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#!/usr/bin/python -tt

# 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 2003 Duke University

import rpm
import types
import gzip
import os
import sys
import locale
import signal

import rpmUtils.transaction

def rpmOutToStr(arg):
    if type(arg) != types.StringType:
    # and arg is not None:
        arg = str(arg)
        
    return arg
    

def compareEVR((e1, v1, r1), (e2, v2, r2)):
    # return 1: a is newer than b
    # 0: a and b are the same version
    # -1: b is newer than a
    if e1 is None:
        e1 = '0'
    else:
        e1 = str(e1)
    v1 = str(v1)
    r1 = str(r1)
    if e2 is None:
        e2 = '0'
    else:
        e2 = str(e2)
    v2 = str(v2)
    r2 = str(r2)
    #print '%s, %s, %s vs %s, %s, %s' % (e1, v1, r1, e2, v2, r2)
    rc = rpm.labelCompare((e1, v1, r1), (e2, v2, r2))
    #print '%s, %s, %s vs %s, %s, %s = %s' % (e1, v1, r1, e2, v2, r2, rc)
    return rc

def compareVerOnly(v1, v2):
    """compare version strings only using rpm vercmp"""
    return compareEVR(('', v1, ''), ('', v2, ''))
    
def checkSig(ts, package, payload=False):
    """Takes a transaction set and a package, check it's sigs.

    By default, only v4 sigs (header-only) will be verified (faster).  By
    setting payload to True, v3 sigs (header+payload) will also be verified
    (slower).

    return 0 if they are all fine
    return 1 if the gpg key can't be found
    return 2 if the header or payload is in someway damaged
    return 3 if the key is not trusted 
    return 4 if the pkg is not gpg or pgp signed"""
    
    value = 0
    currentflags = ts.setVSFlags(0)
    fdno = os.open(package, os.O_RDONLY)
    try:
        hdr = ts.hdrFromFdno(fdno)
    except rpm.error, e:
        if str(e) == "public key not availaiable":
            value = 1
        if str(e) == "public key not available":
            value = 1
        if str(e) == "public key not trusted":
            value = 3
        if str(e) == "error reading package header":
            value = 2
    else:
        error, siginfo = getSigInfo(hdr)
        if error == 101:
            os.close(fdno)
            del hdr
            value = 4
        else:
            del hdr

    # Don't perform the payload check if the header check failed, otherwise we
    # could mask the reason stored in "value" (we only return one integer from
    # this function and shouldn't change that).
    if payload and value == 0:
        os.lseek(fdno, 0, 0)
        # We don't want the OK message to pollute the output but we do want the
        # BAD message (verbose version) in case of a failure, which is only
        # possible by running _verifySigs() twice (temporary hack until we have
        # the proper API for payload verification in RPM).
        rpm.setVerbosity(rpm.RPMLOG_WARNING)
        valid = ts._verifySigs(fdno, package)
        if not valid:
            value = 2
            os.lseek(fdno, 0, 0)
            rpm.setVerbosity(rpm.RPMLOG_INFO)
            ts._verifySigs(fdno, package)
        rpm.setVerbosity(rpm.RPMLOG_NOTICE)

    try:
        os.close(fdno)
    except OSError, e: # if we're not opened, don't scream about it
        pass

    ts.setVSFlags(currentflags) # put things back like they were before
    return value

def getSigInfo(hdr):
    """checks signature from an hdr hand back signature information and/or
       an error code"""
       
    locale.setlocale(locale.LC_ALL, 'C')
    string = '%|DSAHEADER?{%{DSAHEADER:pgpsig}}:{%|RSAHEADER?{%{RSAHEADER:pgpsig}}:{%|SIGGPG?{%{SIGGPG:pgpsig}}:{%|SIGPGP?{%{SIGPGP:pgpsig}}:{(none)}|}|}|}|'
    siginfo = hdr.sprintf(string)
    if siginfo != '(none)':
        error = 0 
        sigtype, sigdate, sigid = siginfo.split(',')
    else:
        error = 101
        sigtype = 'MD5'
        sigdate = 'None'
        sigid = 'None'
        
    infotuple = (sigtype, sigdate, sigid)
    return error, infotuple

def pkgTupleFromHeader(hdr):
    """return a pkgtuple (n, a, e, v, r) from a hdr object, converts
       None epoch to 0, as well."""
   
    name = hdr['name']

