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Class for dealing with all systemctl subp calls in a consistent manner.
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Make a subp call based on set args and handle errors by setting
failure code
:return: whether the subp call failed or not
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If subp call succeeded, return the timestamp from subp as a float.
:return: timestamp as a float
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Determine which init system a particular linux distro is using.
Each init system (systemd, upstart, etc) has a different way of
providing timestamps.
:return: timestamps of kernelboot, kernelendboot, and cloud-initstart
or TIMESTAMP_UNKNOWN if the timestamps cannot be retrieved.
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Gather timestamps that corresponds to kernel begin initialization,
kernel finish initialization using dmesg as opposed to systemctl
:return: the two timestamps plus a dummy timestamp to keep consistency
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Gather timestamps that corresponds to kernel begin initialization,
kernel finish initialization. and cloud-init systemd unit activation
:return: the three timestamps
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Take in raw events and create parent-child dependencies between events
in order to order events in chronological order.
:param events: JSONs from dump that represents events taken from logs
:param blame_sort: whether to sort by timestamp or by time taken.
:param print_format: formatting to represent event, time stamp,
and time taken by the event in one line
:param dump_files: whether to dump files into JSONs
:param log_datafiles: whether or not to log events generated
:return: boot records ordered chronologically
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A passthrough method that makes it easier to call generate_records()
:param events: JSONs from dump that represents events taken from logs
:param print_format: formatting to represent event, time stamp,
and time taken by the event in one line
:return: boot records ordered chronologically
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Takes in a log file, read it, and convert to json.
:param infile: The Log file to be read
:return: json version of logfile, raw file
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