#!/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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# copyright 2006 Duke University
# author seth vidal

# sync all or the newest packages from a repo to the local path
# TODO:
#     have it print out list of changes
#     make it work with mirrorlists (silly, really)
#     man page/more useful docs
#     deal nicely with a package changing but not changing names (ie: replacement)

# criteria
# if a package is not the same and smaller then reget it
# if a package is not the same and larger, delete it and get it again
# always replace metadata files if they're not the same.





import os
import sys
import shutil
import stat

from optparse import OptionParser
from urlparse import urljoin

import yum
import yum.Errors
from yum.misc import getCacheDir
from yum.constants import *
from yum.packageSack import ListPackageSack
import rpmUtils.arch
import logging
from urlgrabber.progress import TextMeter
import urlgrabber

# for yum 2.4.X compat
def sortPkgObj(pkg1 ,pkg2):
    """sorts a list of yum package objects by name"""
    if pkg1.name > pkg2.name:
        return 1
    elif pkg1.name == pkg2.name:
        return 0
    else:
        return -1
        
class RepoSync(yum.YumBase):
    def __init__(self, opts):
        yum.YumBase.__init__(self)
        self.logger = logging.getLogger('yum.verbose.reposync')
        self.opts = opts

def localpkgs(directory):
    names = os.listdir(directory)

    cache = {}
    for name in names:
        fn = os.path.join(directory, name)
        try:
            st = os.lstat(fn)
        except os.error:
            continue
        if stat.S_ISDIR(st.st_mode):
            subcache = localpkgs(fn)
            for pkg in subcache.keys():
                cache[pkg] = subcache[pkg]
        elif stat.S_ISREG(st.st_mode) and name.endswith(".rpm"):
            cache[name] = { 'path': fn, 'size': st.st_size, 'device': st.st_dev }
    return cache

def parseArgs():
    usage = """
    Reposync is used to synchronize a remote yum repository to a local 
    directory using yum to retrieve the packages.
    
    %s [options]
    """ % sys.argv[0]

    parser = OptionParser(usage=usage)
    parser.add_option("-c", "--config", default='/etc/yum.conf',
        help='config file to use (defaults to /etc/yum.conf)')
    parser.add_option("-a", "--arch", default=None,
        help='act as if running the specified arch (default: current arch, note: does not override $releasever. x86_64 is a superset for i*86.)')
    parser.add_option("--source", default=False, dest="source", action="store_true",
                      help='operate on source packages')
    parser.add_option("-r", "--repoid", default=[], action='append',
        help="specify repo ids to query, can be specified multiple times (default is all enabled)")
    parser.add_option("-e", "--cachedir",
        help="directory in which to store metadata")
    parser.add_option("-t", "--tempcache", default=False, action="store_true", 
        help="Use a temp dir for storing/accessing yum-cache")
    parser.add_option("-d", "--delete", default=False, action="store_true",
        help="delete local packages no longer present in repository")
    parser.add_option("-p", "--download_path", dest='destdir', 
        default=os.getcwd(), help="Path to download packages to: defaults to current dir")
    parser.add_option("--norepopath", dest='norepopath', default=False, action="store_true",
        help="Don't add the reponame to the download path. Can only be used when syncing a single repository (default is to add the reponame)")
    parser.add_option("-g", "--gpgcheck", default=False, action="store_true",
        help="Remove packages that fail GPG signature checking after downloading")
    parser.add_option("-u", "--urls", default=False, action="store_true", 
        help="Just list urls of what would be downloaded, don't download")
    parser.add_option("-n", "--newest-only", dest='newest', default=False, action="store_true", 
        help="Download only newest packages per-repo")
    parser.add_option("-q", "--quiet", default=False, action="store_true", 
        help="Output as little as possible")
    parser.add_option("-l", "--plugins", default=False, action="store_true", 
        help="enable yum plugin support")
    parser.add_option("-m", "--downloadcomps", default=False, action="store_true",
        help="also download comps.xml")
    parser.add_option("","--download-metadata", dest="downloadmd", 
        default=False, action="store_true", 
        help="download all the non-default metadata")
    (opts, args) = parser.parse_args()
    return (opts, args)


