dracut: set TMPDIR to /var/tmp

[thirdparty/dracut.git] / modules.d / 99base / init

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
#
# Licensed under the GPLv2
#
# Copyright 2008-2010, Red Hat, Inc.
# Harald Hoyer <harald@redhat.com>
# Jeremy Katz <katzj@redhat.com>

wait_for_loginit()
{
    set +x
    [ "$RD_DEBUG" = "yes" ] || return
    [ -e /run/initramfs/loginit.pipe ] || return
    echo "DRACUT_LOG_END"
    exec 0<>/dev/console 1<>/dev/console 2<>/dev/console
        # wait for loginit
    i=0
    while [ $i -lt 10 ]; do
        if [ ! -e /run/initramfs/loginit.pipe ]; then
            j=$(jobs)
            [ -z "$j" ] && break
            [ -z "${j##*Running*}" ] || break
        fi
        sleep 0.1
        i=$(($i+1))
    done

    if [ $i -eq 10 ]; then
        kill %1 >/dev/null 2>&1
        kill $(while read line;do echo $line;done</run/initramfs/loginit.pid)
    fi

    set -x
    rm -f /run/initramfs/loginit.pipe /run/initramfs/loginit.pid
}

emergency_shell()
{
    set +e
    if [ "$1" = "-n" ]; then
        _rdshell_name=$2
        shift 2
    else
        _rdshell_name=dracut
    fi
    echo ; echo
    warn $@
    source_hook emergency
    echo
    wait_for_loginit
    [ -e /run/initramfs/.die ] && exit 1
    if getargbool 1 rd.shell -y rdshell || getarg rd.break rdbreak; then
        echo "Dropping to debug shell."
        echo
        export PS1="$_rdshell_name:\${PWD}# "
        [ -e /.profile ] || echo "exec 0<>/dev/console 1<>/dev/console 2<>/dev/console" > /.profile
        sh -i -l
    else
        warn "Boot has failed. To debug this issue add \"rdshell\" to the kernel command line."
        # cause a kernel panic
        exit 1
    fi
}

NEWROOT="/sysroot"

trap "emergency_shell Signal caught!" 0
OLDPATH=$PATH
PATH=/usr/sbin:/usr/bin:/sbin:/bin
export PATH

RD_DEBUG=""
. /lib/dracut-lib.sh

[ -c /dev/null ] || mknod -m 0666 /dev/null c 1 3

# mount some important things
[ ! -d /proc/self ] && \
    mount -t proc -o nosuid,noexec,nodev /proc /proc >/dev/null 2>&1

[ ! -d /sys/kernel ] && \
    mount -t sysfs -o nosuid,noexec,nodev /sys /sys >/dev/null 2>&1

setdebug

if [ "$RD_DEBUG" = "yes" ]; then
    getarg quiet && DRACUT_QUIET="yes"
    a=$(getarg loglevel=)
    [ -n "$a" ] && [ $a -ge 8 ] && unset DRACUT_QUIET
fi

if [ -x /lib/systemd/systemd-timestamp ]; then
    RD_TIMESTAMP=$(/lib/systemd/systemd-timestamp)
else
    read RD_TIMESTAMP _tmp < /proc/uptime
    unset _tmp
fi

ismounted /sys || \
    mount -t sysfs -o nosuid,noexec,nodev /sys /sys >/dev/null 2>&1

if ! ismounted /dev; then
    # try to mount devtmpfs
    if ! mount -t devtmpfs -o mode=0755,nosuid,noexec udev /dev >/dev/null 2>&1; then
        # if it failed fall back to normal tmpfs
        mount -t tmpfs -o mode=0755,nosuid udev /dev >/dev/null 2>&1
        # Make some basic devices first, let udev handle the rest
        mknod -m 0666 /dev/null c 1 3
        mknod -m 0666 /dev/ptmx c 5 2
        mknod -m 0600 /dev/console c 5 1
        mknod -m 0660 /dev/kmsg c 1 11
    fi
fi

# prepare the /dev directory
[ ! -h /dev/fd ] && ln -s /proc/self/fd /dev/fd >/dev/null 2>&1
[ ! -h /dev/stdin ] && ln -s /proc/self/fd/0 /dev/stdin >/dev/null 2>&1
[ ! -h /dev/stdout ] && ln -s /proc/self/fd/1 /dev/stdout >/dev/null 2>&1
[ ! -h /dev/stderr ] && ln -s /proc/self/fd/2 /dev/stderr >/dev/null 2>&1

if ! ismounted /dev/pts; then
    mkdir -m 0755 /dev/pts
    mount -t devpts -o gid=5,mode=620,noexec,nosuid devpts /dev/pts >/dev/null 2>&1
fi

if ! ismounted /dev/shm; then
    mkdir -m 0755 /dev/shm
    mount -t tmpfs -o mode=1777,nosuid,nodev  tmpfs /dev/shm >/dev/null 2>&1
fi

if ! ismounted /run; then
    mkdir -m 0755 /newrun
    mount -t tmpfs -o mode=0755,nosuid,nodev tmpfs /newrun >/dev/null 2>&1
    cp -a -t /newrun /run/*
    mount --move /newrun /run
    rm -fr /newrun
fi

