Wrote documentation and scripts for creating a busybox boot floppy. Initial revision.

examples/bootfloppy/mkrootfs.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+#
+# mkrootfs.sh - creates a root file system
+#
+
+# TODO: need to add checks here to verify that busybox, uClibc and bzImage
+# exist
+
+
+# command-line settable variables
+BUSYBOX_DIR=..
+UCLIBC_DIR=../../uClibc
+TARGET_DIR=./loop
+FSSIZE=4000
+CLEANUP=1
+MKFS='mkfs.ext2 -F'
+
+# don't-touch variables
+BASE_DIR=`pwd`
+
+
+while getopts 'b:u:s:t:Cm' opt
+do
+	case $opt in
+		b) BUSYBOX_DIR=$OPTARG ;;
+		u) UCLIBC_DIR=$OPTARG ;;
+		t) TARGET_DIR=$OPTARG ;;
+		s) FSSIZE=$OPTARG ;;
+		C) CLEANUP=0 ;;
+		m) MKFS='mkfs.minix' ;;
+		*)
+			echo "usage: `basename $0` [-bu]"
+			echo "  -b DIR  path to busybox direcory (default ..)"
+			echo "  -u DIR  path to uClibc direcory (default ../../uClibc)"
+			echo "  -t DIR  path to target direcory (default ./loop)"
+			echo "  -s SIZE size of root filesystem in Kbytes (default 4000)"
+			echo "  -C      don't perform cleanup (umount target dir, gzip rootfs, etc.)"
+			echo "          (this allows you to 'chroot loop/ /bin/sh' to test it)"
+			echo "  -m      use minix filesystem (default is ext2)"
+			exit 1
+			;;
+	esac
+done
+
+
+
+
+# clean up from any previous work
+mount | grep -q loop
+[ $? -eq 0 ] && umount $TARGET_DIR
+[ -d $TARGET_DIR ] && rm -rf $TARGET_DIR/
+[ -f rootfs ] && rm -f rootfs
+[ -f rootfs.gz ] && rm -f rootfs.gz
+
+
+# prepare root file system and mount as loopback
+dd if=/dev/zero of=rootfs bs=1k count=$FSSIZE
+$MKFS -i 2000 rootfs
+mkdir $TARGET_DIR
+mount -o loop,exec rootfs $TARGET_DIR # must be root
+
+
+# install uClibc
+mkdir -p $TARGET_DIR/lib
+cd $UCLIBC_DIR
+make INSTALL_DIR= 
+cp -a libc.so* $BASE_DIR/$TARGET_DIR/lib
+cp -a uClibc*.so $BASE_DIR/$TARGET_DIR/lib
+cp -a ld.so-1/d-link/ld-linux-uclibc.so* $BASE_DIR/$TARGET_DIR/lib 
+cp -a ld.so-1/libdl/libdl.so* $BASE_DIR/$TARGET_DIR/lib
+cp -a crypt/libcrypt.so* $BASE_DIR/$TARGET_DIR/lib
+cd $BASE_DIR
+
+
+# install busybox and components
+cd $BUSYBOX_DIR
+make distclean
+make CC=$BASE_DIR/$UCLIBC_DIR/extra/gcc-uClibc/i386-uclibc-gcc
+make PREFIX=bootfloppy/loop install
+cd $BASE_DIR
+
+
+# make files in /dev
+mkdir $TARGET_DIR/dev
+./mkdevs.sh $TARGET_DIR/dev
+
+
+# make files in /etc
+cp -a etc $TARGET_DIR
+ln -s /proc/mounts $TARGET_DIR/etc/mtab
+
+
+# other miscellaneous setup
+mkdir $TARGET_DIR/initrd
+mkdir $TARGET_DIR/proc
+$UCLIBC_DIR/ld.so-1/util/ldconfig -r $TARGET_DIR
+
+
+# Done. Maybe do cleanup.
+if [ $CLEANUP -eq 1 ]
+then
+	umount $TARGET_DIR
+	rmdir $TARGET_DIR
+	gzip -9 rootfs
+fi
+