    # RPMTAG_SOURCEPACKAGE: RPMTAG_SOURCERPM is not necessarily there for
    # e.g. gpg-pubkeys imported with older rpm versions
    # http://lists.baseurl.org/pipermail/yum/2009-January/022275.html
    if hdr[rpm.RPMTAG_SOURCERPM] or hdr[rpm.RPMTAG_SOURCEPACKAGE] != 1:
        arch = hdr['arch']
    else:
        arch = 'src'
        
    ver = hdr['version']
    rel = hdr['release']
    epoch = hdr['epoch']
    if epoch is None:
        epoch = '0'
    pkgtuple = (name, arch, epoch, ver, rel)
    return pkgtuple
    
    
def rangeCheck(reqtuple, pkgtuple):
    """returns true if the package epoch-ver-rel satisfy the range
       requested in the reqtuple:
       ex: foo >= 2.1-1"""
    # we only ever get here if we have a versioned prco
    # nameonly shouldn't ever raise it
    #(reqn, reqf, (reqe, reqv, reqr)) = reqtuple
    (n, a, e, v, r) = pkgtuple
    return rangeCompare(reqtuple, (n, 'EQ', (e, v, r)))

def rangeCompare(reqtuple, provtuple):
    """returns true if provtuple satisfies reqtuple"""
    (reqn, reqf, (reqe, reqv, reqr)) = reqtuple
    (n, f, (e, v, r)) = provtuple
    if reqn != n:
        return 0

    # unversioned satisfies everything
    if not f or not reqf:
        return 1

    # and you thought we were done having fun
    # if the requested release is left out then we have
    # to remove release from the package prco to make sure the match
    # is a success - ie: if the request is EQ foo 1:3.0.0 and we have 
    # foo 1:3.0.0-15 then we have to drop the 15 so we can match
    if reqr is None:
        r = None
    if reqe is None:
        e = None
    if reqv is None: # just for the record if ver is None then we're going to segfault
        v = None

    # if we just require foo-version, then foo-version-* will match
    if r is None:
        reqr = None

    rc = compareEVR((e, v, r), (reqe, reqv, reqr))

    # does not match unless
    if rc >= 1:
        if reqf in ['GT', 'GE', 4, 12, '>', '>=']:
            return 1
        if reqf in ['EQ', 8, '=']:
            if f in ['LE', 10, 'LT', 2,'<=', '<']:
                return 1
        if reqf in ['LE', 'LT', 'EQ', 10, 2, 8, '<=', '<', '=']:
            if f in ['LE', 'LT', 10, 2, '<=', '<']:
                return 1

    if rc == 0:
        if reqf in ['GT', 4, '>']:
            if f in ['GT', 'GE', 4, 12, '>', '>=']:
                return 1
        if reqf in ['GE', 12, '>=']:
            if f in ['GT', 'GE', 'EQ', 'LE', 4, 12, 8, 10, '>', '>=', '=', '<=']:
                return 1
        if reqf in ['EQ', 8, '=']:
            if f in ['EQ', 'GE', 'LE', 8, 12, 10, '=', '>=', '<=']:
                return 1
        if reqf in ['LE', 10, '<=']:
            if f in ['EQ', 'LE', 'LT', 'GE', 8, 10, 2, 12, '=', '<=', '<' , '>=']:
                return 1
        if reqf in ['LT', 2, '<']:
            if f in ['LE', 'LT', 10, 2, '<=', '<']:
                return 1
    if rc <= -1:
        if reqf in ['GT', 'GE', 'EQ', 4, 12, 8, '>', '>=', '=']:
            if f in ['GT', 'GE', 4, 12, '>', '>=']:
                return 1
        if reqf in ['LE', 'LT', 10, 2, '<=', '<']:
            return 1
#                if rc >= 1:
#                    if reqf in ['GT', 'GE', 4, 12, '>', '>=']:
#                        return 1
#                if rc == 0:
#                    if reqf in ['GE', 'LE', 'EQ', 8, 10, 12, '>=', '<=', '=']:
#                        return 1
#                if rc <= -1:
#                    if reqf in ['LT', 'LE', 2, 10, '<', '<=']:
#                        return 1

    return 0


###########
# Title: Remove duplicates from a sequence
# Submitter: Tim Peters 
# From: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560                      
    
def unique(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 splitFilename(filename):
    """
    Pass in a standard style rpm fullname 
    