UDEVVERSION=$(udevadm --version)
if [ $UDEVVERSION -gt 166 ]; then
    # newer versions of udev use /run/udev/rules.d
    export UDEVRULESD=/run/udev/rules.d
else
    mkdir -m 0755 /dev/.udev /dev/.udev/rules.d
    export UDEVRULESD=/dev/.udev/rules.d
fi

if [ "$RD_DEBUG" = "yes" ]; then
    mkfifo /run/initramfs/loginit.pipe
    loginit $DRACUT_QUIET </run/initramfs/loginit.pipe >/dev/console 2>&1 &
    exec >/run/initramfs/loginit.pipe 2>&1
else
    exec 0<>/dev/console 1<>/dev/console 2<>/dev/console
fi

source_conf /etc/conf.d

# run scriptlets to parse the command line
getarg 'rd.break=cmdline' 'rdbreak=cmdline' && emergency_shell -n cmdline "Break before cmdline"
source_hook cmdline

[ -z "$root" ] && die "No or empty root= argument"
[ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"

# Network root scripts may need updated root= options,
# so deposit them where they can see them (udev purges the env)
{
    echo "root='$root'"
    echo "rflags='$rflags'"
    echo "fstype='$fstype'"
    echo "netroot='$netroot'"
    echo "NEWROOT='$NEWROOT'"
} > /tmp/root.info

# pre-udev scripts run before udev starts, and are run only once.
getarg 'rd.break=pre-udev' 'rdbreak=pre-udev' && emergency_shell -n pre-udev "Break before pre-udev"
source_hook pre-udev

# start up udev and trigger cold plugs
udevd --daemon --resolve-names=never

UDEV_LOG_PRIO_ARG=--log-priority
UDEV_QUEUE_EMPTY="udevadm settle --timeout=0"

if [ $UDEVVERSION -lt 140 ]; then
    UDEV_LOG_PRIO_ARG=--log_priority
    UDEV_QUEUE_EMPTY="udevadm settle --timeout=1"
fi

getargbool 0 rd.udev.info -y rdudevinfo && udevproperty "$UDEV_LOG_PRIO_ARG=info"
getargbool 0 rd.udev.debug -y rdudevdebug && udevproperty "$UDEV_LOG_PRIO_ARG=debug"
udevproperty "hookdir=$hookdir"

getarg 'rd.break=pre-trigger' 'rdbreak=pre-trigger' && emergency_shell -n pre-trigger "Break before pre-trigger"
source_hook pre-trigger

# then the rest
udevadm trigger --action=add $udevtriggeropts  >/dev/null 2>&1

getarg 'rd.break=initqueue' 'rdbreak=initqueue' && emergency_shell -n initqueue "Break before initqueue"

RDRETRY=$(getarg rd.retry 'rd_retry=')
RDRETRY=${RDRETRY:-20}
RDRETRY=$(($RDRETRY*2))

i=0
while :; do

    check_finished && break

    udevsettle

    check_finished && break

    if [ -f $hookdir/initqueue/work ]; then
        rm $hookdir/initqueue/work
    fi

    for job in $hookdir/initqueue/*.sh; do
        [ -e "$job" ] || break
        job=$job . $job
        check_finished && break 2
    done

    $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue

    for job in $hookdir/initqueue/settled/*.sh; do
        [ -e "$job" ] || break
        job=$job . $job
        check_finished && break 2
    done

    $UDEV_QUEUE_EMPTY >/dev/null 2>&1 || continue

    # no more udev jobs and queues empty.
    sleep 0.5

    # dirty hack for some cdrom drives,
    # which report no medium for quiet
    # some time.
    for cdrom in /sys/block/sr*; do
        [ -e "$cdrom" ] || continue
        # skip, if cdrom medium was already found
        strstr "$(udevadm info --query=env --path=${cdrom##/sys})" \
            ID_CDROM_MEDIA && continue

        if [ -e "$cdrom"/events_poll_msecs -a ! -e "/tmp/.poll_${cdrom##*/}" ]; then
            msecs=$(while read a; do echo $a;done < "$cdrom"/events_poll_msecs)
            if [ "$msecs" = "-1" ]; then
                echo 250 > "$cdrom"/events_poll_msecs
                > "/tmp/.poll_${cdrom##*/}"
            fi
        else
            echo change > "$cdrom/uevent"
        fi
    done

    i=$(($i+1))
    [ $i -gt $RDRETRY ] \
        && { flock -s 9 ; emergency_shell "No root device \"$root\" found"; } 9>/.console_lock
done
unset job
unset queuetriggered

# reset cdrom polling
for cdrom in /sys/block/sr*; do
    [ -e "$cdrom" ] || continue
    if [ -e "$cdrom"/events_poll_msecs ]; then
        echo -1 > "$cdrom"/events_poll_msecs
    fi
done

