mirror of
https://github.com/nexus-stc/hyperboria
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334 lines
11 KiB
Python
334 lines
11 KiB
Python
# Copyright 2015 The Bazel Authors. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""A simple cross-platform helper to create a debian package."""
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import gzip
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import hashlib
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import os.path
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import sys
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import tarfile
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import textwrap
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import time
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from io import BytesIO
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import gflags
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# list of debian fields : (name, mandatory, wrap[, default])
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# see http://www.debian.org/doc/debian-policy/ch-controlfields.html
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DEBIAN_FIELDS = [
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('Package', True, False),
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('Version', True, False),
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('Section', False, False, 'contrib/devel'),
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('Priority', False, False, 'optional'),
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('Architecture', False, False, 'all'),
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('Depends', False, True, []),
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('Recommends', False, True, []),
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('Replaces', False, True, []),
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('Suggests', False, True, []),
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('Enhances', False, True, []),
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('Conflicts', False, True, []),
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('Pre-Depends', False, True, []),
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('Installed-Size', False, False),
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('Maintainer', True, False),
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('Description', True, True),
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('Homepage', False, False),
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('Built-Using', False, False, 'Bazel'),
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('Distribution', False, False, 'unstable'),
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('Urgency', False, False, 'medium'),
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]
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gflags.DEFINE_string('output', None, 'The output file, mandatory')
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gflags.MarkFlagAsRequired('output')
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gflags.DEFINE_string('changes', None, 'The changes output file, mandatory.')
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gflags.MarkFlagAsRequired('changes')
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gflags.DEFINE_string('data', None,
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'Path to the data tarball, mandatory')
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gflags.MarkFlagAsRequired('data')
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gflags.DEFINE_string('preinst', None,
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'The preinst script (prefix with @ to provide a path).')
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gflags.DEFINE_string('postinst', None,
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'The postinst script (prefix with @ to provide a path).')
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gflags.DEFINE_string('prerm', None,
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'The prerm script (prefix with @ to provide a path).')
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gflags.DEFINE_string('postrm', None,
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'The postrm script (prefix with @ to provide a path).')
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# see
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# https://www.debian.org/doc/manuals/debian-faq/ch-pkg_basics.en.html#s-conffile
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gflags.DEFINE_multistring(
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'conffile', None,
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'List of conffiles (prefix item with @ to provide a path)'
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)
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def make_gflags():
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for field in DEBIAN_FIELDS:
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fieldname = field[0].replace('-', '_').lower()
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msg = 'The value for the %s content header entry.' % field[0]
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if len(field) > 3:
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if type(field[3]) is list:
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gflags.DEFINE_multistring(fieldname, field[3], msg)
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else:
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gflags.DEFINE_string(fieldname, field[3], msg)
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else:
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gflags.DEFINE_string(fieldname, None, msg)
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if field[1]:
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gflags.MarkFlagAsRequired(fieldname)
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def add_ar_file_entry(fileobj, filename,
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content='', timestamp=0,
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owner_id=0, group_id=0, mode=0o644):
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"""Add a AR file entry to fileobj."""
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inputs = [
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(filename + '/').ljust(16), # filename (SysV)
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str(timestamp).ljust(12), # timestamp
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str(owner_id).ljust(6), # owner id
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str(group_id).ljust(6), # group id
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format(mode, 'o').ljust(8), # mode
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str(len(content)).ljust(10), # size
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'\x60\x0a', # end of file entry
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]
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for i in inputs:
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fileobj.write(i.encode('ascii'))
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fileobj.write(content)
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if len(content) % 2 != 0:
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fileobj.write(b'\n') # 2-byte alignment padding
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def make_debian_control_field(name, value, wrap=False):
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"""Add a field to a debian control file."""
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result = name + ': '
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if type(value) is list:
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value = ', '.join(value)
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if wrap:
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result += ' '.join(value.split('\n'))
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result = textwrap.fill(result,
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break_on_hyphens=False,
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break_long_words=False)
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else:
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result += value
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return result.replace('\n', '\n ') + '\n'
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def create_deb_control(extra_files=None, **kwargs):
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"""Create the control.tar.gz file."""
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# create the control file
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controlfile = ''
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for values in DEBIAN_FIELDS:
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fieldname = values[0]
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key = fieldname[0].lower() + fieldname[1:].replace('-', '')
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if values[1] or (key in kwargs and kwargs[key]):
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controlfile += make_debian_control_field(fieldname, kwargs[key], values[2])
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# Create the control.tar file
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tar = BytesIO()
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with gzip.GzipFile('control.tar.gz', mode='w', fileobj=tar, mtime=0) as gz:
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with tarfile.open('control.tar.gz', mode='w', fileobj=gz) as f:
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tarinfo = tarfile.TarInfo('control')
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tarinfo.size = len(controlfile)
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f.addfile(tarinfo, fileobj=BytesIO(controlfile.encode('utf-8')))
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if extra_files:
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for name, (data, mode) in extra_files.items():
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tarinfo = tarfile.TarInfo(name)
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tarinfo.size = len(data)
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tarinfo.mode = mode
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f.addfile(tarinfo, fileobj=BytesIO(data.encode('utf-8')))
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control = tar.getvalue()
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tar.close()
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return control
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def create_deb(output,
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data,
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preinst=None,
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postinst=None,
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prerm=None,
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postrm=None,
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conffiles=None,
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**kwargs):
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"""Create a full debian package."""
