#!/usr/bin/python2

# Copyright (c) 2003 Intel Corporation
# All rights reserved.
#
# Copyright (c) 2004-2006 The Trustees of Princeton University
# All rights reserved.
# expected /proc/partitions format

import os, sys, string
import popen2
import shutil

from Exceptions import *
import utils
import BootServerRequest
import BootAPI


def Run( vars, log ):
    """
    Download enough files to run rpm and yum from a chroot in
    the system image directory
    
    Expect the following variables from the store:
    SYSIMG_PATH          the path where the system image will be mounted
    PARTITIONS           dictionary of generic part. types (root/swap)
                         and their associated devices.
    SUPPORT_FILE_DIR     directory on the boot servers containing
                         scripts and support files
    NODE_ID              the id of this machine
    
    Sets the following variables:
    TEMP_BOOTCD_PATH     where the boot cd is remounted in the temp
                         path
    ROOT_MOUNTED         set to 1 when the the base logical volumes
                         are mounted.
    """

    log.write( "\n\nStep: Install: Bootstrapping RPM.\n" )

    # make sure we have the variables we need
    try:
        SYSIMG_PATH= vars["SYSIMG_PATH"]
        if SYSIMG_PATH == "":
            raise ValueError, "SYSIMG_PATH"

        PARTITIONS= vars["PARTITIONS"]
        if PARTITIONS == None:
            raise ValueError, "PARTITIONS"

        SUPPORT_FILE_DIR= vars["SUPPORT_FILE_DIR"]
        if SUPPORT_FILE_DIR == None:
            raise ValueError, "SUPPORT_FILE_DIR"

        NODE_ID= vars["NODE_ID"]
        if NODE_ID == "":
            raise ValueError, "NODE_ID"

    except KeyError, var:
        raise BootManagerException, "Missing variable in vars: %s\n" % var
    except ValueError, var:
        raise BootManagerException, "Variable in vars, shouldn't be: %s\n" % var


    try:
        # make sure the required partitions exist
        val= PARTITIONS["root"]
        val= PARTITIONS["swap"]
        val= PARTITIONS["vservers"]
    except KeyError, part:
        log.write( "Missing partition in PARTITIONS: %s\n" % part )
        return 0   

    bs_request= BootServerRequest.BootServerRequest()
    
    log.write( "turning on swap space\n" )
    utils.sysexec( "swapon %s" % PARTITIONS["swap"], log )

    # make sure the sysimg dir is present
    utils.makedirs( SYSIMG_PATH )

    log.write( "mounting root file system\n" )
    utils.sysexec( "mount -t ext3 %s %s" % (PARTITIONS["root"],SYSIMG_PATH), log )

    log.write( "mounting vserver partition in root file system\n" )
    utils.makedirs( SYSIMG_PATH + "/vservers" )
    utils.sysexec( "mount -t ext3 %s %s/vservers" % (PARTITIONS["vservers"],
                                                     SYSIMG_PATH), log )

    vars['ROOT_MOUNTED']= 1

    # check which nodegroups we are part of (>=4.0)
    tarballs = []
    try:
        nodes = BootAPI.call_api_function(vars, "GetNodes", ([NODE_ID], ['nodegroup_ids']))
        node = nodes[0]
        nodegroups = BootAPI.call_api_function(vars, "GetNodeGroups", (node['nodegroup_ids'], ['name']))
        for nodegroup in nodegroups:
            tarballs.append("PlanetLab-Bootstrap-%s.tar.bz2" % nodegroup['name'].lower())
    except:
        pass
    tarballs += ["PlanetLab-Bootstrap.tar.bz2", "alpina-BootstrapRPM.tar.bz2"]

    # download and extract support tarball for
    # this step, which has everything
    # we need to successfully run
    for step_support_file in tarballs:
        source_file= "%s/%s" % (SUPPORT_FILE_DIR,step_support_file)
        dest_file= "%s/%s" % (SYSIMG_PATH, step_support_file)

        # 30 is the connect timeout, 7200 is the max transfer time
        # in seconds (2 hours)
        log.write( "downloading %s\n" % step_support_file )
        result= bs_request.DownloadFile( source_file, None, None,
                                         1, 1, dest_file,
                                         30, 7200)
        if result:
            # New bootstrap tarball contains everything necessary to
            # boot, no need to bootstrap further.
            vars['SKIP_INSTALL_BASE']= (step_support_file == "PlanetLab-Bootstrap.tar.bz2")
            break

    if not result:
        raise BootManagerException, "Unable to download %s from server." % \
              source_file

    log.write( "extracting %s in %s\n" % (dest_file,SYSIMG_PATH) )
    result= utils.sysexec( "tar -C %s -xpjf %s" % (SYSIMG_PATH,dest_file), log )
    utils.removefile( dest_file )

    # copy resolv.conf from the base system into our temp dir
    # so DNS lookups work correctly while we are chrooted
    log.write( "Copying resolv.conf to temp dir\n" )
    utils.sysexec( "cp /etc/resolv.conf %s/etc/" % SYSIMG_PATH, log )

    # Copy the boot server certificate(s) and GPG public key to
    # /usr/boot in the temp dir.
    log.write( "Copying boot server certificates and public key\n" )

    if os.path.exists("/usr/boot"):
        utils.makedirs(SYSIMG_PATH + "/usr")
        shutil.copytree("/usr/boot", SYSIMG_PATH + "/usr/boot")
    elif os.path.exists("/usr/bootme"):
        utils.makedirs(SYSIMG_PATH + "/usr/boot")
        boot_server = file("/usr/bootme/BOOTSERVER").readline().strip()
        shutil.copy("/usr/bootme/cacert/" + boot_server + "/cacert.pem",
                    SYSIMG_PATH + "/usr/boot/cacert.pem")
        file(SYSIMG_PATH + "/usr/boot/boot_server", "w").write(boot_server)
        shutil.copy("/usr/bootme/pubring.gpg", SYSIMG_PATH + "/usr/boot/pubring.gpg")
        
    # For backward compatibility
    if os.path.exists("/usr/bootme"):
        utils.makedirs(SYSIMG_PATH + "/mnt/cdrom")
        shutil.copytree("/usr/bootme", SYSIMG_PATH + "/mnt/cdrom/bootme")

    # Import the GPG key into the RPM database so that RPMS can be verified
    utils.makedirs(SYSIMG_PATH + "/etc/pki/rpm-gpg")
    utils.sysexec("gpg --homedir=/root --export --armor" \
                  " --no-default-keyring --keyring %s/usr/boot/pubring.gpg" \
                  " >%s/etc/pki/rpm-gpg/RPM-GPG-KEY-planetlab" % (SYSIMG_PATH, SYSIMG_PATH))
    utils.sysexec("chroot %s rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-planetlab" % \
                  SYSIMG_PATH)

    return 1