Add memory usage trace to diffrent hook points

[thirdparty/dracut.git] / modules.d / 99base / dracut-lib.sh

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh

debug_off() {
    set +x
}

debug_on() {
    [ "$RD_DEBUG" = "yes" ] && set -x
}

# returns OK if $1 contains $2
strstr() {
    [ "${1#*$2*}" != "$1" ]
}

# returns OK if $1 contains $2 at the beginning
str_starts() {
    [ "${1#$2*}" != "$1" ]
}

# returns OK if $1 contains $2 at the end
str_ends() {
    [ "${1%*$2}" != "$1" ]
}

# replaces all occurrences of 'search' in 'str' with 'replacement'
#
# str_replace str search replacement
#
# example:
# str_replace '  one two  three  ' ' ' '_'
str_replace() {
    local in="$1"; local s="$2"; local r="$3"
    local out=''

    while strstr "${in}" "$s"; do
        chop="${in%%$s*}"
        out="${out}${chop}$r"
        in="${in#*$s}"
    done
    echo "${out}${in}"
}

killall_proc_mountpoint() {
    local _pid
    local _t
    for _pid in /proc/*; do
        _pid=${_pid##/proc/}
        case $_pid in
            *[!0-9]*) continue;;
        esac
        [ -e /proc/$_pid/exe ] || continue
        [ -e /proc/$_pid/root ] || continue
        strstr "$(ls -l /proc/$_pid /proc/$_pid/fd 2>/dev/null)" "$1" && kill -9 $_pid
    done
}

_getcmdline() {
    local _line
    local _i
    unset _line
    if [ -z "$CMDLINE" ]; then
        unset CMDLINE_ETC CMDLINE_ETC_D
        if [ -e /etc/cmdline ]; then
            while read -r _line; do
                CMDLINE_ETC="$CMDLINE_ETC $_line";
            done </etc/cmdline;
        fi
        for _i in /etc/cmdline.d/*.conf; do
            [ -e "$_i" ] || continue
            while read -r _line; do
                CMDLINE_ETC_D="$CMDLINE_ETC_D $_line";
            done <"$_i";
        done
        read -r CMDLINE </proc/cmdline;
        CMDLINE="$CMDLINE_ETC_D $CMDLINE_ETC $CMDLINE"
    fi
}

_dogetarg() {
    local _o _val _doecho
    unset _val
    unset _o
    unset _doecho
    _getcmdline

    for _o in $CMDLINE; do
        if [ "${_o%%=*}" = "${1%%=*}" ]; then
            if [ -n "${1#*=}" -a "${1#*=*}" != "${1}" ]; then
                # if $1 has a "=<value>", we want the exact match
                if [ "$_o" = "$1" ]; then
                    _val="1";
                    unset _doecho
                fi
                continue
            fi

            if [ "${_o#*=}" = "$_o" ]; then
                # if cmdline argument has no "=<value>", we assume "=1"
                _val="1";
                unset _doecho
                continue
            fi

            _val=${_o#*=};
            _doecho=1
        fi
    done
    if [ -n "$_val" ]; then
        [ "x$_doecho" != "x" ] && echo "$_val";
        return 0;
    fi
    return 1;
}

getarg() {
    debug_off
    local _deprecated _newoption
    while [ $# -gt 0 ]; do
        case $1 in
            -d) _deprecated=1; shift;;
            -y) if _dogetarg $2 >/dev/null; then
                    if [ "$_deprecated" = "1" ]; then
                        [ -n "$_newoption" ] && warn "Kernel command line option '$2' is deprecated, use '$_newoption' instead." || warn "Option '$2' is deprecated."
                    fi
                    echo 1
                    debug_on
                    return 0
                fi
                _deprecated=0
                shift 2;;
            -n) if _dogetarg $2 >/dev/null; then
                    echo 0;
                    if [ "$_deprecated" = "1" ]; then
                        [ -n "$_newoption" ] && warn "Kernel command line option '$2' is deprecated, use '$_newoption=0' instead." || warn "Option '$2' is deprecated."
                    fi
                    debug_on
                    return 1
                fi
                _deprecated=0
                shift 2;;
            *)  if [ -z "$_newoption" ]; then
                    _newoption=$1
                fi
                if _dogetarg $1; then
                    if [ "$_deprecated" = "1" ]; then
                        [ -n "$_newoption" ] && warn "Kernel command line option '$1' is deprecated, use '$_newoption' instead." || warn "Option '$1' is deprecated."
                    fi
                    debug_on
                    return 0;
                fi
                _deprecated=0
                shift;;
        esac
    done
    debug_on
    return 1
}

