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import os

from Exceptions import *
import utils


def Run( vars, log ):
    """
    Install the base system group of RPMs

    Except the following variables from the store:
    TEMP_PATH             the path to download and store temp files to
    SYSIMG_PATH           the path where the system image will be mounted
                          (always starts with TEMP_PATH)
    INSTALL_LANGS         languages for install (used by rpm)
    CACERT_PATH           where the boot server certificates are
                         
    Sets the following variables:
    None
    
    """

    log.write( "\n\nStep: Install: Installing base OS.\n" )
            
    # make sure we have the variables we need
    try:
        TEMP_PATH= vars["TEMP_PATH"]
        if TEMP_PATH == "":
            raise ValueError, "TEMP_PATH"

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

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

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

        SKIP_INSTALL_BASE= vars["SKIP_INSTALL_BASE"]
        if SKIP_INSTALL_BASE:
            log.write( "Skipping base group install\n" )
            return 1

    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
        

    # this will prevent all the locales from being installed
    log.write( "Setting up RPM configuration in sysimg\n" )
    utils.makedirs( "%s/etc/rpm" % SYSIMG_PATH )
    rpm_macros= file( "%s/etc/rpm/macros" % SYSIMG_PATH, "w" )
    rpm_macros.write( "%%_install_langs %s\n" % INSTALL_LANGS )
    rpm_macros.write( "%_excludedocs 1\n" )
    rpm_macros.write( "%__file_context_path /dev/null\n" )
    rpm_macros.close()
    rpm_macros= None

    log.write( "Running base group install using yum\n" )

    # groupupdate instead of groupinstall since BootstrapRPM
    # already installed a pre-configured RPM
    # database. 'PlanetLab' is now a subset of Fedora Core 2
    # Core/Base plus PlanetLab specific RPMs, so that we don't
    # have to run yum multiple times. The group is called
    # 'PlanetLab' for backward compatibility with NodeUpdate,
    # which is hard-coded to update the 'PlanetLab' group.
    yum_cmd= "chroot %s yum --sslcertdir %s -y groupupdate 'PlanetLab'" % \
             (SYSIMG_PATH, CACERT_PATH)

    utils.sysexec( yum_cmd, log );
    
    return 1