~azzar1/unity/add-show-desktop-key

# IVLE - Informatics Virtual Learning Environment

# Copyright (C) 2007-2008 The University of Melbourne

#

# 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 St, Fifth Floor, Boston, MA  02110-1301  USA

# Module: setup/setuputil

# Author: Matt Giuca, Refactored by David Coles

# Date:   02/07/2008

# setup/setuputil.py

# Contains a set of functions useful for the setup program.

import os

import shutil

import errno

import sys

import pysvn

import string

import stat

# Import modules from the website is tricky since they're in the www

# directory.

sys.path.append('lib')

import common.makeuser

# Determine which Python version (2.4 or 2.5, for example) we are running,

# and use that as the filename to the Python directory.

# Just get the first 3 characters of sys.version.

PYTHON_VERSION = sys.version[0:3]

# Location of standard programs

RSYNC = '/usr/bin/rsync'

# UID of the Webserver

wwwuid = 33

def copy_file_to_jail(src, dry):

    """Copies a single file from an absolute location into the same location

    within the jail. src must begin with a '/'. The jail will be located

    in a 'jail' subdirectory of the current path."""

    action_copyfile(src, 'jail' + src, dry)

# The actions call Python os functions but print actions and handle dryness.

# May still throw os exceptions if errors occur.

class RunError:

    """Represents an error when running a program (nonzero return)."""

    def __init__(self, prog, retcode):

        self.prog = prog

        self.retcode = retcode

    def __str__(self):

        return str(self.prog) + " returned " + repr(self.retcode)

def action_runprog(prog, args, dry):

    """Runs a unix program. Searches in $PATH. Synchronous (waits for the

    program to return). Runs in the current environment. First prints the

    action as a "bash" line.

    Throws a RunError with a retcode of the return value of the program,

    if the program did not return 0.

    prog: String. Name of the program. (No path required, if in $PATH).

    args: [String]. Arguments to the program. (Note, this does not allow you to

        set argv[0]; it will always be prog.)

    dry: Bool. If True, prints but does not execute.

    """

    print prog, string.join(args, ' ')

    if dry: return

    ret = os.spawnvp(os.P_WAIT, prog, [prog] + args)

    if ret != 0:

        raise RunError(prog, ret)

def action_remove(path, dry):

    """Calls rmtree, deleting the target file if it exists."""

    try:

        print "rm -r", path

        if not dry:

            shutil.rmtree(path, True)

    except OSError, (err, msg):

        if err != errno.EEXIST:

            raise

        # Otherwise, didn't exist, so we don't care

def action_rename(src, dst, dry):

    """Calls rename. Deletes the target if it already exists."""

    action_remove(dst, dry)

    print "mv ", src, dst

    if dry: return

    try:

        os.rename(src, dst)

    except OSError, (err, msg):

        if err != errno.EEXIST:

            raise

def action_mkdir(path, dry):

    """Calls mkdir. Silently ignored if the directory already exists.

    Creates all parent directories as necessary."""

    print "mkdir -p", path

    if dry: return

    try:

        os.makedirs(path)

    except OSError, (err, msg):

        if err != errno.EEXIST:

            raise

def action_copytree(src, dst, dry):

    """Copies an entire directory tree. Symlinks are seen as normal files and

    copies of the entire file (not the link) are made. Creates all parent

    directories as necessary.

    See shutil.copytree."""

    # Allow copying over itself

    if (os.path.normpath(os.path.join(os.getcwd(),src)) ==

        os.path.normpath(os.path.join(os.getcwd(),dst))):

        return

    # Try to do the copy with rsync, if that fails just copy

    try:

        action_runprog(RSYNC, ['-a','--delete',src + '/',dst], dry)

    except RunError:

        print "cp -r", src, dst

        if dry: return

        action_remove(dst, dry)

        shutil.copytree(src, dst, True)

def action_linktree(src, dst, dry):

    """Hard-links an entire directory tree. Same as copytree but the created

    files are hard-links not actual copies. Removes the existing destination.

    """

    action_remove(dst, dry)

    print "<cp with hardlinks> -r", src, dst

    if dry: return

    common.makeuser.linktree(src, dst)

def action_copylist(srclist, dst, dry, srcdir="."):

    """Copies all files in a list to a new location. The files in the list

    are read relative to the current directory, and their destinations are the

    same paths relative to dst. Creates all parent directories as necessary.

    srcdir is "." by default, can be overridden.

