~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2009 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Shell-like test scripts.

See developers/testing.html for more explanations.

"""

import doctest

import errno

import glob

import os

import shlex

from cStringIO import StringIO

from bzrlib import (

    osutils,

    tests,

    )

def split(s):

    """Split a command line respecting quotes."""

    scanner = shlex.shlex(s)

    scanner.quotes = '\'"`'

    scanner.whitespace_split = True

    for t in list(scanner):

        yield t

def _script_to_commands(text, file_name=None):

    """Turn a script into a list of commands with their associated IOs.

    Each command appears on a line by itself starting with '$ '. It can be

    associated with an input that will feed it and an expected output.

    Comments starts with '#' until the end of line.

    Empty lines are ignored.

    Input and output are full lines terminated by a '\n'.

    Input lines start with '<'.

    Output lines start with nothing.

    Error lines start with '2>'.

    """

    commands = []

    def add_command(cmd, input, output, error):

        if cmd is not None:

            if input is not None:

                input = ''.join(input)

            if output is not None:

                output = ''.join(output)

            if error is not None:

                error = ''.join(error)

            commands.append((cmd, input, output, error))

    cmd_cur = None

    cmd_line = 1

    lineno = 0

    input, output, error = None, None, None

    for line in text.split('\n'):

        lineno += 1

        # Keep a copy for error reporting

        orig = line

        comment =  line.find('#')

        if comment >= 0:

            # Delete comments

            line = line[0:comment]

            line = line.rstrip()

        if line == '':

            # Ignore empty lines

            continue

        if line.startswith('$'):

            # Time to output the current command

            add_command(cmd_cur, input, output, error)

            # And start a new one

            cmd_cur = list(split(line[1:]))

            cmd_line = lineno

            input, output, error = None, None, None

        elif line.startswith('<'):

            if input is None:

                if cmd_cur is None:

                    raise SyntaxError('No command for that input',

                                      (file_name, lineno, 1, orig))

                input = []

            input.append(line[1:] + '\n')

        elif line.startswith('2>'):

            if error is None:

                if cmd_cur is None:

                    raise SyntaxError('No command for that error',

                                      (file_name, lineno, 1, orig))

                error = []

            error.append(line[2:] + '\n')

        else:

            # can happen if the first line is not recognized as a command, eg

            # if the prompt has leading whitespace

            if output is None:

                if cmd_cur is None:

                    raise SyntaxError('No command for line %r' % (line,),

                                      (file_name, lineno, 1, orig))

                output = []

            output.append(line + '\n')

    # Add the last seen command

    add_command(cmd_cur, input, output, error)

    return commands

def _scan_redirection_options(args):

    """Recognize and process input and output redirections.

    :param args: The command line arguments

    :return: A tuple containing: 

        - The file name redirected from or None

        - The file name redirected to or None

        - The mode to open the output file or None

        - The reamining arguments

    """

    def redirected_file_name(direction, name, args):

        if name == '':

            try:

                name = args.pop(0)

            except IndexError:

                # We leave the error handling to higher levels, an empty name

                # can't be legal.

                name = ''

        return name

    remaining = []

    in_name = None

    out_name, out_mode = None, None

    while args:

        arg = args.pop(0)

        if arg.startswith('<'):

            in_name = redirected_file_name('<', arg[1:], args)

        elif arg.startswith('>>'):

            out_name = redirected_file_name('>>', arg[2:], args)

            out_mode = 'ab+'

        elif arg.startswith('>',):

            out_name = redirected_file_name('>', arg[1:], args)

            out_mode = 'wb+'

        else:

            remaining.append(arg)

    return in_name, out_name, out_mode, remaining

class ScriptRunner(object):

    """Run a shell-like script from a test.

    Can be used as:

    from bzrlib.tests import script

    ...

        def test_bug_nnnnn(self):

            sr = script.ScriptRunner()

            sr.run_script(self, '''

            $ bzr init

            $ bzr do-this

            # Boom, error

            ''')

    """

    def __init__(self):

        self.output_checker = doctest.OutputChecker()

        self.check_options = doctest.ELLIPSIS

    def run_script(self, test_case, text):

        """Run a shell-like script as a test.