# getargbool <defaultval> <args...>
# False if "getarg <args...>" returns "0", "no", or "off".
# True if getarg returns any other non-empty string.
# If not found, assumes <defaultval> - usually 0 for false, 1 for true.
# example: getargbool 0 rd.info
#   true: rd.info, rd.info=1, rd.info=xxx
#   false: rd.info=0, rd.info=off, rd.info not present (default val is 0)
getargbool() {
    local _b
    unset _b
    local _default
    _default=$1; shift
    _b=$(getarg "$@")
    [ $? -ne 0 -a -z "$_b" ] && _b=$_default
    if [ -n "$_b" ]; then
        [ $_b = "0" ] && return 1
        [ $_b = "no" ] && return 1
        [ $_b = "off" ] && return 1
    fi
    return 0
}

isdigit() {
    case "$1" in
        *[!0-9]*|"") return 1;;
    esac

    return 0
}

# getargnum <defaultval> <minval> <maxval> <arg>
# Will echo the arg if it's in range [minval - maxval].
# If it's not set or it's not valid, will set it <defaultval>.
# Note all values are required to be >= 0 here.
# <defaultval> should be with [minval -maxval].
getargnum() {
    local _b
    unset _b
    local _default _min _max
    _default=$1; shift
    _min=$1; shift
    _max=$1; shift
    _b=$(getarg "$1")
    [ $? -ne 0 -a -z "$_b" ] && _b=$_default
    if [ -n "$_b" ]; then
        isdigit "$_b" && _b=$(($_b)) && \
        [ $_b -ge $_min ] && [ $_b -le $_max ] && echo $_b && return
    fi
    echo $_default
}

_dogetargs() {
    debug_off
    local _o _found _key
    unset _o
    unset _found
    _getcmdline
    _key=$1
    set --
    for _o in $CMDLINE; do
        if [ "$_o" = "$_key" ]; then
            _found=1;
        elif [ "${_o%%=*}" = "${_key%=}" ]; then
            [ -n "${_o%%=*}" ] && set -- "$@" "${_o#*=}";
            _found=1;
        fi
    done
    if [ -n "$_found" ]; then
        [ $# -gt 0 ] && echo -n "$@"
        return 0
    fi
    return 1;
}

getargs() {
    debug_off
    local _val _i _args _gfound _deprecated
    unset _val
    unset _gfound
    _newoption="$1"
    _args="$@"
    set --
    for _i in $_args; do
        if [ "$i" = "-d" ]; then
            _deprecated=1
            continue
        fi
        _val="$(_dogetargs $_i)"
        if [ $? -eq 0 ]; then
            if [ "$_deprecated" = "1" ]; then
                [ -n "$_newoption" ] && warn "Option '$_i' is deprecated, use '$_newoption' instead." || warn "Option $_i is deprecated!"
            fi
            _gfound=1
        fi
        [ -n "$_val" ] && set -- "$@" "$_val"
        _deprecated=0
    done
    if [ -n "$_gfound" ]; then
        if [ $# -gt 0 ]; then
            echo -n "$@"
        else
            echo -n 1
        fi
        debug_on
        return 0
    fi
    debug_on
    return 1;
}


