# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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from autotest_lib.client.common_lib import error
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def get_datetime_float(host):
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"""
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Returns host's system time in seconds since epoch.
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@param host: an Autotest host object.
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@returns a float, timestamp since epoch in <seconds>.<nanoseconds>.
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@raises TestError: if error reading datetime or converting its value
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from string to float.
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"""
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r = host.run('date +%s.%N')
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if r.exit_status > 0:
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err = ('Error reading datetime from capturer (%r): %r' %
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(r.exit_status, r.stderr))
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raise error.TestError(err)
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try:
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return float(r.stdout)
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except ValueError as e:
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raise error.TestError('Error converting datetime string: %r', e)
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