# This is the bcfg2 support for debian
# $Id $
from glob import glob
from os import environ, stat, system
from popen2 import Popen4
from string import split
from sys import argv

import apt_pkg

from Toolset import Toolset

def Detect():
    try:
        stat('/etc/debian_version')
        return True
    except OSError:
        return False

class Debian(Toolset):
    __important__ = ["/etc/apt/sources.list", "/var/cache/debconf/config.dat", \
                     "/var/cache/debconf/templates.dat"]

    def __init__(self, cfg, setup):
        Toolset.__init__(self, cfg, setup)
        #system("dpkg --configure -a")
        if not self.setup['build']:
            system("dpkg-reconfigure -f noninteractive debconf")
        system("apt-get -q=2 -y update")
        environ["DEBIAN_FRONTEND"]='noninteractive'
        self.Refresh()

    def Refresh(self):
        apt_pkg.init()
        self.cache = apt_pkg.GetCache()
        self.installed = {}
        for pkg in self.cache.Packages:
            if pkg.CurrentVer:
                self.installed[pkg.Name] = pkg.CurrentVer.VerStr

    def VerifyService(self, entry):
        if entry.attrib['status'] == 'off':
            cmd = Popen4("/usr/sbin/update-rc.d -n -f %s remove"%(entry.attrib['name']))
            num = 1
        else:
            cmd = Popen4("/usr/sbin/update-rc.d -n -f %s remove"%(entry.attrib['name']))
            num = 2
        cstat = cmd.poll()
        output = ''
        while cstat == -1:
            output += cmd.fromchild.read()
            cstat = cmd.poll() >> 8
        if len(filter(lambda x:x, split(output, '\n'))) > num:
            return False
        return True

    def InstallService(self, entry):
        if entry.attrib['status'] == 'off':
            if self.setup['dryrun']:
                print "Disabling service %s"%(entry.attrib['name'])
                rc = 1
            else:
                rc = system("update-rc.d -f %s remove"%entry.attrib['name'])
        else:
            if self.setup['dryrun']:
                print "Enabling service %s"%(entry.attrib['name'])
                rc = 1
            else:
                rc = system("update-rc.d %s defaults"%(entry.attrib['name']))
        if rc:
            return False
        return True

    def VerifyPackage(self, entry, modlist=[]):
        if self.installed.has_key(entry.attrib['name']):
            if self.installed[entry.attrib['name']] == entry.attrib['version']:
                if not self.setup['quick']:
                    cmd = Popen4("debsums -s %s"%(entry.attrib['name']))
                    cstat = cmd.poll()
                    output = cmd.fromchild.read()
                    while cstat == -1:
                        output += cmd.fromchild.read()
                        cstat = cmd.poll()
                    output = filter(lambda x:x, split(output, '\n'))
                    if [x for x in output if x not in modlist]:
                        return False
                return True
        return False

    def InstallPackage(self, entry):
        if not entry.attrib.has_key('version'):
            print "Package entry for %s is malformed"%(entry.attrib['name'])
            return False
        
        if self.setup['dryrun'] or self.setup['verbose']:
            print "Installing package %s %s"%(entry.attrib['name'], entry.attrib['version'])

        if self.setup['dryrun']:
            return False
        else:
            # queue package for bulk installation
            self.pkgtodo.append(entry)
            return False

    def Commit(self, entrystate):
        cmd = "apt-get --reinstall -q=2 -y install %s"
        # try single large install
        rc = system(join(map(lambda x:"%s-%s"%(x.attrib['name'], x.attrib['version']), self.pkgtodo)))
        if rc == 0:
            # set installed to true for pkgtodo
            for pkg in self.pkgtodo:
                entrystate[x]=True
            self.pkgtodo = []
        else:
            # do single pass installs
            system("dpkg --configure --pending")
            self.Refresh()
            for pkg in self.pkgtodo:
                if self.VerifyPackage(pkg):
                    entrystate[pkg] = True
                    self.pkgtodo.remove(pkg)
            oldlen = len(self.pkgtodo) + 1
            while (len(self.pkgtodo) < oldlen):
                oldlen = len(self.pkgtodo)
                for pkg in self.pkgtodo:
                    rc = system(cmd%(pkg.attrib['name'], pkg.attrib['user']))
                    if rc == 0:
                        entrystate[pkg] = True
                        self.pkgtodo.remove(pkg)
                    else:
                        print "Failed to install package %s"%(pkg.attrib['name'])

    def GetInstalledConfigs(self):
        # returns a list of installed config files
        ret = []
        for a in map(lambda x:split(open(x).read(),"\n"),glob("/var/lib/dpkg/info/*.conffiles")):
            ret += a
        return ret

    def FindConfigs(self):
        e = []
        for (pkg, vers) in self.installed.iteritems():
            e.append(Element('Package', name=pkg, version=vers))
        # need to add config file two way later
        return e