    """

    for srcfile in srclist:

        dstfile = os.path.join(dst, srcfile)

        srcfile = os.path.join(srcdir, srcfile)

        dstdir = os.path.split(dstfile)[0]

        if not os.path.isdir(dstdir):

            action_mkdir(dstdir, dry)

        print "cp -f", srcfile, dstfile

        if not dry:

            try:

                shutil.copyfile(srcfile, dstfile)

                shutil.copymode(srcfile, dstfile)

            except shutil.Error:

                pass

def action_copyfile(src, dst, dry):

    """Copies one file to a new location. Creates all parent directories

    as necessary.

    Warn if file not found.

    """

    dstdir = os.path.split(dst)[0]

    if not os.path.isdir(dstdir):

        action_mkdir(dstdir, dry)

    print "cp -f", src, dst

    if not dry:

        try:

            shutil.copyfile(src, dst)

            shutil.copymode(src, dst)

        except (shutil.Error, IOError), e:

            print "Warning: " + str(e)

def action_symlink(src, dst, dry):

    """Creates a symlink in a given location. Creates all parent directories

    as necessary.

    """

    dstdir = os.path.split(dst)[0]

    if not os.path.isdir(dstdir):

        action_mkdir(dstdir, dry)

    # Delete existing file

    if os.path.exists(dst):

        os.remove(dst)

    print "ln -fs", src, dst

    if not dry:

        os.symlink(src, dst)

def action_append(ivle_pth, ivle_www):

    file = open(ivle_pth, 'a+')

    file.write(ivle_www + '\n')

    file.close()

def action_chown_setuid(file, dry):

    """Chowns a file to root, and sets the setuid bit on the file.

    Calling this function requires the euid to be root.

    The actual mode of path is set to: rws--s--s

    """

    print "chown root:root", file

    if not dry:

        os.chown(file, 0, 0)

    print "chmod a+xs", file

    print "chmod u+rw", file

    if not dry:

        os.chmod(file, stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH

            | stat.S_ISUID | stat.S_IRUSR | stat.S_IWUSR)

def action_chmod_x(file, dry):

    """Chmod 755 a file (sets permissions to rwxr-xr-x)."""

    print "chmod 755", file

    if not dry:

        os.chmod(file, stat.S_IXUSR | stat.S_IRUSR | stat.S_IWUSR

            | stat.S_IXGRP | stat.S_IRGRP | stat.S_IXOTH | stat.S_IROTH)

def action_make_private(file, dry):

    """Ensures that a file is private to IVLE (chowns to www-data and chmod to 

    600)"""

    print "chown %s:%s %s"%(wwwuid, wwwuid, file)

    if not dry:

        os.chown(file, wwwuid, wwwuid)

    print "chmod 600", file

    if not dry:

        os.chmod(file, stat.S_IRUSR | stat.S_IWUSR)

def query_user(default, prompt):

    """Prompts the user for a string, which is read from a line of stdin.

    Exits silently if EOF is encountered. Returns the string, with spaces

    removed from the beginning and end.

    Returns default if a 0-length line (after spaces removed) was read.

    """

    sys.stdout.write('%s\n    (default: "%s")\n>' % (prompt, default))

    try:

        val = sys.stdin.readline()

    except KeyboardInterrupt:

        # Ctrl+C

        sys.stdout.write("\n")

        sys.exit(1)

    sys.stdout.write("\n")

    # If EOF, exit

    if val == '': sys.exit(1)

    # If empty line, return default

    val = val.strip()

    if val == '': return default

    return val

def filter_mutate(function, list):

    """Like built-in filter, but mutates the given list instead of returning a

    new one. Returns None."""

    i = len(list)-1

    while i >= 0:

        # Delete elements which do not match

        if not function(list[i]):

            del list[i]

        i -= 1

def get_svn_revision():

    """Returns either the current SVN revision of this build, or None"""

    try:

        svn = pysvn.Client()

        entry = svn.info('.')

        revnum = entry.revision.number

    except pysvn.ClientError, e:

        revnum = None

    return revnum