        :param test_case: A TestCase instance that should provide the fail(),

            assertEqualDiff and _run_bzr_core() methods as well as a 'test_dir'

            attribute used as a jail root.

        :param text: A shell-like script (see _script_to_commands for syntax).

        """

        for cmd, input, output, error in _script_to_commands(text):

            self.run_command(test_case, cmd, input, output, error)

    def run_command(self, test_case, cmd, input, output, error):

        mname = 'do_' + cmd[0]

        method = getattr(self, mname, None)

        if method is None:

            raise SyntaxError('Command not found "%s"' % (cmd[0],),

                              None, 1, ' '.join(cmd))

        if input is None:

            str_input = ''

        else:

            str_input = ''.join(input)

        args = list(self._pre_process_args(cmd[1:]))

        retcode, actual_output, actual_error = method(test_case,

                                                      str_input, args)

        self._check_output(output, actual_output, test_case)

        self._check_output(error, actual_error, test_case)

        if retcode and not error and actual_error:

            test_case.fail('In \n\t%s\nUnexpected error: %s'

                           % (' '.join(cmd), actual_error))

        return retcode, actual_output, actual_error

    def _check_output(self, expected, actual, test_case):

        if expected is None:

            # Specifying None means: any output is accepted

            return

        if actual is None:

            test_case.fail('We expected output: %r, but found None'

                           % (expected,))

        matching = self.output_checker.check_output(

            expected, actual, self.check_options)

        if not matching:

            # Note that we can't use output_checker.output_difference() here

            # because... the API is broken ('expected' must be a doctest

            # specific object of which a 'want' attribute will be our

            # 'expected' parameter. So we just fallback to our good old

            # assertEqualDiff since we know there *are* differences and the

            # output should be decently readable.

            test_case.assertEqualDiff(expected, actual)

    def _pre_process_args(self, args):

        new_args = []

        for arg in args:

            # Strip the simple and double quotes since we don't care about

            # them.  We leave the backquotes in place though since they have a

            # different semantic.

            if arg[0] in  ('"', "'") and arg[0] == arg[-1]:

                yield arg[1:-1]

            else:

                if glob.has_magic(arg):

                    matches = glob.glob(arg)

                    if matches:

                        # We care more about order stability than performance

                        # here

                        matches.sort()

                        for m in matches:

                            yield m

                else:

                    yield arg

    def _read_input(self, input, in_name):

        if in_name is not None:

            infile = open(in_name, 'rb')

            try:

                # Command redirection takes precedence over provided input

                input = infile.read()

            finally:

                infile.close()

        return input

    def _write_output(self, output, out_name, out_mode):

        if out_name is not None:

            outfile = open(out_name, out_mode)

            try:

                outfile.write(output)

            finally:

                outfile.close()

            output = None

        return output

    def do_bzr(self, test_case, input, args):

        retcode, out, err = test_case._run_bzr_core(

            args, retcode=None, encoding=None, stdin=input, working_dir=None)

        return retcode, out, err

    def do_cat(self, test_case, input, args):

        (in_name, out_name, out_mode, args) = _scan_redirection_options(args)

        if args and in_name is not None:

            raise SyntaxError('Specify a file OR use redirection')

        inputs = []

        if input:

            inputs.append(input)

        input_names = args

        if in_name:

            args.append(in_name)

        for in_name in input_names:

            try:

                inputs.append(self._read_input(None, in_name))

            except IOError, e:

                # Some filenames are illegal on Windows and generate EINVAL

                # rather than just saying the filename doesn't exist

                if e.errno in (errno.ENOENT, errno.EINVAL):

                    return (1, None,

                            '%s: No such file or directory\n' % (in_name,))

                raise

        # Basically cat copy input to output

        output = ''.join(inputs)

        # Handle output redirections

        try:

            output = self._write_output(output, out_name, out_mode)

        except IOError, e:

            # If out_name cannot be created, we may get 'ENOENT', however if

            # out_name is something like '', we can get EINVAL

            if e.errno in (errno.ENOENT, errno.EINVAL):

                return 1, None, '%s: No such file or directory\n' % (out_name,)

            raise

        return 0, output, None

    def do_echo(self, test_case, input, args):

