42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
# Copyright 2016 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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"""Utilities used with Brillo hosts."""
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_RUN_BACKGROUND_TEMPLATE = '( %(cmd)s ) </dev/null >/dev/null 2>&1 & echo -n $!'
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_WAIT_CMD_TEMPLATE = """\
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to=%(timeout)d; \
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while test ${to} -ne 0; do \
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test $(ps %(pid)d | wc -l) -gt 1 || break; \
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sleep 1; \
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to=$((to - 1)); \
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done; \
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test ${to} -ne 0 -o $(ps %(pid)d | wc -l) -eq 1 \
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"""
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def run_in_background(host, cmd):
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"""Runs a command in the background on the DUT.
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@param host: A host object representing the DUT.
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@param cmd: The command to run.
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@return The background process ID (integer).
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"""
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background_cmd = _RUN_BACKGROUND_TEMPLATE % {'cmd': cmd}
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return int(host.run_output(background_cmd).strip())
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def wait_for_process(host, pid, timeout=-1):
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"""Waits for a process on the DUT to terminate.
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@param host: A host object representing the DUT.
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@param pid: The process ID (integer).
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@param timeout: Number of seconds to wait; default is wait forever.
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@return True if process terminated within the alotted time, False otherwise.
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"""
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wait_cmd = _WAIT_CMD_TEMPLATE % {'pid': pid, 'timeout': timeout}
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return host.run(wait_cmd, ignore_status=True).exit_status == 0
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