# Prints value of given option.  If option is a flag and it's present,
# it just returns 0.  Otherwise 1 is returned.
# $1 = options separated by commas
# $2 = option we are interested in
#
# Example:
# $1 = cipher=aes-cbc-essiv:sha256,hash=sha256,verify
# $2 = hash
# Output:
# sha256
getoptcomma() {
    local line=",$1,"; local opt="$2"; local tmp

    case "${line}" in
        *,${opt}=*,*)
            tmp="${line#*,${opt}=}"
            echo "${tmp%%,*}"
            return 0
            ;;
        *,${opt},*) return 0;;
    esac
    return 1
}

# Splits given string 'str' with separator 'sep' into variables 'var1', 'var2',
# 'varN'.  If number of fields is less than number of variables, remaining are
# not set.  If number of fields is greater than number of variables, the last
# variable takes remaining fields.  In short - it acts similary to 'read'.
#
# splitsep sep str var1 var2 varN
#
# example:
#   splitsep ':' 'foo:bar:baz' v1 v2
# in result:
#   v1='foo', v2='bar:baz'
#
# TODO: ':' inside fields.
splitsep() {
    debug_off
    local sep="$1"; local str="$2"; shift 2
    local tmp

    while [ -n "$str" -a "$#" -gt 1 ]; do
        tmp="${str%%$sep*}"
        eval "$1='${tmp}'"
        str="${str#"$tmp"}"
        str="${str#$sep}"
        shift
    done
    [ -n "$str" -a -n "$1" ] && eval "$1='$str'"
    debug_on
    return 0
}

setdebug() {
    if [ -z "$RD_DEBUG" ]; then
        if [ -e /proc/cmdline ]; then
            RD_DEBUG=no
            if getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
                RD_DEBUG=yes
                [ -n "$BASH" ] && \
                    export PS4='${BASH_SOURCE}@${LINENO}(${FUNCNAME[0]}): ';
           fi
        fi
        export RD_DEBUG
    fi
    debug_on
}

setdebug

source_all() {
    local f
    local _dir
    _dir=$1; shift
    [ "$_dir" ] && [  -d "/$_dir" ] || return
    for f in "/$_dir"/*.sh; do [ -e "$f" ] && . "$f" "$@"; done
}

hookdir=/lib/dracut/hooks
export hookdir

source_hook() {
    local _dir
    _dir=$1; shift
    source_all "/lib/dracut/hooks/$_dir" "$@"
}

check_finished() {
    local f
    for f in $hookdir/initqueue/finished/*.sh; do 
        [ "$f" = "$hookdir/initqueue/finished/*.sh" ] && return 0
        { [ -e "$f" ] && ( . "$f" ) ; } || return 1
    done
    return 0
}

source_conf() {
    local f
    [ "$1" ] && [  -d "/$1" ] || return
    for f in "/$1"/*.conf; do [ -e "$f" ] && . "$f"; done
}

die() {
    {
        echo "<24>dracut: FATAL: $*";
        echo "<24>dracut: Refusing to continue";
    } > /dev/kmsg

    {
        echo "warn dracut: FATAL: \"$*\"";
        echo "warn dracut: Refusing to continue";
    } >> $hookdir/emergency/01-die.sh

    > /run/initramfs/.die
    emergency_shell
    exit 1
}

check_quiet() {
    if [ -z "$DRACUT_QUIET" ]; then
        DRACUT_QUIET="yes"
        getargbool 0 rd.info -d -y rdinfo && DRACUT_QUIET="no"
        getargbool 0 rd.debug -d -y rdinitdebug && DRACUT_QUIET="no"
        getarg quiet || DRACUT_QUIET="yes"
        a=$(getarg loglevel=)
        [ -n "$a" ] && [ $a -ge 28 ] && DRACUT_QUIET="yes"
        export DRACUT_QUIET
    fi
}

if [ -z "$DRACUT_SYSTEMD" ]; then

    warn() {
        check_quiet
        echo "<28>dracut Warning: $*" > /dev/kmsg
        echo "dracut Warning: $*" >&2
    }

