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extract.py
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extract.py
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# import_dsc.py -- Import a series of .dsc files.
# Copyright (C) 2007 James Westby <jw+debian@jameswestby.net>
# (C) 2008 Canonical Ltd.
#
# This file is part of bzr-builddeb.
#
# bzr-builddeb 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.
#
# bzr-builddeb 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 bzr-builddeb; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
from contextlib import ExitStack
import os
import subprocess
import tempfile
from debian.changelog import Version
from ... import osutils
from ...trace import mutter
from .util import (
FORMAT_1_0,
FORMAT_3_0_QUILT,
FORMAT_3_0_NATIVE,
component_from_orig_tarball,
subprocess_setup,
)
class SourceExtractor:
"""A class to extract a source package to its constituent parts"""
def __init__(self, dsc_path, dsc, apply_patches: bool = False):
self.dsc_path = dsc_path
self.dsc = dsc
self.extracted_upstream = None
self.extracted_debianised = None
self.unextracted_debian_md5 = None
self.apply_patches = apply_patches
self.upstream_tarballs = []
self.exit_stack = ExitStack()
def extract(self):
"""Extract the package to a new temporary directory."""
raise NotImplementedError(self.extract)
def __enter__(self):
self.exit_stack.__enter__()
self.extract()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.exit_stack.__exit__(exc_type, exc_val, exc_tb)
return False
class OneZeroSourceExtractor(SourceExtractor):
"""Source extract for the "1.0" source format."""
def extract(self):
"""Extract the package to a new temporary directory."""
tempdir = self.exit_stack.enter_context(tempfile.TemporaryDirectory())
dsc_filename = os.path.abspath(self.dsc_path)
proc = subprocess.Popen(
["dpkg-source", "-su", "-x", dsc_filename],
cwd=tempdir, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, preexec_fn=subprocess_setup)
(stdout, _) = proc.communicate()
assert proc.returncode == 0, "dpkg-source -x failed, output:\n%s" % \
(stdout,)
name = self.dsc['Source']
version = Version(self.dsc['Version'])
self.extracted_upstream = os.path.join(
tempdir, "{}-{}.orig".format(name, str(version.upstream_version)))
self.extracted_debianised = os.path.join(
tempdir, "{}-{}".format(name, str(version.upstream_version)))
if not os.path.exists(self.extracted_upstream):
mutter("It's a native package")
self.extracted_upstream = None
for part in self.dsc['files']:
if self.extracted_upstream is None:
if part['name'].endswith(".tar.gz"):
self.unextracted_debian_md5 = part['md5sum']
else:
if part['name'].endswith(".orig.tar.gz"):
self.upstream_tarballs.append((os.path.abspath(
os.path.join(
osutils.dirname(self.dsc_path),
part['name'])),
component_from_orig_tarball(
part['name'], name,
str(version.upstream_version)),
str(part['md5sum'])))
elif part['name'].endswith(".diff.gz"):
self.unextracted_debian_md5 = part['md5sum']
class ThreeDotZeroNativeSourceExtractor(SourceExtractor):
"""Source extractor for the "3.0 (native)" source format."""
def extract(self):
tempdir = self.exit_stack.enter_context(tempfile.TemporaryDirectory())
dsc_filename = os.path.abspath(self.dsc_path)
proc = subprocess.Popen(
['dpkg-source', '-x', dsc_filename],
cwd=tempdir, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, preexec_fn=subprocess_setup)
(stdout, _) = proc.communicate()
assert proc.returncode == 0, "dpkg-source -x failed, output:\n%s" % \
(stdout,)
name = self.dsc['Source']
version = Version(self.dsc['Version'])
self.extracted_debianised = os.path.join(
tempdir, "{}-{}".format(name, str(version.upstream_version)))
self.extracted_upstream = None
for part in self.dsc['files']:
if (part['name'].endswith(".tar.gz")
or part['name'].endswith(".tar.bz2")
or part['name'].endswith(".tar.xz")):
self.unextracted_debian_md5 = part['md5sum']
class ThreeDotZeroQuiltSourceExtractor(SourceExtractor):
"""Source extractor for the "3.0 (quilt)" source format."""
def extract(self):
tempdir = self.exit_stack.enter_context(tempfile.TemporaryDirectory())
dsc_filename = os.path.abspath(self.dsc_path)
args = ['--no-preparation']
if not self.apply_patches:
args.extend(['--skip-patches', '--unapply-patches'])
else:
args.extend(['--no-unapply-patches'])
proc = subprocess.Popen(
['dpkg-source', '-x', '--skip-debianization'] + args
+ [dsc_filename],
cwd=tempdir, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, preexec_fn=subprocess_setup)
(stdout, _) = proc.communicate()
assert proc.returncode == 0, "dpkg-source -x failed, output:\n%s" % \
(stdout,)
name = self.dsc['Source']
version = Version(self.dsc['Version'])
self.extracted_debianised = os.path.join(
tempdir, "{}-{}".format(name, str(version.upstream_version)))
self.extracted_upstream = self.extracted_debianised + ".orig"
os.rename(self.extracted_debianised, self.extracted_upstream)
proc = subprocess.Popen(
['dpkg-source', '-x'] + args + [dsc_filename],
cwd=tempdir, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, preexec_fn=subprocess_setup)
(stdout, _) = proc.communicate()
assert proc.returncode == 0, "dpkg-source -x failed, output:\n%s" % \
(stdout,)
# Check that there are no unreadable files extracted.
subprocess.call(
["find", self.extracted_upstream, "-perm",
"0000", "-exec", "chmod", "644", "{}", ";"])
subprocess.call(
["find", self.extracted_debianised, "-perm",
"0000", "-exec", "chmod", "644", "{}", ";"])
for part in self.dsc['files']:
if (part['name'].startswith(
"{}_{}.orig".format(name, str(version.upstream_version)))
and not part['name'].endswith('.asc')):
self.upstream_tarballs.append((
os.path.abspath(os.path.join(
osutils.dirname(self.dsc_path), part['name'])),
component_from_orig_tarball(
part['name'], name, str(version.upstream_version)),
str(part['md5sum'])))
elif (part['name'].endswith(".debian.tar.gz")
or part['name'].endswith(".debian.tar.bz2")
or part['name'].endswith(".debian.tar.xz")):
self.unextracted_debian_md5 = str(part['md5sum'])
assert self.upstream_tarballs is not None, \
"Can't handle non gz|bz2|xz tarballs yet"
assert self.unextracted_debian_md5 is not None, \
"Can't handle non gz|bz2|xz tarballs yet"
SOURCE_EXTRACTORS = {}
SOURCE_EXTRACTORS[FORMAT_1_0] = OneZeroSourceExtractor
SOURCE_EXTRACTORS[FORMAT_3_0_NATIVE] = ThreeDotZeroNativeSourceExtractor
SOURCE_EXTRACTORS[FORMAT_3_0_QUILT] = ThreeDotZeroQuiltSourceExtractor
def extract(dsc_filename: str, dsc: str, *,
apply_patches: bool = False) -> None:
format = dsc.get('Format', FORMAT_1_0).strip()
extractor_cls = SOURCE_EXTRACTORS.get(format)
if extractor_cls is None:
raise AssertionError(
"Don't know how to import source format %s yet" % format)
return extractor_cls(dsc_filename, dsc, apply_patches=apply_patches)