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Merge pull request #324 from ackalker/busybox-initramfs-init
initramfs init: enhancement / redesign proposal, this fixes #60 as well
This commit is contained in:
Stephan Raue
commit
3b0c4c8189
@ -21,16 +21,14 @@
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# http://www.gnu.org/copyleft/gpl.html
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################################################################################
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MODULE_DIR=/lib/modules
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UPDATE_DIR=/storage/.update
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IMAGE_SYSTEM="SYSTEM"
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IMAGE_KERNEL="KERNEL"
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REBOOT="0"
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# defaults for booting from an nbd root
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NBD_ROOT_SERVER="192.168.1.1"
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NBD_ROOT_PORT="2000"
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NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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NBD_DEVS="0"
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# mount all needed special filesystems
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/bin/busybox mount -t devtmpfs none /dev
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@ -62,22 +60,11 @@ NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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fastboot)
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FASTBOOT=yes
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;;
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netboot)
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NETBOOT=yes
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overlay)
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OVERLAY=yes
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;;
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nbdroot=*)
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nbdroot="${arg#nbdroot=}"
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NBD_ROOT_SERVER=$( echo "${nbdroot}" | /bin/busybox sed 's/:.*//')
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NBD_ROOT_PORT=$( echo "${nbdroot}" | /bin/busybox sed 's/.*://')
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;;
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nbdserver=*)
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NBD_ROOT_SERVER="${arg#nbdserver=}"
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;;
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nbdport=*)
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NBD_ROOT_PORT="${arg#nbdport=}"
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;;
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nfsoverlay=*)
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NFS_OVERLAY="${arg#nfsoverlay=}"
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break=*)
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BREAK="${arg#*=}"
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;;
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esac
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done
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@ -86,16 +73,19 @@ NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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IONICE="/bin/busybox ionice -c 1 -n 0"
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fi
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if test "$DEBUG" = "yes"; then
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exec 3>&1
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else
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exec 3>/dev/null
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fi
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SILENT_OUT=3
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progress() {
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if test "$PROGRESS" = "yes"; then
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echo "### $1 ###"
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fi
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}
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error() {
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echo "Error Code: $1 that means: $2"
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}
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debug_shell() {
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echo "### Starting debugging shell... type exit to quit ###"
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@ -105,29 +95,105 @@ NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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/bin/busybox sh </dev/tty1 >/dev/tty1 2>&1
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}
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error() {
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# Display fatal error message
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# $1:action which caused error, $2:message
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echo "*** Error in $BOOT_STEP: $1: $2 ***"
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if [ -z "$DEBUG" ]; then
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/bin/busybox halt
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else
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debug_shell
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fi
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}
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break_after() {
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# Start debug shell after boot step $1
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case $BREAK in
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all|*$1*)
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debug_shell
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;;
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esac
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}
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# Mount handlers
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# All handlers take the following parameters:
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# $1:target, $2:mountpoint, $3:mount options, [$4:fs type]
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mount_common() {
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# Common mount handler, handles block devices and filesystem images
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MOUNT_OPTIONS="-o $3"
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[ -n "$4" ] && MOUNT_OPTIONS="-t $4 $MOUNT_OPTIONS"
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for i in 1 2 3 4 5 6 7 8 9 10; do
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ERR_ENV=1
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$IONICE /bin/busybox mount $MOUNT_OPTIONS $1 $2 >&$SILENT_OUT 2>&1
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[ "$?" -eq "0" ] && ERR_ENV=0 && break
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/bin/busybox usleep 1000000
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done
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[ "$ERR_ENV" -ne "0" ] && error "mount_common" "Could not mount $1"
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}
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mount_cifs() {
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# Mount CIFS (Samba) share
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CIFS_SHARE="${1%%,*}"
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CIFS_OPTIONS="${1#*,}"
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[ "$CIFS_OPTIONS" = "$1" ] && CIFS_OPTIONS=
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mount_common "$CIFS_SHARE" "$2" "$3,$CIFS_OPTIONS" "cifs"
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}
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mount_nbd() {
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# Mount NBD device
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NBD_SERVER="${1%%:*}"
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NBD_PORT="${1#*:}"
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NBD_DEV="/dev/nbd$NBD_DEVS"
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$IONICE /bin/busybox nbd-client $NBD_SERVER $NBD_PORT $NBD_DEV >&$SILENT_OUT 2>&1 || \
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error "nbd-client" "Could not connect to NBD server $1"
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mount_common "$NBD_DEV" "$2" "$3" "$4"
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NBD_DEVS=$(( ${NBD_DEVS} + 1 ))
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}
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mount_nfs() {
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# Mount NFS export
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NFS_OPTIONS="nolock,retrans=10"
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mount_common "$1" "$2" "$3,$NFS_OPTIONS" "nfs"
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}
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mount_part() {
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# progress "check filesystem $1 ..."
