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require "fcntl"
require "socket"
module Utils
def self.safe_fork(&block)
socket_path = "#{Dir.mktmpdir("homebrew", HOMEBREW_TEMP)}/socket"
server = UNIXServer.new(socket_path)
ENV["HOMEBREW_ERROR_PIPE"] = socket_path
read, write = IO.pipe
pid = fork do
begin
server.close
read.close
write.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
yield
rescue Exception => e
Marshal.dump(e, write)
write.close
exit! 1
end
end
ignore_interrupts(:quietly) do # the child will receive the interrupt and marshal it back
begin
socket = server.accept_nonblock
rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::ECONNABORTED, Errno::EPROTO, Errno::EINTR
retry unless Process.waitpid(pid, Process::WNOHANG)
else
socket.send_io(write)
end
write.close
data = read.read
read.close
Process.wait(pid) unless socket.nil?
raise Marshal.load(data) unless data.nil? or data.empty?
raise Interrupt if $?.exitstatus == 130
raise "Suspicious failure" unless $?.success?
end
ensure
server.close
FileUtils.rm_r File.dirname(socket_path)
end
end
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