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         label=`sed -ne 's/^LABEL=\(.\+\)[[:space:]]\+\/[[:space:]]\+.*/\1/p' configs/${CONFIG_TYPE}/fstab-ext3`
  98         prefix=
  99         grep -q ' ${mntpt}/boot ' /proc/mounts && prefix=/boot
 100         for kern in ${mntpt}/boot/vmlinuz-*; do
 101                 v=$(basename $kern | sed 's/vmlinuz-//')
 102                 cat >>${mntpt}/boot/grub/menu.lst<<EOF
 103
 104 title           Debian GNU/Linux, kernel ${v}
 105 root            (hd0,0)
 106 kernel          ${prefix}/vmlinuz-${v} root=LABEL=${label} ro
 107 initrd          ${prefix}/initrd.img-${v}
 108 boot
 109 EOF
 110         done
 111
 112         # grub-install is pretty broken, so we do this manually
 113         geom=`parted -s "$img" "unit chs" "print" | sed -ne 's/geometry: \([0-9]\+\),\([0-9]\+\),\([0-9]\+\)/:\1 \2 \3:/p' | cut -d: -f2`
 114         grub --device-map=/dev/null <<EOF
 115 device (hd0) $img
 116 geometry (hd0) $geom
 117 root (hd0,0)
 118 setup (hd0)
 119 EOF
 120
 121 }
 122
 123 # @img - image to create a filesystem on
 124 # @root_dir - root directory to populate the fs with
 125 mk_ext3_fs()
 126 {
 127         img="$1"
 128         root_dir="$2"
 129
 130         # create root mount point
 131         mount_point_root=$(mktemp)
 132         rm -f $mount_point_root
 133         mkdir $mount_point_root
 134
 135         i=1
 136         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 137                         while read name mntpt fstype extra; do
 138                 partition_start=$(parted -m -s "$img" "unit B" "print" | grep "^$i" | cut -d: -f2 | cut -dB -f1)
 139                 partition_size=$(parted -m -s "$img" "unit B" "print" | grep "^$i" | cut -d: -f4 | cut -dB -f1)
 140                 bs=1024
 141
 142                 # create the filesystems/swap
 143                 attach_loop "$img" "$partition_start"
 144                 if [ "$fstype" = "ext3" ]; then
 145                         mke2fs -q -b $bs -L "$name" -m0 -j "$LOOP_DEV" $((partition_size / bs))
 146                         tune2fs -c0 -i0 "$LOOP_DEV"     # XXX: this is from OLPC days; do we still want this?
 147                 elif [ "$fstype" = "ext2" ]; then
 148                         mke2fs -q -b $bs -L "$name" -m0 "$LOOP_DEV" $((partition_size / bs))
 149                         tune2fs -c0 -i0 "$LOOP_DEV"
 150                 elif [ "$fstype" = "swap" ]; then
 151                         mkswap -L "$name" "$LOOP_DEV" $((partition_size / bs))
 152                 fi
 153                 detach_loop "$LOOP_DEV"
 154
 155                 # mount the root partition if it's found
 156                 if [ "$mntpt" = "/" ]; then
 157                         mount "$img" "${mount_point_root}" -o loop,offset=$partition_start -t $fstype
 158                 fi
 159
 160                 i=$((i + 1))
 161         done
 162
 163         # mount the rest of the partitions (working around /boot coming before /)
 164         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 165                         while read name mntpt fstype extra; do
 166
 167                 # / is already mounted
 168                 if [ "$mntpt" = "/" ]; then
 169                         continue
 170                 fi
 171
 172                 # if $mntpt doesn't start with '/', don't mount it
 173                 if [ "${mntpt##/}" = "$mntpt" ]; then
 174                         continue
 175                 fi
 176
 177                 # parted 1.8 added --machine for easier parsing; however,
 178                 # debian still has 1.7 in unstable.
