#!/bin/sh
#
# Simple init script that should handle both
# livecd/livedisk, thinclient and hdd boot
#

PATH=/usr/sbin:/usr/bin:/sbin:/bin
INITRAMFSCONF="/etc/initramfs.conf"

ROOT_LINKS="bin sbin lib boot usr opt"
ROOT_TREES="etc root home var run"
TMPFS_DIRS="dev mnt mnt/cdrom mnt/livecd mnt/thin tmp sys proc media"
LOOPBACKFILE="/boot/pisi.sqfs"

NORESUME=0
LIVE=0
NFSROOT=0
QUIET=0
RAID_INCREMENTAL=1
RAID=0
LVM=0
COPYTORAM=0
SPLASH=0
WIPEMEM=0

HOTPLUG="/sbin/hotplug"

MNTDIR=""
FS_TYPE=""
INITRAMFS=""
ROOT_FLAGS=""
ROOT_DEVICE=""
ROOT_TARGET=""
RESUME_DEVICE=""
WIPEMEM_OPTS="-llv"

###########################
# Miscellaneous functions #
###########################

info() {
    echo "<6>initramfs: $1" > /dev/kmsg
}

log_output() {
    $@ | echo "<6>`sed 's#^\(.*\)$#initramfs:\1#g'`" > /dev/kmsg
}

fall2sh() {
    # Kill any possible plymouth instances
    test -x /bin/plymouth && /bin/plymouth quit &> /dev/null
    kill -9 $(pidof plymouthd) &> /dev/null

    echo "--> $*"
    echo "Reboot with initramfs=shell(noprobe) to further debug the issue."

    # Use a login shell for sourcing /etc/profile
    /bin/sh -l
}

run_dhcpc() {
    udhcpc -C -i eth0 -s /etc/udhcpc.script
}

##################
# Device probers #
##################

probe_devices() {
    # Set hotplug helper for firmware loading
    echo $HOTPLUG > /proc/sys/kernel/hotplug

    if [ "x$1" = "x--with-kms" ]; then
        probe_kms
        test -x /bin/plymouth && /bin/plymouth show-splash
    fi

    probe_pci_devices
    probe_virtio_devices
    probe_usb_devices

    # Unset hotplug helper
    echo > /proc/sys/kernel/hotplug

    [ "${RAID}" -eq "1" ] && probe_raid
    [ "${LVM}" -eq "1" ] && probe_lvm
}

probe_kms() {
    for device in /sys/bus/pci/devices/*/boot_vga; do
        [ -f $device ] || continue
        info "Loading KMS driver"
        grep -q 1 $device && modprobe -bq `cat ${device%boot_vga}modalias`
    done
    if [ ! -c /dev/fb0 ]; then
        echo "options uvesafb scroll=ywrap mtrr=0 nocrtc=1 mode_option=1024x768-32" > /etc/modprobe.d/uvesafb.conf
        modprobe -bq uvesafb
    fi
}

probe_pci_devices() {
    info "Probing PCI devices"
    local MODULES=""
    for module in /sys/bus/pci/devices/*/modalias; do
        [ -f $module ] || continue
        MODULES="$MODULES $(cat $module)"
    done
    modprobe -bqa $MODULES
}

probe_usb_devices() {
    info "Probing USB devices"
    local MODULES=""
    for module in /sys/bus/usb/devices/*/modalias; do
        [ -f $module ] || continue
        MODULES="$MODULES $(cat $module)"
    done
    modprobe -bqa $MODULES
}

probe_raid() {
    info "Probing RAID devices"
    modprobe -bqa dm-mod raid0 raid1 raid10 raid456
    if [ -x /sbin/mdadm ]
    then
        /sbin/mdadm --examine --scan > /etc/mdadm.conf
        /sbin/mdadm -As
    fi
}

probe_lvm() {
    info "Probing LVM devices"
    modprobe -qa dm-mod
    if [ -x /sbin/lvm ]
    then
        /sbin/lvm vgscan --ignorelockingfailure &> /dev/null
        /sbin/lvm vgchange -ay --sysinit --ignorelockingfailure &> /dev/null
        /sbin/lvm vgmknodes --ignorelockingfailure &> /dev/null
    fi
}
probe_virtio_devices() {
    local MODULES=""
    for module in /sys/bus/virtio/devices/*/modalias; do
        [ -f $module ] || continue
        MODULES="$MODULES $(cat $module)"
    done
    modprobe -bqa $MODULES
}

