libs/kernel.lunar

#!/bin/bash
############################################################
#                                                          #
# kernel.lunar functions for managing kernel installation  #
# and bootloaders                                          #
#                                                          #
############################################################
#                                                          #
# Parts Copyright Terry Chan 2002 GPLv2                    #
# Parts Copyright Niki Guldbrand 2003 GPLv2                #
# Parts Copyright FW Systems llc 2003 GPLv2                #
# Parts Copyright Auke Kok 2005 GPLv2                      #
# Parts Copyright Stefan Wold 2010 GPLv2                   #
#                                                          #
############################################################


# Description : This function makes backups of the kernels and modules
# Arg 1       : Filename of the kernel to backup (With or without full path)
#               With the format $VERSION_$EXTRAVERSION
backup_mods_krnl() {
  local ARCH=$(arch)
  debug_msg "backup_mods_krnl ($@)"

  devoke_installwatch

  if [ -f /boot/vmlinuz-$1-$ARCH ]; then
    verbose_msg "copying vmlinuz-$1.$ARCH"
    cp -p /boot/vmlinuz-$1-$ARCH{,.old}
  fi
  if [ -d /lib/modules/$1 ]; then
    rm -rf /lib/modules/$1.old
    cp -a /lib/modules/$1{,.old}
  fi
  if [ -f /boot/config-${1}-$ARCH.gz ]; then
    verbose_msg "copying config-$1.$ARCH.gz"
    cp -p /boot/config-${1}-$ARCH{,.old}.gz
  fi
  if [ -f /boot/System.map-${1}-$ARCH ]; then
    verbose_msg "copying System.map-$1-$ARCH"
    cp -p /boot/System.map-${1}-$ARCH{,.old}
  fi

  invoke_installwatch
}


update_bootloader() {
	plugin_call KERNEL_UPDATEBOOTLOADER $1 $2
}


# function: kernel_config_exists
# usage: kernel_config_exists
# purpose: Verify that a readable kernel config is available
# returns: Config file path, (0) if successful, (1) if config not found
kernel_config_exists() {
    if [ -e /proc/config.gz ]; then
        echo "/proc/config.gz"
    elif [ -e /lib/modules/$(uname -r)/source/.config ]; then
        echo "/lib/modules/$(uname -r)/source/.config"
    elif [ -e /boot/config-$(uname -r)-$(arch).gz ]; then
        echo "/boot/config-$(uname -r)-$(arch).gz"
    elif [ -e /usr/src/linux/.config ]; then
        echo "/usr/src/linux/.config"
    elif [ -e $CONFIG_CACHE/.config.current ]; then
        echo "$CONFIG_CACHE/.config.current"
    elif [ -e $CONFIG_CACHE/.config.2.6.stable ]; then
        echo "$CONFIG_CACHE/.config.2.6.stable"
    else
        return 1
    fi
    return 0
}

# function: kernel_option_present
# usage: kernel_option_present config_option
# purpose: Check if a kernel option is configured
# returns: (0) if option is found and enabled, (1) if option is not found or disabled, (255) if kernel config not found
kernel_option_present() {
    local KERNEL_CONFIG KERNEL_OPTION KERNEL_VALUE CAT
    KERNEL_CONFIG=$(kernel_config_exists) || return 255
    KERNEL_OPTION=$1
    KERNEL_VALUE=$2

    case $KERNEL_CONFIG in
        *.gz)
            CAT=zcat
            ;;
        *)
            CAT=cat
            ;;
    esac

    if [ -n "$KERNEL_VALUE" ]; then
      if $CAT "$KERNEL_CONFIG" | grep -Eq "^$KERNEL_OPTION=\"$KERNEL_VALUE\""; then
        return 0
      fi
    else
      if $CAT "$KERNEL_CONFIG" | grep -Eq "^$KERNEL_OPTION=(y|m)$"; then
        return 0
      fi
    fi

    return 1
}