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require 'open3'
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require 'shellwords'
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module Proxy::Util
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class CommandTask
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include Proxy::Log
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# track all threads in the class variable
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@@tasks = []
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# create new task and spawn new thread logging all the cmd
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# output to the proxy log. only the process' output is connected
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# stderr is redirected to proxy error log, stdout to proxy debug log
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def initialize(cmd)
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# clean finished tasks from the array
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@@tasks = @@tasks.collect { |t| nil unless t.is_a? String }.compact
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# run the task in its own thread
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logger.debug "Starting task (total: #{@@tasks.size}): #{cmd}"
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@task = Thread.new(cmd) do |cmd|
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Open3::popen3(cmd) do |stdin,stdout,stderr,thr|
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# PIDs are not available under Ruby 1.8
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pid = thr.nil? ? rand(9999) : thr.pid
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stdout.each do |line|
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logger.debug "[#{pid}] #{line}"
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end
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stderr.each do |line|
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logger.error "[#{pid}] #{line}"
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end
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end
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$?
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end
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@@tasks << @task
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end
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# wait for the task to finish and get the subprocess return code
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def join
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@task.value
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end
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# wait for all tasks to finish
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def self.join_all
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@@tasks.each { |aThread| aThread.join }
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end
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end
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# searches for binaries in predefined directories and user PATH
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# accepts a binary name and an array of paths to search first
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# if path is omitted will search only in user PATH
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def which(bin, *path)
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path = path + ['/usr/bin', '/usr/sbin', '/usr/local/bin', '/usr/local/sbin']
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path += ENV['PATH'].split(File::PATH_SEPARATOR)
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path.flatten.uniq.each do |dir|
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dest = File.join(dir, bin)
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return dest if FileTest.file? dest and FileTest.executable? dest
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end
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return false
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rescue StandardError => e
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logger.warn e
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return false
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end
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def escape_for_shell(command)
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# This is a backport for using the core Shellwords#escape that's in 1.9.2
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# when using 1.8.7.
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if RUBY_VERSION < '1.9.2'
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return command.shellescape if command.respond_to? :shellescape
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# An empty argument will be skipped, so return empty quotes.
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return "''" if command.empty?
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command = command.dup
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# Process as a single byte sequence because not all shell
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# implementations are multibyte aware.
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command.gsub!(/([^A-Za-z0-9_\-.,:\/@\n])/n, "\\\\\\1")
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command.gsub!(/\n/, "'\n'")
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return command
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else
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Shellwords.escape(command)
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end
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end
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end
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