#################################
# Filesystem specific functions #
#################################

mount_rootfs() {
    FS_TYPE=`disktype $ROOT_DEVICE | grep KERNELMODULE | awk '{print $2}'`
    info "Mounting rootfs: $ROOT_DEVICE ($FS_TYPE)"
    mount -r -t $FS_TYPE -n ${ROOT_FLAGS} ${ROOT_DEVICE} /newroot
}

find_live_mount() {
    modprobe -bqa usb-storage udf
    if [ "$#" -gt "0" ]
    then
        for x in $*
        do
            # this is used for non Linux fs detection
            FS_TYPE=`disktype $1 | grep KERNELMODULE | awk '{print $2}'`
            if [ -n "$FS_TYPE" -a -f /lib/modules/*/$FS_TYPE.ko ]
            then
                modprobe $FS_TYPE 1> /dev/null 2>&1
            fi

            mount -r ${x} /newroot/mnt/cdrom > /dev/null 2>&1

            if [ "$?" = "0" ]
            then
                # Check for cdroot image
                if [ -e /newroot/mnt/cdrom/${LOOPBACKFILE} ]
                then
                    ROOT_DEVICE="/newroot${x}"
                    if [ "$COPYTORAM" == "1" ]
                    then
                        info "Copying Live Media files to RAM"
                        mkdir /newroot/mnt/cdromtemp
                        cp -af /newroot/mnt/cdrom/* /newroot/mnt/cdromtemp/
                        umount /newroot/mnt/cdrom
                        rmdir /newroot/mnt/cdrom
                        mv /newroot/mnt/cdromtemp /newroot/mnt/cdrom
                    fi
                    break
                else
                    umount /newroot/mnt/cdrom
                fi
            fi
        done
    fi
}

manage_tmpfs() {
    mount -t tmpfs tmpfs /newroot

    for d in ${TMPFS_DIRS}; do
        mkdir -p "/newroot/${d}"
    done
}

mount_nfs() {
    FS_LOCATION='mnt/thin'

    # Change directory to /newroot
    cd /newroot

    # FIXME: busybox mount does not load automatically
    modprobe -q nfs

    # mount nfs
    if [ -z "/etc/udhcpc.info" ]
    then
        fall2sh "/etc/udhcpc.info not found"
    fi

    . /etc/udhcpc.info

    if [ -z "${ROOTPATH}" ]
    then
        fall2sh "NFS rootpath not found"
    fi

    echo "Mounting NFS from $ROOTPATH"
    mount -o tcp,nolock,ro $ROOTPATH /newroot/mnt/thin

    if [ "$?" != '0' ]
    then
        fall2sh "Could not nfs root"
    fi

    # Create necessary links
    for x in ${ROOT_LINKS}; do
        ln -s "${FS_LOCATION}/${x}" "${x}"
    done

    if [ -e "${FS_LOCATION}/lib32" ]
    then
        ln -s "${FS_LOCATION}/lib32" "lib32"
    fi

    # We need this for x86_64
    ln -s "${FS_LOCATION}/lib" "lib64"

    chmod 1777 tmp
    (cd /newroot/${FS_LOCATION}; cp -a ${ROOT_TREES} /newroot)

    # Needed for ltspfs mechanism
    echo "$IP    $HOSTNAME" >> /newroot/etc/hosts
}

mount_cdroot() {
    FS_LOCATION="mnt/livecd"

    # Change directory to /newroot
    cd /newroot

    # These are not loaded automatically
    modprobe -q squashfs

    # Loop type squashfs
    mount -t squashfs -o loop,ro /newroot/mnt/cdrom/${LOOPBACKFILE} /newroot/mnt/livecd

    if [ "$?" != "0" ]
    then
        fall2sh "Could not mount root image"
    fi

    # Create necessary links
    for x in ${ROOT_LINKS}; do
        ln -s "${FS_LOCATION}/${x}" "${x}"
    done

    if [ -e "${FS_LOCATION}/lib32" ]
    then
        ln -s "${FS_LOCATION}/lib32" "lib32"
    fi

    # We need this for x86_64
    ln -s "${FS_LOCATION}/lib" "lib64"

    chmod 1777 tmp
    (cd /newroot/${FS_LOCATION}; cp -a ${ROOT_TREES} /newroot)

