void-packages/srcpkgs/initramfs-tools/files/init

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#!/bin/busybox sh
echo "Starting up the initramfs, please wait..."
BUSYBOX_LINKS="
[ [[ ash awk basename cat chgrp chmod chown chroot clear cmp comm cp \
cut date dd deallocvt df dirname dmesg dnsdomainname du echo \
egrep env expand expr false fgrep find fsync fuser grep head hexdump hostname \
id install kbd_mode kill killall killall5 ln loadfont losetup ls lsmod \
mkdir mkfifo mknod mktemp more mount mv pgrep pidof pivot_root pkill \
printenv printf ps pwd readlink realpath rm rmdir sed seq sh sleep sort \
split stat stty sum switch_root sync tac tail tee test top touch tr true tty \
umount uname uniq vi wc xargs yes"
# Create required busybox symlinks
for f in $BUSYBOX_LINKS; do
/bin/busybox ln -s /bin/busybox /bin/${f}
done
[ -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 sysfs /sys
mount -t proc -o nodev,noexec,nosuid proc /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
tmpfs_size="10M"
if [ -e /etc/udev/udev.conf ]; then
. /etc/udev/udev.conf
fi
mount -t tmpfs -o size=$tmpfs_size,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 IP=
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 $ROOT in
LABEL=*)
ROOT="${ROOT#LABEL=}"
# support any / in LABEL= path (escape to \x2f)
case "${ROOT}" in
*[/]*)
if [ -x "$(command -v sed)" ]; then
ROOT="$(echo ${ROOT} | sed 's,/,\\x2f,g')"
else
if [ "${ROOT}" != "${ROOT#/}" ]; then
ROOT="\x2f${ROOT#/}"
fi
if [ "${ROOT}" != "${ROOT%/}" ]; then
ROOT="${ROOT%/}\x2f"
fi
IFS='/'
newroot=
for s in $ROOT; do
if [ -z "${newroot}" ]; then
newroot="${s}"
else
newroot="${newroot}\\x2f${s}"
fi
done
unset IFS
ROOT="${newroot}"
fi
esac
ROOT="/dev/disk/by-label/${ROOT}"
;;
UUID=*)
ROOT="/dev/disk/by-uuid/${ROOT#UUID=}"
;;
/dev/nfs)
[ -z "${BOOT}" ] && BOOT=nfs
;;
esac
;;
rootflags=*)
ROOTFLAGS="-o ${x#rootflags=}"
;;
rootfstype=*)
ROOTFSTYPE="${x#rootfstype=}"
;;
rootdelay=*)
ROOTDELAY="${x#rootdelay=}"
case ${ROOTDELAY} in
*[![:digit:].]*)
ROOTDELAY=
;;
esac
;;
nfsroot=*)
NFSROOT="${x#nfsroot=}"
;;
ip=*)
IP="${x#ip=}"
;;
boot=*)
BOOT=${x#boot=}
;;
resume=*)
RESUME="${x#resume=}"
;;
resume_offset=*)
resume_offset="${x#resume_offset=}"
;;
noresume)
noresume=y
;;
panic=*)
panic="${x#panic=}"
case ${panic} in
*[![:digit:].]*)
panic=
;;
esac
;;
quiet)
quiet=y
;;
ro)
readonly=y
;;
rw)
readonly=n
;;
debug)
debug=y
quiet=n
exec >/dev/.initramfs/initramfs.debug 2>&1
set -x
;;
debug=*)
debug=y
quiet=n
set -x
;;
break=*)
break=${x#break=}
;;
break)
break=premount
;;
blacklist=*)
blacklist=${x#blacklist=}
;;
esac
done
if [ -z "${noresume}" ]; then
export resume=${RESUME}
else
export noresume
fi
depmod -a
maybe_break top
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-top"
run_scripts /scripts/init-top
[ "$quiet" != "y" ] && log_end_msg
maybe_break modules
[ "$quiet" != "y" ] && log_begin_msg "Loading essential drivers"
load_modules
[ "$quiet" != "y" ] && log_end_msg
maybe_break premount
[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-premount"
run_scripts /scripts/init-premount
[ "$quiet" != "y" ] && log_end_msg
maybe_break mount
[ "$quiet" != "y" ] && log_begin_msg "Mounting root file system"
. /scripts/${BOOT}
parse_numeric ${ROOT}
maybe_break mountroot
mountroot
[ "$quiet" != "y" ] && 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
maybe_break init
# don't leak too much of env - some init(8) don't clear it
# (keep init, rootmnt)
unset debug
unset MODPROBE_OPTIONS
unset DPKG_ARCH
unset ROOTFLAGS
unset ROOTFSTYPE
unset ROOTDELAY
unset ROOT
unset IP
unset blacklist
unset break
unset noresume
unset panic
unset quiet
unset readonly
unset resume
unset resume_offset
# Chain to real filesystem
exec switch_root ${rootmnt} ${init} "$@"
panic "Could not execute run-init."