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extrafiles = {}
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if preinst:
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extrafiles['preinst'] = (preinst, 0o755)
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if postinst:
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extrafiles['postinst'] = (postinst, 0o755)
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if prerm:
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extrafiles['prerm'] = (prerm, 0o755)
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if postrm:
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extrafiles['postrm'] = (postrm, 0o755)
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if conffiles:
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extrafiles['conffiles'] = ('\n'.join(conffiles), 0o644)
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control = create_deb_control(extra_files=extrafiles, **kwargs)
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# Write the final AR archive (the deb package)
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with open(output, 'wb') as f:
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f.write(b'!<arch>\n') # Magic AR header
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add_ar_file_entry(f, 'debian-binary', b'2.0\n')
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add_ar_file_entry(f, 'control.tar.gz', control)
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# Tries to preserve the extension name
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ext = os.path.basename(data).split('.')[-2:]
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if len(ext) < 2:
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ext = 'tar'
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elif ext[1] == 'tgz':
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ext = 'tar.gz'
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elif ext[1] == 'tar.bzip2':
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ext = 'tar.bz2'
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else:
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ext = '.'.join(ext)
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if ext not in ['tar.bz2', 'tar.gz', 'tar.xz', 'tar.lzma']:
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ext = 'tar'
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with open(data, 'rb') as datafile:
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data = datafile.read()
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add_ar_file_entry(f, 'data.' + ext, data)
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def get_checksums_from_file(filename, hash_fns=None):
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"""Computes MD5 and/or other checksums of a file.
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Args:
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filename: Name of the file.
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hash_fns: Mapping of hash functions.
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Default is {'md5': hashlib.md5}
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Returns:
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Mapping of hash names to hexdigest strings.
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{ <hashname>: <hexdigest>, ... }
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"""
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hash_fns = hash_fns or {'md5': hashlib.md5}
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checksums = {k: fn() for (k, fn) in hash_fns.items()}
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with open(filename, 'rb') as file_handle:
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while True:
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buf = file_handle.read(1048576) # 1 MiB
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if not buf:
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break
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for hashfn in checksums.values():
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hashfn.update(buf)
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return {k: fn.hexdigest() for (k, fn) in checksums.items()}
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def create_changes(output,
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deb_file,
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architecture,
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short_description,
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maintainer,
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package,
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version,
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section,
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priority,
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distribution,
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urgency,
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timestamp=0):
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"""Create the changes file."""
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checksums = get_checksums_from_file(
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deb_file, {
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'md5': hashlib.md5,
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'sha1': hashlib.sha1,
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'sha256': hashlib.sha256,
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},
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)
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debsize = str(os.path.getsize(deb_file))
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deb_basename = os.path.basename(deb_file)
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changesdata = ''.join(
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(make_debian_control_field(*x) for x in [
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('Format', '1.8'),
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('Date', time.ctime(timestamp)),
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('Source', package),
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('Binary', package),
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('Architecture', architecture),
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('Version', version),
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('Distribution', distribution),
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('Urgency', urgency),
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('Maintainer', maintainer),
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('Changed-By', maintainer),
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('Description', '\n%s - %s' % (package, short_description)),
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('Changes', '\n%s (%s) %s; urgency=%s\nChanges are tracked in revision control.' % (
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package, version, distribution, urgency
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)),
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('Files', '\n' + ' '.join([checksums['md5'], debsize, section, priority, deb_basename])),
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('Checksums-Sha1', '\n' + ' '.join([checksums['sha1'], debsize, deb_basename])),
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('Checksums-Sha256', '\n' + ' '.join([checksums['sha256'], debsize, deb_basename])),
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]),
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)
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with open(output, 'w') as changes_fh:
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changes_fh.write(changesdata)
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def get_flag_value(flagvalue, strip=True):
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if flagvalue:
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if flagvalue[0] == '@':
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with open(flagvalue[1:], 'r') as f:
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flagvalue = f.read()
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if strip:
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return flagvalue.strip()
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return flagvalue
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def get_flag_values(flagvalues):
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if flagvalues:
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return [get_flag_value(f, False) for f in flagvalues]
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else:
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return None
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def main(unused_argv):
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create_deb(
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FLAGS.output,
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FLAGS.data,
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preinst=get_flag_value(FLAGS.preinst, False),
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postinst=get_flag_value(FLAGS.postinst, False),
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prerm=get_flag_value(FLAGS.prerm, False),
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postrm=get_flag_value(FLAGS.postrm, False),
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conffiles=get_flag_values(FLAGS.conffile),
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package=FLAGS.package,
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version=get_flag_value(FLAGS.version),
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description=get_flag_value(FLAGS.description),
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maintainer=FLAGS.maintainer,
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section=FLAGS.section,
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architecture=FLAGS.architecture,
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depends=FLAGS.depends,
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suggests=FLAGS.suggests,
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enhances=FLAGS.enhances,
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pre_depends=FLAGS.pre_depends,
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recommends=FLAGS.recommends,
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replaces=FLAGS.replaces,
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homepage=FLAGS.homepage,
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built_using=get_flag_value(FLAGS.built_using),
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priority=FLAGS.priority,
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conflicts=FLAGS.conflicts,
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installed_size=get_flag_value(FLAGS.installed_size)
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)
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create_changes(
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output=FLAGS.changes,
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deb_file=FLAGS.output,
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architecture=FLAGS.architecture,
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short_description=get_flag_value(FLAGS.description).split('\n')[0],
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maintainer=FLAGS.maintainer, package=FLAGS.package,
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version=get_flag_value(FLAGS.version), section=FLAGS.section,
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priority=FLAGS.priority, distribution=FLAGS.distribution,
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urgency=FLAGS.urgency
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)
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if __name__ == '__main__':
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make_gflags()
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FLAGS = gflags.FLAGS
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main(FLAGS(sys.argv))
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