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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
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()."""
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(cmd, cmdname):
"""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."""
try:
pipe = subprocess.Popen(
cmd,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
except OSError, e:
raise CommandFailedException('error executing %s: %s' % (cmdname, e,))
pipe.stdin.close()
pipe.stdout.read()
errmsg = pipe.stderr.read()
status = pipe.wait()
if status or errmsg:
msg = 'error executing %s: status %s' % (cmdname, status,)
if errmsg:
msg += ', error output:\n%s' % (errmsg,)
raise CommandFailedException(msg)
class PipeStream(object):
"""A file-like object from which revision contents can be read."""
def __init__(self, pipe_command):
self._pipe_command_str = ' '.join(pipe_command)
self.pipe = subprocess.Popen(
pipe_command,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
self.pipe.stdin.close()
def read(self, size=None):
if size is None:
return self.pipe.stdout.read()
else:
return self.pipe.stdout.read(size)
def close(self):
self.pipe.stdout.close()
error_output = self.pipe.stderr.read()
exit_status = self.pipe.wait()
if exit_status:
raise CommandError(self._pipe_command_str, exit_status, error_output)
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