98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
 
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#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# -----------------------------------------------------------------------
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# This file is part of TISBackup
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#
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# TISBackup 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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# TISBackup 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 TISBackup. If not, see <http://www.gnu.org/licenses/>.
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#
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# -----------------------------------------------------------------------
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"""Process execution and monitoring utilities."""
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import errno
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import os
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import select
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import subprocess
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def call_external_process(shell_string):
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"""Execute a shell command and raise exception on non-zero exit code."""
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p = subprocess.call(shell_string, shell=True)
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if p != 0:
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raise Exception("shell program exited with error code " + str(p), shell_string)
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def monitor_stdout(aprocess, onoutputdata, context):
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"""Reads data from stdout and stderr from aprocess and return as a string
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on each chunk, call a call back onoutputdata(dataread)
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"""
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assert isinstance(aprocess, subprocess.Popen)
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read_set = []
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stdout = []
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line = ""
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if aprocess.stdout:
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read_set.append(aprocess.stdout)
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if aprocess.stderr:
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read_set.append(aprocess.stderr)
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while read_set:
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try:
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rlist, wlist, xlist = select.select(read_set, [], [])
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except select.error as e:
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if e.args[0] == errno.EINTR:
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continue
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raise
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# Reads one line from stdout
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if aprocess.stdout in rlist:
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data = os.read(aprocess.stdout.fileno(), 1)
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data = data.decode(errors="ignore")
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if data == "":
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aprocess.stdout.close()
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read_set.remove(aprocess.stdout)
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while data and data not in ("\n", "\r"):
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line += data
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data = os.read(aprocess.stdout.fileno(), 1)
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data = data.decode(errors="ignore")
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if line or data in ("\n", "\r"):
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stdout.append(line)
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if onoutputdata:
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onoutputdata(line, context)
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line = ""
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# Reads one line from stderr
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if aprocess.stderr in rlist:
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data = os.read(aprocess.stderr.fileno(), 1)
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data = data.decode(errors="ignore")
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if data == "":
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aprocess.stderr.close()
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read_set.remove(aprocess.stderr)
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while data and data not in ("\n", "\r"):
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line += data
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data = os.read(aprocess.stderr.fileno(), 1)
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data = data.decode(errors="ignore")
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if line or data in ("\n", "\r"):
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stdout.append(line)
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if onoutputdata:
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onoutputdata(line, context)
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line = ""
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aprocess.wait()
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if line:
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stdout.append(line)
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if onoutputdata:
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onoutputdata(line, context)
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return "\n".join(stdout)
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