#!/usr/bin/python

# 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.
# seth vidal 2005 (c) etc etc


#Read in the metadata of a series of repositories and check all the
#   dependencies in all packages for resolution. Print out the list of
#   packages with unresolved dependencies


import yum
import yum.Errors
import sys
import os

flagsdict = {'GT':'>', 'LT':'<', 'EQ': '=', 'GE':'>=', 'LE':'<='}


def evrTupletoVer(tuple):
    """convert and evr tuple to a version string, return None if nothing
       to convert"""
    
    e, v,r = tuple
    if v is None:
        return None
    
    val = ''
    if e is not None:
        val = '%s:%s' % (e, v)
    
    if r is not None:
        val = '%s-%s' % (val, r)
    
    return val
    
    

class YumQuiet(yum.YumBase):
    def __init__(self):
        yum.YumBase.__init__(self)
    
    def log(self, value, msg):
        pass

def main(repoids=None):

    my = YumQuiet()
    my.doConfigSetup()
    if os.geteuid() != 0:
        my.conf.setConfigOption('cache', 1)
        print 'Not running as root, might not be able to import all of cache'

    if repoids is not None:
        for repo in my.repos.repos.values():
            if repo.id not in repoids:
                repo.disable()
            else:
                repo.enable()

    my.doRepoSetup()
    print 'Reading in repository metadata - please wait....'
    my.doSackSetup()
    for repo in my.repos.listEnabled():
            
        try:
            my.repos.populateSack(which=[repo.id], with='filelists')
        except yum.Errors.RepoError, e:
            print 'Filelists not available for repo: %s' % repo
            print 'Some dependencies may not be complete for this repository'
            print 'Run as root to get all dependencies'

    unresolved = {}
    
    print 'Checking Dependencies'
    for pkg in my.pkgSack:
        for (req, flags, (reqe, reqv, reqr)) in pkg.returnPrco('requires'):
            if req.startswith('rpmlib'): continue # ignore rpmlib deps
            
            ver = evrTupletoVer((reqe, reqv, reqr))
            try:
                resolve_sack = my.whatProvides(req, flags, ver)
            except yum.Errors.RepoError, e:
                pass
            
            if len(resolve_sack) < 1:
                if not unresolved.has_key(pkg):
                    unresolved[pkg] = []
                unresolved[pkg].append((req, flags, ver))
    

    num = len(my.pkgSack)
    repos = my.pkgSack.pkgsByRepo.keys()
    
    print 'Repos looked at: %s' % len(repos)
    for repo in repos:
        print '   %s' % repo
    print 'Num Packages in Repos: %s' % num
    
    
    pkgs = unresolved.keys()
    pkgs.sort()
    for pkg in pkgs:
        print 'package: %s from %s\n  unresolved deps: ' % (pkg, pkg.repoid)
        for (n, f, v) in unresolved[pkg]:
            req = '%s' % n
            if f: 
                flag = flagsdict[f]
                req = '%s %s'% (req, flag)
            if v:
                req = '%s %s' % (req, v)
            
            print '     %s' % req
    
if __name__ == "__main__":
    if len(sys.argv) < 2:
        repos = None
    else:
        repos = sys.argv[1:]
    
    main(repos)