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         # Read GRUB device map
  26         [ ! -d ${tmp} ] && mkdir ${tmp}
  27         grub --batch --device-map=${tmp}/grub.map <<EOF >/dev/null
  28 quit
  29 EOF
  30
  31         # Get the GRUB mapping for our device
  32         local GRUB_BOOT_DISK1=$(echo $GRUB_BOOTFS | sed -e 's#\(/dev/.\+\)[[:digit:]]\+#\1#')
  33         local GRUB_BOOT_DISK=$(awk '{if ($2 == "'$GRUB_BOOT_DISK1'") {gsub(/(\(|\))/, "", $1); print $1;}}' ${tmp}/grub.map)
  34
  35         local GRUB_BOOT_PARTITION=$(echo $GRUB_BOOTFS | sed -e 's#/dev/.\+\([[:digit:]]\+\)#\1#')
  36         [ ! -d ${tmp} ] && rm -r ${tmp}
  37
  38         # Create grub configuration directory and file if it doesn't exist.
  39         [ ! -e `basename $GRUB_CONF` ] && mkdir -p `basename $GRUB_CONF`
  40
  41         if [ ! -e $GRUB_CONF ]
  42         then
  43                 if [ "${GRUB_BOOT_DISK}" = '' -o "${GRUB_BOOT_PARTITION}" = '' ]
  44                 then
  45                         print_error 1 'Error! /boot/grub/grub.conf does not exist and the correct settings can\'t be automatically detected.'
  46                         print_error 1 'Please manually create your /boot/grub/grub.conf file.'
  47                 else
  48                         # grub.conf doesn't exist - create it with standard defaults
  49                         touch $GRUB_CONF
  50                         echo 'default 0' >> $GRUB_CONF
  51                         echo 'timeout 5' >> $GRUB_CONF
  52                         echo >> $GRUB_CONF
  53
  54                         # Add grub configuration to grub.conf
  55                         echo "# Genkernel generated entry, see GRUB documentation for details" >> $GRUB_CONF
  56                         echo "title=Gentoo Linux ($KV)" >> $GRUB_CONF
  57                         echo -e "\troot ($GRUB_BOOT_DISK,$GRUB_BOOT_PARTITION)" >> $GRUB_CONF
  58                         if [ "${BUILD_INITRD}" -eq '0' ]
  59                         then
  60                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=$GRUB_ROOTFS" >> $GRUB_CONF
  61                         else
  62                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=/dev/ram0 init=/linuxrc real_root=$GRUB_ROOTFS" >> $GRUB_CONF
  63                                 if [ "${PAT}" -gt '4' -a  "${CMD_BOOTSPLASH}" != '1' ]
  64                                 then
  65                                     echo -e "\tinitrd /initramfs-${KNAME}-${ARCH}-${KV}" >> $GRUB_CONF
  66                                 else
  67                                     echo -e "\tinitrd /initrd-${KNAME}-${ARCH}-${KV}" >> $GRUB_CONF
  68                                 fi
  69                         fi
  70                         echo >> $GRUB_CONF
  71                 fi
  72         else
  73                 # grub.conf already exists; so...
  74                 # ... Clone the first boot definition and change the version.
  75                 local TYPE
  76                 [ "${KERN_24}" -eq '1' ] && TYPE='rd' || TYPE='ramfs'
  77
  78                 cp $GRUB_CONF $GRUB_CONF.bak
  79                 awk 'BEGIN { RS="" ; FS="\n" ; OFS="\n" ; ORS="\n\n" }
  80                         NR == 2 {
  81                                 ORIG=$0;
  82                                 sub(/\(.+\)/,"(" KV ")",$1);
  83                                 sub(/kernel-[[:alnum:][:punct:]]+/, "kernel-" KNAME "-" ARCH "-" KV, $3);
  84                                 sub(/initr(d|amfs)-[[:alnum:][:punct:]]+/, "init" TYPE "-" KNAME "-" ARCH "-" KV, $4);
  85                                 print RS $0;
  86                                 print RS ORIG;}
  87                         NR != 2 { print RS $0; }' KNAME=$KNAME ARCH=$ARCH KV=$KV TYPE=$TYPE $GRUB_CONF.bak > $GRUB_CONF
  88         fi
  89 }