 179                 partition_start=$(parted -s "$img" "unit B" "print" | sed -ne "s/^ $i[[:space:]]\+//p" | cut -dB -f1)
 180
 181                 [ -d "${mount_point_root}${mntpt}" ] || mkdir -p "${mount_point_root}${mntpt}"
 182                 mount "$img" "${mount_point_root}${mntpt}" -o loop,offset=$partition_start -t $fstype
 183         done
 184
 185         # populate the filesystem
 186         cp -ra "$root_dir"/* "$mount_point_root" || true
 187         grub_install "$img" "$mount_point_root"
 188
 189         # umount the filesystem
 190         sed -ne 's/^LABEL=//p' configs/${CONFIG_TYPE}/fstab-ext3 | \
 191                         while read name mntpt fstype extra; do
 192
 193                 # don't unmount / yet
 194                 if [ "$mntpt" = "/" ]; then
 195                         continue
 196                 fi
 197
 198                 # if $mntpt doesn't start with '/', it's not mounted
 199                 if [ "${mntpt##/}" = "$mntpt" ]; then
 200                         continue
 201                 fi
 202
 203                 umount "${mount_point_root}${mntpt}"
 204         done
 205
 206         umount "${mount_point_root}"
 207         rmdir "${mount_point_root}"
 208 }
 209
 210 usage()
 211 {
 212         echo "" 1>&2
 213         echo "Usage: $0 [<options>] <root directory> <img>" 1>&2
 214         echo "" 1>&2
 215         echo "Options:" 1>&2
 216         echo "  --config-type <config>    directory name in configs/ to use" 1>&2
 217         echo "  --help                    display this help screen" 1>&2
 218         echo "" 1>&2
 219         exit 1
 220 }
 221
 222 while test $# != 0
 223 do
 224         case $1 in
 225         --config-type)
 226                 CONFIG_TYPE=$2
 227                 [ -d ./configs/${CONFIG_TYPE} ] || {
 228                         echo "Error: can't find directory './configs/${CONFIG_TYPE}/'!" 1>&2
 229                         exit 2
 230                 }
 231                 shift
 232                 ;;
 233         --help|-h)
 234                 usage
 235                 ;;
 236         *)
 237                 ROOT_DIR="$1"
 238                 shift
 239                 if [ "$#" = "1" ]; then
 240                         IMG_NAME="$1"
 241                 fi
 242                 ;;
 243         esac
 244         shift
 245 done
 246
 247 if [ "$ROOT_DIR" = "" ]; then
 248         echo "" 1>&2
 249         echo "*** No root directory specified!" 1>&2
 250         usage
 251 fi
 252 if [ "$IMG_NAME" = "" ]; then
 253         echo "" 1>&2
 254         echo "*** No image name specified!" 1>&2
 255         usage
 256 fi
 257 if [ ! -d "$ROOT_DIR" ]; then
 258         echo "" 1>&2
 259         echo "*** Unable to find root directory!" 1>&2
 260         usage
 261 fi
 262
 263 check_for_cmds losetup parted mke2fs tune2fs grub || exit 1
 264
 265 # create image's /etc/fstab
 266 if [ ! -f ./configs/${CONFIG_TYPE}/fstab-ext3 ]; then
 267         echo "*** Unable to find fstab-ext3!" 1>&2
 268         exit 1
 269 fi
 270 sed 's/[[:space:]]#.*//' ./configs/${CONFIG_TYPE}/fstab-ext3 > ${ROOT_DIR}/etc/fstab
 271
 272 # TODO: this needs to go into an OFW package; here it's a hack
 273 # create image's /boot/olpc.fth
 274 if [ -f ./configs/${CONFIG_TYPE}/olpc.fth-ext3 ]; then
 275         cp ./configs/${CONFIG_TYPE}/olpc.fth-ext3 ${ROOT_DIR}/boot/olpc.fth
 276 fi
 277
 278 create_bootable_img ${IMG_NAME}
 279 mk_ext3_fs ${IMG_NAME} ${ROOT_DIR}
 280
 281 #mount ${IMG_NAME}.ext3 $MOUNT_POINT -o loop,offset=$OS_PART1_BEGIN -t ext3
 282 #cp -r "$ROOT_DIR"/* $MOUNT_POINT
 283 #umount $MOUNT_POINT