initial commit

create.sh

@@ -0,0 +1,119 @@
+#!/bin/sh
+
+# the problem with this approach is: while it allows to multiboot a kernel and
+# initrd, it will pick the rootfs from the first partition always
+
+set -e
+
+mkdir -p isomount
+mkdir -p extmount
+mkdir -p mainmount
+
+cleanup() {
+	sudo umount isomount
+	sudo umount extmount
+	sudo umount mainmount
+}
+
+trap cleanup 1 2 15
+
+PATH=$PATH:/sbin:/usr/sbin
+TMP=.
+
+bs=512
+
+# the size of the first partition
+mainsize=1024
+
+echo " ++ creating main partition"
+
+main="$TMP"/main
+fallocate -l $((mainsize*bs)) "$main"
+mke2fs -F "$main" > /dev/null 2>&1
+sudo mount "$main" mainmount > /dev/null 2>&1
+sudo mkdir mainmount/extlinux
+sudo extlinux --install mainmount/extlinux > /dev/null 2>&1
+sudo cp /usr/lib/syslinux/chain.c32 /usr/lib/syslinux/menu.c32 mainmount/extlinux
+echo "UI menu.c32" | sudo tee mainmount/extlinux/extlinux.conf > /dev/null 2>&1
+
+# the first partition to boot from is the first logical one
+count=5
+
+sum=0
+# first we check how much space each iso content needs in an ext2 filesystem
+for iso in *.iso; do
+	echo " ++ processing $iso"
+	b="$TMP"/`basename "$iso" .iso`.ext2
+	# get the size of the iso
+	size=`stat -c %s "$iso"`
+	# create an image of that size +20% for safety margin
+	size10=$(((size*120)/100))
+	fallocate -l $size10 "$b"
+	mke2fs -F "$b" > /dev/null 2>&1
+	#fuse-ext2 -o rw+ "$b" extmount
+	#fuse-ext2 -v -o rw,force "$b" extmount -o debug > log 2>&1 &
+	sudo mount "$b" extmount
+	#fuseiso "$iso" isomount
+	sudo mount "$iso" isomount > /dev/null 2>&1
+	sudo cp -r isomount/. extmount
+	sudo mv extmount/isolinux extmount/extlinux
+	sudo mv extmount/extlinux/isolinux.cfg extmount/extlinux/extlinux.conf
+	sudo extlinux --install extmount/extlinux > /dev/null 2>&1
+	sudo cp /usr/lib/syslinux/chain.c32 /usr/lib/syslinux/menu.c32 extmount/extlinux
+	#fusermount -u extmount
+	sudo umount extmount
+	#fusermount -u isomount
+	sudo umount isomount
+	e2fsck -yf "$b" > /dev/null 2>&1
+	resize2fs -M "$b" > /dev/null 2>&1
+	newsize=`stat -c %s "$b"`
+	sectorcount=$((newsize/bs+3))
+	sum=$((sum+sectorcount*bs))
+	sudo tee -a mainmount/extlinux/extlinux.conf > /dev/null << EOF
+LABEL $count
+	MENU LABEL $iso
+	COM32 chain.c32
+	APPEND hd0 $count
+EOF
+	count=$((count+1))
+done
+
+sudo umount mainmount
+
+echo " ++ creating disk image"
+
+# create the final image
+root="$TMP"/root.img
+fallocate -l $((sum+bs*(mainsize+2))) "$root"
+
+# create the initial disk layout
+parted -s -- "$root" mklabel msdos > /dev/null 2>&1
+parted -s -- "$root" mkpart primary ext2 1s ${mainsize}s > /dev/null 2>&1
+parted -s -- "$root" set 1 boot on > /dev/null 2>&1
+parted -s -- "$root" mkpart extended $((mainsize+1))s -1s > /dev/null 2>&1
+
+dd if="$main" of="$root" obs=$bs seek=1 conv=notrunc > /dev/null 2>&1
+rm "$main"
+
+# create partitions for all isos
+start=$((mainsize+2))
+for ext2 in "$TMP"/*.ext2; do
+	echo " ++ filling with $ext2"
+	size=`stat -c %s "$ext2"`
+	ssize=$((size/bs+1))
+	parted -s -- "$root" mkpart logical ext2 ${start}s $((start+ssize))s > /dev/null 2>&1
+	# copy ext2 fs to newly created partition
+	offset=`/sbin/parted -m "$root" unit s print | tail -1 | sed 's/^[0-9]\+:\([^:s]\+\)s:.*/\1/'`
+	dd if="$ext2" of="$root" obs=$bs seek=$offset conv=notrunc > /dev/null 2>&1
+	rm "$ext2"
+	start=$((start+ssize+2))
+done
+
+# make the whole thing bootable
+dd conv=notrunc bs=440 count=1 if=/usr/lib/extlinux/mbr.bin of="$root" > /dev/null 2>&1
+
+rm -df extmount
+rm -df isomount
+rm -df mainmount
+
+echo " ++ success! The result is stored in $root"