    info() {
        check_quiet
        echo "<30>dracut: $*" > /dev/kmsg
        [ "$DRACUT_QUIET" != "yes" ] && \
            echo "dracut: $*"
    }

else

    warn() {
        echo "Warning: $*" >&2
    }

    info() {
        echo "$*"
    }

fi

vwarn() {
    while read line; do
        warn $line;
    done
}

vinfo() {
    while read line; do
        info $line;
    done
}

check_occurances() {
    # Count the number of times the character $ch occurs in $str
    # Return 0 if the count matches the expected number, 1 otherwise
    local str="$1"
    local ch="$2"
    local expected="$3"
    local count=0

    while [ "${str#*$ch}" != "${str}" ]; do
        str="${str#*$ch}"
        count=$(( $count + 1 ))
    done

    [ $count -eq $expected ]
}

incol2() {
    debug_off
    local dummy check;
    local file="$1";
    local str="$2";

    [ -z "$file" ] && return 1;
    [ -z "$str"  ] && return 1;

    while read dummy check restofline; do
        if [ "$check" = "$str" ]; then
            debug_on
            return 0
        fi
    done < $file
    debug_on
    return 1
}

udevsettle() {
    [ -z "$UDEVVERSION" ] && export UDEVVERSION=$(udevadm --version)

    if [ $UDEVVERSION -ge 143 ]; then
        udevadm settle --exit-if-exists=$hookdir/initqueue/work $settle_exit_if_exists
    else
        udevadm settle --timeout=30
    fi
}

udevproperty() {
    [ -z "$UDEVVERSION" ] && export UDEVVERSION=$(udevadm --version)

    if [ $UDEVVERSION -ge 143 ]; then
        for i in "$@"; do udevadm control --property=$i; done
    else
        for i in "$@"; do udevadm control --env=$i; done
    fi
}

find_mount() {
    local dev mnt etc wanted_dev
    wanted_dev="$(readlink -e -q $1)"
    while read dev mnt etc; do
        [ "$dev" = "$wanted_dev" ] && echo "$dev" && return 0
    done < /proc/mounts
    return 1
}

# usage: ismounted <mountpoint>
# usage: ismounted /dev/<device>
if command -v findmnt >/dev/null; then
    ismounted() {
        findmnt "$1" > /dev/null 2>&1
    }
else
    ismounted() {
        if [ -b "$1" ]; then
            find_mount "$1" > /dev/null && return 0
            return 1
        fi

        while read a m a; do
            [ "$m" = "$1" ] && return 0
        done < /proc/mounts
        return 1
    }
fi

# root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>]
# root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>]
nfsroot_to_var() {
    # strip nfs[4]:
    local arg="$@:"
    nfs="${arg%%:*}"
    arg="${arg##$nfs:}"

    # check if we have a server
    if strstr "$arg" ':/*' ; then
        server="${arg%%:/*}"
        arg="/${arg##*:/}"
    fi

    path="${arg%%:*}"

    # rest are options
    options="${arg##$path}"
    # strip leading ":"
    options="${options##:}"
    # strip  ":"
    options="${options%%:}"

    # Does it really start with '/'?
    [ -n "${path%%/*}" ] && path="error";

    #Fix kernel legacy style separating path and options with ','
    if [ "$path" != "${path#*,}" ] ; then
        options=${path#*,}
        path=${path%%,*}
    fi
}

# Create udev rule match for a device with its device name, or the udev property
# ID_FS_UUID or ID_FS_LABEL
#
# example:
#   udevmatch LABEL=boot
# prints:
#   ENV{ID_FS_LABEL}="boot"
#
# TOOD: symlinks
udevmatch() {
    case "$1" in
    UUID=????????-????-????-????-????????????|LABEL=*)
        printf 'ENV{ID_FS_%s}=="%s"' "${1%%=*}" "${1#*=}"
        ;;
    UUID=*)
        printf 'ENV{ID_FS_UUID}=="%s*"' "${1#*=}"
        ;;
    /dev/?*) printf 'KERNEL=="%s"' "${1#/dev/}" ;;
    *) return 255 ;;
    esac
}