    # FIXME: the device list is taken from udev, we can't rely on sys entries since pluggable means different
    #        in kernel world. Suggestions that do not include this kind of regexp mania are welcome

    # for userspace applications
    REAL_ROOT_TYPE=`echo "${ROOT_DEVICE}" | sed -e 's/^\/newroot\/dev\///' | grep -qE '^sr[0-9]*|^hd[a-z]|^pcd[0-9]|^xvd*' && echo "optical" || echo "harddisk"`
    echo "${REAL_ROOT_TYPE}" > /newroot/run/pisilinux/livemedia

    # this is needed for yali
    MNTDIR=`grep \/mnt\/cdrom\  /proc/mounts|sed 's/\/newroot//g'`
    echo "$MNTDIR" >> /newroot/etc/fstab
}

##############################
# Config and cmdline parsers #
##############################

# FIXME: maybe we should just source the file instead of parsing
#        also consider merging conf parser and cmdline parser
parse_config() {
    while read inputline;
    do
        case "${inputline}" in
            raid=*)
                RAID=$(echo $inputline|cut -f2- -d=)
            ;;
            lvm=*)
                LVM=$(echo $inputline|cut -f2- -d=)
            ;;
            thin=*)
                NFSROOT=$(echo $inputline|cut -f2- -d=)
            ;;
            root=*)
                ROOT_TARGET=$(echo $inputline|cut -f2- -d=)
            ;;
            rootflags=*)
                ROOT_FLAGS=$(echo $inputline|cut -f2- -d=)
            ;;
            liveroot=*)
                # Installation or livecd, enable RAID by default
                # to be able to read existing RAID installations
                LIVE=1
                RAID_INCREMENTAL=0
                LIVEROOT=$(echo $inputline|cut -f2- -d=)
            ;;
            resume=*)
                RESUME_DEVICE="${inputline#resume=}"
            ;;
            noresume)
                NORESUME=1
            ;;
            copytoram)
                COPYTORAM=1
            ;;
            wipemem)
                WIPEMEM=1
            ;;
            wipememopts=*)
                WIPEMEM=1
                WIPEMEM_OPTS=$(echo $inputline|cut -f2- -d=)
            ;;
            splash)
                SPLASH=1
            ;;
            init=*)
                INIT="${inputline#INIT=}"
            ;;
        esac
    done < $INITRAMFSCONF
}

parse_cmdline() {
    for x in `cat /proc/cmdline`; do
        case "${x}" in
            [0123456Ss])
                # Normalize 'S' to 's'
                LEVEL=`echo ${x}|tr A-Z a-z`
            ;;
            mudur=*)
                for m in `echo ${x}|cut -f2 -d=|sed 's/,/ /g'`; do
                    case "${m}" in
                        livecd)
                            LIVE=1
                        ;;
                        livedisk)
                            LIVE=1
                        ;;
                        raid)
                            RAID=1
                        ;;
                        lvm)
                            LVM=1
                        ;;
                        thin)
                            NFSROOT=1
                        ;;
                    esac
                done
            ;;
            initramfs=*)
                INITRAMFS=`echo ${x}|cut -f2- -d=`
            ;;
            root=*)
                ROOT_TARGET=`echo ${x}|cut -f2- -d=`
            ;;
            rootflags=*)
                ROOT_FLAGS="-o ${x#rootflags=}"
            ;;
            liveroot=*)
                LIVE=1
                LIVEROOT=$(echo ${x}|cut -f2- -d=)
            ;;
            resume=*)
                RESUME_DEVICE="${x#resume=}"
            ;;
            noresume)
                NORESUME=1
            ;;
            init=*)
                INIT="${x#init=}"
            ;;
            copytoram)
                COPYTORAM=1
            ;;
            wipemem)
                WIPEMEM=1
            ;;
            wipememopts=*)
                WIPEMEM=1
                WIPEMEM_OPTS=$(echo $x|cut -f2- -d=)
            ;;
            splash)
                SPLASH=1
            ;;
            single)
                LEVEL="s"
            ;;
            quiet)
                QUIET=1
            ;;
            blacklist=*)
                modules=${x#blacklist=}
                for module in ${modules//,/ }; do
                    echo "blacklist $module" >> /etc/modprobe.d/cmdline.conf
                done
            ;;
        esac
    done

    if [ -f /etc/modprobe.d/cmdline.conf ]; then
        cp /etc/modprobe.d/cmdline.conf /dev/.modprobe.initramfs.conf
    fi
}


