64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
# © 2016 James R. Barlow: github.com/jbarlow83
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#
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# This file is part of OCRmyPDF.
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#
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# OCRmyPDF is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# OCRmyPDF is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with OCRmyPDF. If not, see <http://www.gnu.org/licenses/>.
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"""Wrappers to manage subprocess calls"""
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import os
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import re
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import sys
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from subprocess import run, STDOUT, PIPE, CalledProcessError
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from ..exceptions import MissingDependencyError
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def get_version(program, *, version_arg='--version', regex=r'(\d+(\.\d+)*)'):
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"Get the version of the specified program"
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args_prog = [program, version_arg]
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try:
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proc = run(
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args_prog,
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close_fds=True,
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universal_newlines=True,
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stdout=PIPE,
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stderr=STDOUT,
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check=True,
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)
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output = proc.stdout
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except FileNotFoundError as e:
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raise MissingDependencyError(
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"Could not find program '{}' on the PATH".format(program)
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) from e
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except CalledProcessError as e:
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if e.returncode < 0:
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raise MissingDependencyError(
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"Ran program '{}' but it exited with an error:\n{}".format(
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program, e.output
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)
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) from e
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raise MissingDependencyError(
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"Could not find program '{}' on the PATH".format(program)
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) from e
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try:
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version = re.match(regex, output.strip()).group(1)
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except AttributeError as e:
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raise MissingDependencyError(
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("The program '{}' did not report its version. " "Message was:\n{}").format(
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program, output
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)
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)
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return version
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