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# base classes and functions for dumping out package Metadata
#
# This program 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.
#
# This program 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 Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
# Copyright 2004 Duke University
# $Id: dumpMetadata.py,v 1.36 2006/02/21 20:10:08 pnasrat Exp $
import os
import rpm
import exceptions
import md5
import sha
import types
import struct
import re
import stat
# done to fix gzip randomly changing the checksum
import gzip
from zlib import error as zlibError
from gzip import write32u, FNAME
__all__ = ["GzipFile","open"]
class GzipFile(gzip.GzipFile):
def _write_gzip_header(self):
self.fileobj.write('\037\213') # magic header
self.fileobj.write('\010') # compression method
fname = self.filename[:-3]
flags = 0
if fname:
flags = FNAME
self.fileobj.write(chr(flags))
write32u(self.fileobj, long(0))
self.fileobj.write('\002')
self.fileobj.write('\377')
if fname:
self.fileobj.write(fname + '\000')
def _gzipOpen(filename, mode="rb", compresslevel=9):
return GzipFile(filename, mode, compresslevel)
def returnFD(filename):
try:
fdno = os.open(filename, os.O_RDONLY)
except OSError:
raise MDError, "Error opening file"
return fdno
def returnHdr(ts, package):
"""hand back the rpm header or raise an Error if the pkg is fubar"""
opened_here = 0
try:
if type(package) is types.StringType:
opened_here = 1
fdno = os.open(package, os.O_RDONLY)
else:
fdno = package # let's assume this is an fdno and go with it :)
except OSError:
raise MDError, "Error opening file"
ts.setVSFlags((rpm._RPMVSF_NOSIGNATURES|rpm.RPMVSF_NOMD5|rpm.RPMVSF_NEEDPAYLOAD))
try:
hdr = ts.hdrFromFdno(fdno)
except rpm.error:
raise MDError, "Error opening package"
if type(hdr) != rpm.hdr:
raise MDError, "Error opening package"
ts.setVSFlags(0)
if opened_here:
os.close(fdno)
del fdno
return hdr
def getChecksum(sumtype, file, CHUNK=2**16):
"""takes filename, hand back Checksum of it
sumtype = md5 or sha
filename = /path/to/file
CHUNK=65536 by default"""
# chunking brazenly lifted from Ryan Tomayko
opened_here = 0
try:
if type(file) is not types.StringType:
fo = file # assume it's a file-like-object
else:
opened_here = 1
fo = open(file, 'rb', CHUNK)
if sumtype == 'md5':
sum = md5.new()
elif sumtype == 'sha':
sum = sha.new()
else:
raise MDError, 'Error Checksumming file, wrong checksum type %s' % sumtype
chunk = fo.read
while chunk:
chunk = fo.read(CHUNK)
sum.update(chunk)
if opened_here:
fo.close()
del fo
return sum.hexdigest()
except:
raise MDError, 'Error opening file for checksum: %s' % file
def utf8String(string):
"""hands back a unicoded string"""
if string is None:
return ''
elif isinstance(string, unicode):
return string
try:
x = unicode(string, 'ascii')
return string
except UnicodeError:
encodings = ['utf-8', 'iso-8859-1', 'iso-8859-15', 'iso-8859-2']
for enc in encodings:
try:
x = unicode(string, enc)
except UnicodeError:
pass
else:
if x.encode(enc) == string:
return x.encode('utf-8')
newstring = ''
for char in string:
if ord(char) > 127:
newstring = newstring + '?'
else:
newstring = newstring + char
return newstring
def byteranges(file):
"""takes an rpm file or fileobject and returns byteranges for location of the header"""
opened_here = 0
if type(file) is not types.StringType:
fo = file
else:
opened_here = 1
fo = open(file, 'r')
#read in past lead and first 8 bytes of sig header
fo.seek(104)
# 104 bytes in
binindex = fo.read(4)
# 108 bytes in
(sigindex, ) = struct.unpack('>I', binindex)
bindata = fo.read(4)
# 112 bytes in
(sigdata, ) = struct.unpack('>I', bindata)
# each index is 4 32bit segments - so each is 16 bytes
sigindexsize = sigindex * 16
sigsize = sigdata + sigindexsize
# we have to round off to the next 8 byte boundary
disttoboundary = (sigsize % 8)
if disttoboundary != 0:
disttoboundary = 8 - disttoboundary
# 112 bytes - 96 == lead, 8 = magic and reserved, 8 == sig header data
hdrstart = 112 + sigsize + disttoboundary
fo.seek(hdrstart) # go to the start of the header
fo.seek(8,1) # read past the magic number and reserved bytes
binindex = fo.read(4)
(hdrindex, ) = struct.unpack('>I', binindex)
bindata = fo.read(4)
(hdrdata, ) = struct.unpack('>I', bindata)
