| Tan Gao | a83a256 | 2013-03-20 13:30:42 -0700 | [diff] [blame] | 1 | # Copyright (c) 2013 The Chromium OS Authors. All rights reserved. |
| 2 | # Use of this source code is governed by a BSD-style license that can be |
| 3 | # found in the LICENSE file. |
| 4 | |
| 5 | from autotest_lib.client.common_lib import error |
| 6 | |
| 7 | |
| 8 | def get_datetime_float(host): |
| 9 | """ |
| 10 | Returns host's system time in seconds since epoch. |
| 11 | |
| 12 | @param host: an Autotest host object. |
| 13 | @returns a float, timestamp since epoch in <seconds>.<nanoseconds>. |
| 14 | |
| 15 | @raises TestError: if error reading datetime or converting its value |
| 16 | from string to float. |
| 17 | """ |
| 18 | r = host.run('date +%s.%N') |
| 19 | if r.exit_status > 0: |
| 20 | err = ('Error reading datetime from capturer (%r): %r' % |
| 21 | (r.exit_status, r.stderr)) |
| 22 | raise error.TestError(err) |
| 23 | try: |
| 24 | return float(r.stdout) |
| 25 | except ValueError as e: |
| 26 | raise error.TestError('Error converting datetime string: %r', e) |