    Return a name, version, release, epoch, arch, e.g.::
        foo-1.0-1.i386.rpm returns foo, 1.0, 1, i386
        1:bar-9-123a.ia64.rpm returns bar, 9, 123a, 1, ia64
    """

    if filename[-4:] == '.rpm':
        filename = filename[:-4]
       
    archIndex = filename.rfind('.')
    arch = filename[archIndex+1:]

    relIndex = filename[:archIndex].rfind('-')
    rel = filename[relIndex+1:archIndex]

    verIndex = filename[:relIndex].rfind('-')
    ver = filename[verIndex+1:relIndex]

    epochIndex = filename.find(':')
    if epochIndex == -1:
        epoch = ''
    else:
        epoch = filename[:epochIndex]
        
    name = filename[epochIndex + 1:verIndex]
    return name, ver, rel, epoch, arch


def rpm2cpio(fdno, out=sys.stdout, bufsize=2048):
    """Performs roughly the equivalent of rpm2cpio(8).
       Reads the package from fdno, and dumps the cpio payload to out,
       using bufsize as the buffer size."""
    ts = rpmUtils.transaction.initReadOnlyTransaction()
    hdr = ts.hdrFromFdno(fdno)
    del ts
    
    compr = hdr[rpm.RPMTAG_PAYLOADCOMPRESSOR] or 'gzip'
    #XXX FIXME
    #if compr == 'bzip2':
        # TODO: someone implement me!
    #el
    if compr != 'gzip':
        raise rpmUtils.RpmUtilsError, \
              'Unsupported payload compressor: "%s"' % compr
    f = gzip.GzipFile(None, 'rb', None, os.fdopen(fdno, 'rb', bufsize))
    while 1:
        tmp = f.read(bufsize)
        if tmp == "": break
        out.write(tmp)
    f.close()
                 
def formatRequire (name, version, flags):
    '''
    Return a human readable requirement string (ex.  foobar >= 2.0)
    @param name: requirement name (ex. foobar)
    @param version: requirent version (ex. 2.0)
    @param flags: binary flags ( 0010 = equal, 0100 = greater than, 1000 = less than )
    '''
    s = name
    
    if flags and (type(flags) == type(0) or type(flags) == type(0L)): # Flag must be set and a int (or a long, now)
        if flags & (rpm.RPMSENSE_LESS | rpm.RPMSENSE_GREATER |
                    rpm.RPMSENSE_EQUAL):
            s = s + " "
            if flags & rpm.RPMSENSE_LESS:
                s = s + "<"
            if flags & rpm.RPMSENSE_GREATER:
                s = s + ">"
            if flags & rpm.RPMSENSE_EQUAL:
                s = s + "="
            if version:
                s = "%s %s" %(s, version)
    return s

    
def flagToString(flags):
    flags = flags & 0xf

    if flags == 0: return None
    elif flags == 2: return 'LT'
    elif flags == 4: return 'GT'
    elif flags == 8: return 'EQ'
    elif flags == 10: return 'LE'
    elif flags == 12: return 'GE'

    return flags

def stringToVersion(verstring):
    if verstring in [None, '']:
        return (None, None, None)
    i = verstring.find(':')
    if i != -1:
        try:
            epoch = str(long(verstring[:i]))
        except ValueError:
            # look, garbage in the epoch field, how fun, kill it
            epoch = '0' # this is our fallback, deal
    else:
        epoch = '0'
    j = verstring.find('-')
    if j != -1:
        if verstring[i + 1:j] == '':
            version = None
        else:
            version = verstring[i + 1:j]
        release = verstring[j + 1:]
    else:
        if verstring[i + 1:] == '':
            version = None
        else:
            version = verstring[i + 1:]
        release = None
    return (epoch, version, release)

def hdrFromPackage(ts, package):
    """hand back the rpm header or raise an Error if the pkg is fubar"""
    try:
        fdno = os.open(package, os.O_RDONLY)
    except OSError, e:
        raise rpmUtils.RpmUtilsError, 'Unable to open file'
    
    # XXX: We should start a readonly ts here, so we don't get the options
    # from the other one (sig checking, etc)
    try:
        hdr = ts.hdrFromFdno(fdno)
    except rpm.error, e:
        os.close(fdno)
        raise rpmUtils.RpmUtilsError, "RPM Error opening Package"
    if type(hdr) != rpm.hdr:
        os.close(fdno)
        raise rpmUtils.RpmUtilsError, "RPM Error opening Package (type)"
    
    os.close(fdno)
    return hdr

def checkSignals():
    if hasattr(rpm, "checkSignals") and hasattr(rpm, 'signalsCaught'):
        if rpm.signalsCaught([signal.SIGINT, 
                              signal.SIGTERM,
                              signal.SIGPIPE,
                              signal.SIGQUIT,
                              signal.SIGHUP]):
            sys.exit(1)

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