From 4012f4301660a23c872724a0a70f8024df093dd2 Mon Sep 17 00:00:00 2001
From: Andres Salomon <dilinger@debian.org>
Date: Tue, 19 Aug 2008 15:06:31 -0400
Subject: [PATCH] initial import

Signed-off-by: Andres Salomon <dilinger@debian.org>
---
 crcimg.pl |  11 +++
 mkimg.sh  | 267 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 278 insertions(+)
 create mode 100644 crcimg.pl
 create mode 100644 mkimg.sh

diff --git a/crcimg.pl b/crcimg.pl
new file mode 100644
index 0000000..37029f8
--- /dev/null
+++ b/crcimg.pl
@@ -0,0 +1,11 @@
+#!/usr/bin/perl -w
+
+use strict;
+use String::CRC32;
+
+my ($crc, $buf);
+while (read(STDIN, $buf, 0x20000) eq 0x20000) {
+	$crc = crc32($buf);
+	printf("%08lx\n", $crc);
+}
+
diff --git a/mkimg.sh b/mkimg.sh
new file mode 100644
index 0000000..a56e4b7
--- /dev/null
+++ b/mkimg.sh
@@ -0,0 +1,267 @@
+#!/bin/sh -e
+#
+# Copyright © 2008  Andres Salomon <dilinger@queued.net>
+#
+# This file 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.
+#
+
+
+IMG_NAME="DebOLPC"
+ROOT_SIZE="512"
+IMG_LABEL="DebOLPC"
+ROOT_DIR=""
+CRCIMG="./crcimg.pl"
+
+
+PREREQ_CMDS="losetup dd parted mke2fs tune2fs grub"
+
+check_for_cmds()
+{
+	err=0
+	for cmd in $PREREQ_CMDS; do
+		which $cmd >/dev/null || {
+			echo "Missing required command '$cmd'!" 1>&2
+			err=1
+		}
+	done
+	if [ "$err" = 1 ]; then
+		exit 1
+	fi
+}
+
+# @img - fs image to attach loop device to
+# @offset - if the image is partitioned, the offset to attach at
+#
+# sets $LOOP_DEV with the path of the newly attached loop device
+attach_loop()
+{
+	img="$1"
+	offset="$2"
+
+	LOOP_DEV=$(losetup -f)
+
+	if [ "$offset" != "" ]; then
+		losetup -o "$offset" "$LOOP_DEV" "$img"
+	else
+		losetup "$LOOP_DEV" "$img"
+	fi
+}
+
+# @dev - the loop device to detach
+detach_loop()
+{
+	losetup -d "$1"
+}
+
+# @img - fs image to mount
+# @type - fs type to mount
+# @offset - if the image is partitioned, the offset to mount at
+#
+# sets $MOUNT_POINT with the path of the newly created (and mounted) dir
+mk_mount()
+{
+	img="$1"
+	type="$2"
+	offset="$3"
+
+	if [ "$offset" != "" ]; then
+		offset=",offset=$offset"
+	fi
+
+	MOUNT_POINT=$(mktemp)
+	rm -f $MOUNT_POINT
+	mkdir $MOUNT_POINT
+
+	mount "$img" "$MOUNT_POINT" -o loop$offset -t "$type"
+}
+
+# @mntpt - directory to umount and delete
+rm_mount()
+{
+	umount "$1"
+	rmdir "$1"
+}
+
+# @img - image name to create
+# @size - image size
+mk_bootable_img()
+{
+	img="$1"
+	size="$2"
+
+	# first, create a sparse image
+	minus_size=$(($size * 6 / 100))
+	size=$(($size - $minus_size))
+	dd if=/dev/zero of=$img bs=1M count=1 seek=$(($size - 1))
+
+	# fill in the partition table
+	parted -s "$img" "mklabel msdos"
+	parted -s "$img" "mkpart primary ext2 0 -1"
+	parted -s "$img" "set 1 boot on"
+}
+
+# @mntpt - path to mounted root directory
+# @fstype - the root filesystem type (in a form that 'mount' understands)
+mk_fstab()
+{
+	mntpt="$1"
+	fstype="$2"
+
+	cat >${mntpt}/etc/fstab<<EOF
+LABEL=OLPCRoot  /               $fstype defaults,noatime        1 1
+devpts          /dev/pts        devpts  gid=5,mode=620          0 0
+tmpfs           /dev/shm        tmpfs   defaults,size=15%       0 0
+proc            /proc           proc    defaults                0 0
+sysfs           /sys            sysfs   defaults                0 0
+EOF
+
+}
+
+# @img - image name
+# @mntpt - path to mounted root directory
+grub_install()
+{
+	img="$1"
+	mntpt="$2"
+
+	mkdir -p ${mntpt}/boot/grub
+	cp /usr/lib/grub/i386-pc/stage[12] ${mntpt}/boot/grub
+	cp /usr/lib/grub/i386-pc/e2fs_stage1_5 ${mntpt}/boot/grub
+
+	cat >${mntpt}/boot/grub/menu.lst<<EOF
+default 0
+timeout 5
+color cyan/blue white/blue
+
+title		$IMG_LABEL
+root		(hd0,0)
+kernel		/bzImage root=LABEL=${IMG_LABEL} rootfstype=ext3 ro
+boot
+EOF
+
+	# grub-install is pretty broken, so we do this manually
+	geom=`parted -s "$img" "unit chs" "print" | sed -ne 's/geometry: \([0-9]\+\),\([0-9]\+\),\([0-9]\+\)/:\1 \2 \3:/p' | cut -d: -f2`
+	grub --device-map=/dev/null <<EOF
+device (hd0) $img
+geometry (hd0) $geom
+root (hd0,0)
+setup (hd0)
+EOF
+
+}
+
+# @img - image to create a filesystem on
+# @label - fs label
+# @root_dir - root directory to populate the fs with
+mk_ext3_fs()
+{
+	img="$1"
+	label="$2"
+	root_dir="$3"
+
+	# parted 1.8 added --machine for easier parsing; however,
+	# debian still has 1.7 in unstable.
