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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.
"""A simple cross-platform helper to create a debian package."""
import gzip
import hashlib
from io import BytesIO
import os
import os.path
import sys
import tarfile
import textwrap
import time
from third_party.py import gflags
# list of debian fields : (name, mandatory, wrap[, default])
# see http://www.debian.org/doc/debian-policy/ch-controlfields.html
DEBIAN_FIELDS = [
('Package', True, False),
('Version', True, False),
('Section', False, False, 'contrib/devel'),
('Priority', False, False, 'optional'),
('Architecture', False, False, 'all'),
('Depends', False, True, []),
('Recommends', False, True, []),
('Suggests', False, True, []),
('Enhances', False, True, []),
('Conflicts', False, True, []),
('Pre-Depends', False, True, []),
('Installed-Size', False, False),
('Maintainer', True, False),
('Description', True, True),
('Homepage', False, False),
('Built-Using', False, False, 'Bazel'),
('Distribution', False, False, 'unstable'),
('Urgency', False, False, 'medium'),
]
gflags.DEFINE_string('output', None, 'The output file, mandatory')
gflags.MarkFlagAsRequired('output')
gflags.DEFINE_string('changes', None, 'The changes output file, mandatory.')
gflags.MarkFlagAsRequired('changes')
gflags.DEFINE_string('data', None,
'Path to the data tarball, mandatory')
gflags.MarkFlagAsRequired('data')
gflags.DEFINE_string('preinst', None,
'The preinst script (prefix with @ to provide a path).')
gflags.DEFINE_string('postinst', None,
'The postinst script (prefix with @ to provide a path).')
gflags.DEFINE_string('prerm', None,
'The prerm script (prefix with @ to provide a path).')
gflags.DEFINE_string('postrm', None,
'The postrm script (prefix with @ to provide a path).')
# size of chunks for copying package content to final .deb file
# This is a wild guess, but I am not convinced of the value of doing much work
# to tune it.
_COPY_CHUNK_SIZE = 1024 * 32
# see
# https://www.debian.org/doc/manuals/debian-faq/ch-pkg_basics.en.html#s-conffile
gflags.DEFINE_multistring(
'conffile', None,
'List of conffiles (prefix item with @ to provide a path)')
def MakeGflags():
"""Creates a flag for each of the control file fields."""
for field in DEBIAN_FIELDS:
fieldname = field[0].replace('-', '_').lower()
msg = 'The value for the %s content header entry.' % field[0]
if len(field) > 3:
if isinstance(field[3], list):
gflags.DEFINE_multistring(fieldname, field[3], msg)
else:
gflags.DEFINE_string(fieldname, field[3], msg)
else:
gflags.DEFINE_string(fieldname, None, msg)
if field[1]:
gflags.MarkFlagAsRequired(fieldname)
def ConvertToFileLike(content, content_len, converter):
if content_len < 0:
content_len = len(content)
content = converter(content)
return content_len, content
def AddArFileEntry(fileobj, filename,
content='', content_len=-1, timestamp=0,
owner_id=0, group_id=0, mode=0o644):
"""Add a AR file entry to fileobj."""
# If we got the content as a string, turn it into a file like thing.
if isinstance(content, (str, bytes)):
content_len, content = ConvertToFileLike(content, content_len, BytesIO)
inputs = [
(filename + '/').ljust(16), # filename (SysV)
str(timestamp).ljust(12), # timestamp
str(owner_id).ljust(6), # owner id
str(group_id).ljust(6), # group id
str(oct(mode)).replace('0o', '0').ljust(8), # mode
str(content_len).ljust(10), # size
'\x60\x0a', # end of file entry
]
for i in inputs:
fileobj.write(i.encode('ascii'))
size = 0
while True:
data = content.read(_COPY_CHUNK_SIZE)
if not data:
break
size += len(data)
fileobj.write(data)
if size % 2 != 0:
fileobj.write(b'\n') # 2-byte alignment padding
def MakeDebianControlField(name, value, wrap=False):
"""Add a field to a debian control file."""
result = name + ': '
if isinstance(value, str):
value = value.decode('utf-8')
if isinstance(value, list):
value = u', '.join(value)
if wrap:
result += u' '.join(value.split('\n'))
result = textwrap.fill(result,
break_on_hyphens=False,
break_long_words=False)
else:
result += value
return result.replace(u'\n', u'\n ') + u'\n'
def CreateDebControl(extrafiles=None, **kwargs):
"""Create the control.tar.gz file."""
