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require "open3"
require "shellwords"
class Hbc::SystemCommand
attr_reader :command
def self.run(executable, options = {})
new(executable, options).run!
end
def self.run!(command, options = {})
run(command, options.merge(must_succeed: true))
end
def run!
@processed_output = { stdout: "", stderr: "" }
odebug "Executing: #{expanded_command.utf8_inspect}"
each_output_line do |type, line|
case type
when :stdout
processed_output[:stdout] << line
ohai line.chomp if options[:print_stdout]
when :stderr
processed_output[:stderr] << line
ohai line.chomp if options[:print_stderr]
end
end
assert_success if options[:must_succeed]
result
end
def initialize(executable, options)
@executable = executable
@options = options
process_options!
end
private
attr_reader :executable, :options, :processed_output, :processed_status
def process_options!
options.assert_valid_keys :input, :print_stdout, :print_stderr, :args, :must_succeed, :sudo, :bsexec
sudo_prefix = %w[/usr/bin/sudo -E --]
bsexec_prefix = ["/bin/launchctl", "bsexec", options[:bsexec] == :startup ? "/" : options[:bsexec]]
@command = [executable]
options[:print_stderr] = true unless options.key?(:print_stderr)
@command.unshift(*bsexec_prefix) if options[:bsexec]
@command.unshift(*sudo_prefix) if options[:sudo]
@command.concat(options[:args]) if options.key?(:args) && !options[:args].empty?
@command[0] = Shellwords.shellescape(@command[0]) if @command.size == 1
nil
end
def assert_success
return if processed_status && processed_status.success?
raise Hbc::CaskCommandFailedError.new(command.utf8_inspect, processed_output[:stdout], processed_output[:stderr], processed_status)
end
def expanded_command
@expanded_command ||= command.map { |arg|
if arg.respond_to?(:to_path)
File.absolute_path(arg)
else
String(arg)
end
}
end
def each_output_line(&b)
raw_stdin, raw_stdout, raw_stderr, raw_wait_thr =
Open3.popen3(*expanded_command)
write_input_to(raw_stdin) if options[:input]
raw_stdin.close_write
each_line_from [raw_stdout, raw_stderr], &b
@processed_status = raw_wait_thr.value
end
def write_input_to(raw_stdin)
Array(options[:input]).each { |line| raw_stdin.puts line }
end
def each_line_from(sources)
loop do
readable_sources = IO.select(sources)[0]
readable_sources.delete_if(&:eof?).first(1).each do |source|
type = (source == sources[0] ? :stdout : :stderr)
begin
yield(type, source.readline_nonblock || "")
rescue IO::WaitReadable, EOFError
next
end
end
break if readable_sources.empty?
end
sources.each(&:close_read)
end
def result
Hbc::SystemCommand::Result.new(command,
processed_output[:stdout],
processed_output[:stderr],
processed_status.exitstatus)
end
end
class Hbc::SystemCommand::Result
attr_accessor :command, :stdout, :stderr, :exit_status
def initialize(command, stdout, stderr, exit_status)
@command = command
@stdout = stdout
@stderr = stderr
@exit_status = exit_status
end
def plist
@plist ||= self.class._parse_plist(@command, @stdout.dup)
end
def success?
@exit_status == 0
end
def merged_output
@merged_output ||= @stdout + @stderr
end
def to_s
@stdout
end
def self._warn_plist_garbage(command, garbage)
return true unless garbage =~ %r{\S}
external = File.basename(command.first)
lines = garbage.strip.split("\n")
opoo "Non-XML stdout from #{external}:"
$stderr.puts lines.map { |l| " #{l}" }
end
def self._parse_plist(command, output)
raise Hbc::CaskError, "Empty plist input" unless output =~ %r{\S}
output.sub!(%r{\A(.*?)(<\?\s*xml)}m, '\2')
_warn_plist_garbage(command, Regexp.last_match[1]) if Hbc.debug
output.sub!(%r{(<\s*/\s*plist\s*>)(.*?)\Z}m, '\1')
_warn_plist_garbage(command, Regexp.last_match[2])
xml = Plist.parse_xml(output)
unless xml.respond_to?(:keys) && !xml.keys.empty?
raise Hbc::CaskError, <<-EOS
Empty result parsing plist output from command.
command was:
#{command.utf8_inspect}
output we attempted to parse:
#{output}
EOS
end
xml
rescue Plist::ParseError => e
raise Hbc::CaskError, <<-EOS
Error parsing plist output from command.
command was:
#{command.utf8_inspect}
error was:
#{e}
output we attempted to parse:
#{output}
EOS
end
end
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