spindle.queued.net Git - xodist/blob - mkext3.sh

   1 #!/bin/bash -e
   2 #
   3 # Copyright © 2008-2009  Andres Salomon <dilinger@collabora.co.uk>
   4 #
   5 # This file is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful, but
  11 # WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19 IMG_NAME=""
  20 ROOT_DIR=""
  21
  22 . ./functions.sh
  23
  24 CONFIG_TYPE=generic
  25
  26 # @img - fs image to attach loop device to
  27 # @offset - if the image is partitioned, the offset to attach at
  28 #
  29 # sets $LOOP_DEV with the path of the newly attached loop device
  30 attach_loop()
  31 {
  32         img="$1"
  33         offset="$2"
  34
  35         LOOP_DEV=$(losetup -f)
  36
  37         if [ "$offset" != "" ]; then
  38                 losetup -o "$offset" "$LOOP_DEV" "$img"
  39         else
  40                 losetup "$LOOP_DEV" "$img"
  41         fi
  42 }
  43
  44 # @dev - the loop device to detach
  45 detach_loop()
  46 {
  47         losetup -d "$1"
  48 }
  49
  50 # @img - image name to create
  51 create_bootable_img()
  52 {
  53         img="$1"
  54
  55         # get the total size by summing all the partition sizes (listed in fstab comments)
  56         partition_sizes=`grep '^LABEL=' configs/${CONFIG_TYPE}/fstab-ext3 | \
  57                         sed 's/.*#[[:space:]]\+\([0-9]\+\)$/\1/' | xargs echo | tr ' ' +`
  58         size=$(($partition_sizes))
  59
  60         # there's some partition overhead; pad the image so that parted doesn't whine
  61         overhead=`echo | awk "{ printf(\"%d\n\", 0.014 * $size); }"`
  62         size=$((size + overhead))
  63
  64         # first, create a sparse image
  65         minus_size=$(($size * 6 / 100))
  66         size=$(($size - $minus_size))
  67         dd if=/dev/zero of=$img bs=1M count=1 seek=$(($size - 1))
  68
  69         # fill in the partition table
  70         parted -s "$img" "mklabel msdos"
  71         prior=0
  72         grep '^LABEL=' configs/${CONFIG_TYPE}/fstab-ext3 | \
  73                         sed 's/.*#[[:space:]]\+\([0-9]\+\)$/\1/' | while read s; do
  74                 end=$((prior + s))
  75                 parted -s "$img" "mkpart primary ext2 $prior $end"
  76                 prior=$end
  77         done
  78         parted -s "$img" "set 1 boot on"
  79 }
  80
  81 # @img - image name
  82 # @mntpt - path to mounted root directory
  83 grub_install()
  84 {
  85         img="$1"
  86         mntpt="$2"
  87
  88         mkdir -p ${mntpt}/boot/grub
  89         cp /usr/lib/grub/i386-pc/stage[12] ${mntpt}/boot/grub
  90         cp /usr/lib/grub/i386-pc/e2fs_stage1_5 ${mntpt}/boot/grub
  91
  92         cat >${mntpt}/boot/grub/menu.lst<<EOF
  93 default 0
  94 timeout 5
  95 color cyan/blue white/blue
  96 EOF
  97         installer_added=0
  98         label=`sed -ne 's/^LABEL=\(.\+\)[[:space:]]\+\/[[:space:]]\+.*/\1/p' configs/${CONFIG_TYPE}/fstab-ext3`
  99         prefix=
 100         grep -q ' ${mntpt}/boot ' /proc/mounts && prefix=/boot
 101         for kern in ${mntpt}/boot/vmlinuz-*; do
 102                 v=$(basename $kern | sed 's/vmlinuz-//')
 103                 if [ "${v}" = '*' ]; then
 104                         echo "*** Error: no kernel images found in /boot!" 1>&2
 105                         exit 1
 106                 fi
 107                 cat >>${mntpt}/boot/grub/menu.lst<<EOF
 108
 109 title           Debian GNU/Linux, kernel ${v}
 110 root            (hd0,0)
 111 kernel          ${prefix}/vmlinuz-${v} root=LABEL=${label} ro
