Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/share/initramfs-tools/init

Text File | 2008-08-13 | 4KB | 233 lines

#!/bin/sh

echo "Loading, please wait..."

[ -d /dev ] || mkdir -m 0755 /dev
[ -d /root ] || mkdir -m 0700 /root
[ -d /sys ] || mkdir /sys
[ -d /proc ] || mkdir /proc
[ -d /tmp ] || mkdir /tmp
mkdir -p /var/lock
mount -t sysfs -o nodev,noexec,nosuid none /sys
mount -t proc -o nodev,noexec,nosuid none /proc

# Note that this only becomes /dev on the real filesystem if udev's scripts
# are used; which they will be, but it's worth pointing out
mount -t tmpfs -o mode=0755 udev /dev
[ -e /dev/console ] || mknod -m 0600 /dev/console c 5 1
[ -e /dev/null ] || mknod /dev/null c 1 3
> /dev/.initramfs-tools
mkdir /dev/.initramfs

# Export the dpkg architecture
export DPKG_ARCH=
. /conf/arch.conf

# Set modprobe env
export MODPROBE_OPTIONS="-Qb"

# Export relevant variables
export ROOT=
export ROOTDELAY=
export ROOTFLAGS=
export ROOTFSTYPE=
export break=
export init=/sbin/init
export quiet=n
export readonly=y
export rootmnt=/root
export debug=
export panic=
export blacklist=
export resume_offset=

# Bring in the main config
. /conf/initramfs.conf
for conf in conf/conf.d/*; do
    [ -f ${conf} ] && . ${conf}
done
. /scripts/functions

# Parse command line options
for x in $(cat /proc/cmdline); do
    case $x in
    init=*)
        init=${x#init=}
        ;;
    root=*)
        ROOT=${x#root=}
        case $ROOT in
        LABEL=*)
            ROOT="/dev/disk/by-label/${ROOT#LABEL=}"
            ;;
        UUID=*)
            ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
            ;;
        /dev/nfs)
            [ -z "${BOOT}" ] && BOOT=nfs
            ;;
        esac
        ;;
    rootflags=*)
        ROOTFLAGS="-o ${x#rootflags=}"
        ;;
    rootfstype=*)
        ROOTFSTYPE="${x#rootfstype=}"
        ;;
    rootdelay=*)
        ROOTDELAY="${x#rootdelay=}"
        case ${ROOTDELAY} in
        *[![:digit:].]*)
            ROOTDELAY=
            ;;
        esac
        ;;
    resumedelay=*)
        RESUMEDELAY="${x#resumedelay=}"
        ;;
    loop=*)
        LOOP="${x#loop=}"
        ;;
    loopflags=*)
        LOOPFLAGS="-o ${x#loopflags=}"
        ;;
    loopfstype=*)
        LOOPFSTYPE="${x#loopfstype=}"
        ;;
    cryptopts=*)
        cryptopts="${x#cryptopts=}"
        ;;
    nfsroot=*)
        NFSROOT="${x#nfsroot=}"
        ;;
    netboot=*)
        NETBOOT="${x#netboot=}"
        ;;
    ip=*)
        IPOPTS="${x#ip=}"
        ;;
    boot=*)
        BOOT=${x#boot=}
        ;;
    resume=*)
        RESUME="${x#resume=}"
        ;;
    resume_offset=*)
        resume_offset="${x#resume_offset=}"
        ;;
    noresume)
        noresume=y
        ;;
    panic=*)
        panic="${x#panic=}"
        case ${panic} in
        *[![:digit:].]*)
            panic=
            ;;
        esac
        ;;
    quiet)
        quiet=y
        ;;
    ro)
        readonly=y
        ;;
    rw)
        readonly=n
        ;;
    debug)
        debug=y
        quiet=n
        exec >/tmp/initramfs.debug 2>&1
        set -x
        ;;
    debug=*)
        debug=y
        quiet=n
        set -x
        ;;
    break=*)
        break=${x#break=}
        ;;
    break)
        break=premount
        ;;
    blacklist=*)
        blacklist=${x#blacklist=}
        ;;
    esac
done

if [ -z "${noresume}" ]; then
    export resume=${RESUME}
else
    export noresume
fi

depmod -a
maybe_break top

# export BOOT variable value for compcache,
# so we know if we run from casper
export BOOT

# Don't do log messages here to avoid confusing usplash
run_scripts /scripts/init-top

maybe_break modules
log_begin_msg "Loading essential drivers..."
load_modules
log_end_msg

maybe_break premount
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-premount"
run_scripts /scripts/init-premount
[ "$quiet" != "y" ] && log_end_msg

maybe_break mount
log_begin_msg "Mounting root file system..."
. /scripts/${BOOT}
parse_numeric ${ROOT}
mountroot
log_end_msg

maybe_break bottom
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-bottom"
run_scripts /scripts/init-bottom
[ "$quiet" != "y" ] && log_end_msg

# Move virtual filesystems over to the real filesystem
mount -n -o move /sys ${rootmnt}/sys
mount -n -o move /proc ${rootmnt}/proc

# Check init bootarg
if [ -n "${init}" ] && [ ! -x "${rootmnt}${init}" ]; then
    echo "Target filesystem doesn't have ${init}."
    init=
fi

# Search for valid init
if [ -z "${init}" ] ; then
    for init in /sbin/init /etc/init /bin/init /bin/sh; do
        if [ ! -x "${rootmnt}${init}" ]; then
            continue
        fi
        break
    done
fi

# No init on rootmount
if [ ! -x "${rootmnt}${init}" ]; then
    panic "No init found. Try passing init= bootarg."
fi

# Confuses /etc/init.d/rc
if [ -n ${debug} ]; then
    unset debug
fi

# Chain to real filesystem
maybe_break init
exec run-init ${rootmnt} ${init} "$@" <${rootmnt}/dev/console >${rootmnt}/dev/console 2>&1
panic "Could not execute run-init."