initial commit

1 files changed, 308 insertions, 0 deletions

diff --git a/initramfs-init b/initramfs-init
new file mode 100755
index 0000000..d9a9d68
--- /dev/null
+++ b/initramfs-init
@@ -0,0 +1,308 @@
+#!/bin/busybox sh
+
+# this is the init script version
+VERSION=1.1
+NEWROOT=/newroot
+SINGLEMODE=no
+
+/bin/busybox --install -s
+
+# basic environment
+export PATH=/usr/bin:/bin:/usr/sbin:/sbin
+
+# needed devs
+[ -c /dev/null ] || mknod -m 666 /dev/null c 1 3
+
+# basic mounts
+mount -t proc -o noexec,nosuid,nodev proc /proc
+mount -t sysfs -o noexec,nosuid,nodev sysfs /sys
+
+# some helpers
+ebegin() {
+	echo -n " * $*: "
+}
+eend() {
+	local msg
+	if [ "$1" = 0 ] || [ $# -lt 1 ] ; then
+		echo "ok."
+	else
+		shift
+		echo "failed. $*"
+		echo "initramfs emergency recovery shell launched. Type 'exit' to continue boot"
+		/bin/busybox sh
+	fi
+}
+
+scan_drivers() {
+	if [ "$AUTODETECT" != no ] ; then
+		find /sys -name modalias | xargs sort -u | xargs modprobe -a 2> /dev/null
+	fi
+}
+
+find_ovl() {
+	local mnt="$1"
+	local ovl
+	local lines
+
+	# look for apkovl's on mounted media
+	ovl=$( ls -1 "$mnt"/*.apkovl.tar.gz* 2>/dev/null ) || return 1
+	lines=$(echo "$ovl" | wc -l)
+
+	if [ $lines -gt 1 ] ; then
+		echo "ERROR: More than one apkovl file was found on $(basename $mnt). None will be read." >&2
+		return 1
+	fi
+	echo "$ovl"
+}
+
+retry_mount() {
+	# usb might need some time to settle so we retry a few times
+	for i in $(seq 0 19); do
+		mount $@ 2>&1 && return 0
+		sleep 1
+	done
+	return 1
+}
+
+unpack_apkovl() {
+	local ovl="$1"
+	local dest="$2"
+	local suffix=${ovl##*.}
+	local i
+	if [ "$suffix" = "gz" ]; then
+		tar -C "$dest" -zxf "$ovl"
+		return $?
+	fi
+
+	for i in $ALPINE_MNT/*/*/openssl-[0-9]*.apk $ALPINE_MNT/*/openssl-[0-9]*.apk; do
+		[ -f "$i" ] && tar --numeric-owner -C / -zxf $i && break
+	done
+
+	if ! openssl list-cipher-commands | grep "^$suffix$" > /dev/null; then
+		errstr="Cipher $suffix is not supported"
+		return 1
+	fi
+	local count=0
+	# beep
+	echo -e "\007"
+	while [ $count -lt 3 ]; do
+		openssl enc -d -$suffix -in "$ovl" | tar --numeric-owner \
+			-C "$dest" -zx 2>/dev/null && return 0
+		count=$(( $count + 1 ))
+	done
+	return 1
+}
+
+# gotta start from somewhere :)
+echo "Alpine Init $VERSION"
+
+# read the kernel options
+for i in `cat /proc/cmdline` ; do
+	case $i in
+		s|single|1)
+			SINGLEMODE=yes ;;
+		modules=*)
+			MODULES="`echo ${i#modules=} | tr ',' ' '`";;
+		noautodetect)
+			AUTODETECT=no;;
+		*=*)    eval KOPT_$i ;;
+		*)      eval KOPT_$i=yes ;;
+	esac
+done
+
+# start bootcharting if wanted
+if [ -n "$KOPT_chart" ]; then
+	ebegin "Starting bootchart logging"
+	/sbin/bootchartd start-initfs "$NEWROOT"
+	eend 0
+fi
+
+ALPINE_DEV=${KOPT_alpine_dev%%:*}
+ALPINE_DEV_FS=${KOPT_alpine_dev##*:}
+if [ "$ALPINE_DEV_FS" = "$ALPINE_DEV" ]; then
+	unset ALPINE_DEV_FS
+fi
+ALPINE_MNT=/media/$ALPINE_DEV
+
+# hide kernel messages
+dmesg -n 1
+
+# setup /dev
+ebegin "Starting mdev"
+mount -t tmpfs -o exec,nosuid,mode=0755 mdev /dev
+ln -s sr0 /dev/cdrom
+echo "/sbin/mdev" > /proc/sys/kernel/hotplug
+mdev -s
+RC=$?
+[ -d /dev/pts ] || mkdir -m 755 /dev/pts
+[ -c /dev/ptmx ] || mknod -m 666 /dev/ptmx c 5 2
+mount -t devpts -o gid=5,mode=0620,noexec,nosuid devpts /dev/pts
+[ -d /dev/shm ] || mkdir /dev/shm
+mount -t tmpfs -o nodev,nosuid,noexec shm /dev/shm
+eend $RC
+
+# load available drivers to get access to modloop media
+ebegin "Loading boot drivers"
+[ "$MODULES" ] && modprobe -a $MODULES 2> /dev/null
+if [ -f /etc/modules ] ; then
+	sed 's/\#.*//g' < /etc/modules |
+	while read module args; do
+		modprobe -q $module $args
+	done
+fi
+scan_drivers
+scan_drivers
+eend 0
+
+# check if root=... was set
+if [ -n "$KOPT_root" ]; then
+	if [ "$SINGLEMODE" = "yes" ]; then
+		echo "Entering single mode. Type 'exit' to continue booting."
