gen_bootloader.sh

   1 # $Id$
   2
   3 set_bootloader() {
   4         case "${BOOTLOADER}" in
   5                 grub)
   6                         set_bootloader_grub
   7                         ;;
   8                 *)
   9                         print_warning "Bootloader ${BOOTLOADER} is not currently supported"
  10                         ;;
  11         esac
  12 }
  13
  14 set_bootloader_read_fstab() {
  15         local ROOTFS=$(awk 'BEGIN{RS="((#[^\n]*)?\n)"}( $2 == "/" ) { print $1; exit }' /etc/fstab)
  16         local BOOTFS=$(awk 'BEGIN{RS="((#[^\n]*)?\n)"}( $2 == "'${BOOTDIR}'") { print $1; exit }' /etc/fstab)
  17
  18         # If ${BOOTDIR} is not defined in /etc/fstab, it must be the same as /
  19         [ -z "${BOOTFS}" ] && BOOTFS=${ROOTFS}
  20
  21         echo "${ROOTFS} ${BOOTFS}"
  22 }
  23
  24 set_bootloader_grub_read_device_map() {
  25         # Read GRUB device map
  26         [ ! -d ${TEMP} ] && mkdir ${TEMP}
  27         echo "quit" | grub --batch --device-map=${TEMP}/grub.map &>/dev/null
  28         echo "${TEMP}/grub.map"
  29 }
  30
  31 set_bootloader_grub() {
  32         local GRUB_CONF="${BOOTDIR}/grub/grub.conf"
  33
  34         print_info 1 "Adding kernel to ${GRUB_CONF}..."
  35
  36         if [ ! -e ${GRUB_CONF} ]
  37         then
  38                 local GRUB_BOOTFS
  39                 if [ -n "${BOOTFS}" ]
  40                 then
  41                         GRUB_BOOTFS=$BOOTFS
  42                 else
  43                         GRUB_BOOTFS=$(set_bootloader_read_fstab | cut -d' ' -f2)
  44                 fi
  45
  46                 # Get the GRUB mapping for our device
  47                 local GRUB_BOOT_DISK1=$(echo ${GRUB_BOOTFS} | sed -e 's#\(/dev/.\+\)[[:digit:]]\+#\1#')
  48                 local GRUB_BOOT_DISK=$(awk '{if ($2 == "'${GRUB_BOOT_DISK1}'") {gsub(/(\(|\))/, "", $1); print $1;}}' ${TEMP}/grub.map)
  49                 local GRUB_BOOT_PARTITION=$(($(echo ${GRUB_BOOTFS} | sed -e 's#/dev/.\+\([[:digit:]]?*\)#\1#') - 1))
  50
  51                 if [ -n "${GRUB_BOOT_DISK}" -a -n "${GRUB_BOOT_PARTITION}" ]
  52                 then
  53
  54                         # Create grub configuration directory and file if it doesn't exist.
  55                         [ ! -d `dirname ${GRUB_CONF}` ] && mkdir -p `dirname ${GRUB_CONF}`
  56
  57                         touch ${GRUB_CONF}
  58                         echo 'default 0' >> ${GRUB_CONF}
  59                         echo 'timeout 5' >> ${GRUB_CONF}
  60                         echo "root (${GRUB_BOOT_DISK},${GRUB_BOOT_PARTITION})" >> ${GRUB_CONF}
  61                         echo >> ${GRUB_CONF}
  62
  63                         # Add grub configuration to grub.conf
  64                         echo "# Genkernel generated entry, see GRUB documentation for details" >> ${GRUB_CONF}
  65                         echo "title=Gentoo Linux ($KV)" >> ${GRUB_CONF}
  66                         if [ "${BUILD_INITRD}" -eq '0' ]
  67                         then
  68                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=${GRUB_ROOTFS}" >> ${GRUB_CONF}
  69                         else
  70                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=/dev/ram0 init=/linuxrc real_root=${GRUB_ROOTFS}" >> ${GRUB_CONF}
  71                                 if [ "${PAT}" -gt '4' ]
  72                                 then
  73                                     echo -e "\tinitrd /initramfs-${KNAME}-${ARCH}-${KV}" >> ${GRUB_CONF}
  74                                 fi
  75                         fi
  76                         echo >> ${GRUB_CONF}
  77                 else
  78                         print_error 1 "Error! ${BOOTDIR}/grub/grub.conf does not exist and the correct settings can not be automatically detected."