+	partition_start=$(parted -s "$img" "unit B" "print" | sed -ne 's/^ 1[[:space:]]\+//p' | cut -dB -f1)
+
+	# create the filesystem
+	attach_loop "$img" "$partition_start"
+	mke2fs -q -L "$label" -m0 -j "$LOOP_DEV"
+	tune2fs -c0 -i0 "$LOOP_DEV"
+	detach_loop "$LOOP_DEV"
+
+	# populate the filesystem
+	mk_mount "$img" "ext3" "$partition_start"
+	cp -ra "$root_dir"/* "$MOUNT_POINT" || true
+	mk_fstab "$MOUNT_POINT" "ext3"
+	grub_install "$img" "$MOUNT_POINT"
+	rm_mount "$MOUNT_POINT"
+}
+
+create_jffs2_img()
+{
+	mkfs.jffs2 -n -e128KiB -r "$1" -o "${IMG_NAME}.pre"
+	sumtool -n -p -e 128KiB -i "${IMG_NAME}.pre" -o "${IMG_NAME}.jffs2"
+	rm -f "${IMG_NAME}.pre"
+	$CRCIMG < ${IMG_NAME}.jffs2 > ${IMG_NAME}.jffs2.crc
+}
+
+
+usage()
+{
+	echo "" 1>&2
+	echo "Usage: $0 [<options>] <root directory>" 1>&2
+	echo "" 1>&2
+	echo "Options:" 1>&2
+	echo "  -l <label>    Image label" 1>&2
+	echo "  -o <img>      Image (base) filename" 1>&2
+	echo "  -s <size>     Root filesystem size (in MB)" 1>&2
+	echo "" 1>&2
+	exit 1
+}
+
+check_for_cmds
+
+while test $# != 0
+do
+	case $1 in
+	-l)
+		IMG_LABEL=$2
+		shift
+		;;
+	-o)
+		IMG_NAME=$2
+		shift
+		;;
+	-s)
+		ROOT_SIZE=$2
+		shift
+		;;
+	*)
+		if [ "$#" != "1" ]; then
+			echo "Unknown option $1" 1>&2
+			usage
+		else
+			ROOT_DIR="$1"
+		fi
+		;;
+	esac
+	shift
+done
+
+if [ "$(id -u)" != "0" ]; then
+	echo "" 1>&2
+	echo "*** Error: must be run as root!" 1>&2
+	echo "" 1>&2
+	exit 2
+fi
+
+if [ "$ROOT_DIR" = "" ]; then
+	echo "" 1>&2
+	echo "*** No root directory specified!" 1>&2
+	usage
+fi
+if [ ! -d "$ROOT_DIR" ]; then
+	echo "" 1>&2
+	echo "*** Unable to find root directory!" 1>&2
+	usage
+fi
+
+mk_bootable_img "${IMG_NAME}.ext3.img" "$ROOT_SIZE"
+mk_ext3_fs "${IMG_NAME}.ext3.img" "$IMG_LABEL" "$ROOT_DIR"
+
+#mount ${IMG_NAME}.ext3 $MOUNT_POINT -o loop,offset=$OS_PART1_BEGIN -t ext3
+#cp -r "$ROOT_DIR"/* $MOUNT_POINT
+#create_jffs2_img $MOUNT_POINT
+#umount $MOUNT_POINT
-- 
2.39.2