# Prints unique path for potential file inside specified directory.  It consists
# of specified directory, prefix and number at the end which is incremented
# until non-existing file is found.
#
# funiq dir prefix
#
# example:
# # ls /mnt
# cdrom0 cdrom1
#
# # funiq /mnt cdrom
# /mnt/cdrom2
funiq() {
    local dir="$1"; local prefix="$2"
    local i=0

    [ -d "${dir}" ] || return 1

    while [ -e "${dir}/${prefix}$i" ]; do
        i=$(($i+1)) || return 1
    done

    echo "${dir}/${prefix}$i"
}

# Creates unique directory and prints its path.  It's using funiq to generate
# path.
#
# mkuniqdir subdir new_dir_name
mkuniqdir() {
    local dir="$1"; local prefix="$2"
    local retdir; local retdir_new

    [ -d "${dir}" ] || mkdir -m 0755 -p "${dir}" || return 1

    retdir=$(funiq "${dir}" "${prefix}") || return 1
    until mkdir -m 0755 "${retdir}" 2>/dev/null; do
        retdir_new=$(funiq "${dir}" "${prefix}") || return 1
        [ "$retdir_new" = "$retdir" ] && return 1
        retdir="$retdir_new"
    done

    echo "${retdir}"
}

# Copy the contents of SRC into DEST, merging the contents of existing
# directories (kinda like rsync, or cpio -p).
# Creates DEST if it doesn't exist. Overwrites files with the same names.
#
# copytree SRC DEST
copytree() {
    local src="$1" dest="$2"
    mkdir -p "$dest"; dest=$(readlink -e -q "$dest")
    ( cd "$src"; cp -af . -t "$dest" )
}

# Evaluates command for UUIDs either given as arguments for this function or all
# listed in /dev/disk/by-uuid.  UUIDs doesn't have to be fully specified.  If
# beginning is given it is expanded to all matching UUIDs.  To pass full UUID to
# your command use '$___' as a place holder.  Remember to escape '$'!
#
# foreach_uuid_until [ -p prefix ] command UUIDs
#
# prefix - string to put just before $___
# command - command to be evaluated
# UUIDs - list of UUIDs separated by space
#
# The function returns after *first successful evaluation* of the given command
# with status 0.  If evaluation fails for every UUID function returns with
# status 1.
#
# Example:
# foreach_uuid_until "mount -U \$___ /mnt; echo OK; umount /mnt" \
#       "01234 f512 a235567f-12a3-c123-a1b1-01234567abcb"
foreach_uuid_until() (
    cd /dev/disk/by-uuid

    [ "$1" = -p ] && local prefix="$2" && shift 2
    local cmd="$1"; shift; local uuids_list="$*"
    local uuid; local full_uuid; local ___

    [ -n "${cmd}" ] || return 1

    for uuid in ${uuids_list:-*}; do
        for full_uuid in ${uuid}*; do
            [ -e "${full_uuid}" ] || continue
            ___="${prefix}${full_uuid}"
            eval ${cmd} && return 0
        done
    done

    return 1
)

# Get kernel name for given device.  Device may be the name too (then the same
# is returned), a symlink (full path), UUID (prefixed with "UUID=") or label
# (prefixed with "LABEL=").  If just a beginning of the UUID is specified or
# even an empty, function prints all device names which UUIDs match - every in
# single line.
#
# NOTICE: The name starts with "/dev/".
#
# Example:
#   devnames UUID=123
# May print:
#   /dev/dm-1
#   /dev/sdb1
#   /dev/sdf3
devnames() {
    local dev="$1"; local d; local names

    case "$dev" in
    UUID=*)
        dev="$(foreach_uuid_until '! blkid -U $___' "${dev#UUID=}")" \
            && return 255
        [ -z "$dev" ] && return 255
        ;;
    LABEL=*) dev="$(blkid -L "${dev#LABEL=}")" || return 255 ;;
    /dev/?*) ;;
    *) return 255 ;;
    esac

