mirror of
https://git.yoctoproject.org/git/opkg-utils
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7a1d428a57
This patch fixes common linter warnings. Signed-off-by: Robert Lehmann <robert.lehmann@sitec-systems.de> Signed-off-by: Alex Stewart <astewart.49c6@gmail.com>
146 lines
4.1 KiB
Python
146 lines
4.1 KiB
Python
# SPDX-License-Identifier: GPL-2.0-only
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"""
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arfile - A module to parse GNU ar archives.
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Copyright (c) 2006-7 Paul Sokolovsky
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This file is released under the terms
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of GNU General Public License v2 or later.
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"""
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from __future__ import absolute_import
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from __future__ import print_function
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import sys
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import os
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import tarfile
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class FileSection(object):
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"A class which allows to treat portion of file as separate file object."
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def __init__(self, f, offset, size):
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self.f = f
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self.offset = offset
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self.size = size
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self.seek(0, 0)
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def seek(self, offset, whence=0):
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if whence == 0:
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return self.f.seek(offset + self.offset, whence)
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elif whence == 1:
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return self.f.seek(offset, whence)
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elif whence == 2:
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return self.f.seek(self.offset + self.size + offset, 0)
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else:
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assert False
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def seekable(self):
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return True
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def tell(self):
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return self.f.tell() - self.offset
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def read(self, size=-1):
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return self.f.read(size)
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class ArFile(object):
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def __init__(self, f, fn):
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self.f = f
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self.directory = {}
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self.directoryRead = False
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signature = self.f.readline()
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assert signature == "!<arch>\n" or signature == b"!<arch>\n", "Old ipk format (non-deb) is unsupported, file: %s, magic: %s, expected %s" % (fn, signature, "!<arch>")
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self.directoryOffset = self.f.tell()
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def open(self, fname):
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if fname in self.directory:
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return FileSection(self.f, self.directory[fname][-1], int(self.directory[fname][5]))
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if self.directoryRead:
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raise IOError("AR member not found: " + fname)
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f = self._scan(fname)
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if f is None:
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raise IOError("AR member not found: " + fname)
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return f
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def _scan(self, fname):
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self.f.seek(self.directoryOffset, 0)
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while True:
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line = self.f.readline()
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if not line:
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self.directoryRead = True
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return None
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if line.decode('ascii') == "\n":
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line = self.f.readline()
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if not line:
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break
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line = line.decode('ascii')
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line = line.replace('`', '')
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# Field lengths from /usr/include/ar.h:
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ar_field_lens = [16, 12, 6, 6, 8, 10, 2]
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descriptor = []
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for field_len in ar_field_lens:
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descriptor.append(line[:field_len].strip())
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line = line[field_len:]
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size = int(descriptor[5])
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# Check for optional / terminator
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if descriptor[0][-1] == "/":
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memberName = descriptor[0][:-1]
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else:
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memberName = descriptor[0]
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self.directory[memberName] = descriptor + [self.f.tell()]
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if memberName == fname:
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# Record directory offset to start from next time
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self.directoryOffset = self.f.tell() + size
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return FileSection(self.f, self.f.tell(), size)
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# Skip data and loop
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if size % 2:
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size = size + 1
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data = self.f.seek(size, 1)
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if __name__ == "__main__":
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if None:
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fn = sys.argv[1]
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f = open(fn, "rb")
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ar = ArFile(f, fn)
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tarStream = ar.open("data.tar.gz")
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print("--------")
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tarStream = ar.open("data.tar.gz")
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print("--------")
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tarStream = ar.open("control.tar.gz")
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print("--------")
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tarStream = ar.open("control.tar.gz2")
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sys.exit(0)
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dir = "."
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if len(sys.argv) > 1:
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dir = sys.argv[1]
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for f in os.listdir(dir):
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if not f.endswith(".opk") and not f.endswith(".ipk"):
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continue
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print("=== %s ===" % f)
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fn = "%s/%s" % (dir, f)
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f = open(fn, "rb")
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ar = ArFile(f, fn)
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tarStream = ar.open("control.tar.gz")
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tarf = tarfile.open("control.tar.gz", "r", tarStream)
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try:
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f2 = tarf.extractfile("control")
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except KeyError:
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f2 = tarf.extractfile("./control")
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print(f2.read())
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