 112 initrd          ${prefix}/initrd.img-${v}
 113 boot
 114 EOF
 115                 if [ "$installer_added" = "0" ]; then
 116                         installer_added=1
 117                         cat >>${mntpt}/boot/grub/menu.lst<<EOF
 118
 119 title           Debian GNU/Linux Installer
 120 root            (hd0,0)
 121 kernel          ${prefix}/vmlinuz-${v} root=LABEL=${label} ro installer
 122 initrd          ${prefix}/initrd.img-${v}
 123 boot
 124 EOF
 125                 fi
 126
 127         done
 128
 129         # grub-install is pretty broken, so we do this manually
 130         geom=`parted -s "$img" "unit chs" "print" | sed -ne 's/geometry: \([0-9]\+\),\([0-9]\+\),\([0-9]\+\)/:\1 \2 \3:/p' | cut -d: -f2`
 131         grub --device-map=/dev/null <<EOF
 132 device (hd0) $img
 133 geometry (hd0) $geom
 134 root (hd0,0)
 135 setup (hd0)
 136 EOF
 137
 138 }
 139
 140 # @img - image to create a filesystem on
 141 # @root_dir - root directory to populate the fs with
 142 mk_ext3_fs()
 143 {
 144         img="$1"
 145         root_dir="$2"
 146
 147         # create root mount point
 148         mount_point_root=$(mktemp)
 149         rm -f $mount_point_root
 150         mkdir $mount_point_root
 151
 152         i=1
 153         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 154                         while read name mntpt fstype extra; do
 155                 partition_start=$(parted -m -s "$img" "unit B" "print" | grep "^$i" | cut -d: -f2 | cut -dB -f1)
 156                 partition_size=$(parted -m -s "$img" "unit B" "print" | grep "^$i" | cut -d: -f4 | cut -dB -f1)
 157                 bs=1024
 158
 159                 # create the filesystems/swap
 160                 attach_loop "$img" "$partition_start"
 161                 if [ "$fstype" = "ext3" ]; then
 162                         mke2fs -q -b $bs -L "$name" -m0 -j "$LOOP_DEV" $((partition_size / bs))
 163                         tune2fs -c0 -i0 "$LOOP_DEV"     # XXX: this is from OLPC days; do we still want this?
 164                 elif [ "$fstype" = "ext2" ]; then
 165                         mke2fs -q -b $bs -L "$name" -m0 "$LOOP_DEV" $((partition_size / bs))
 166                         tune2fs -c0 -i0 "$LOOP_DEV"
 167                 elif [ "$fstype" = "swap" ]; then
 168                         mkswap -L "$name" "$LOOP_DEV" $((partition_size / bs))
 169                 fi
 170                 detach_loop "$LOOP_DEV"
 171
 172                 # mount the root partition if it's found
 173                 if [ "$mntpt" = "/" ]; then
 174                         mount "$img" "${mount_point_root}" -o loop,offset=$partition_start -t $fstype
 175                 fi
 176
 177                 i=$((i + 1))
 178         done
 179
 180         # mount the rest of the partitions (working around /boot coming before /)
 181         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 182                         while read name mntpt fstype extra; do
 183
 184                 # / is already mounted
 185                 if [ "$mntpt" = "/" ]; then
 186                         continue
 187                 fi
 188
 189                 # if $mntpt doesn't start with '/', don't mount it
 190                 if [ "${mntpt##/}" = "$mntpt" ]; then
 191                         continue
 192                 fi
 193
 194                 # parted 1.8 added --machine for easier parsing; however,
 195                 # debian still has 1.7 in unstable.