+		sh
+	fi
+	case "$KOPT_root" in
+		/dev/md*) 
+			mknod $KOPT_root b 9 ${KOPT_root#/dev/md}
+			raidautorun "$KOPT_root"
+			;;
+	esac
+	ebegin "Mounting root"
+	retry_mount $KOPT_root $NEWROOT 2>/dev/null
+	eend $?
+	cat /proc/mounts | while read DEV DIR TYPE OPTS ; do
+		if [ "$DIR" != "/" -a "$DIR" != "$NEWROOT" -a -d "$DIR" ]; then
+			mkdir -p $NEWROOT/$DIR
+			mount -o move $DIR $NEWROOT/$DIR
+		fi
+	done
+	sync
+	exec /bin/busybox switch_root $NEWROOT $chart_init /sbin/init $KOPT_init_args
+	echo "initramfs emergency recovery shell launched"
+	exec /bin/busybox sh
+fi
+
+# locate boot media and mount it
+ebegin "Mounting boot media"
+mkdir -p $ALPINE_MNT
+if [ -n "$ALPINE_DEV_FS" ]; then
+	mount_opts="-t $ALPINE_DEV_FS"
+fi
+
+retry_mount $mount_opts /dev/$ALPINE_DEV $ALPINE_MNT >/dev/null 2>&1
+eend $?
+
+ebegin "Mounting loopback device for kernel modules"
+modprobe loop
+if [ -n "$KOPT_modloop" ]; then
+	modloop=$KOPT_modloop
+else
+	modloop=$KOPT_BOOT_IMAGE.cmg
+fi
+mount -o loop,ro -t cramfs $ALPINE_MNT/$modloop /.modloop
+rc=$?
+if [ "$rc" = 0 ]; then
+	rm -rf /lib/modules
+	ln -sf /.modloop/modules /lib
+fi
+eend $?
+
+if [ -d $ALPINE_MNT/firmware ]; then
+	ebegin "Copying firmware from $ALPINE_MNT/firmware"
+	mkdir -p /lib
+	cp -R -a $ALPINE_MNT/firmware /lib/
+	eend $?
+fi
+
+mkdir -p /etc/apk
+for i in $ALPINE_MNT/*/APK_INDEX.gz $ALPINE_MNT/*/*/APK_INDEX.gz; do
+	[ -r "$i" ] && echo ${i%/APK_INDEX.gz} >> /etc/apk/repositories
+done
+
+# early console?
+if [ "$SINGLEMODE" = "yes" ]; then
+	echo "Entering single mode. Type 'exit' to continue booting."
+	sh
+fi
+
+# more drivers
+ebegin "Loading hardware drivers"
+scan_drivers
+eend 0
+
+mount -t tmpfs tmpfs $NEWROOT
+
+# look for apkovl
+if dmesg | grep '^usb-storage: waiting' >/dev/null; then
+	ebegin "Waiting for USB device to settle"
+	while ! dmesg | grep 'usb-storage: device scan complete' >/dev/null; do
+		sleep 1
+	done
+	eend 0
+fi
+for i in usb floppy cdrom; do
+	mount /media/$i 2>/dev/null || continue
+	ovl=$(find_ovl /media/$i)
+	[ -f "$ovl" ] && break
+	umount /media/$i 2>/dev/null
+done
+if ! [ -f "$ovl" ]; then
+	ovl=$(find_ovl $ALPINE_MNT)
+fi
+
+if [ -f "$ovl" ]; then
+	ebegin "Loading user settings from $ovl"
+	unpack_apkovl "$ovl" $NEWROOT
+	eend $? $errstr
+	umount /media/$i 2>/dev/null &
+	pkgs=$(sed 's/\#.*//' $NEWROOT/etc/lbu/packages.list 2>/dev/null)
+fi
+
+# hack so we get openrc
+pkgs="$pkgs openrc"
+
+# install new root
+ebegin "Installing packages to root filesystem"
+if [ -n "$KOPT_chart" ]; then
+	pkgs="$pkgs acct"
+fi
+apkflags="--initdb --quiet --progress --force"
+if [ -z "$KOPT_keep_apk_new" ]; then
+	apkflags="$apkflags --clean-protected"
+fi
+apk add --root /newroot $apkflags $pkgs >/dev/null
+eend $?
+
+# copy alpine release info
+cp $ALPINE_MNT/.alpine-release $NEWROOT/
+ln -sf /.alpine-release $NEWROOT/etc/alpine-release
+
+# if there is no repositories file, then use the default
+if ! [ -f $NEWROOT/etc/apk/repositories ]; then
+	cp /etc/apk/repositories $NEWROOT/etc/apk/repositories
+fi
+
+# setup bootchart for switch_root
+chart_init=""
+if [ -n "$KOPT_chart" ]; then
+	/sbin/bootchartd stop-initfs "$NEWROOT"
+	chart_init="/sbin/bootchartd start-rootfs"
+fi
+
+# switch over to new root
+cat /proc/mounts | while read DEV DIR TYPE OPTS ; do
+	if [ "$DIR" != "/" -a "$DIR" != "$NEWROOT" -a -d "$DIR" ]; then
+		mkdir -p $NEWROOT/$DIR
+		mount -o move $DIR $NEWROOT/$DIR
+	fi
+done
+ln -sf /.modloop/modules $NEWROOT/lib/modules
+sync
+
+echo ""
+if [ -x $NEWROOT/sbin/init ]; then
+	exec /bin/busybox switch_root $NEWROOT $chart_init /sbin/init $KOPT_init_args
+fi
+
+echo "initramfs emergency recovery shell launched"
+exec /bin/busybox sh
+reboot