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#!/usr/bin/env python
#
# Simple script to export a file from the datastore
# Reinier Heeres, <reinier@heeres.eu>, 2007-12-24
# Phil Bordelon <phil@thenexusproject.org>

import sys
import os
import shutil
import optparse

if os.path.exists("/tmp/olpc-session-bus"):
    os.environ["DBUS_SESSION_BUS_ADDRESS"] = "unix:path=/tmp/olpc-session-bus"

from sugar.datastore import datastore
import sugar.mime

# Limit the number of objects returned on an ambiguous query to this number,
# for quicker operation.
RETURN_LIMIT = 2

def build_option_parser():

    usage = "Usage: %prog [-o OBJECT_ID] [-q SEARCH_STR] [-m] OUTFILE"
    parser = optparse.OptionParser(usage=usage)

    parser.add_option("-o", "--object_id", action="store", dest="object_id",
                      help="Retrieve object with explicit ID OBJECT_ID", 
                      metavar="OBJECT_ID", default=None)

    parser.add_option("-q", "--query", action="store", dest="query",
                      help="Full-text-search the metadata for SEARCH_STR", 
                      metavar="SEARCH_STR", default=None)

    parser.add_option("-m", "--metadata", action="store_true", dest="show_meta",
                      help="Show all non-preview metadata [default: hide]", 
                      default=False)

    return parser

if __name__ == "__main__":

    parser = build_option_parser()
    options, args = parser.parse_args()
    if len(args) < 1:
        parser.print_help()
        exit(0)

    dsentry = None

    # Get object directly if we were given an explicit object ID.
    if options.object_id is not None:
        dsentry = datastore.get(options.object_id)

    # Compose the query based on the options provided.
    if dsentry is None:
        query = {}

        if options.query is not None:
            query['query'] = options.query

        # We only want a single file at a time; limit the number of objects
        # returned to two, as anything more than one means the criteria were
        # not limited enough.
        objects, count = datastore.find(query, limit=RETURN_LIMIT, sorting='-mtime')
        print '%r' % query
        if count > 1:
            print 'WARNING: %d objects found; retrieving most recent.' % (count)
            for i in xrange(1, RETURN_LIMIT):
                objects[i].destroy()

        if count > 0:
            dsentry = objects[0]

    # If neither an explicit object ID nor a query gave us data, fail.
    if dsentry is None:
        print 'ERROR: unable to determine journal object to copy.'
        parser.print_help()
        exit(0)

    # Print metadata if that is what the user asked for.
    if options.show_meta:
        print 'Metadata:'
        for key, val in dsentry.metadata.get_dictionary().iteritems():
            if key != 'preview':
                print '%20s -> %s' % (key, val)

    # If no file is associated with this object, we can't save it out.
    if dsentry.get_file_path() == "":
        print 'ERROR: no file associated with object, just metadata.'
        dsentry.destroy()
        exit(0)

    outname = args[0]
    outroot, outext = os.path.splitext(outname)

    # Do our best to determine the output file extension, based on Sugar's
    # MIME-type-to-extension mappings.
    if outext == "":
        mimetype = dsentry.metadata['mime_type']
        outext = sugar.mime.get_primary_extension(mimetype)
        if outext == None:
            outext = "dsobject"
        outext = '.' + outext    

    # Lastly, actually copy the file out of the datastore and onto the
    # filesystem.
    shutil.copyfile(dsentry.get_file_path(), outroot + outext)
    print '%s -> %s' % (dsentry.get_file_path(), outroot + outext)

    # Cleanup.
    dsentry.destroy()