    for d in $dev; do
        names="$names
$(readlink -e -q "$d")" || return 255
    done

    echo "${names#
}"
}


usable_root() {
    local _d
    [ -d $1 ] || return 1
    for _d in proc sys dev; do
        [ -e "$1"/$_d ] || return 1
    done
    return 0
}

inst_hook() {
    local _hookname _unique _name _job _exe
    while [ $# -gt 0 ]; do
        case "$1" in
            --hook)
                _hookname="/$2";shift;;
            --unique)
                _unique="yes";;
            --name)
                _name="$2";shift;;
            *)
                break;;
        esac
        shift
    done

    if [ -z "$_unique" ]; then
        _job="${_name}$$"
    else
        _job="${_name:-$1}"
        _job=${_job##*/}
    fi

    _exe=$1
    shift

    [ -x "$_exe" ] || _exe=$(command -v $_exe)

    if [ -n "$onetime" ]; then
        {
            echo '[ -e "$_job" ] && rm "$_job"'
            echo "$_exe $@"
        } > "/tmp/$$-${_job}.sh"
    else
        echo "$_exe $@" > "/tmp/$$-${_job}.sh"
    fi

    mv -f "/tmp/$$-${_job}.sh" "$hookdir/${_hookname}/${_job}.sh"
}

# inst_mount_hook <mountpoint> <prio> <name> <script>
#
# Install a mount hook with priority <prio>,
# which executes <script> as soon as <mountpoint> is mounted.
inst_mount_hook() {
    local _prio="$2" _jobname="$3" _script="$4"
    local _hookname="mount-$(str_replace "$1" '/' '\\x2f')"
    [ -d "$hookdir/${_hookname}" ] || mkdir -p "$hookdir/${_hookname}"
    inst_hook --hook "$_hookname" --unique --name "${_prio}-${_jobname}" "$_script"
}

# add_mount_point <dev> <mountpoint> <filesystem> <fsopts>
#
# Mount <dev> on <mountpoint> with <filesystem> and <fsopts>
# and call any mount hooks, as soon, as it is mounted
add_mount_point() {
    local _dev="$1" _mp="$2" _fs="$3" _fsopts="$4"
    local _hookname="mount-$(str_replace "$2" '/' '\\x2f')"
    local _devname="dev-$(str_replace "$1" '/' '\\x2f')"
    echo "$_dev $_mp $_fs $_fsopts 0 0" >> /etc/fstab

    exec 7>/etc/udev/rules.d/99-mount-${_devname}.rules
    echo 'SUBSYSTEM!="block", GOTO="mount_end"' >&7
    echo 'ACTION!="add|change", GOTO="mount_end"' >&7
    if [ -n "$_dev" ]; then
        udevmatch "$_dev" >&7 || {
            warn "add_mount_point dev=$_dev incorrect!"
            continue
        }
        printf ', ' >&7
    fi

    {
        printf -- 'RUN+="%s --unique --onetime ' $(command -v initqueue)
        printf -- '--name mount-%%k '
        printf -- '%s %s"\n' "$(command -v mount_hook)" "${_mp}"
    } >&7
    echo 'LABEL="mount_end"' >&7
    exec 7>&-
}

# wait_for_mount <mountpoint>
#
# Installs a initqueue-finished script,
# which will cause the main loop only to exit,
# if <mountpoint> is mounted.
wait_for_mount()
{
    local _name
    _name="$(str_replace "$1" '/' '\\x2f')"
    printf '. /lib/dracut-lib.sh\nismounted "%s"\n' $1 \
        >> "$hookdir/initqueue/finished/ismounted-${_name}.sh"
    {
        printf 'ismounted "%s" || ' $1
        printf 'warn "\"%s\" is not mounted"\n' $1
    } >> "$hookdir/emergency/90-${_name}.sh"
}