        (in_name, out_name, out_mode, args) = _scan_redirection_options(args)

        if input or in_name:

            raise SyntaxError('echo doesn\'t read from stdin')

        if args:

            input = ' '.join(args)

        # Always append a \n'

        input += '\n'

        # Process output

        output = input

        # Handle output redirections

        try:

            output = self._write_output(output, out_name, out_mode)

        except IOError, e:

            if e.errno in (errno.ENOENT, errno.EINVAL):

                return 1, None, '%s: No such file or directory\n' % (out_name,)

            raise

        return 0, output, None

    def _get_jail_root(self, test_case):

        return test_case.test_dir

    def _ensure_in_jail(self, test_case, path):

        jail_root = self._get_jail_root(test_case)

        if not osutils.is_inside(jail_root, osutils.normalizepath(path)):

            raise ValueError('%s is not inside %s' % (path, jail_root))

    def do_cd(self, test_case, input, args):

        if len(args) > 1:

            raise SyntaxError('Usage: cd [dir]')

        if len(args) == 1:

            d = args[0]

            self._ensure_in_jail(test_case, d)

        else:

            # The test "home" directory is the root of its jail

            d = self._get_jail_root(test_case)

        os.chdir(d)

        return 0, None, None

    def do_mkdir(self, test_case, input, args):

        if not args or len(args) != 1:

            raise SyntaxError('Usage: mkdir dir')

        d = args[0]

        self._ensure_in_jail(test_case, d)

        os.mkdir(d)

        return 0, None, None

    def do_rm(self, test_case, input, args):

        err = None

        def error(msg, path):

            return  "rm: cannot remove '%s': %s\n" % (path, msg)

        force, recursive = False, False

        opts = None

        if args and args[0][0] == '-':

            opts = args.pop(0)[1:]

            if 'f' in opts:

                force = True

                opts = opts.replace('f', '', 1)

            if 'r' in opts:

                recursive = True

                opts = opts.replace('r', '', 1)

        if not args or opts:

            raise SyntaxError('Usage: rm [-fr] path+')

        for p in args:

            self._ensure_in_jail(test_case, p)

            # FIXME: Should we put that in osutils ?

            try:

                os.remove(p)

            except OSError, e:

                # Various OSes raises different exceptions (linux: EISDIR,

                #   win32: EACCES, OSX: EPERM) when invoked on a directory

                if e.errno in (errno.EISDIR, errno.EPERM, errno.EACCES):

                    if recursive:

                        osutils.rmtree(p)

                    else:

                        err = error('Is a directory', p)

                        break

                elif e.errno == errno.ENOENT:

                    if not force:

                        err =  error('No such file or directory', p)

                        break

                else:

                    raise

        if err:

            retcode = 1

        else:

            retcode = 0

        return retcode, None, err

class TestCaseWithMemoryTransportAndScript(tests.TestCaseWithMemoryTransport):

    """Helper class to experiment shell-like test and memory fs.

    This not intended to be used outside of experiments in implementing memoy

    based file systems and evolving bzr so that test can use only memory based

    resources.

    """

    def setUp(self):

        super(TestCaseWithMemoryTransportAndScript, self).setUp()

        self.script_runner = ScriptRunner()

    def run_script(self, script):

        return self.script_runner.run_script(self, script)

    def run_command(self, cmd, input, output, error):

        return self.script_runner.run_command(self, cmd, input, output, error)

class TestCaseWithTransportAndScript(tests.TestCaseWithTransport):

    """Helper class to quickly define shell-like tests.

    Can be used as:

    from bzrlib.tests import script

    class TestBug(script.TestCaseWithTransportAndScript):

        def test_bug_nnnnn(self):

            self.run_script('''

            $ bzr init

            $ bzr do-this

            # Boom, error

            ''')

    """

    def setUp(self):

        super(TestCaseWithTransportAndScript, self).setUp()

        self.script_runner = ScriptRunner()

    def run_script(self, script):

        return self.script_runner.run_script(self, script)

    def run_command(self, cmd, input, output, error):

        return self.script_runner.run_command(self, cmd, input, output, error)