  79                         print_error 1 "Please manually create your ${BOOTDIR}/grub/grub.conf file."
  80                 fi
  81
  82         else
  83                 # The grub.conf already exists, so let's try to duplicate the default entry
  84                 if set_bootloader_grub_check_for_existing_entry "${GRUB_CONF}"; then
  85                         print_warning 1 "An entry was already found for a kernel/initramfs with this name...skipping update"
  86                         return 0
  87                 fi
  88
  89                 set_bootloader_grub_duplicate_default "${GRUB_CONF}"
  90         fi
  91
  92 }
  93
  94 set_bootloader_grub_duplicate_default_replace_kernel_initrd() {
  95         sed -r -e "/^[[:space:]]*kernel/s/kernel-[[:alnum:][:punct:]]+/kernel-${KNAME}-${ARCH}-${KV}/" - |
  96         sed -r -e "/^[[:space:]]*initrd/s/init(rd|ramfs)-[[:alnum:][:punct:]]+/init\1-${KNAME}-${ARCH}-${KV}/"
  97 }
  98
  99 set_bootloader_grub_check_for_existing_entry() {
 100         local GRUB_CONF=$1
 101         if grep -q "^[[:space:]]*kernel[[:space:]=]*.*/kernel-${KNAME}-${ARCH}-${KV}\([[:space:]]\|$\)" "${GRUB_CONF}" &&
 102                 grep -q "^[[:space:]]*initrd[[:space:]=]*.*/initramfs-${KNAME}-${ARCH}-${KV}\([[:space:]]\|$\)" "${GRUB_CONF}"
 103         then
 104                 return 0
 105         fi
 106         return 1
 107 }
 108
 109 set_bootloader_grub_duplicate_default() {
 110         local GRUB_CONF=$1
 111         local GRUB_CONF_TMP="${GRUB_CONF}.tmp"
 112
 113         line_count=$(wc -l < "${GRUB_CONF}")
 114         line_nums="$(grep -n "^title" "${GRUB_CONF}" | cut -d: -f1)"
 115         if [ -z "${line_nums}" ]; then
 116                 print_error 1 "No current 'title' entries found in your grub.conf...skipping update"
 117                 return 0
 118         fi
 119         line_nums="${line_nums} $((${line_count}+1))"
 120
 121         # Find default entry
 122         default=$(sed -rn '/^[[:space:]]*default[[:space:]=]/s/^.*default[[:space:]=]+([[:alnum:]]+).*$/\1/p' "${GRUB_CONF}")
 123     if [ -z "${default}" ]; then
 124                 print_warning 1 "No default entry found...assuming 0"
 125                 default=0
 126         fi
 127         if ! echo ${default} | grep -q '^[0-9]\+$'; then
 128                 print_error 1 "We don't support non-numeric (such as 'saved') default values...skipping update"
 129                 return 0
 130         fi
 131
 132         # Grub defaults are 0 based, cut is 1 based
 133         # Figure out where the default entry lives
 134         startstop=$(echo ${line_nums} | cut -d" " -f$((${default}+1))-$((${default}+2)))
 135         startline=$(echo ${startstop} | cut -d" " -f1)
 136         stopline=$(echo ${startstop} | cut -d" " -f2)
 137
 138         # Write out the bits before the default entry
 139         sed -n 1,$((${startline}-1))p "${GRUB_CONF}" > "${GRUB_CONF_TMP}"
 140
 141         # Put in our title
 142         echo "title=Gentoo Linux (${KV})" >> "${GRUB_CONF_TMP}"
 143
 144         # Pass the default entry (minus the title) through to the replacement function and pipe the output to GRUB_CONF_TMP
 145         sed -n $((${startline}+1)),$((${stopline}-1))p "${GRUB_CONF}" | set_bootloader_grub_duplicate_default_replace_kernel_initrd >> "${GRUB_CONF_TMP}"
 146
 147         # Finish off with everything including the previous default entry
 148         sed -n ${startline},${line_count}p "${GRUB_CONF}" >> "${GRUB_CONF_TMP}"
 149
 150         cp "${GRUB_CONF}" "${GRUB_CONF}.bak"
 151         cp "${GRUB_CONF_TMP}" "${GRUB_CONF}"
 152         rm "${GRUB_CONF_TMP}"
 153 }