# create the control file
controlfile = ''
for values in DEBIAN_FIELDS:
fieldname = values[0]
key = fieldname[0].lower() + fieldname[1:].replace('-', '')
if values[1] or (key in kwargs and kwargs[key]):
controlfile += MakeDebianControlField(fieldname, kwargs[key], values[2])
# Create the control.tar file
tar = BytesIO()
with gzip.GzipFile('control.tar.gz', mode='w', fileobj=tar, mtime=0) as gz:
with tarfile.open('control.tar.gz', mode='w', fileobj=gz) as f:
tarinfo = tarfile.TarInfo('control')
# Don't discard unicode characters when computing the size
tarinfo.size = len(controlfile.encode('utf-8'))
f.addfile(tarinfo, fileobj=BytesIO(controlfile.encode('utf-8')))
if extrafiles:
for name, (data, mode) in extrafiles.items():
tarinfo = tarfile.TarInfo(name)
tarinfo.size = len(data)
tarinfo.mode = mode
f.addfile(tarinfo, fileobj=BytesIO(data.encode('utf-8')))
control = tar.getvalue()
tar.close()
return control
def CreateDeb(output,
data,
preinst=None,
postinst=None,
prerm=None,
postrm=None,
conffiles=None,
**kwargs):
"""Create a full debian package."""
extrafiles = {}
if preinst:
extrafiles['preinst'] = (preinst, 0o755)
if postinst:
extrafiles['postinst'] = (postinst, 0o755)
if prerm:
extrafiles['prerm'] = (prerm, 0o755)
if postrm:
extrafiles['postrm'] = (postrm, 0o755)
if conffiles:
extrafiles['conffiles'] = ('\n'.join(conffiles) + '\n', 0o644)
control = CreateDebControl(extrafiles=extrafiles, **kwargs)
# Write the final AR archive (the deb package)
with open(output, 'wb') as f:
f.write(b'!<arch>\n') # Magic AR header
AddArFileEntry(f, 'debian-binary', b'2.0\n')
AddArFileEntry(f, 'control.tar.gz', control)
# Tries to preserve the extension name
ext = os.path.basename(data).split('.')[-2:]
if len(ext) < 2:
ext = 'tar'
elif ext[1] == 'tgz':
ext = 'tar.gz'
elif ext[1] == 'tar.bzip2':
ext = 'tar.bz2'
else:
ext = '.'.join(ext)
if ext not in ['tar.bz2', 'tar.gz', 'tar.xz', 'tar.lzma']:
ext = 'tar'
data_size = os.stat(data).st_size
with open(data, 'rb') as datafile:
AddArFileEntry(f, 'data.' + ext, datafile, content_len=data_size)
def GetChecksumsFromFile(filename, hash_fns=None):
"""Computes MD5 and/or other checksums of a file.
Args:
filename: Name of the file.
hash_fns: Mapping of hash functions.
Default is {'md5': hashlib.md5}
Returns:
Mapping of hash names to hexdigest strings.
