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#!/usr/bin/python
#
# Copyright (C) 2010, Nokia <ivan.frade@nokia.com>
# Copyright (C) 2016, Sam Thursfield <sam@afuera.me.uk>
#
# 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 Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
from common.utils import configuration as cfg
from common.utils.helpers import log
import json
import os
import subprocess
def get_tracker_extract_jsonld_output(filename, mime_type=None):
"""
Runs `tracker-extract --file` to extract metadata from a file.
"""
tracker = os.path.join (cfg.BINDIR, 'tracker')
command = [tracker, 'extract', '--verbosity=errors', '--output-format=json-ld', filename]
if mime_type is not None:
command.extend(['--mime', mime_type])
try:
log ('Running: %s' % ' '.join(command))
output = subprocess.check_output (command)
except subprocess.CalledProcessError as e:
raise RuntimeError("Error %i from tracker-extract, see stderr for "
"details" % e.returncode)
try:
data = json.loads (output)
except ValueError as e:
raise RuntimeError("Invalid JSON returned by tracker-extract: "
"%s.\nOutput was: %s" % (e, output))
return data
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