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author | Alex AUVOLAT <alex.auvolat@ens.fr> | 2014-03-28 09:10:23 +0100 |
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committer | Alex AUVOLAT <alex.auvolat@ens.fr> | 2014-03-28 09:10:23 +0100 |
commit | bb55beef914e7488350ad1d0419d4bc60ad63c99 (patch) | |
tree | b1cfe0e5c76cbca16e7e3c16e108c23e366a2902 /sos-code-article2/support/build_image.sh | |
download | SOS-bb55beef914e7488350ad1d0419d4bc60ad63c99.tar.gz SOS-bb55beef914e7488350ad1d0419d4bc60ad63c99.zip |
Import code for article1, 2, 3, 4
Diffstat (limited to 'sos-code-article2/support/build_image.sh')
-rwxr-xr-x | sos-code-article2/support/build_image.sh | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/sos-code-article2/support/build_image.sh b/sos-code-article2/support/build_image.sh new file mode 100755 index 0000000..43929cd --- /dev/null +++ b/sos-code-article2/support/build_image.sh @@ -0,0 +1,215 @@ +#!/bin/sh +# Copyright (C) 2003, David Decotigny + +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License +# as published by the Free Software Foundation; either version 2 +# of the License, or (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. + +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, +# USA. + +# 1) What does it do ? +# +# 1) Check where Grub is installed (lookup_grub) +# 2) Assign some local variables using the shell script arguments. +# a) Argument 1 : the destination (either a file or a drive, like a:) +# b) Argument 2 : the loader (i.e kernel) +# c) Argument 3 : options passed to the loader +# d) Argument 4 : the modules (that can be loaded optionally by Grub) +# 3) Test whether destination is a drive or a file +# 4) Create the directory structure inside the drive +# 5) Copy the loader in the drive +# 6) Generate the 'menu.txt' file used by Grub to generate the boot menu +# 7) Copy all modules +# 8) Copy the menu.txt file +# +# 2) Why is it so complex ? +# Because it must support various Grub/mtools installations and versions +# +# In fact, this shell script is used in the KOS (kos.enix.org) +# project. This operating system consists in a loader and many many +# modules that are linked together at boot time. It is much more +# complex that a simple monolithic kernel. +# +# For your simple monolithic kernel, you only need to give argument 1 +# and 2. + +print_usage () { + echo "Usage: $0 [X:|image] path/to/loader option path/to/modules..." + echo " where X: is a valid floppy drive on your computer" + echo " where image is any file name" + exit 1 +} + +grub_dirs_common="/usr/local/share/grub/i386-freebsd /usr/local/share/grub/i386-pc /usr/share/grub/i386-pc /usr/lib/grub/i386-pc /usr/local/grub /usr/share/grub/i386-redhat /usr/local/src/grub-0.5.94 $HOME/share/grub/i386-pc/" +sbin_grub_path="/usr/local/sbin /usr/sbin /sbin $HOME/sbin" + +PATH=$PATH:/sbin:/usr/sbin:/usr/local/sbin +export PATH + +MTOOLSRC=mtoolsrc +export MTOOLSRC + +# Redefined variables +FLOPPY_DRIVE=A: +IMG_FNAME=fd.img + +## +## Format disk image +## +init_image () { + echo "Initialize disk image $IMG_FILE..." + if [ ! -f $IMG_FNAME ] ; then + dd if=/dev/zero of=$IMG_FNAME bs=18k count=80 1>/dev/null 2>&1 + fi + + rm -f $MTOOLSRC + echo "drive u: file=\"$IMG_FNAME\" 1.44M filter" > $MTOOLSRC + + if mformat U: ; then : ; else + rm -f $MTOOLSRC + echo "drive u: file=\"$IMG_FNAME\" 1.44M" > $MTOOLSRC + if mformat U: ; then : ; else + rm -f $MTOOLSRC + echo "drive u: file=\"$IMG_FNAME\"" > $MTOOLSRC + mformat U: + fi + fi +} + + +## +## Format (real) floppy disk +## +init_floppy () { + echo "Formatting floppy..." + mformat $FLOPPY_DRIVE || exit 1 +} + + +lookup_grub () { + # Look for a correct GRUBDIR + for d in $grub_dirs_common ; do + if [ -d $d ] ; then + GRUBDIR=$d + break + fi + done + + # Try to guess with locate + if [ ! -d "$GRUBDIR" ] ; then + GRUBDIR=`locate stage2 | head -1 | xargs dirname 2>/dev/null` + fi + + # Look for a correct sbin/grub + for d in $sbin_grub_path ; do + if [ -x $d/grub ] ; then + SBIN_GRUB=$d/grub + break + fi + done + + if [ -d "$GRUBDIR" -a -x "$SBIN_GRUB" ] ; then + echo "Found correct grub installation in $GRUBDIR" + echo "Found correct /sbin/grub at $SBIN_GRUB" + else + echo "Couldn't find a correct grub installation." + exit 1 + fi +} + +## +## setup_disk [drive] +## => setup disk directory structure / copy files +## +setup_disk () { + echo "Setup destination disk..." + + mmd $1/boot + mmd $1/boot/grub + + if [ -d $GRUBDIR/stage1 ] ; then + mcopy $GRUBDIR/stage1/stage1 $1/boot/grub/ + mcopy $GRUBDIR/stage2/stage2 $1/boot/grub/ + else + mcopy $GRUBDIR/stage1 $1/boot/grub/ + mcopy $GRUBDIR/stage2 $1/boot/grub/ + fi + mmd $1/system + mmd $1/modules + + $SBIN_GRUB --batch <<EOT 1>/dev/null 2>/dev/null || exit 1 +device (fd0) $IMG_FNAME +install (fd0)/boot/grub/stage1 (fd0) (fd0)/boot/grub/stage2 p (fd0)/boot/grub/menu.txt +quit +EOT +} + + + +################################################# +## Real start +## +#[ "$#" -lt 3 ] && print_usage + +lookup_grub + +dest="$1" ; shift +loader_fname="$1" ; shift +options="$1" ; shift +modules="$*" + +# Init destination disk +case x$dest in + x*:) + drive=$dest + IMG_FNAME=$dest + FLOPPY_DRIVE=$dest + init_floppy + ;; + x*) + drive=U: + IMG_FNAME=$dest + init_image + ;; +esac + +# Create directory structure +setup_disk $drive + +# Copy the loader +mcopy -bo $loader_fname $drive/system/`basename $loader_fname` + +# Generate the menu.txt file +rm -f menu.txt +cat <<EOF > menu.txt +timeout 0 +default 0 +title Simple OS +root (fd0) +kernel /system/`basename $loader_fname` $options +EOF + +# Copy the modules +for f in $modules ; do + if [ ! -f $f ] ; then + echo "ERROR: module $f not correctly compiled in." + exit 1 + fi + if ! mcopy -bo $f $drive/modules/`basename $f` ; then + echo "ERROR: module $f could not be transferred to floppy." + exit 1 + fi + echo module /modules/`basename $f` >> menu.txt +done + +# Transfers the menu.txt file to floppy +mcopy -bo menu.txt $drive/boot/grub/ |