features/step_definitions/time_syncing.rb

   1 # In some steps below we allow some slack when verifying that the date
   2 # was set appropriately because it may take time to send the `date`
   3 # command over the remote shell and get the answer back, parsing and
   4 # post-processing of the result, etc.
   5 def max_time_drift
   6   15
   7 end
   8
   9 When /^I set the system time to "([^"]+)"$/ do |time|
  10   $vm.execute_successfully("date -s '#{time}'")
  11   new_time = DateTime.parse($vm.execute_successfully("date").stdout).to_time
  12   expected_time_lower_bound = DateTime.parse(time).to_time
  13   expected_time_upper_bound = expected_time_lower_bound + max_time_drift
  14   assert(expected_time_lower_bound <= new_time &&
  15          new_time <= expected_time_upper_bound,
  16          "The guest's time was supposed to be set to " \
  17          "'#{expected_time_lower_bound}' but is '#{new_time}'")
  18 end
  19
  20 When /^I bump the (hardware clock's|system) time with "([^"]+)"$/ do |clock_type, timediff|
  21   case clock_type
  22   when "hardware clock's"
  23     old_time = DateTime.parse($vm.execute_successfully("hwclock -r").stdout).to_time
  24     $vm.execute_successfully("hwclock --set --date 'now #{timediff}'")
  25     new_time = DateTime.parse($vm.execute_successfully("hwclock -r").stdout).to_time
  26   when 'system'
  27     old_time = DateTime.parse($vm.execute_successfully("date").stdout).to_time
  28     $vm.execute_successfully("date -s 'now #{timediff}'")
  29     new_time = DateTime.parse($vm.execute_successfully("date").stdout).to_time
  30   end
  31   expected_time_lower_bound = DateTime.parse(
  32       cmd_helper(["date", "-d", "#{old_time} #{timediff}"])).to_time
  33   expected_time_upper_bound = expected_time_lower_bound + max_time_drift
  34   assert(expected_time_lower_bound <= new_time &&
  35          new_time <= expected_time_upper_bound,
  36          "The #{clock_type} time was supposed to be bumped to " \
  37          "'#{expected_time_lower_bound}' but is '#{new_time}'")
  38 end
  39
  40 Then /^Tails clock is less than (\d+) minutes incorrect$/ do |max_diff_mins|
  41   guest_time_str = $vm.execute("date --rfc-2822").stdout.chomp
  42   guest_time = Time.rfc2822(guest_time_str)
  43   host_time = Time.now
  44   diff = (host_time - guest_time).abs
  45   assert(diff < max_diff_mins.to_i*60,
  46          "The guest's clock is off by #{diff} seconds (#{guest_time})")
  47   puts "Time was #{diff} seconds off"
  48 end
  49
  50 Then /^the system clock is just past Tails' source date$/ do
  51   system_time_str = $vm.execute_successfully('date').to_s
  52   system_time = DateTime.parse(system_time_str).to_time
  53   source_time_cmd = 'sed -n -e "1s/^.* - \([0-9]\+\)$/\1/p;q" ' +
  54                     '/etc/amnesia/version'
  55   source_time_str = $vm.execute_successfully(source_time_cmd).to_s
  56   source_time = DateTime.parse(source_time_str).to_time
  57   diff = system_time - source_time  # => in seconds
  58   # Half an hour should be enough to boot Tails on any reasonable
  59   # hardware and VM setup.
  60   max_diff = 30*60
  61   assert(diff > 0,
  62          "The system time (#{system_time}) is before the Tails " +
  63          "source date (#{source_time})")
  64
  65   if diff <= max_diff
  66     # In this case the only acceptable explanation is that systemd
  67     # adjusted the time.
  68     systemd_has_adjusted_time = $vm.execute(
  69       "journalctl | grep 'System time before build time, advancing clock'"
  70     ).success?
  71     if ! systemd_has_adjusted_time
  72       raise(
  73         "The system time (#{system_time}) is more than #{max_diff} seconds " +
  74         "past the source date (#{source_time}) and systemd was not involved"
  75       )
  76     end
  77   end
  78 end
  79
  80 Then /^Tails' hardware clock is close to the host system's time$/ do
  81   host_time = Time.now
  82   hwclock_time_str = $vm.execute('hwclock -r').stdout.chomp
  83   hwclock_time = DateTime.parse(hwclock_time_str).to_time
  84   diff = (hwclock_time - host_time).abs
  85   assert(diff <= max_time_drift)
  86 end
  87
  88 Then /^the hardware clock is still off by "([^"]+)"$/ do |timediff|
  89   hwclock = DateTime.parse($vm.execute_successfully("hwclock -r").stdout.chomp).to_time
  90   expected_time_lower_bound = DateTime.parse(
  91       cmd_helper(["date", "-d", "now #{timediff}"])).to_time - max_time_drift
  92   expected_time_upper_bound = expected_time_lower_bound + max_time_drift
  93   assert(expected_time_lower_bound <= hwclock &&
  94          hwclock <= expected_time_upper_bound,
  95          "The host's hwclock should be approximately " \
  96          "'#{expected_time_lower_bound}' but is actually '#{hwclock}'")
  97 end