# each index is 4 32bit segments - so each is 16 bytes
hdrindexsize = hdrindex * 16
# add 16 to the hdrsize to account for the 16 bytes of misc data b/t the
# end of the sig and the header.
hdrsize = hdrdata + hdrindexsize + 16
# header end is hdrstart + hdrsize
hdrend = hdrstart + hdrsize
if opened_here:
fo.close()
del fo
return (hdrstart, hdrend)
class MDError(exceptions.Exception):
def __init__(self, args=None):
exceptions.Exception.__init__(self)
self.args = args
class RpmMetaData:
"""each drpm is one object, you pass it an rpm file
it opens the file, and pulls the information out in bite-sized chunks :)
"""
mode_cache = {}
def __init__(self, ts, basedir, filename, options, is_drpm):
try:
stats = os.stat(os.path.join(basedir, filename))
self.size = stats[6]
self.mtime = stats[8]
del stats
except OSError, e:
raise MDError, "Error Stat'ing file %s %s" % (basedir, filename)
self.options = options
self.localurl = options['baseurl']
self.relativepath = filename
fd = returnFD(os.path.join(basedir, filename))
self.hdr = returnHdr(ts, fd)
os.lseek(fd, 0, 0)
fo = os.fdopen(fd, 'rb')
self.pkgid = self.doChecksumCache(fo)
fo.seek(0)
(self.rangestart, self.rangeend) = byteranges(fo)
self.is_drpm = False
if is_drpm:
fo.seek(self.rangeend)
self._getOldInfo(fo)
self.is_drpm = True
del fo
del fd
def arch(self):
if self.tagByName('sourcepackage') == 1:
return 'src'
else:
return self.tagByName('arch')
def _stringToNEVR(self, string):
i = string.rfind("-", 0, string.rfind("-")-1)
name = string[:i]
(epoch, ver, rel) = self._stringToVersion(string[i+1:])
return (name, epoch, ver, rel)
def _getLength(self, in_data):
length = 0
for val in in_data:
length = length * 256
length += ord(val)
return length
def _getOldInfo(self, fo):
try:
compobj = gzip.GzipFile("", "rb", 9, fo)
except:
raise zlibError("Data not stored in gzip format")
if compobj.read(4)[:3] != "DLT":
raise Exception("Not a deltarpm")
nevr_length = self._getLength(compobj.read(4))
nevr = compobj.read(nevr_length).strip("\x00")
seq_length = self._getLength(compobj.read(4))
seq = compobj.read(seq_length)
hex_seq = ""
for char in seq:
hex_seq += str("%02x" % ord(char))
self.oldnevrstring = nevr
self.oldnevr = self._stringToNEVR(nevr)
self.sequence = hex_seq
compobj.close()
def _stringToVersion(self, strng):
i = strng.find(':')
if i != -1:
epoch = strng[:i]
else:
epoch = '0'
j = strng.find('-')
if j != -1:
if strng[i + 1:j] == '':
version = None
else:
version = strng[i + 1:j]
release = strng[j + 1:]
else:
if strng[i + 1:] == '':
version = None
else:
version = strng[i + 1:]
release = None
return (epoch, version, release)
###########
# Title: Remove duplicates from a sequence
# Submitter: Tim Peters
# From: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560
def _uniq(self,s):
"""Return a list of the elements in s, but without duplicates.
For example, unique([1,2,3,1,2,3]) is some permutation of [1,2,3],
unique("abcabc") some permutation of ["a", "b", "c"], and
unique(([1, 2], [2, 3], [1, 2])) some permutation of
[[2, 3], [1, 2]].
For best speed, all sequence elements should be hashable. Then
unique() will usually work in linear time.
If not possible, the sequence elements should enjoy a total
ordering, and if list(s).sort() doesn't raise TypeError it's
assumed that they do enjoy a total ordering. Then unique() will
usually work in O(N*log2(N)) time.
If that's not possible either, the sequence elements must support
equality-testing. Then unique() will usually work in quadratic
time.
"""
n = len(s)
if n == 0:
return []
# Try using a dict first, as that's the fastest and will usually
# work. If it doesn't work, it will usually fail quickly, so it
# usually doesn't cost much to *try* it. It requires that all the
# sequence elements be hashable, and support equality comparison.
u = {}
try:
for x in s:
u[x] = 1
except TypeError:
del u # move on to the next method
else:
return u.keys()
