lib/mixlib/shellout.rb, line 167 def umask=(new_umask) @umask = (new_umask.respond_to?(:oct) ? new_umask.oct : new_umask.to_i) & 007777 end
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