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require "open3"
require "vendor/plist/plist"
require "shellwords"
require "extend/io"
require "hbc/utils/hash_validator"
module Hbc
class SystemCommand
extend Predicable
def self.run(executable, **options)
new(executable, **options).run!
end
def self.run!(command, **options)
run(command, **options, must_succeed: true)
end
def run!
@processed_output = { stdout: "", stderr: "" }
odebug "Executing: #{expanded_command}"
each_output_line do |type, line|
case type
when :stdout
processed_output[:stdout] << line
ohai line.chomp if print_stdout?
when :stderr
processed_output[:stderr] << line
ohai line.chomp if print_stderr?
end
end
assert_success if must_succeed?
result
end
def initialize(executable, args: [], sudo: false, input: [], print_stdout: false, print_stderr: true, must_succeed: false, **options)
@executable = executable
@args = args
@sudo = sudo
@input = input
@print_stdout = print_stdout
@print_stderr = print_stderr
@must_succeed = must_succeed
options.extend(HashValidator).assert_valid_keys(:chdir)
@options = options
end
def command
[*sudo_prefix, executable, *args]
end
private
attr_reader :executable, :args, :input, :options, :processed_output, :processed_status
attr_predicate :sudo?, :print_stdout?, :print_stderr?, :must_succeed?
def sudo_prefix
return [] unless sudo?
askpass_flags = ENV.key?("SUDO_ASKPASS") ? ["-A"] : []
["/usr/bin/sudo", *askpass_flags, "-E", "--"]
end
def assert_success
return if processed_status&.success?
raise CaskCommandFailedError.new(command, processed_output[:stdout], processed_output[:stderr], processed_status)
end
def expanded_command
@expanded_command ||= command.map do |arg|
if arg.respond_to?(:to_path)
File.absolute_path(arg)
else
String(arg)
end
end
end
def each_output_line(&b)
executable, *args = expanded_command
unless File.exist?(executable)
executable = which(executable, PATH.new(ENV["PATH"], HOMEBREW_PREFIX/"bin"))
end
raw_stdin, raw_stdout, raw_stderr, raw_wait_thr =
Open3.popen3([executable, executable], *args, **options)
write_input_to(raw_stdin)
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)
[*input].each(&raw_stdin.method(:print))
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
Result.new(command,
processed_output[:stdout],
processed_output[:stderr],
processed_status.exitstatus)
end
class 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.zero?
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 =~ /\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 CaskError, "Empty plist input" unless output =~ /\S/
output.sub!(/\A(.*?)(<\?\s*xml)/m, '\2')
_warn_plist_garbage(command, Regexp.last_match[1]) if ARGV.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 CaskError, <<~EOS
Empty result parsing plist output from command.
command was:
#{command}
output we attempted to parse:
#{output}
EOS
end
xml
end
end
end
end
|
