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# Copyright 2015 The Bazel Authors. All rights reserved.
#
# 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.
"""This tool build docker layer tar file from a list of inputs."""
import os
import os.path
import sys
import tarfile
import tempfile
from tools.build_defs.docker import archive
from third_party.py import gflags
gflags.DEFINE_string(
'output', None,
'The output file, mandatory')
gflags.MarkFlagAsRequired('output')
gflags.DEFINE_multistring(
'file', [],
'A file to add to the layer')
gflags.DEFINE_string(
'mode', None,
'Force the mode on the added files (in octal).')
gflags.DEFINE_multistring(
'tar', [],
'A tar file to add to the layer')
gflags.DEFINE_multistring(
'deb', [],
'A debian package to add to the layer')
gflags.DEFINE_multistring(
'link', [],
'Add a symlink a inside the layer ponting to b if a:b is specified')
gflags.RegisterValidator(
'link',
lambda l: all(value.find(':') > 0 for value in l),
message='--link value should contains a : separator')
gflags.DEFINE_string(
'directory', None,
'Directory in which to store the file inside the layer')
FLAGS = gflags.FLAGS
class DockerLayer(object):
"""A class to generates a Docker layer."""
class DebError(Exception):
pass
def __init__(self, output, directory):
self.directory = directory
self.output = output
def __enter__(self):
self.tarfile = archive.TarFileWriter(self.output)
return self
def __exit__(self, t, v, traceback):
self.tarfile.close()
def add_file(self, f, destfile, mode=None):
"""Add a file to the layer.
Args:
f: the file to add to the layer
destfile: the name of the file in the layer
mode: force to set the specified mode, by
default the value from the source is taken.
`f` will be copied to `self.directory/destfile` in the layer.
"""
dest = destfile.lstrip('/') # Remove leading slashes
# TODO(mattmoor): Consider applying the working directory to all four
# options, not just files...
if self.directory and self.directory != '/':
dest = self.directory.lstrip('/') + '/' + dest
# If mode is unspecified, derive the mode from the file's mode.
if mode is None:
mode = 0755 if os.access(f, os.X_OK) else 0644
self.tarfile.add_file(dest, file_content=f, mode=mode)
def add_tar(self, tar):
"""Add a tar file to the layer.
All files presents in that tar will be added to the layer under
the same paths. No user name nor group name will be added to
the layer.
Args:
tar: the tar file to add to the layer
"""
self.tarfile.add_tar(tar, numeric=True)
def add_link(self, symlink, destination):
"""Add a symbolic link pointing to `destination` in the layer.
Args:
symlink: the name of the symbolic link to add.
destination: where the symbolic link point to.
"""
self.tarfile.add_file(symlink, tarfile.SYMTYPE, link=destination)
def add_deb(self, deb):
"""Extract a debian package in the layer.
All files presents in that debian package will be added to the
layer under the same paths. No user name nor group names will
be added to the layer.
Args:
deb: the tar file to add to the layer
Raises:
DebError: if the format of the deb archive is incorrect.
This method does not support LZMA (data.tar.xz or data.tar.lzma)
for the data in the deb package. Using Python 3 would fix it.
"""
with archive.SimpleArFile(deb) as arfile:
current = arfile.next()
while current and not current.filename.startswith('data.'):
current = arfile.next()
if not current:
raise self.DebError(deb + ' does not contains a data file!')
tmpfile = tempfile.mkstemp(suffix=os.path.splitext(current.filename)[-1])
with open(tmpfile[1], 'wb') as f:
f.write(current.data)
self.add_tar(tmpfile[1])
os.remove(tmpfile[1])
def main(unused_argv):
force_mode = None
if FLAGS.mode:
# Convert from octal
force_mode = int(FLAGS.mode, 8)
with DockerLayer(FLAGS.output, FLAGS.directory) as layer:
for f in FLAGS.file:
(inf, tof) = f.split('=', 1)
layer.add_file(inf, tof, force_mode)
for tar in FLAGS.tar:
layer.add_tar(tar)
for deb in FLAGS.deb:
layer.add_deb(deb)
for link in FLAGS.link:
l = link.split(':', 1)
layer.add_link(l[0], l[1])
if __name__ == '__main__':
main(FLAGS(sys.argv))
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