def main():
    (opts, junk) = parseArgs()
    
    if not os.path.exists(opts.destdir) and not opts.urls:
        try:
            os.makedirs(opts.destdir)
        except OSError, e:
            print >> sys.stderr, "Error: Cannot create destination dir %s" % opts.destdir
            sys.exit(1)
    
    if not os.access(opts.destdir, os.W_OK) and not opts.urls:
        print >> sys.stderr, "Error: Cannot write to  destination dir %s" % opts.destdir
        sys.exit(1)
        
    my = RepoSync(opts=opts)
    my.doConfigSetup(fn=opts.config, init_plugins=opts.plugins)

    # Force unprivileged users to have a private temporary cachedir
    # if they've not given an explicit cachedir
    if os.getuid() != 0 and not opts.cachedir:
        opts.tempcache = True

    if opts.tempcache:
        cachedir = getCacheDir()
        if cachedir is None:
            print >> sys.stderr, "Error: Could not make cachedir, exiting"
            sys.exit(50)
            
        my.repos.setCacheDir(cachedir)
    elif opts.cachedir:
        my.repos.setCacheDir(opts.cachedir)

    #  Use progress bar display when downloading repo metadata
    # and package files ... needs to be setup before .repos (ie. RHN/etc.).
    if not opts.quiet:
        my.repos.setProgressBar(TextMeter(fo=sys.stdout))
    my.doRepoSetup()

    if len(opts.repoid) > 0:
        myrepos = []
        
        # find the ones we want
        for glob in opts.repoid:
            myrepos.extend(my.repos.findRepos(glob))
        
        # disable them all
        for repo in my.repos.repos.values():
            repo.disable()
        
        # enable the ones we like
        for repo in myrepos:
            repo.enable()

    # --norepopath can only be sensibly used with a single repository:
    if len(my.repos.listEnabled()) > 1 and opts.norepopath:
        print >> sys.stderr, "Error: Can't use --norepopath with multiple repositories"
        sys.exit(1)

    try:
        arches = rpmUtils.arch.getArchList(opts.arch)
        if opts.source:
            arches +=  ['src']
        my.doSackSetup(arches)
    except yum.Errors.RepoError, e:
        print >> sys.stderr, "Error setting up repositories: %s" % e
        # maybe this shouldn't be entirely fatal
        sys.exit(1)
    
    for repo in my.repos.listEnabled():
        reposack = ListPackageSack(my.pkgSack.returnPackages(repoid=repo.id))

        if opts.newest:
            download_list = reposack.returnNewestByNameArch()
        else:
            download_list = list(reposack)
        
        if opts.norepopath:
            local_repo_path = opts.destdir
        else:
            local_repo_path = opts.destdir + '/' + repo.id

        if opts.delete and os.path.exists(local_repo_path):
            current_pkgs = localpkgs(local_repo_path)

            download_set = {}
            for pkg in download_list:
                remote = pkg.returnSimple('relativepath')
                rpmname = os.path.basename(remote)
                download_set[rpmname] = 1

            for pkg in current_pkgs:
                if pkg in download_set:
                    continue

                if not opts.quiet:
                    my.logger.info("Removing obsolete %s", pkg)
                os.unlink(current_pkgs[pkg]['path'])

        if opts.downloadcomps or opts.downloadmd:

            if not os.path.exists(local_repo_path):
                try:
                    os.makedirs(local_repo_path)
                except IOError, e:
                    my.logger.error("Could not make repo subdir: %s" % e)
                    my.closeRpmDB()
                    sys.exit(1)

            if opts.downloadcomps:
                wanted_types = ['group']
            
            if opts.downloadmd:
                wanted_types = repo.repoXML.fileTypes()