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# /sbin/fsck -M -T -a $1 > /dev/null 2>&1
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# Mount a local or network filesystem
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# $1:[TYPE=]target, $2:mountpoint, $3:mount options, [$4:fs type]
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progress "mount filesystem $1 ..."
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for i in 1 2 3 4 5 6 7 8 9 10; do
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ERR_ENV=1
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MOUNT_OPTIONS="-o $3 $1 $2"
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if [ -n "$4" ]; then
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MOUNT_OPTIONS="-t $4 $MOUNT_OPTIONS"
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fi
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progress "mount filesystem $1 ..."
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$IONICE /bin/busybox mount $MOUNT_OPTIONS > /dev/null 2>&1
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[ "$?" -eq "0" ] && ERR_ENV=0 && break
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/bin/busybox usleep 1000000
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done
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[ "$ERR_ENV" -ne "0" ] && error "INIT_4" "Could not mount $1" && debug_shell
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MOUNT_TARGET="${1#*=}"
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case $1 in
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LABEL=*|UUID=*|/*)
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MOUNT_CMD="mount_common"
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MOUNT_TARGET="$1"
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;;
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CIFS=*|SMB=*)
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MOUNT_CMD="mount_cifs"
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;;
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NBD=*)
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MOUNT_CMD="mount_nbd"
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;;
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NFS=*)
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MOUNT_CMD="mount_nfs"
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;;
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*)
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error "mount_part" "Unknown filesystem $1"
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;;
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esac
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$MOUNT_CMD "$MOUNT_TARGET" "$2" "$3" "$4"
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}
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update() {
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if [ -f "$UPDATE_DIR/$2" ]; then
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if [ -f "$UPDATE_DIR/$2" -a -f "$3" ]; then
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echo "updating $1..."
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$IONICE /bin/busybox mount -o remount,rw /flash
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$IONICE /bin/busybox mv $UPDATE_DIR/$2 $3
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@ -149,88 +215,105 @@ NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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if [ "$FS_TYPE" = "\"hfs\"" -o "$FS_TYPE" = "\"hfsplus\"" ]; then
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progress "check filesystem $DEVICE [$FS_TYPE]..."
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/bin/fsck_hfs -r -y $DEVICE > /dev/null 2>&1
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/bin/fsck_hfs -r -y $DEVICE >&$SILENT_OUT 2>&1
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fi
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done
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}
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mount_nbd() {
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retry_nr=0
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retry_delay=20
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OVERLAY_DIR=`cat /sys/class/net/eth0/address | /bin/busybox tr -d :`
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load_modules() {
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progress "Loading kernel modules"
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while [ ${retry_nr} -lt ${retry_delay} ] && [ ! -e /sysroot/sbin/init ]; do
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[ ${retry_nr} -gt 0 ] && \
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$IONICE /bin/busybox nbd-client $NBD_ROOT_SERVER $NBD_ROOT_PORT /dev/nbd0 && \
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mount_part "/dev/nbd0" "/sysroot" "ro" "squashfs"
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retry_nr=$(( ${retry_nr} + 1 ))
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[ ! -e /sysroot/sbin/init ] && /bin/busybox usleep 1000000
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[ ${retry_nr} -gt 0 ]
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[ ! -f "/etc/modules" ] && return
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for module in $(cat /etc/modules); do
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progress "Loading kernel module $module"
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/bin/busybox insmod "$MODULE_DIR/$module" || \
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error "load_modules" "Failed to load kernel module $module"
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done
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if [ ! -e /sysroot/sbin/init ]; then
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error "INIT_2" "Could not mount NBD root from $NBD_ROOT_SERVER port $NBD_ROOT_PORT"
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debug_shell
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fi
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mount_part "$NFS_OVERLAY" "/sysroot/storage" "rw,nolock,retrans=10" "nfs"
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if [ ! -d /sysroot/storage/$OVERLAY_DIR ]; then
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mkdir /sysroot/storage/$OVERLAY_DIR
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fi
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/bin/busybox umount /sysroot/storage
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mount_part "$NFS_OVERLAY/$OVERLAY_DIR" "/sysroot/storage" "rw,nolock" "nfs"
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}
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mount_disk() {
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# deal with hfs partitions
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check_disks() {
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progress "Checking disks"
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if [ -x /sbin/fsck_hfs ]; then
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# deal with hfs partitions
