#!/usr/bin/env python
# Copyright 2013-2014  Lars Wirzenius
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=


'''Create all filesystem object types.

This program creates a directory tree (the "farm") with all filesystem
object types that are interesting from the point of view of testing
backups. Use the --verbose option to see what is created.

'''


import cliapp
import os
import platform
import stat


class MakeFunnyFarm(cliapp.Application):

    def add_settings(self):
        self.settings.boolean(
            ['verbose'],
            'show what is created')

    def process_args(self, args):
        if len(args) != 1:
            raise cliapp.AppException(
                "Must have exactly one argument: the name of a directory "
                "that is to be created and populated")

        self.dirname = args[0]
        os.mkdir(self.dirname)
        
        # A bit of magic here: all the methods that create filesystem
        # objects have names starting with farm_ and here we find the
        # the names and call them. This avoids having to list all the
        # methods manually, or inlining all their code. A bit of magic
        # saves toil and boilerplate.

        method_names = [x for x in dir(self) if x.startswith('farm_')]
        for method_name in sorted(method_names):
            if self.settings['verbose']:
                print method_name[len('farm_'):]
            getattr(self, method_name)()

    def J(self, filename):
        '''Return filename within the farm directory.'''
        return os.path.join(self.dirname, filename)

    def farm_regular_file_empty(self):
        with open(self.J('file-empty'), 'w'):
            pass

    def farm_regular_file_1_byte(self):
        with open(self.J('file-one-byte'), 'wb') as f:
            f.write('x')

    def farm_regular_file_4096_byte(self):
        with open(self.J('file-four-kibibytes'), 'wb') as f:
            f.write('x' * 4096)

    def farm_hardlink_within_farm(self):
        with open(self.J('hardlink-1'), 'wb') as f:
            f.write('x' * 4096)
        os.link(self.J('hardlink-1'), self.J('hardlink-2'))

    def farm_directory_empty(self):
        os.mkdir(self.J('dir-empty'))

    def farm_symlink_within_farm_target_exists(self):
        with open(self.J('symlink-target'), 'w'):
            pass
        os.symlink('symlink-target', self.J('symlink-local-exists'))

    def farm_symlink_within_farm_target_doesnt_exist(self):
        os.symlink(
            self.J('does-not-exist'), 
            self.J('symlink-local-doesnt_exist'))

    def farm_symlink_outside_farm_target_exists(self):
        os.symlink('/', self.J('symlink-remote-exists'))

    def farm_symlink_outside_farm_target_doesnt_exist(self):
        os.symlink(
            self.J('/does-not-exist'), 
            self.J('symlink-remote-doesnt_exist'))

    def farm_symlink_to_containing_dir(self):
        os.symlink('.', self.J('symlink-to-dot'))

    def farm_symlink_to_subdir_of_containing_dir(self):
        os.mkdir(self.J('symlink-target-dir'))
        os.symlink('.', self.J('symlink-to-subdir'))

    def farm_socket(self):
        if platform.system() != "FreeBSD":
            os.mknod(self.J('socket'), stat.S_IFSOCK | 0700)

    def farm_fifo(self):
        os.mknod(self.J('fifo'), stat.S_IFIFO | 0700)

    def farm_regular_file_setuid(self):
        with open(self.J('file-setuid'), 'w'):
            pass
        os.chmod(self.J('file-setuid'), stat.S_ISUID | 0777)

    def farm_regular_file_setgid(self):
        with open(self.J('file-setgid'), 'w'):
            pass
        os.chmod(self.J('file-setgid'), stat.S_ISGID | 0777)

    def farm_regular_file_sticky_bit(self):
        with open(self.J('file-sticky-bit'), 'w'):
            pass
        os.chmod(self.J('file-sticky-bit'), stat.S_ISVTX | 0777)

    def farm_regular_file_xattr_user(self):
        with open(self.J('file-xattr-user'), 'w'):
            pass
        cliapp.runcmd(
            ['setfattr', '-n', 'user.foo', '-v', 'some value', 
             self.J('file-xattr-user')])

    def farm_regular_file_xattr_user_empty_value(self):
        # This is a special case: a key exists, but has an empty value.
        # Some tools treat such keys as non-existing, but others do not,
        # so Obnam needs to handle them.
        with open(self.J('file-xattr-user-empty-value'), 'w'):
            pass
        cliapp.runcmd(
            ['setfattr', '-n', 'user.foo', '-v', '""', 
             self.J('file-xattr-user')])


MakeFunnyFarm(description=__doc__).run()