def compute_digests(rootdir, paths, num_threads=None):
"""Return a dict with (path, digest)."""
# First, we write the temporary file with filenames in the format
# expected by hashdeep
rootdir = os.path.normpath(rootdir)
fd, tempfilename = tempfile.mkstemp()
with os.fdopen(fd, 'w') as tmpfile:
for p in paths:
tmpfile.write(utils.build_native_path(rootdir, p))
tmpfile.write('\n')
# Run hashdeep -c sha1,sha256 -f tempfilename -l -d (-j num_threads)
cmd = ['hashdeep', '-c', 'sha1,sha256', '-f', tempfilename, '-l', '-d']
if num_threads is not None:
cmd.extend(['-j', str(num_threads)])
output = subprocess.check_output(cmd)
# Delete temporary file
os.remove(tempfilename)
# Parse output
root = ET.fromstring(output)
res = {}
for fileobj in root:
if fileobj.tag != 'fileobject':
continue
name = None
sha1 = None
sha256 = None
for child in fileobj:
if child.tag == 'hashdigest':
if child.attrib['type'] == 'SHA1':
sha1 = child.text
elif child.attrib['type'] == 'SHA256':
sha256 = child.text
else:
raise ValueError('Unexpected hash type "{}".'.format(
child.attrib['type']))
if child.tag == 'filename':
name = utils.get_path_from_native_path(rootdir, child.text)
if not name or not sha1 or not sha256:
raise ValueError('Could not extract all required information from '
'digest.')
res[name] = Digest(sha1, sha256)
keys = res.keys()
if len(keys) != len(paths) or set(keys) != set(paths):
raise ValueError('List of filenames returned by hashdeep does not '
'match the input list.')
return res
def assemble_paths(rootdir, patterns):
filenames = []
symlinks = []
directories = []
errors = []
ignored = []
def listdir_onerror(error):
errors.append(error)
rootdir = os.path.normpath(rootdir)
# Handle root separately because the os.walk code below is not going to
# process it.
decision = pattern_decision(os.sep, patterns)
if decision == INCLUDE:
# If we want to include the directory entry, we have to find out
# its type.
if os.path.isdir(rootdir):
directories.append(os.sep)
else:
raise ValueError('The root is not a directory, which should not happen.')
elif decision != EXCLUDE:
raise ValueError('Unknown file decision {}.'.format(decision))
# Now recursively traverse the file system
for root, dirs, files in os.walk(rootdir, topdown=True,
onerror=listdir_onerror, followlinks=False):
for f in itertools.chain(files, dirs):
native_path = os.path.join(root, f)
path = utils.get_path_from_native_path(rootdir, native_path)
decision = pattern_decision(path, patterns)
if decision == INCLUDE:
# If we want to include the directory entry, we have to find out
# its type.
if os.path.islink(native_path):
symlinks.append(path)
elif os.path.isfile(native_path):
filenames.append(path)
elif os.path.isdir(native_path):
directories.append(path)
else:
ignored.append(path)
elif decision != EXCLUDE:
raise ValueError('Unknown file decision {}.'.format(decision))
# Also, we remove all mount points from dirs so that os.walk does not
# recurse into a different file system.
dirs[:] = [d for d in dirs if not os.path.ismount(os.path.join(rootdir, d))]
return MatchingResult(filenames, symlinks, directories, errors, ignored)
def scan_backup(rootdir):
files = []
symlinks = []
directories = []
errors = []
ignored = []
def listdir_onerror(error):
errors.append(error)
rootdir = os.path.normpath(rootdir)
if os.path.isdir(rootdir):
directories.append(os.sep)
else:
raise ValueError('The root is not a directory, which should not happen.')
# Now recursively traverse the file system
for root, cur_dirs, cur_files in os.walk(rootdir,
topdown=True,
onerror=listdir_onerror,
followlinks=False):
for f in itertools.chain(cur_files, cur_dirs):
native_path = os.path.join(root, f)
path = utils.get_path_from_native_path(rootdir, native_path)
if path == '/.go_backup':
ignored.append(path)
elif os.path.islink(native_path):
symlinks.append(path)
elif os.path.isfile(native_path):
files.append(path)
elif os.path.isdir(native_path):
directories.append(path)
else:
ignored.append(path)
# Also, we remove all mount points from dirs so that os.walk does not
# recurse into a different file system.
cur_dirs[:] = [d for d in cur_dirs if not os.path.ismount(os.path.join(rootdir, d))]
return ScanResult(files, symlinks, directories, errors, ignored)
def test_get_path_from_native_path_non_normalized_rootdir():
rootdir = '//foo'
native_path = '/foo'
with pytest.raises(ValueError):
res = utils.get_path_from_native_path(rootdir, native_path)
def test_get_path_from_native_path_non_absolute_native_path():
rootdir = '/'
native_path = 'foo'
with pytest.raises(ValueError):
res = utils.get_path_from_native_path(rootdir, native_path)
def test_get_path_from_native_path_equal_paths():
rootdir = '/home/x'
native_path = '/home/x'
res = utils.get_path_from_native_path(rootdir, native_path)
assert res == '/'
def test_get_path_from_native_path_both_dirs_base():
rootdir = '/'
native_path = '/'
res = utils.get_path_from_native_path(rootdir, native_path)
assert res == '/'
def test_get_path_from_native_path_base_rootdir():
rootdir = '/'
native_path = '/foo/bar'
res = utils.get_path_from_native_path(rootdir, native_path)
assert res == '/foo/bar'
def test_get_path_from_native_path_simple_2():
rootdir = '/foo'
native_path = '/foo/bar/baz'
res = utils.get_path_from_native_path(rootdir, native_path)
assert res == '/bar/baz'
def test_get_path_from_native_path_simple_1():
rootdir = '/home/x'
native_path = '/home/x/foo'
res = utils.get_path_from_native_path(rootdir, native_path)
assert res == '/foo'
def test_get_path_from_native_path_out_of_dir_path_1():
rootdir = '/foo/bar'
native_path = '/foobar'
with pytest.raises(ValueError):
res = utils.get_path_from_native_path(rootdir, native_path)