# wait_for_dev <dev>
#
# Installs a initqueue-finished script,
# which will cause the main loop only to exit,
# if the device <dev> is recognized by the system.
wait_for_dev()
{
    local _name
    _name="$(str_replace "$1" '/' '\\x2f')"
    printf '[ -e "%s" ]\n' $1 \
        >> "$hookdir/initqueue/finished/devexists-${_name}.sh"
    {
        printf '[ -e "%s" ] || ' $1
        printf 'warn "\"%s\" does not exist"\n' $1
    } >> "$hookdir/emergency/80-${_name}.sh"
}

cancel_wait_for_dev()
{
    local _name
    _name="$(str_replace "$1" '/' '\\x2f')"
    rm -f "$hookdir/initqueue/finished/devexists-${_name}.sh"
    rm -f "$hookdir/emergency/80-${_name}.sh"
}

killproc() {
    debug_off
    local _exe="$(command -v $1)"
    local _sig=$2
    local _i
    [ -x "$_exe" ] || return 1
    for _i in /proc/[0-9]*; do
        [ "$_i" = "/proc/1" ] && continue
        if [ -e "$_i"/_exe ] && [  "$_i/_exe" -ef "$_exe" ] ; then
            kill $_sig ${_i##*/}
        fi
    done
    debug_on
}

need_shutdown() {
    >/run/initramfs/.need_shutdown
}

wait_for_loginit()
{
    [ "$RD_DEBUG" = "yes" ] || return
    [ -e /run/initramfs/loginit.pipe ] || return
    debug_off
    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

    setdebug
    rm -f /run/initramfs/loginit.pipe /run/initramfs/loginit.pid
}

_emergency_shell()
{
    local _name="$1"
    if [ -n "$DRACUT_SYSTEMD" ]; then
        > /.console_lock
        echo "PS1=\"$_name:\${PWD}# \"" >/etc/profile
        systemctl start dracut-emergency.service
        rm -f /.console_lock
    else
        debug_off
        echo
        /sbin/sosreport
        echo 'You might want to save "/run/initramfs/sosreport.txt" to a USB stick or /boot'
        echo 'after mounting them and attach it to a bug report.'
        if ! RD_DEBUG= getargbool 0 rd.debug -d -y rdinitdebug -d -y rdnetdebug; then
            echo
            echo 'To get more debug information in the report,'
            echo 'reboot with "rd.debug" added to the kernel command line.'
        fi
        echo
        echo 'Dropping to debug shell.'
        echo
        export PS1="$_name:\${PWD}# "
        [ -e /.profile ] || >/.profile

        _ctty="$(RD_DEBUG= getarg rd.ctty=)" && _ctty="/dev/${_ctty##*/}"
        if [ -z "$_ctty" ]; then
            _ctty=console
            while [ -f /sys/class/tty/$_ctty/active ]; do
                _ctty=$(cat /sys/class/tty/$_ctty/active)
                _ctty=${_ctty##* } # last one in the list
            done
            _ctty=/dev/$_ctty
        fi
        [ -c "$_ctty" ] || _ctty=/dev/tty1
        case "$(/usr/bin/setsid --help 2>&1)" in *--ctty*) CTTY="--ctty";; esac
        setsid $CTTY /bin/sh -i -l 0<>$_ctty 1<>$_ctty 2<>$_ctty
    fi
}

emergency_shell()
{
    local _ctty
    set +e
    local _rdshell_name="dracut" action="Boot" hook="emergency"
    if [ "$1" = "-n" ]; then
        _rdshell_name=$2
        shift 2
    elif [ "$1" = "--shutdown" ]; then
        _rdshell_name=$2; action="Shutdown"; hook="shutdown-emergency"
        if [ -x /bin/plymouth ]; then
            /bin/plymouth --hide-splash
        elif [ -x /oldroot/bin/plymouth ]; then
            /oldroot/bin/plymouth --hide-splash
        fi
        shift 2
    fi

    echo ; echo
    warn "$*"
    source_hook "$hook"
    echo

    if getargbool 1 rd.shell -d -y rdshell || getarg rd.break -d rdbreak; then
        _emergency_shell $_rdshell_name
    else
        warn "$action has failed. To debug this issue add \"rd.shell rd.debug\" to the kernel command line."
        # cause a kernel panic
        exit 1
    fi
    [ -e /run/initramfs/.die ] && exit 1
}

