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

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#!/usr/bin/env python
# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2009 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

# Program: Fetch Submissions
# Author:  Matt Giuca

# Script to retrieve all submissions for a particular project.
# Requires root to run.

from __future__ import with_statement

import sys
import os
import shutil
import datetime
import codecs
import optparse
import zipfile
import traceback

import pysvn

if os.getuid() != 0:
    print >>sys.stderr, "Must run %s as root." % os.path.basename(sys.argv[0])
    sys.exit()

import ivle.config
import ivle.database
import ivle.util

from ivle.database import Project, ProjectSet, Offering, Subject

# Is Python version 2.6 or higher?
PYTHON26 = map(int, sys.version[:3].split('.')) >= [2, 6]

def fetch_submission(submission, target, svnclient, config, zip=False,
    txt=False, verbose=False):
    """Fetch a submission from a user's repository, and dump it in a given
    directory.
    @param submission: Submission object, detailing the submission.
    @param target: Target directory for the project (will create a
        subdirectory for each submission).
    @param svnclient: pysvn.Client object.
    @param config: Config object.
    @param zip: If True, zips up the submission.
    @param txt: If True, writes an extra text file with metadata about the
        submission.
    @param verbose: If True, writes the name of each submission to stdout.
    """
    # submission_name is the name of the user or group who owns the repo
    submission_name = submission.assessed.principal.short_name
    # target_final is the directory to place the files in
    target_final = os.path.join(target,
                                submission.assessed.principal.short_name)
    target_final = target_final.encode('utf-8')
    if os.path.exists(target_final):
        # Remove the existing file or directory before re-checking out
        if os.path.isdir(target_final):
            ivle.util.safe_rmtree(target_final)
        else:
            os.remove(target_final)
    url = get_repo_url(submission, config)
    revision = pysvn.Revision(pysvn.opt_revision_kind.number,
                              submission.revision)
    svnclient.export(url, target_final, force=True,
        revision=revision, recurse=True)

    if txt:
        # info_final is the directory to place the metadata info files in
        info_final = target_final + ".txt"
        write_submission_info(info_final, submission)

    # If required, zip up the directory
    if zip:
        make_zip(target_final, target_final + ".zip")
        # Remove the target tree
        if os.path.isdir(target_final):
            ivle.util.safe_rmtree(target_final)
        else:
            os.remove(target_final)

    if verbose:
        print "Exported submission by: %s (%s)" % (
            submission.assessed.principal.short_name,
            submission.assessed.principal.display_name)

def get_repo_url(submission, config):
    """Gets a local (file:) URL to the repository for a given submission.
    This will consult submission.path to find the path within the repository
    to check out.
    @param submission: Submission object, detailing the submission.
    @param config: Config object.
    """
    # NOTE: This code is mostly copied from services/usrmgt-server
    if submission.assessed.is_group:
        # The offering this group is in
        offering = submission.assessed.project.project_set.offering
        groupname = submission.assessed.principal.short_name
        # The name of the repository directory within 'groups' is
        # SUBJECT_YEAR_SEMESTER_GROUP
        namespace = "_".join([offering.subject.short_name,
            offering.semester.year, offering.semester.semester, groupname])
        repo_path = os.path.join(config['paths']['svn']['repo_path'],
                                'groups', namespace)
    else:
        # The name of the repository directory within 'users' is the username
        username = submission.assessed.principal.short_name
        repo_path = os.path.join(config['paths']['svn']['repo_path'],
                                'users', username)

    path_in_repo = submission.path
    # Change an absolute path into a relative one (to the top of SVN)
    if path_in_repo[:1] == os.sep or path_in_repo[:1] == os.altsep:
        path_in_repo = path_in_repo[1:]

    # Attach "file://" to the front of the absolute path, to make it a URL
    return "file://" + os.path.join(os.path.abspath(repo_path), path_in_repo)

def make_zip(source, dest):
    """Zip up a directory tree or file. The ZIP file will always contain just
    a single directory or file at the top level (it will not be a ZIP bomb).
    XXX In Python 2.5 and earlier, this does NOT create empty directories
    (it's not possible with the Python2.5 version of zipfile).
    @param source: Path to a directory or file to zip up.
    @param dest: Path to a zip file to create.
    """
    # NOTE: This code is mostly copied from ivle.zip (but very different)
    zip = zipfile.ZipFile(dest, 'w')

    # Write the source file/directory itself
    # (If this is a directory it will NOT recurse)
    if PYTHON26 or not os.path.isdir(source):
        # Python < 2.6 errors if you add a directory
        # (This means you can't add an empty directory)
        zip.write(source, os.path.basename(source))

    if os.path.isdir(source):
        # All paths within the zip file are relative to relativeto
        relativeto = os.path.dirname(source)
        # Write the top-level directory
        # Walk the directory tree
        def error(err):
            raise OSError("Could not access a file (zipping)")
        for (dirpath, dirnames, filenames) in \
            os.walk(source, onerror=error):
            arc_dirpath = ivle.util.relpath(dirpath, relativeto)
            # Python < 2.6 errors if you add a directory
            # (This means you can't add an empty directory)
            if PYTHON26:
                filenames = dirnames + filenames
            for filename in filenames:
                zip.write(os.path.join(dirpath, filename),
                            os.path.join(arc_dirpath, filename))