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hfsdiskprep
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fi
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}
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mount_disks() {
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progress "Mounting disks"
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mount_part "$boot" "/flash" "ro,noatime"
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if [ -n "$disk" ]; then
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if [ -n "$OVERLAY" ]; then
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OVERLAY_DIR=`cat /sys/class/net/eth0/address | /bin/busybox tr -d :`
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mount_part "$disk" "/storage" "rw,noatime"
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mkdir -p /storage/$OVERLAY_DIR
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/bin/busybox umount /storage
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# split $disk into $target,$options so we can append $OVERLAY_DIR
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options="${disk#*,}"
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target="${disk%%,*}"
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if [ "$options" = "$disk" ]; then
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disk="$target/$OVERLAY_DIR"
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else
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disk="$target/$OVERLAY_DIR,$options"
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fi
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fi
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mount_part "$disk" "/storage" "rw,noatime"
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if [ -f "/flash/MACH_KERNEL" ]; then
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IMAGE_KERNEL="MACH_KERNEL"
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fi
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update "Kernel" "$IMAGE_KERNEL" "/flash/$IMAGE_KERNEL"
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update "System" "$IMAGE_SYSTEM" "/flash/$IMAGE_SYSTEM"
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if test "$REBOOT" -eq "1"; then
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echo "System reboots now..." && \
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/bin/busybox reboot
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fi
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fi
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}
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check_update() {
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progress "Checking for updates"
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if [ -f "/flash/MACH_KERNEL" ]; then
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IMAGE_KERNEL="MACH_KERNEL"
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fi
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update "Kernel" "$IMAGE_KERNEL" "/flash/$IMAGE_KERNEL"
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update "System" "$IMAGE_SYSTEM" "/flash/$IMAGE_SYSTEM"
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if test "$REBOOT" -eq "1"; then
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echo "System reboots now..." && \
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/bin/busybox reboot
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fi
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}
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prepare_sysroot() {
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progress "Preparing system"
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if [ -f "/flash/$IMAGE_SYSTEM" ]; then
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# /flash is filesystem with system image file
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mount_part "/flash/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
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[ "$ERR_ENV" -ne "0" ] && debug_shell
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/bin/busybox mount --move /flash /sysroot/flash
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else
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error "INIT_2" "Could not find system."
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debug_shell
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# /flash is actual root filesystem
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/bin/busybox mount --move /flash /sysroot
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fi
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# move /flash and /storage to /sysroot
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/bin/busybox mount --move /flash /sysroot/flash
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if [ -n "$disk" ]; then
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/bin/busybox mount --move /storage /sysroot/storage
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fi
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[ -f "/sysroot/sbin/init" ] || error "final_check" "Could not find system."
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}
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if [ -z "$NETBOOT" ]; then
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mount_disk
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else
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mount_nbd
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fi
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# main boot sequence
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for BOOT_STEP in \
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load_modules \
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check_disks \
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mount_disks \
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check_update \
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prepare_sysroot; do
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$BOOT_STEP
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[ -n "$DEBUG" ] && break_after $BOOT_STEP
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done
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BOOT_STEP=final
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# move some special filesystems
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/bin/busybox mount --move /dev /sysroot/dev
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@ -240,5 +323,4 @@ NFS_OVERLAY="192.168.1.1:/var/lib/overlay"
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# switch to new sysroot and start real init
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exec /bin/busybox switch_root /sysroot /sbin/init
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error "INIT_3" "Error in initramfs. Could not switch to new root"
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debug_shell
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error "switch_root" "Error in initramfs. Could not switch to new root"
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