{ <hashname>: <hexdigest>, ... }
"""
hash_fns = hash_fns or {'md5': hashlib.md5}
checksums = {k: fn() for (k, fn) in hash_fns.items()}
with open(filename, 'rb') as file_handle:
while True:
buf = file_handle.read(1048576) # 1 MiB
if not buf:
break
for hashfn in checksums.values():
hashfn.update(buf)
return {k: fn.hexdigest() for (k, fn) in checksums.items()}
def CreateChanges(output,
deb_file,
architecture,
short_description,
maintainer,
package,
version,
section,
priority,
distribution,
urgency,
timestamp=0):
"""Create the changes file."""
checksums = GetChecksumsFromFile(deb_file, {'md5': hashlib.md5,
'sha1': hashlib.sha1,
'sha256': hashlib.sha256})
debsize = str(os.path.getsize(deb_file))
deb_basename = os.path.basename(deb_file)
changesdata = ''.join([
MakeDebianControlField('Format', '1.8'),
MakeDebianControlField('Date', time.ctime(timestamp)),
MakeDebianControlField('Source', package),
MakeDebianControlField('Binary', package),
MakeDebianControlField('Architecture', architecture),
MakeDebianControlField('Version', version),
MakeDebianControlField('Distribution', distribution),
MakeDebianControlField('Urgency', urgency),
MakeDebianControlField('Maintainer', maintainer),
MakeDebianControlField('Changed-By', maintainer),
MakeDebianControlField('Description',
'\n%s - %s' % (package, short_description)),
MakeDebianControlField('Changes',
('\n%s (%s) %s; urgency=%s'
'\nChanges are tracked in revision control.') %
(package, version, distribution, urgency)),
MakeDebianControlField(
'Files', '\n' + ' '.join(
[checksums['md5'], debsize, section, priority, deb_basename])),
MakeDebianControlField(
'Checksums-Sha1',
'\n' + ' '.join([checksums['sha1'], debsize, deb_basename])),
MakeDebianControlField(
'Checksums-Sha256',
'\n' + ' '.join([checksums['sha256'], debsize, deb_basename]))
])
with open(output, 'w') as changes_fh:
changes_fh.write(changesdata.encode('utf-8'))
def GetFlagValue(flagvalue, strip=True):
if flagvalue:
flagvalue = flagvalue.decode('utf-8')
if flagvalue[0] == '@':
with open(flagvalue[1:], 'r') as f:
flagvalue = f.read().decode('utf-8')
if strip:
return flagvalue.strip()
return flagvalue
def GetFlagValues(flagvalues):
if flagvalues:
return [GetFlagValue(f, False) for f in flagvalues]
else:
return None
def main(unused_argv):
CreateDeb(
FLAGS.output,
FLAGS.data,
preinst=GetFlagValue(FLAGS.preinst, False),
postinst=GetFlagValue(FLAGS.postinst, False),
prerm=GetFlagValue(FLAGS.prerm, False),
postrm=GetFlagValue(FLAGS.postrm, False),
conffiles=GetFlagValues(FLAGS.conffile),
package=FLAGS.package,
version=GetFlagValue(FLAGS.version),
description=GetFlagValue(FLAGS.description),
maintainer=FLAGS.maintainer,
section=FLAGS.section,
architecture=FLAGS.architecture,
depends=FLAGS.depends,
suggests=FLAGS.suggests,
enhances=FLAGS.enhances,
preDepends=FLAGS.pre_depends,
recommends=FLAGS.recommends,
homepage=FLAGS.homepage,
builtUsing=GetFlagValue(FLAGS.built_using),
priority=FLAGS.priority,
conflicts=FLAGS.conflicts,
installedSize=GetFlagValue(FLAGS.installed_size))
CreateChanges(
output=FLAGS.changes,
deb_file=FLAGS.output,
architecture=FLAGS.architecture,
short_description=GetFlagValue(FLAGS.description).split('\n')[0],
maintainer=FLAGS.maintainer, package=FLAGS.package,
version=GetFlagValue(FLAGS.version), section=FLAGS.section,
priority=FLAGS.priority, distribution=FLAGS.distribution,
urgency=FLAGS.urgency)
if __name__ == '__main__':
MakeGflags()
FLAGS = gflags.FLAGS
main(FLAGS(sys.argv))