image.py

# -*- python -*-
# -*- coding: utf-8 -*-

# This file is part of Installsystems.
#
# Installsystems is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Installsystems 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Installsystems.  If not, see <http://www.gnu.org/licenses/>.


'''
Image stuff
'''

import codecs
import ConfigParser
import cStringIO
import difflib
import json
import locale
import math
import os
import re
import shutil
import stat
import subprocess
import sys
import tarfile
import time
import installsystems
import installsystems.template as istemplate
import installsystems.tools as istools
from installsystems.exception import *
from installsystems.printer import *
from installsystems.tools import PipeFile
from installsystems.tarball import Tarball


class Image(object):
    '''
    Abstract class of images
    '''

    # format should be a float  X.Y but for compatibility reason it's a string
    # before version 6, it's strict string comparaison
    format = "1"
    extension = ".isimage"

    @staticmethod
    def check_image_name(buf):
        '''
        Check if @buf is a valid image name
        '''
        if re.match("^[-_\w]+$", buf) is None:
            raise ISError(u"Invalid image name %s" % buf)

    @staticmethod
    def check_image_version(buf):
        '''
        Check if @buf is a valid image version
        '''
        if re.match("^\d+$", buf) is None:
            raise ISError(u"Invalid image version %s" % buf)

    @staticmethod
    def compare_versions(v1, v2):
        '''
        For backward compatibility, image class offer a method to compare image versions
        But code is now inside tools
        '''
        return istools.compare_versions(v1, v2)

    def _load_modules(self, lib_list, get_str):
        '''
        Load python module embedded in image

        Return a dict of {module_name: module object}
        '''
        if not lib_list:
            return {}
        arrow(u"Load libs")
        old_level = arrowlevel(1)
        gl ={}
        # order matter!
        lib_list.sort()
        for filename in lib_list:
            arrow(os.path.basename(filename))
            name = os.path.basename(filename).split('-', 1)[1][:-3]
            if name in gl:
                error('Module %s already loaded' % name)
            # extract source code
            try:
                code = get_str(filename)
            except Exception as e:
                raise ISError(u"Extracting lib %s fail: %s" %
                                (filename, e))
            gl[name] = istools.string2module(name, code, filename)
            # avoid ImportError when exec 'import name'
            sys.modules[name] = gl[name]
        arrowlevel(level=old_level)
        return gl

class SourceImage(Image):
    '''
    Image source manipulation class
    '''

    @classmethod
    def create(cls, path, force=False):
        '''
        Create an empty source image
        '''
        # check local repository
        if not istools.isfile(path):
            raise NotImplementedError("SourceImage must be local")
        # main path
        build_path = os.path.join(path, "build")
        parser_path = os.path.join(path, "parser")
        setup_path = os.path.join(path, "setup")
        payload_path = os.path.join(path, "payload")
        lib_path = os.path.join(path, "lib")
        # create base directories
        arrow("Creating base directories")
        try:
            for d in (path, build_path, parser_path, setup_path, payload_path,
                      lib_path):
                if not os.path.exists(d) or not os.path.isdir(d):
                    os.mkdir(d)
        except Exception as e:
            raise ISError(u"Unable to create directory: %s" % d, e)
        # create example files
        arrow("Creating examples")
        arrowlevel(1)
        # create dict of file to create
        examples = {}
        # create description example from template
        examples["description"] = {"path": "description",
                                   "content": istemplate.description % {
                "name": "",
                "version": "1",
                "description": "",
                "author": "",
                "is_min_version": installsystems.version}}
        # create changelog example from template
        examples["changelog"] = {"path": "changelog", "content": istemplate.changelog}
        # create build example from template
        examples["build"] = {"path": "build/01-build.py", "content": istemplate.build}
        # create parser example from template
        examples["parser"] = {"path": "parser/01-parser.py", "content": istemplate.parser}
        # create setup example from template
        examples["setup"] = {"path": "setup/01-setup.py", "content": istemplate.setup}
        for name in examples:
            try:
                arrow(u"Creating %s example" % name)
                expath = os.path.join(path, examples[name]["path"])
                if not force and os.path.exists(expath):
                    warn(u"%s already exists. Skipping!" % expath)
                    continue
                open(expath, "w").write(examples[name]["content"])
            except Exception as e:
                raise ISError(u"Unable to create example file", e)
        try:
            # setting executable rights on files in setup and parser
            arrow("Setting executable rights on scripts")
            umask = os.umask(0)
            os.umask(umask)
            for dpath in (build_path, parser_path, setup_path):
                for f in os.listdir(dpath):
                    istools.chrights(os.path.join(dpath, f), mode=0777 & ~umask)
        except Exception as e:
            raise ISError(u"Unable to set rights on %s" % pf, e)
        arrowlevel(-1)

    def __init__(self, path):
        # check local repository
        if not istools.isfile(path):
            raise NotImplementedError("SourceImage must be local")
        Image.__init__(self)
        self.base_path = os.path.abspath(path)
        for pathtype in ("build", "parser", "setup", "payload", "lib"):
            setattr(self, u"%s_path" % pathtype, os.path.join(self.base_path, pathtype))
        self.check_source_image()
        self.description = self.parse_description()
        self.changelog = self.parse_changelog()
        # script tarball path
        self.image_name = u"%s-%s%s" % (self.description["name"],
                                        self.description["version"],
                                        self.extension)

    def check_source_image(self):
        '''