####################
# init starts here #
####################

info "Starting init on initramfs"

# Mount needed filesystems
mount -n -t proc proc /proc
mount -n -t sysfs sysfs /sys
# Added to start udev properly
#mkdir -m  0755 /run
#mount -t tmpfs tmpfs /run

# Prepare /dev (Needs kernel >= 2.6.32)
mount -t devtmpfs devtmpfs /dev
mkdir -m 0755 /dev/pts
mount -t devpts -o gid=5,mode=620 devpts /dev/pts

# First parse config file, then cmdline to allow overwriting internal config
if [ -f "$INITRAMFSCONF" ]
then
    #. $INITRAMFSCONF
    parse_config
fi

# Parse command line parameters
parse_cmdline

# Minimize printk log
test "x$QUIET" = "x1" && echo "1" > /proc/sys/kernel/printk

# Initialize plymouth daemon if found and splash is true
# Don't even launch plymouthd if we're in single-user mode
if [ "$LEVEL" != "s" -a "$SPLASH" = "1" -a -x /sbin/plymouthd ]; then
    /sbin/plymouthd --attach-to-session
fi

# Handle initramfs= parameter
if [ "${INITRAMFS}" == "shellnoprobe" ]
then
    fall2sh "Starting up a shell without probing"
elif [ "${INITRAMFS}" == "shell" ]
then
    probe_devices --with-kms
    fall2sh "Starting up a shell"
fi

if [ "${WIPEMEM}" = "1" ]
then
    info "Wiping out memory, system will be shutdown after completion"
    sdmem ${WIPEMEM_OPTS}
    poweroff -f
fi

# Probe devices
probe_devices --with-kms

if [ -x /usr/sbin/resume -a -b "$RESUME_DEVICE" -a "x$NORESUME" != "x1" ]
then
    if [ "x$SPLASH" == "x1" ]
    then
        SPLASHPARAM="-P splash=y"
    else
        SPLASHPARAM="-P splash=n"
    fi
    # FIXME: This will fail if resume= contains LABEL/UUID
    info "Attempting to resume from hibernation"
    /usr/sbin/resume $SPLASHPARAM $RESUME_DEVICE
fi

echo 0x0100 > /proc/sys/kernel/real-root-dev

if [ "${LIVE}" -eq "1" ]
then
    ROOT_DEVICE=""
    manage_tmpfs

    # modprobe filesystems that are not in kernel, for live disks
    modprobe -qa nls_cp857 nls_utf8 vfat

    for i in `seq 50`
    do
        t=`findfs ${LIVEROOT} 2>/dev/null`
        find_live_mount "$t"

        if [ "${ROOT_DEVICE}" != "" ]
        then
            break
        else
            probe_devices
            usleep 200000
        fi
    done

    if [ "${ROOT_DEVICE}" == "" ]
    then
        fall2sh "Could not find mount media"
    fi

    mount_cdroot

elif [ "${NFSROOT}" -eq "1" ]
then
    run_dhcpc
    manage_tmpfs
    mount_nfs

    # set hostname for mudur
    hostname $HOSTNAME

else
    # Wait until ROOT_DEVICE appears
    for i in `seq 50`
    do
        # let findfs handle all conversion
        ROOT_DEVICE=`findfs ${ROOT_TARGET} 2>/dev/null`

        if [ ! -b "${ROOT_DEVICE}" ]
        then
            probe_devices
            usleep 200000
        else
            break
        fi
    done
    if [ ! -b "${ROOT_DEVICE}" ]
    then
        fall2sh "Could not find boot device"
    else
        mount_rootfs
    fi
fi

[ "${INIT}" == "" ] && INIT="/sbin/init";

# This stops /lib/udev/rules.d/65-md-incremental.rules from medling with mdraid sets.
[ "${RAID_INCREMENTAL}" -eq "0" ] && touch /dev/.in_sysinit

# Move mounts instead of umount/mount
mount --move /dev /newroot/dev
mount --move /proc /newroot/proc
mount --move /sys /newroot/sys
# Added to start udev properly
#mount --move /run /newroot/run


# And we start
info "Switching to the real root"
test -x /bin/plymouth && /bin/plymouth update-root-fs --new-root-dir=/newroot
exec /bin/switch_root -c /dev/console /newroot ${INIT} ${LEVEL}