gen_bootloader.sh

   1 # $Id$
   2
   3 set_bootloader() {
   4         case "${BOOTLOADER}" in
   5                 grub)
   6                         set_bootloader_grub
   7                         ;;
   8                 grub2)
   9                         set_bootloader_grub2
  10                         ;;
  11                 *)
  12                         print_warning "Bootloader ${BOOTLOADER} is not currently supported"
  13                         ;;
  14         esac
  15 }
  16
  17 set_bootloader_read_fstab() {
  18         local ROOTFS=$(awk 'BEGIN{RS="((#[^\n]*)?\n)"}( $2 == "/" ) { print $1; exit }' /etc/fstab)
  19         local BOOTFS=$(awk 'BEGIN{RS="((#[^\n]*)?\n)"}( $2 == "'${BOOTDIR}'") { print $1; exit }' /etc/fstab)
  20
  21         # If ${BOOTDIR} is not defined in /etc/fstab, it must be the same as /
  22         [ -z "${BOOTFS}" ] && BOOTFS=${ROOTFS}
  23
  24         echo "${ROOTFS} ${BOOTFS}"
  25 }
  26
  27 set_bootloader_grub_read_device_map() {
  28         # Read GRUB device map
  29         [ ! -d ${TEMP} ] && mkdir ${TEMP}
  30         echo "quit" | grub --batch --device-map=${TEMP}/grub.map &>/dev/null
  31         echo "${TEMP}/grub.map"
  32 }
  33
  34 set_bootloader_grub2() {
  35     local GRUB_CONF
  36         for candidate in \
  37                         "${BOOTDIR}/grub2/grub.cfg" \
  38                         "${BOOTDIR}/grub/grub.cfg" \
  39                         ; do
  40                 if [[ -e "${candidate}" ]]; then
  41                         GRUB_CONF=${candidate}
  42                         break
  43                 fi
  44         done
  45
  46         if [[ -z "${GRUB_CONF}" ]]; then
  47                 print_error 1 "Error! Grub2 configuration file does not exist, please ensure grub2 is correctly setup first."
  48                 return 0
  49     fi
  50
  51     print_info 1 "You can customize Grub2 parameters in /etc/default/grub."
  52     print_info 1 "Running grub2-mkconfig to create ${GRUB_CONF}..."
  53     grub2-mkconfig -o "${GRUB_CONF}"
  54 }
  55
  56 set_bootloader_grub() {
  57         local GRUB_CONF="${BOOTDIR}/grub/grub.conf"
  58
  59         print_info 1 "Adding kernel to ${GRUB_CONF}..."
  60
  61         if [ ! -e ${GRUB_CONF} ]
  62         then
  63                 local GRUB_BOOTFS
  64                 if [ -n "${BOOTFS}" ]
  65                 then
  66                         GRUB_BOOTFS=$BOOTFS
  67                 else
  68                         GRUB_BOOTFS=$(set_bootloader_read_fstab | cut -d' ' -f2)
  69                 fi
  70
  71                 # Get the GRUB mapping for our device
  72                 local GRUB_BOOT_DISK1=$(echo ${GRUB_BOOTFS} | sed -e 's#\(/dev/.\+\)[[:digit:]]\+#\1#')
  73                 local GRUB_BOOT_DISK=$(awk '{if ($2 == "'${GRUB_BOOT_DISK1}'") {gsub(/(\(|\))/, "", $1); print $1;}}' ${TEMP}/grub.map)
  74                 local GRUB_BOOT_PARTITION=$(($(echo ${GRUB_BOOTFS} | sed -e 's#/dev/.\+\([[:digit:]]?*\)#\1#') - 1))
  75
  76                 if [ -n "${GRUB_BOOT_DISK}" -a -n "${GRUB_BOOT_PARTITION}" ]
  77                 then
  78
  79                         # Create grub configuration directory and file if it doesn't exist.
  80                         [ ! -d `dirname ${GRUB_CONF}` ] && mkdir -p `dirname ${GRUB_CONF}`
  81
  82                         touch ${GRUB_CONF}
  83                         echo 'default 0' >> ${GRUB_CONF}
  84                         echo 'timeout 5' >> ${GRUB_CONF}
  85                         echo "root (${GRUB_BOOT_DISK},${GRUB_BOOT_PARTITION})" >> ${GRUB_CONF}
  86                         echo >> ${GRUB_CONF}
  87
  88                         # Add grub configuration to grub.conf
  89                         echo "# Genkernel generated entry, see GRUB documentation for details" >> ${GRUB_CONF}
  90                         echo "title=Gentoo Linux ($KV)" >> ${GRUB_CONF}
  91                         if [ "${BUILD_INITRD}" = '0' ]
  92                         then
  93                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=${GRUB_ROOTFS}" >> ${GRUB_CONF}
  94                         else
  95                                 echo -e "\tkernel /kernel-${KNAME}-${ARCH}-${KV} root=/dev/ram0 init=/linuxrc real_root=${GRUB_ROOTFS}" >> ${GRUB_CONF}
  96                                 if [ "${PAT}" -gt '4' ]
  97                                 then
  98                                     echo -e "\tinitrd /initramfs-${KNAME}-${ARCH}-${KV}" >> ${GRUB_CONF}
  99                                 fi
 100                         fi
 101                         echo >> ${GRUB_CONF}
 102                 else
 103                         print_error 1 "Error! ${BOOTDIR}/grub/grub.conf does not exist and the correct settings can not be automatically detected."
