gen_bootloader.sh

   1 #!/bin/bash
   2
   3 set_bootloader() {
   4         if [ "x$BOOTLOADER" == 'xgrub' ]
   5         then
   6                 set_grub_bootloader
   7         else
   8                 return 0
   9         fi
  10 }
  11
  12 set_grub_bootloader() {
  13         local GRUB_CONF='/boot/grub/grub.conf'
  14
  15         print_info 1 ''
  16         print_info 1 "Adding kernel to $GRUB_CONF..."
  17
  18         # Extract block device information from /etc/fstab
  19         local GRUB_ROOTFS=$(awk '/[[:space:]]\/[[:space:]]/ { print $1 }' /etc/fstab)
  20         local GRUB_BOOTFS=$(awk '/[[:space:]]\/boot[[:space:]]/ { print $1 }' /etc/fstab)
  21
  22         # If /boot is not defined in /etc/fstab, it must be the same as /
  23         [ "x$GRUB_BOOTFS" == 'x' ] && GRUB_BOOTFS=$GRUB_ROOTFS
  24
  25         # Translate block letters into grub numbers
  26         local GRUB_ROOT_DISK=$(echo $GRUB_ROOTFS | sed -e 's/\/dev\/[hs]d\([[:alpha:]]\)[[:digit:]]\+/\1/')
  27         case $GRUB_ROOT_DISK in
  28                 a )
  29                         GRUB_ROOT_DISK='0' ;;
  30                 b )
  31                         GRUB_ROOT_DISK='1' ;;
  32                 c )
  33                         GRUB_ROOT_DISK='2' ;;
  34                 d )
  35                         GRUB_ROOT_DISK='3' ;;
  36                 e )
  37                         GRUB_ROOT_DISK='4' ;;
  38         esac
  39
  40         # Translate partition numbers into grub numbers
  41         local GRUB_ROOT_PARTITION=$(echo $GRUB_BOOTFS | sed -e 's/\/dev\/[hs]d[[:alpha:]]\([[:digit:]]\+\)/\1/')
  42         local GRUB_ROOT_PARTITION=$(($GRUB_ROOT_PARTITION-1))
  43
  44         # Create grub configuration directory and file if it doesn't exist.
  45         [ ! -e `basename $GRUB_CONF` ] && mkdir -p `basename $GRUB_CONF`
  46
  47         if [ ! -e $GRUB_CONF ]
  48         then
  49                 # grub.conf doesn't exist - create it with standard defaults
  50                 touch $GRUB_CONF
  51                 echo 'default 0' >> $GRUB_CONF
  52                 echo 'timeout 5' >> $GRUB_CONF
  53
  54                 # Add grub configuration to grub.conf
  55                 echo "title=Gentoo Linux ($KV)" >> $GRUB_CONF
  56                 echo -e "\troot (hd$GRUB_ROOT_DISK,$GRUB_ROOT_PARTITION)" >> $GRUB_CONF
  57                 if [ "${BUILD_INITRD}" -eq '0' ]
  58                 then
  59                         echo -e "\tkernel /kernel-$KV root=$GRUB_ROOTFS" >> $GRUB_CONF
  60                 else
  61                         echo -e "\tkernel /kernel-$KV root=/dev/ram0 init=/linuxrc real_root=$GRUB_ROOTFS" >> $GRUB_CONF
  62                         echo -e "\tinitrd /initrd-$KV" >> $GRUB_CONF
  63                 fi
  64         else
  65                 # grub.conf already exists; so...
  66                 # * Copy the first boot definition and change the version.
  67                 cp $GRUB_CONF $GRUB_CONF.bak
  68                 awk 'BEGIN { RS="title=";FS="\n";OFS="\n";ORS=""}
  69                         NR == 2 {
  70                                 sub(/\(.+\)/,"(" ch KV ch ")",$1);
  71                                 sub(/kernel-[[:alnum:][:punct:]]+/, "kernel-" KV, $3);
  72                                 sub(/initrd-[[:alnum:][:punct:]]+/, "initrd-" KV, $4);
  73                                 print RS ch $0 }' \
  74                         KV=$KV $GRUB_CONF.bak >> $GRUB_CONF
  75         fi
  76 }