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# Copyright 2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
from __future__ import unicode_literals
import sys
from portage import _encodings, _unicode_encode
from portage.exception import InvalidData
from portage.localization import _
class NeededEntry(object):
"""
Represents one entry (line) from a NEEDED.ELF.2 file. The entry
must have 5 or more semicolon-delimited fields in order to be
considered valid. The sixth field is optional, corresponding
to the multilib category. The multilib_category attribute is
None if the corresponding field is either empty or missing.
"""
__slots__ = ("arch", "filename", "multilib_category", "needed",
"runpaths", "soname")
_MIN_FIELDS = 5
_MULTILIB_CAT_INDEX = 5
@classmethod
def parse(cls, filename, line):
"""
Parse a NEEDED.ELF.2 entry. Raises InvalidData if necessary.
@param filename: file name for use in exception messages
@type filename: str
@param line: a single line of text from a NEEDED.ELF.2 file,
without a trailing newline
@type line: str
@rtype: NeededEntry
@return: A new NeededEntry instance containing data from line
"""
fields = line.split(";")
if len(fields) < cls._MIN_FIELDS:
raise InvalidData(_("Wrong number of fields "
"in %s: %s\n\n") % (filename, line))
obj = cls()
# Extra fields may exist (for future extensions).
if (len(fields) > cls._MULTILIB_CAT_INDEX and
fields[cls._MULTILIB_CAT_INDEX]):
obj.multilib_category = fields[cls._MULTILIB_CAT_INDEX]
else:
obj.multilib_category = None
del fields[cls._MIN_FIELDS:]
obj.arch, obj.filename, obj.soname, rpaths, needed = fields
# We don't use scanelf -q, since that would omit libraries like
# musl's /usr/lib/libc.so which do not have any DT_NEEDED or
# DT_SONAME settings. Since we don't use scanelf -q, we have to
# handle the special rpath value " - " below.
rpaths = "" if rpaths == " - " else rpaths
obj.runpaths = tuple(filter(None, rpaths.split(":")))
obj.needed = tuple(filter(None, needed.split(",")))
return obj
def __str__(self):
"""
Format this entry for writing to a NEEDED.ELF.2 file.
"""
return ";".join([
self.arch,
self.filename,
self.soname,
":".join(self.runpaths),
",".join(self.needed),
(self.multilib_category if self.multilib_category
is not None else "")
]) + "\n"
if sys.hexversion < 0x3000000:
__unicode__ = __str__
def __str__(self):
return _unicode_encode(self.__unicode__(),
encoding=_encodings['content'])
__str__.__doc__ = __unicode__.__doc__
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