# Retain the values of these variables but ensure that they are unexported
# This is a POSIX-compliant equivalent of bash's "export -n"
export_n()
{
    local var
    local val
    for var in "$@"; do
        eval val=\$$var
        unset $var
        [ -n "$val" ] && eval $var=\"$val\"
    done
}

# returns OK if list1 contains all elements of list2, i.e. checks if list2 is a
# sublist of list1.  An order and a duplication doesn't matter.
#
# $1 = separator
# $2 = list1
# $3 = list2
# $4 = ignore values, separated by $1
listlist() {
    local _sep="$1"
    local _list="${_sep}${2}${_sep}"
    local _sublist="$3"
    [ -n "$4" ] && local _iglist="${_sep}${4}${_sep}"
    local IFS="$_sep"
    local _v

    [ "$_list" = "$_sublist" ] && return 0

    for _v in $_sublist; do
        if [ -n "$_v" ] && ! ( [ -n "$_iglist" ] && strstr "$_iglist" "$_v" )
        then
            strstr "$_list" "$_v" || return 1
        fi
    done

    return 0
}

# returns OK if both lists contain the same values.  An order and a duplication
# doesn't matter.
# 
# $1 = separator
# $2 = list1
# $3 = list2
# $4 = ignore values, separated by $1
are_lists_eq() {
    listlist "$1" "$2" "$3" "$4" && listlist "$1" "$3" "$2" "$4"
}

setmemdebug() {
    if [ -z "$DEBUG_MEM_LEVEL" ]; then
        export DEBUG_MEM_LEVEL=$(getargnum 0 0 3 rd.memdebug)
    fi
}

setmemdebug

# parameters: msg [trace_level:trace]...
make_trace_mem()
{
    local msg
    msg="$1"
    shift
    if [ -n "$DEBUG_MEM_LEVEL" ] && [ "$DEBUG_MEM_LEVEL" -gt 0 ]; then
        make_trace show_memstats $DEBUG_MEM_LEVEL "[debug_mem]" "$msg" "$@"
    fi
}

# parameters: func log_level prefix msg [trace_level:trace]...
make_trace()
{
    local func log_level prefix msg msg_printed
    local trace trace_level trace_in_higher_levels insert_trace

    func=$1
    shift

    log_level=$1
    shift

    prefix=$1
    shift

    msg=$1
    shift

    if [ -z "$log_level" ]; then
        return
    fi

    msg=$(echo $msg)

    msg_printed=0
    while [ $# -gt 0 ]; do
        trace=${1%%:*}
        trace_level=${trace%%+}
        [ "$trace" != "$trace_level" ] && trace_in_higher_levels="yes"
        trace=${1##*:}

        if [ -z "$trace_level" ]; then
            trace_level=0
        fi

        insert_trace=0
        if [ -n "$trace_in_higher_levels" ]; then
            if [ "$log_level" -ge "$trace_level" ]; then
                insert_trace=1
            fi
        else
            if [ "$log_level" -eq "$trace_level" ]; then
                insert_trace=1
            fi
        fi

        if [ $insert_trace -eq 1 ]; then
            if [ $msg_printed -eq 0 ]; then
                echo "$prefix $msg"
                msg_printed=1
            fi
            $func $trace
        fi
        shift
    done
}

# parameters: type
show_memstats()
{
    case $1 in
        shortmem)
            cat /proc/meminfo  | grep -e "^MemFree" -e "^Cached" -e "^Slab"
            ;;
        mem)
            cat /proc/meminfo
            ;;
        slab)
            cat /proc/slabinfo
            ;;
        iomem)
            cat /proc/iomem
            ;;
    esac
}