    if not PYTHON26:
        # XXX Write this _didModify attribute of zip, to trick it into writing
        # footer bytes even if there are no files in the archive (otherwise it
        # writes a 0-byte archive which is invalid).
        # Note that in Python2.6 we avoid this by always writing the top-level
        # file or directory, at least.
        zip._didModify = True
    zip.close()

def write_submission_info(filename, submission):
    """Write human-readable meta-data about a submission to a file.
    @param filename: Filename to write to.
    @param submission: Submission object.
    """
    with codecs.open(filename, 'w', 'utf-8') as f:
        if submission.assessed.is_group:
            # A group project
            print >>f, "Group: %s (%s)" % (
                submission.assessed.principal.short_name,
                submission.assessed.principal.display_name)
        else:
            # A solo project
            # Only show the two fields if they are different (only in rare
            # circumstances)
            if submission.assessed.principal != submission.submitter:
                print >>f, "Author: %s (%s)" % (
                    submission.assessed.principal.short_name,
                    submission.assessed.principal.display_name)
        print >>f, "Submitter: %s (%s)" % (
            submission.submitter.short_name,
            submission.submitter.display_name)
        print >>f, "Date: %s" % (
            submission.date_submitted.strftime("%Y-%m-%d %H:%M:%S"))
        print >>f, "SVN Revision: %s" % submission.revision
        print >>f, "SVN Path: %s" % submission.path

def main(argv=None):
    global store
    if argv is None:
        argv = sys.argv

    usage = """usage: %prog [options] subject projname
    (requires root)
    Retrieves all submissions for a given project. Places each submission in
    its own directory, in a subdirectory of '.'. Any errors are reported to
    stderr (otherwise is silent).
    subject/projname is the subject/project's short name.
    """

    # Parse arguments
    parser = optparse.OptionParser(usage)
    parser.add_option("-s", "--semester",
        action="store", dest="semester", metavar="YEAR/SEMESTER",
        help="Semester of the subject's offering (eg. 2009/1). "
             "Defaults to the currently active semester.",
        default=None)
    parser.add_option("-d", "--dest",
        action="store", dest="dest", metavar="PATH",
        help="Destination directory (default to '.', creates a subdirectory, "
            "so will not pollute PATH).",
        default=".")
    parser.add_option("-z", "--zip",
        action="store_true", dest="zip",
        help="Store each submission in a Zip file.",
        default=False)
    parser.add_option("-v", "--verbose",
        action="store_true", dest="verbose",
        help="Print out the name of each submission as it is extracted.",
        default=False)
    parser.add_option("--no-txt",
        action="store_false", dest="txt",
        help="Disable writing a text file with data about each submission.",
        default=True)
    (options, args) = parser.parse_args(argv[1:])

    if len(args) < 2:
        parser.print_help()
        parser.exit()

    subject_name = unicode(args[0])
    project_name = unicode(args[1])

    if options.semester is None:
        year, semester = None, None
    else:
        try:
            year, semester = options.semester.split('/')
            if len(year) == 0 or len(semester) == 0:
                raise ValueError()
        except ValueError:
            parser.error('Invalid semester (must have form "year/semester")')

    svnclient = pysvn.Client()
    config = ivle.config.Config(plugins=False)
    store = ivle.database.get_store(config)

    # Get the subject from the DB
    subject = store.find(Subject,
                     Subject.short_name == subject_name).one()
    if subject is None:
        print >>sys.stderr, "No subject with short name '%s'" % subject_name
        return 1

    # Get the offering from the DB
    if semester is None:
        # None specified - get the current offering from the DB
        offerings = list(subject.active_offerings())
        if len(offerings) == 0:
            print >>sys.stderr, ("No active offering for subject '%s'"
                                 % subject_name)
            return 1
        elif len(offerings) > 1:
            print >>sys.stderr, ("Multiple active offerings for subject '%s':"
                                 % subject_name)
            print >>sys.stderr, "Please use one of:"
            for offering in offerings:
                print >>sys.stderr, ("    --semester=%s/%s"
                    % (offering.semester.year, offering.semester.semester))
            return 1
        else:
            offering = offerings[0]
    else:
        # Get the offering for the specified semester
        offering = subject.offering_for_semester(year, semester)
        if offering is None:
            print >>sys.stderr, (
                "No offering for subject '%s' in semester %s/%s"
                % (subject_name, year, semester))
            return 1

    # Get the project from the DB
    project = store.find(Project,
                         Project.project_set_id == ProjectSet.id,
                         ProjectSet.offering == offering,
                         Project.short_name == project_name).one()
    if project is None:
        print >>sys.stderr, "No project with short name '%s'" % project_name
        return 1

    # Target directory is DEST/subject/year/semester/project
    target_dir = os.path.join(options.dest, subject_name,
        offering.semester.year, offering.semester.semester, project_name)
    if not os.path.exists(target_dir):
        os.makedirs(target_dir)

    for submission in project.latest_submissions:
        try:
            fetch_submission(submission, target_dir, svnclient, config,
                             zip=options.zip, txt=options.txt,
                             verbose=options.verbose)
        except Exception, e:
            # Catch all exceptions (to ensure if one student has a problem, it
            # is reported, and we can continue)
            print >>sys.stderr, "ERROR on submission for %s:" % (
                submission.assessed.principal.display_name)
            traceback.print_exc()

if __name__ == "__main__":
    sys.exit(main(sys.argv))