 104                         print_error 1 "Please manually create your ${BOOTDIR}/grub/grub.conf file."
 105                 fi
 106
 107         else
 108                 # The grub.conf already exists, so let's try to duplicate the default entry
 109                 if set_bootloader_grub_check_for_existing_entry "${GRUB_CONF}"; then
 110                         print_warning 1 "An entry was already found for a kernel/initramfs with this name...skipping update"
 111                         return 0
 112                 fi
 113
 114                 set_bootloader_grub_duplicate_default "${GRUB_CONF}"
 115         fi
 116
 117 }
 118
 119 set_bootloader_grub_duplicate_default_replace_kernel_initrd() {
 120         sed -r -e "/^[[:space:]]*kernel/s/kernel-[[:alnum:][:punct:]]+/kernel-${KNAME}-${ARCH}-${KV}/" - |
 121         sed -r -e "/^[[:space:]]*initrd/s/init(rd|ramfs)-[[:alnum:][:punct:]]+/init\1-${KNAME}-${ARCH}-${KV}/"
 122 }
 123
 124 set_bootloader_grub_check_for_existing_entry() {
 125         local GRUB_CONF=$1
 126         if grep -q "^[[:space:]]*kernel[[:space:]=]*.*/kernel-${KNAME}-${ARCH}-${KV}\([[:space:]]\|$\)" "${GRUB_CONF}" &&
 127                 grep -q "^[[:space:]]*initrd[[:space:]=]*.*/initramfs-${KNAME}-${ARCH}-${KV}\([[:space:]]\|$\)" "${GRUB_CONF}"
 128         then
 129                 return 0
 130         fi
 131         return 1
 132 }
 133
 134 set_bootloader_grub_duplicate_default() {
 135         local GRUB_CONF=$1
 136         local GRUB_CONF_TMP="${GRUB_CONF}.tmp"
 137
 138         line_count=$(wc -l < "${GRUB_CONF}")
 139         line_nums="$(grep -n "^title" "${GRUB_CONF}" | cut -d: -f1)"
 140         if [ -z "${line_nums}" ]; then
 141                 print_error 1 "No current 'title' entries found in your grub.conf...skipping update"
 142                 return 0
 143         fi
 144         line_nums="${line_nums} $((${line_count}+1))"
 145
 146         # Find default entry
 147         default=$(sed -rn '/^[[:space:]]*default[[:space:]=]/s/^.*default[[:space:]=]+([[:alnum:]]+).*$/\1/p' "${GRUB_CONF}")
 148     if [ -z "${default}" ]; then
 149                 print_warning 1 "No default entry found...assuming 0"
 150                 default=0
 151         fi
 152         if ! echo ${default} | grep -q '^[0-9]\+$'; then
 153                 print_error 1 "We don't support non-numeric (such as 'saved') default values...skipping update"
 154                 return 0
 155         fi
 156
 157         # Grub defaults are 0 based, cut is 1 based
 158         # Figure out where the default entry lives
 159         startstop=$(echo ${line_nums} | cut -d" " -f$((${default}+1))-$((${default}+2)))
 160         startline=$(echo ${startstop} | cut -d" " -f1)
 161         stopline=$(echo ${startstop} | cut -d" " -f2)
 162
 163         # Write out the bits before the default entry
 164         sed -n 1,$((${startline}-1))p "${GRUB_CONF}" > "${GRUB_CONF_TMP}"
 165
 166         # Put in our title
 167         echo "title=Gentoo Linux (${KV})" >> "${GRUB_CONF_TMP}"
 168
 169         # Pass the default entry (minus the title) through to the replacement function and pipe the output to GRUB_CONF_TMP
 170         sed -n $((${startline}+1)),$((${stopline}-1))p "${GRUB_CONF}" | set_bootloader_grub_duplicate_default_replace_kernel_initrd >> "${GRUB_CONF_TMP}"
 171
 172         # Finish off with everything including the previous default entry
 173         sed -n ${startline},${line_count}p "${GRUB_CONF}" >> "${GRUB_CONF_TMP}"
 174
 175         cp "${GRUB_CONF}" "${GRUB_CONF}.bak"
 176         cp "${GRUB_CONF_TMP}" "${GRUB_CONF}"
 177         rm "${GRUB_CONF_TMP}"
 178 }