diff options
Diffstat (limited to 'init')
| -rwxr-xr-x | init | 333 |
1 files changed, 333 insertions, 0 deletions
@@ -0,0 +1,333 @@ +#!/bin/sh + +# Default PATH differs between shells, and is not automatically exported +# by klibc dash. Make it consistent. +export PATH=/sbin:/usr/sbin:/bin:/usr/bin + +[ -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 + +# shellcheck disable=SC2013 +for x in $(cat /proc/cmdline); do + case $x in + initramfs.clear) + clear + ;; + quiet) + quiet=y + ;; + esac +done + +if [ "$quiet" != "y" ]; then + quiet=n + echo "Loading, please wait..." +fi +export quiet + +# 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 devtmpfs -o nosuid,mode=0755 udev /dev + +# Prepare the /dev directory +[ ! -h /dev/fd ] && ln -s /proc/self/fd /dev/fd +[ ! -h /dev/stdin ] && ln -s /proc/self/fd/0 /dev/stdin +[ ! -h /dev/stdout ] && ln -s /proc/self/fd/1 /dev/stdout +[ ! -h /dev/stderr ] && ln -s /proc/self/fd/2 /dev/stderr + +mkdir /dev/pts +mount -t devpts -o noexec,nosuid,gid=5,mode=0620 devpts /dev/pts || true + +# 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 DEVICE= +export BOOT= +export BOOTIF= +export UBIMTD= +export break= +export init=/sbin/init +export readonly=y +export rootmnt=/root +export debug= +export panic= +export blacklist= +export resume= +export resume_offset= +export noresume= +export drop_caps= +export fastboot=n +export forcefsck=n +export fsckfix= + + +# 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 +# shellcheck disable=SC2013 +for x in $(cat /proc/cmdline); do + case $x in + init=*) + init=${x#init=} + ;; + root=*) + ROOT=${x#root=} + if [ -z "${BOOT}" ] && [ "$ROOT" = "/dev/nfs" ]; then + BOOT=nfs + fi + ;; + rootflags=*) + ROOTFLAGS="-o ${x#rootflags=}" + ;; + rootfstype=*) + ROOTFSTYPE="${x#rootfstype=}" + ;; + rootdelay=*) + ROOTDELAY="${x#rootdelay=}" + case ${ROOTDELAY} in + *[![:digit:].]*) + ROOTDELAY= + ;; + esac + ;; + nfsroot=*) + # shellcheck disable=SC2034 + NFSROOT="${x#nfsroot=}" + ;; + initramfs.runsize=*) + RUNSIZE="${x#initramfs.runsize=}" + ;; + ip=*) + IP="${x#ip=}" + ;; + boot=*) + BOOT=${x#boot=} + ;; + ubi.mtd=*) + UBIMTD=${x#ubi.mtd=} + ;; + resume=*) + RESUME="${x#resume=}" + ;; + resume_offset=*) + resume_offset="${x#resume_offset=}" + ;; + noresume) + noresume=y + ;; + drop_capabilities=*) + drop_caps="-d ${x#drop_capabilities=}" + ;; + panic=*) + panic="${x#panic=}" + ;; + ro) + readonly=y + ;; + rw) + readonly=n + ;; + debug) + debug=y + quiet=n + if [ -n "${netconsole}" ]; then + log_output=/dev/kmsg + else + log_output=/run/initramfs/initramfs.debug + fi + set -x + ;; + debug=*) + debug=y + quiet=n + set -x + ;; + break=*) + break=${x#break=} + ;; + break) + break=premount + ;; + blacklist=*) + blacklist=${x#blacklist=} + ;; + netconsole=*) + netconsole=${x#netconsole=} + [ "$debug" = "y" ] && log_output=/dev/kmsg + ;; + BOOTIF=*) + BOOTIF=${x#BOOTIF=} + ;; + fastboot|fsck.mode=skip) + fastboot=y + ;; + forcefsck|fsck.mode=force) + forcefsck=y + ;; + fsckfix|fsck.repair=yes) + fsckfix=y + ;; + fsck.repair=no) + fsckfix=n + ;; + esac +done + +# Default to BOOT=local if no boot script defined. +if [ -z "${BOOT}" ]; then + BOOT=local +fi + +if [ -n "${noresume}" ] || [ "$RESUME" = none ]; then + noresume=y +else + resume=${RESUME:-} +fi + +mount -t tmpfs -o "nodev,noexec,nosuid,size=${RUNSIZE:-10%},mode=0755" tmpfs /run +mkdir -m 0700 /run/initramfs + +if [ -n "$log_output" ]; then + exec >$log_output 2>&1 + unset log_output +fi + +maybe_break top + +# Don't do log messages here to avoid confusing graphical boots +run_scripts /scripts/init-top + +maybe_break modules +[ "$quiet" != "y" ] && log_begin_msg "Loading essential drivers" +[ -n "${netconsole}" ] && /sbin/modprobe netconsole netconsole="${netconsole}" +load_modules +[ "$quiet" != "y" ] && log_end_msg + +starttime="$(_uptime)" +starttime=$((starttime + 1)) # round up +export starttime + +if [ "$ROOTDELAY" ]; then + sleep "$ROOTDELAY" +fi + +maybe_break premount +[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-premount" +run_scripts /scripts/init-premount +[ "$quiet" != "y" ] && log_end_msg + +maybe_break mount +log_begin_msg "Mounting root file system" +# Always load local and nfs (since these might be needed for /etc or +# /usr, irrespective of the boot script used to mount the rootfs). +. /scripts/local +. /scripts/nfs +. /scripts/${BOOT} +parse_numeric "${ROOT}" +maybe_break mountroot +mount_top +mount_premount +mountroot +log_end_msg + +if read_fstab_entry /usr; then + log_begin_msg "Mounting /usr file system" + mountfs /usr + log_end_msg +fi + +# Mount cleanup +mount_bottom +nfs_bottom +local_bottom + +maybe_break bottom +[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/init-bottom" +# We expect udev's init-bottom script to move /dev to ${rootmnt}/dev +run_scripts /scripts/init-bottom +[ "$quiet" != "y" ] && log_end_msg + +# Move /run to the root +mount -n -o move /run ${rootmnt}/run + +validate_init() { + run-init -n "${rootmnt}" "${1}" +} + +# Check init is really there +if ! validate_init "$init"; then + echo "Target filesystem doesn't have requested ${init}." + init= + for inittest in /sbin/init /etc/init /bin/init /bin/sh; do + if validate_init "${inittest}"; then + init="$inittest" + break + fi + done +fi + +# No init on rootmount +if ! validate_init "${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, drop_caps) +unset debug +unset MODPROBE_OPTIONS +unset DPKG_ARCH +unset ROOTFLAGS +unset ROOTFSTYPE +unset ROOTDELAY +unset ROOT +unset IP +unset BOOT +unset BOOTIF +unset DEVICE +unset UBIMTD +unset blacklist +unset break +unset noresume +unset panic +unset quiet +unset readonly +unset resume +unset resume_offset +unset noresume +unset fastboot +unset forcefsck +unset fsckfix +unset starttime + +# Move virtual filesystems over to the real filesystem +mount -n -o move /sys ${rootmnt}/sys +mount -n -o move /proc ${rootmnt}/proc + +# Chain to real filesystem +# shellcheck disable=SC2086,SC2094 +exec run-init ${drop_caps} "${rootmnt}" "${init}" "$@" <"${rootmnt}/dev/console" >"${rootmnt}/dev/console" 2>&1 +echo "Something went badly wrong in the initramfs." +panic "Please file a bug on initramfs-tools." |