# pre-mount happens before we try to mount the root filesystem,
# and happens once.
getarg 'rd.break=pre-mount' 'rdbreak=pre-mount' && emergency_shell -n pre-mount "Break pre-mount"
source_hook pre-mount


getarg 'rd.break=mount' 'rdbreak=mount' && emergency_shell -n mount "Break mount"
# mount scripts actually try to mount the root filesystem, and may
# be sourced any number of times. As soon as one suceeds, no more are sourced.
i=0
while :; do
    [ -d "$NEWROOT/proc" ] && break;
    for f in $hookdir/mount/*.sh; do
        [ -f "$f" ] && . "$f"
        [ -d "$NEWROOT/proc" ] && break;
    done

    i=$(($i+1))
    [ $i -gt 20 ] \
        && { flock -s 9 ; emergency_shell "Can't mount root filesystem"; } 9>/.console_lock
done

{
    echo -n "Mounted root filesystem "
    while read dev mp rest; do [ "$mp" = "$NEWROOT" ] && echo $dev; done < /proc/mounts
} | vinfo

# pre pivot scripts are sourced just before we switch over to the new root.
getarg 'rd.break=pre-pivot' 'rdbreak=pre-pivot' && emergency_shell -n pre-pivot "Break pre-pivot"
source_hook pre-pivot

# by the time we get here, the root filesystem should be mounted.
# Try to find init.
for i in "$(getarg real_init=)" "$(getarg init=)" /sbin/init /etc/init /init /bin/sh; do
    [ -n "$i" ] || continue
    if ! [ -d "$NEWROOT$i" ] && [ -L "$NEWROOT$i" -o -x "$NEWROOT$i" ]; then
        INIT="$i"
        break
    fi
done

[ "$INIT" ] || {
    echo "Cannot find init!"
    echo "Please check to make sure you passed a valid root filesystem!"
    emergency_shell
}

getarg rd.break rdbreak && emergency_shell -n switch_root "Break before switch_root"

if [ $UDEVVERSION -lt 168 ]; then
    # stop udev queue before killing it
    udevadm control --stop-exec-queue

    HARD=""
    while pidof udevd >/dev/null 2>&1; do
        for pid in $(pidof udevd); do
            kill $HARD $pid >/dev/null 2>&1
        done
        HARD="-9"
    done
else
    udevadm control --exit
    udevadm info --cleanup-db
fi

export RD_TIMESTAMP
set +x # Turn off debugging for this section
# Clean up the environment
for i in $(export -p); do
    i=${i#declare -x}
    i=${i#export}
    strstr "$i" "=" || continue
    i=${i%%=*}
    [ -z "$i" ] && continue
    case $i in
        root|PATH|HOME|TERM|PS4|RD_*)
            :;;
        *)
            unset "$i";;
    esac
done

initargs=""
read CLINE </proc/cmdline
if getarg init= >/dev/null ; then
    set +x # Turn off debugging for this section
    ignoreargs="console BOOT_IMAGE"
    # only pass arguments after init= to the init
    CLINE=${CLINE#*init=}
        set $CLINE
        shift
        for x in "$@"; do
            for s in $ignoreargs; do
                [ "${x%%=*}" = $s ] && continue 2
            done
            initargs="$initargs $x"
        done
        unset CLINE
else
    set +x # Turn off debugging for this section
    set $CLINE
    shift
    for x in "$@"; do
        case "$x" in
            [0-9]|s|S|single|emergency|auto ) \
                initargs="$initargs $x"
                ;;
        esac
    done
fi
[ "$RD_DEBUG" = "yes" ] && set -x

if [ -d "$NEWROOT"/run ]; then
    NEWRUN="${NEWROOT}/run"
    mount --bind /run "$NEWRUN"
    NEWINITRAMFSROOT="$NEWRUN/initramfs"

    if [ "$NEWINITRAMFSROOT/lib" -ef "/lib" ]; then
        for d in bin etc lib lib64 sbin tmp usr var; do
            [ -h /$d ] && ln -fsn $NEWINITRAMFSROOT/$d /$d
        done
    fi
else
    NEWRUN=/dev/.initramfs
    mkdir -m 0755 "$NEWRUN"
    mount --bind /run/initramfs "$NEWRUN"
fi

wait_for_loginit

info "Switching root"

umount -l /run

unset PS4

CAPSH=$(command -v capsh)
SWITCH_ROOT=$(command -v switch_root)
PATH=$OLDPATH
export PATH

if [ -f /etc/capsdrop ]; then
    . /etc/capsdrop
    info "Calling $INIT with capabilities $CAPS_INIT_DROP dropped."
    unset RD_DEBUG
    exec $CAPSH --drop="$CAPS_INIT_DROP" -- \
        -c "exec switch_root \"$NEWROOT\" \"$INIT\" $initargs" || \
    {
	warn "Command:"
	warn capsh --drop=$CAPS_INIT_DROP -- -c exec switch_root "$NEWROOT" "$INIT" $initargs
	warn "failed."
	emergency_shell
    }
else
    unset RD_DEBUG
    exec $SWITCH_ROOT "$NEWROOT" "$INIT" $initargs || {
	warn "Something went very badly wrong in the initramfs.  Please "
	warn "file a bug against dracut."
	emergency_shell
    }
fi