# We can't hash all the elements. Second fastest is to sort,
# which brings the equal elements together; then duplicates are
# easy to weed out in a single pass.
# NOTE: Python's list.sort() was designed to be efficient in the
# presence of many duplicate elements. This isn't true of all
# sort functions in all languages or libraries, so this approach
# is more effective in Python than it may be elsewhere.
try:
t = list(s)
t.sort()
except TypeError:
del t # move on to the next method
else:
assert n > 0
last = t[0]
lasti = i = 1
while i < n:
if t[i] != last:
t[lasti] = last = t[i]
lasti += 1
i += 1
return t[:lasti]
# Brute force is all that's left.
u = []
for x in s:
if x not in u:
u.append(x)
return u
def tagByName(self, tag):
data = self.hdr[tag]
if type(data) is types.ListType:
if len(data) > 0:
return data[0]
else:
return ''
else:
return data
def listTagByName(self, tag):
"""take a tag that should be a list and make sure it is one"""
lst = []
data = self.hdr[tag]
if data is None:
return lst
if type(data) is types.ListType:
lst.extend(data)
else:
lst.append(data)
return lst
def epoch(self):
if self.hdr['epoch'] is None:
return 0
else:
return self.tagByName('epoch')
def doChecksumCache(self, fo):
"""return a checksum for a package:
- check if the checksum cache is enabled
if not - return the checksum
if so - check to see if it has a cache file
if so, open it and return the first line's contents
if not, grab the checksum and write it to a file for this pkg
"""
if not self.options['cache']:
return getChecksum(self.options['sumtype'], fo)
csumtag = os.path.basename(self.relativepath) + ".cache"
csumfile = '%s/%s' % (self.options['cachedir'], csumtag)
if os.path.exists(csumfile) and self.mtime <= os.stat(csumfile)[8]:
csumo = open(csumfile, 'r')
checksum = csumo.readline()
csumo.close()
else:
checksum = getChecksum(self.options['sumtype'], fo)
csumo = open(csumfile, 'w')
csumo.write(checksum)
csumo.close()
return checksum
def generateXML(doc, node, formatns, drpmObj, sumtype, pkgDeltas):
"""takes an xml doc object and a package metadata entry node, populates a
package node with the md information"""
name = drpmObj.tagByName('name')
arch = drpmObj.arch()
epoch = str(drpmObj.epoch())
ver = str(drpmObj.tagByName('version'))
rel = str(drpmObj.tagByName('release'))
if not pkgDeltas.has_key('%s-%s:%s-%s.%s' % (name, epoch, ver, rel, arch)):
pkgNode = node.newChild(None, "package", None)
pkgNode.newProp('type', 'rpm')
pkgNode.newChild(None, 'name', name)
pkgNode.newChild(None, 'arch', arch)
version = pkgNode.newChild(None, 'version', None)
version.newProp('epoch', epoch)
version.newProp('ver', ver)
version.newProp('rel', rel)
deltas = pkgNode.newChild(None, 'deltas', None)
pkgDeltas['%s-%s:%s-%s.%s' % (name, epoch, ver, rel, arch)] = deltas
else:
deltas = pkgDeltas['%s-%s:%s-%s.%s' % (name, epoch, ver, rel, arch)]
(oldname, oldepoch, oldver, oldrel) = drpmObj.oldnevr
drpmNode = deltas.newChild(None, "oldrpm", None)
if name != oldname:
drpmNode.newChild(None, 'name', oldname)
# oldrpm arch is not stored in drpm, so we can only work within same arch
version = drpmNode.newChild(None, 'version', None)
if epoch != oldepoch:
version.newProp('epoch', oldepoch)
if ver != oldver:
version.newProp('ver', oldver)
version.newProp('rel', oldrel)
drpmNode.newChild(None, 'drpm_filename', drpmObj.relativepath)
drpmNode.newChild(None, 'size', str(drpmObj.size))
drpmNode.newChild(None, 'sequence', '%s-%s' % (drpmObj.oldnevrstring, drpmObj.sequence))
checksum = drpmNode.newChild(None, 'checksum', drpmObj.pkgid)
checksum.newProp('type', drpmObj.options['sumtype'])
def repoXML(node, cmds):
"""generate the repomd.xml file that stores the info on the other files"""
sumtype = cmds['sumtype']
workfiles = [(cmds['prestofile'], 'deltas')]
for (file, ftype) in workfiles:
zfo = _gzipOpen(os.path.join(cmds['outputdir'], cmds['tempdir'], file))
uncsum = getChecksum(sumtype, zfo)
zfo.close()
csum = getChecksum(sumtype, os.path.join(cmds['outputdir'], cmds['tempdir'], file))
timestamp = os.stat(os.path.join(cmds['outputdir'], cmds['tempdir'], file))[8]
data = node.newChild(None, 'data', None)
data.newProp('type', ftype)
location = data.newChild(None, 'location', None)
if cmds['baseurl'] is not None:
location.newProp('xml:base', cmds['baseurl'])
location.newProp('href', os.path.join(cmds['finaldir'], file))
checksum = data.newChild(None, 'checksum', csum)
checksum.newProp('type', sumtype)
timestamp = data.newChild(None, 'timestamp', str(timestamp))
unchecksum = data.newChild(None, 'open-checksum', uncsum)
unchecksum.newProp('type', sumtype)
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