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# (Be in -*- python -*- mode.)
#
# ====================================================================
# Copyright (c) 2000-2008 CollabNet. All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://subversion.tigris.org/license-1.html.
# If newer versions of this license are posted there, you may use a
# newer version instead, at your option.
#
# This software consists of voluntary contributions made by many
# individuals. For exact contribution history, see the revision
# history and logs, available at http://cvs2svn.tigris.org/.
# ====================================================================
"""This module contains generic utilities used by cvs2svn."""
import subprocess
from cvs2svn_lib.common import FatalError
from cvs2svn_lib.common import CommandError
from cvs2svn_lib.log import logger
def call_command(command, **kw):
"""Call the specified command, checking that it exits successfully.
Raise a FatalError if the command cannot be executed, or if it exits
with a non-zero exit code. Pass KW as keyword arguments to
subprocess.call()."""
logger.debug('Running command %r' % (command,))
try:
retcode = subprocess.call(command, **kw)
if retcode < 0:
raise FatalError(
'Command terminated by signal %d: "%s"'
% (-retcode, ' '.join(command),)
)
elif retcode > 0:
raise FatalError(
'Command failed with return code %d: "%s"'
% (retcode, ' '.join(command),)
)
except OSError, e:
raise FatalError(
'Command execution failed (%s): "%s"'
% (e, ' '.join(command),)
)
class CommandFailedException(Exception):
"""Exception raised if check_command_runs() fails."""
pass
def check_command_runs(command, commandname):
"""Check whether the command CMD can be executed without errors.
CMD is a list or string, as accepted by subprocess.Popen(). CMDNAME
is the name of the command as it should be included in exception
error messages.
This function checks three things: (1) the command can be run
without throwing an OSError; (2) it exits with status=0; (3) it
doesn't output anything to stderr. If any of these conditions is
not met, raise a CommandFailedException describing the problem."""
logger.debug('Running command %r' % (command,))
try:
pipe = subprocess.Popen(
command,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
except OSError, e:
raise CommandFailedException('error executing %s: %s' % (commandname, e,))
(stdout, stderr) = pipe.communicate()
if pipe.returncode or stderr:
msg = 'error executing %s; returncode=%s' % (commandname, pipe.returncode,)
if stderr:
msg += ', error output:\n%s' % (stderr,)
raise CommandFailedException(msg)
def get_command_output(command):
"""Run COMMAND and return its stdout.
COMMAND is a list of strings. Run the command and return its stdout
as a string. If the command exits with a nonzero return code or
writes something to stderr, raise a CommandError."""
"""A file-like object from which revision contents can be read."""
logger.debug('Running command %r' % (command,))
pipe = subprocess.Popen(
command,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
(stdout, stderr) = pipe.communicate()
if pipe.returncode or stderr:
raise CommandError(' '.join(command), pipe.returncode, stderr)
return stdout
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