63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
import logging
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import subprocess
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logger = logging.getLogger(__name__)
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ERROR_OUTPUT_MAX_LINE_COUNT = 25
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BORG_ERROR_EXIT_CODE = 2
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def execute_and_log_output(full_command, output_log_level, shell):
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last_lines = []
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process = subprocess.Popen(
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full_command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=shell
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)
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while process.poll() is None:
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line = process.stdout.readline().rstrip().decode()
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if not line:
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continue
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# Keep the last few lines of output in case the command errors, and we need the output for
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# the exception below.
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last_lines.append(line)
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if len(last_lines) > ERROR_OUTPUT_MAX_LINE_COUNT:
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last_lines.pop(0)
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logger.log(output_log_level, line)
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remaining_output = process.stdout.read().rstrip().decode()
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if remaining_output: # pragma: no cover
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logger.log(output_log_level, remaining_output)
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exit_code = process.poll()
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# If shell is True, assume we're running something other than Borg and should treat all non-zero
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# exit codes as errors.
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error = bool(exit_code != 0) if shell else bool(exit_code >= BORG_ERROR_EXIT_CODE)
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if error:
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# If an error occurs, include its output in the raised exception so that we don't
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# inadvertently hide error output.
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if len(last_lines) == ERROR_OUTPUT_MAX_LINE_COUNT:
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last_lines.insert(0, '...')
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raise subprocess.CalledProcessError(
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exit_code, ' '.join(full_command), '\n'.join(last_lines)
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)
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def execute_command(full_command, output_log_level=logging.INFO, shell=False):
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'''
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Execute the given command (a sequence of command/argument strings) and log its output at the
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given log level. If output log level is None, instead capture and return the output. If
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shell is True, execute the command within a shell.
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'''
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logger.debug(' '.join(full_command))
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if output_log_level is None:
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output = subprocess.check_output(full_command, shell=shell)
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return output.decode() if output is not None else None
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else:
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execute_and_log_output(full_command, output_log_level, shell=shell)
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