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#! /usr/bin/env python
# Copyright 2016 WebAssembly Community Group participants
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import filecmp
import os
import shutil
import subprocess
import sys
import tempfile
def _open_archive(tarfile, tmp_dir):
with tempfile.TemporaryFile(mode='w+') as f:
try:
subprocess.check_call(['tar', '-xvf', tarfile], cwd=tmp_dir, stdout=f)
except:
f.seek(0)
sys.stderr.write(f.read())
raise
return os.listdir(tmp_dir)
def _files_same(dir1, dir2, basenames):
diff = filecmp.cmpfiles(dir1, dir2, basenames)
return 0 == len(diff[1] + diff[2])
def _dirs_same(dir1, dir2, basenames):
for d in basenames:
diff = filecmp.dircmp(os.path.join(dir1, d), os.path.join(dir2, d))
if 0 != len(diff.left_only + diff.right_only + diff.diff_files +
diff.common_funny + diff.funny_files):
return False
return True
def _move_files(dirfrom, dirto, basenames):
for f in basenames:
from_file = os.path.join(dirfrom, f)
to_file = os.path.join(dirto, f)
if os.path.isfile(to_file):
os.path.remove(to_file)
shutil.move(from_file, to_file)
def _move_dirs(dirfrom, dirto, basenames):
for d in basenames:
from_dir = os.path.join(dirfrom, d)
to_dir = os.path.join(dirto, d)
if os.path.isdir(to_dir):
shutil.rmtree(to_dir)
shutil.move(from_dir, to_dir)
def untar(tarfile, outdir):
"""Returns True if untar content differs from pre-existing outdir content."""
tmpdir = tempfile.mkdtemp()
try:
untared = _open_archive(tarfile, tmpdir)
files = [f for f in untared if os.path.isfile(os.path.join(tmpdir, f))]
dirs = [d for d in untared if os.path.isdir(os.path.join(tmpdir, d))]
assert len(files) + len(dirs) == len(untared), 'Only files and directories'
if _files_same(tmpdir, outdir, files) and _dirs_same(tmpdir, outdir, dirs):
# Nothing new or different in the tarfile.
return False
# Some or all of the files / directories are new.
_move_files(tmpdir, outdir, files)
_move_dirs(tmpdir, outdir, dirs)
return True
finally:
if os.path.isdir(tmpdir):
shutil.rmtree(tmpdir)
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