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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 untar(tarfile, outdir):
"""Returns True if the untar dir differs from a pre-existing dir."""
tmp_dir = tempfile.mkdtemp()
try:
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
untar_outdir = os.path.join(tmp_dir, os.path.basename(outdir))
if os.path.exists(outdir):
diff = filecmp.dircmp(untar_outdir, outdir)
if not (diff.left_only + diff.right_only + diff.diff_files +
diff.common_funny + diff.funny_files):
# outdir already existed with exactly the same content.
return False
shutil.rmtree(outdir)
# The untar files are different, or there was no previous outdir.
print 'Updating', outdir
shutil.move(untar_outdir, outdir)
return True
finally:
if os.path.isdir(tmp_dir):
shutil.rmtree(tmp_dir)
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