This module provies a `safe_exec` method which is a drop-in replacement for `Kernel.exec` which addresses a specific issue which manifests on OS X 10.5 (GH-51) and perhaps other operating systems. This issue causes `exec` to fail if there is more than one system thread. In that case, `safe_exec` automatically falls back to forking.
# File lib/vagrant/util/safe_exec.rb, line 10 def self.exec(command, *args) # Create a list of things to rescue from. Since this is OS # specific, we need to do some defined? checks here to make # sure they exist. rescue_from = [] rescue_from << Errno::EOPNOTSUPP if defined?(Errno::EOPNOTSUPP) rescue_from << Errno::E045 if defined?(Errno::E045) rescue_from << SystemCallError fork_instead = false begin pid = nil pid = fork if fork_instead Kernel.exec(command, *args) if pid.nil? Process.wait(pid) if pid rescue *rescue_from # We retried already, raise the issue and be done raise if fork_instead # The error manifested itself, retry with a fork. fork_instead = true retry end end