            for ftype in repo.repoXML.fileTypes():
                if ftype in ['primary', 'primary_db', 'filelists',
                             'filelists_db', 'other', 'other_db']:
                    continue
                if ftype not in wanted_types:
                    continue

                try:
                    resultfile = repo.retrieveMD(ftype)
                    basename  = os.path.basename(resultfile)
                    if ftype == 'group' and opts.downloadcomps: # for compat with how --downloadcomps saved the comps file always as comps.xml
                        basename = 'comps.xml'
                    shutil.copyfile(resultfile, "%s/%s" % (local_repo_path, basename))
                except yum.Errors.RepoMDError,e :
                    if not opts.quiet:
                        my.logger.error("Unable to fetch metadata: %s" % e)
                
        remote_size = 0
        local_size  = 0
        if not opts.urls:
            for pkg in download_list:
                remote = pkg.returnSimple('relativepath')
                local = local_repo_path + '/' + remote
                sz = int(pkg.returnSimple('packagesize'))
                if os.path.exists(local) and os.path.getsize(local) == sz:
                    continue
                remote_size += sz

        if hasattr(urlgrabber.progress, 'text_meter_total_size'):
            urlgrabber.progress.text_meter_total_size(remote_size)

        download_list.sort(sortPkgObj)
        n = 0
        exit_code = 0
        for pkg in download_list:
            n = n + 1
            repo = my.repos.getRepo(pkg.repoid)
            remote = pkg.returnSimple('relativepath')
            local = local_repo_path + '/' + remote
            localdir = os.path.dirname(local)
            if not os.path.exists(localdir):
                os.makedirs(localdir)

            sz = int(pkg.returnSimple('packagesize'))
            if os.path.exists(local) and os.path.getsize(local) == sz:
                
                if not opts.quiet:
                    my.logger.error("[%s: %-5d of %-5d ] Skipping existing %s" % (repo.id, n, len(download_list), remote))
                continue
    
            if opts.urls:
                baseurl = None
                if repo.urls[0][-1] != '/':
                    baseurl = repo.urls[0] + '/'
                else:
                    baseurl = repo.urls[0]
                    url = urljoin(baseurl,remote)
                    print '%s' % url
                continue
    
            # make sure the repo subdir is here before we go on.
            if not os.path.exists(local_repo_path):
                try:
                    os.makedirs(local_repo_path)
                except IOError, e:
                    my.logger.error("Could not make repo subdir: %s" % e)
                    my.closeRpmDB()
                    sys.exit(1)
            
            # Disable cache otherwise things won't download            
            repo.cache = 0
            if not opts.quiet:
                my.logger.info( '[%s: %-5d of %-5d ] Downloading %s' % (repo.id, n, len(download_list), remote))
            pkg.localpath = local # Hack: to set the localpath we want.
            try:
                path = repo.getPackage(pkg)
            except yum.Errors.RepoError, e:
                my.logger.error("Could not retrieve package %s. Error was %s" % (pkg, str(e)))
                local_size += sz
                exit_code = 1
                continue

            local_size += sz
            if hasattr(urlgrabber.progress, 'text_meter_total_size'):
                urlgrabber.progress.text_meter_total_size(remote_size, local_size)
            if opts.gpgcheck:
                result, error = my.sigCheckPkg(pkg)
                if result != 0:
                    if result == 1:
                        my.logger.warning('Removing %s, due to missing GPG key.' % os.path.basename(remote))
                    elif result == 2:
                        my.logger.warning('Removing %s due to failed signature check.' % os.path.basename(remote))
                    else:
                        my.logger.warning('Removing %s due to failed signature check: %s' % (os.path.basename(remote), error))
                    os.unlink(path)
                    exit_code = 1
                    continue

            if not os.path.exists(local) or not os.path.samefile(path, local):
                shutil.copy2(path, local)

    my.closeRpmDB()
    sys.exit(exit_code)

if __name__ == "__main__":
    main()
    