 196                 partition_start=$(parted -s "$img" "unit B" "print" | sed -ne "s/^ $i[[:space:]]\+//p" | cut -dB -f1)
 197
 198                 [ -d "${mount_point_root}${mntpt}" ] || mkdir -p "${mount_point_root}${mntpt}"
 199                 mount "$img" "${mount_point_root}${mntpt}" -o loop,offset=$partition_start -t $fstype
 200         done
 201
 202         # populate the filesystem
 203         cp -ra "$root_dir"/* "$mount_point_root" || true
 204         grub_install "$img" "$mount_point_root"
 205
 206         # umount the filesystem
 207         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 208                         while read name mntpt fstype extra; do
 209
 210                 # don't unmount / yet
 211                 if [ "$mntpt" = "/" ]; then
 212                         continue
 213                 fi
 214
 215                 # if $mntpt doesn't start with '/', it's not mounted
 216                 if [ "${mntpt##/}" = "$mntpt" ]; then
 217                         continue
 218                 fi
 219
 220                 umount "${mount_point_root}${mntpt}"
 221         done
 222
 223         umount "${mount_point_root}"
 224         rmdir "${mount_point_root}"
 225 }
 226
 227 usage()
 228 {
 229         echo "" 1>&2
 230         echo "Usage: $0 [<options>] <root directory> <img>" 1>&2
 231         echo "" 1>&2
 232         echo "Options:" 1>&2
 233         echo "  --config-type <config>    directory name in configs/ to use" 1>&2
 234         echo "  --help                    display this help screen" 1>&2
 235         echo "" 1>&2
 236         exit 1
 237 }
 238
 239 while test $# != 0
 240 do
 241         case $1 in
 242         --config-type)
 243                 CONFIG_TYPE=$2
 244                 [ -d ./configs/${CONFIG_TYPE} ] || {
 245                         echo "Error: can't find directory './configs/${CONFIG_TYPE}/'!" 1>&2
 246                         exit 2
 247                 }
 248                 shift
 249                 ;;
 250         --help|-h)
 251                 usage
 252                 ;;
 253         *)
 254                 ROOT_DIR="$1"
 255                 shift
 256                 if [ "$#" = "1" ]; then
 257                         IMG_NAME="$1"
 258                 fi
 259                 ;;
 260         esac
 261         shift
 262 done
 263
 264 if [ "$ROOT_DIR" = "" ]; then
 265         echo "" 1>&2
 266         echo "*** No root directory specified!" 1>&2
 267         usage
 268 fi
 269 if [ "$IMG_NAME" = "" ]; then
 270         echo "" 1>&2
 271         echo "*** No image name specified!" 1>&2
 272         usage
 273 fi
 274 if [ ! -d "$ROOT_DIR" ]; then
 275         echo "" 1>&2
 276         echo "*** Unable to find root directory!" 1>&2
 277         usage
 278 fi
 279
 280 check_for_cmds losetup parted mke2fs tune2fs grub || exit 1
 281
 282 # create image's /etc/fstab
 283 if [ ! -f ./configs/${CONFIG_TYPE}/fstab-ext3 ]; then
 284         echo "*** Unable to find fstab-ext3!" 1>&2
 285         exit 1
 286 fi
 287 sed 's/[[:space:]]#.*//' ./configs/${CONFIG_TYPE}/fstab-ext3 > ${ROOT_DIR}/etc/fstab
 288
 289 # TODO: this needs to go into an OFW package; here it's a hack
 290 # create image's /boot/olpc.fth
 291 if [ -f ./configs/${CONFIG_TYPE}/olpc.fth-ext3 ]; then
 292         cp ./configs/${CONFIG_TYPE}/olpc.fth-ext3 ${ROOT_DIR}/boot/olpc.fth
 293 fi
 294
 295 create_bootable_img ${IMG_NAME}
 296 mk_ext3_fs ${IMG_NAME} ${ROOT_DIR}
 297
 298 #mount ${IMG_NAME}.ext3 $MOUNT_POINT -o loop,offset=$OS_PART1_BEGIN -t ext3
 299 #cp -r "$ROOT_DIR"/* $MOUNT_POINT
 300 #umount $MOUNT_POINT