/usr/share/initramfs-tools/scripts/functions is in initramfs-tools-core 0.130ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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_log_msg()
{
if [ "$quiet" = "y" ]; then return; fi
printf "$@"
}
log_success_msg()
{
_log_msg "Success: $@\n"
}
log_failure_msg()
{
_log_msg "Failure: $@\n"
}
log_warning_msg()
{
_log_msg "Warning: $@\n"
}
log_begin_msg()
{
_log_msg "Begin: $@ ... "
}
log_end_msg()
{
_log_msg "done.\n"
}
# Add failure hook
add_mountroot_fail_hook()
{
mkdir -p /tmp/mountroot-fail-hooks.d
ln -s "$0" /tmp/mountroot-fail-hooks.d/"$1"
}
# Run failure hooks.
# When a failure hook exits "1", it has not done anything to correct the
# system. Exiting "0" means that something has been attempted to resolve
# the lack of a root filesystem.
# Hooks are run in lexigraphical order, and are responsible for removing
# themselves if they should not re-run in a later cycle. When one exits
# "0", the stack is stopped, so the caller can return to the main rootfs
# wait loop.
try_failure_hooks()
{
local hook
# Disable usplash so text from hooks can be seen
if [ -x /sbin/usplash_write ]; then
/sbin/usplash_write "QUIT"
fi
chvt 1
if [ -x /bin/plymouth ] && plymouth --ping; then
/bin/plymouth hide-splash > /dev/null 2>&1
fi
for hook in /tmp/mountroot-fail-hooks.d/*; do
if [ -x ${hook} ] && ${hook} mountfail; then
return 0
fi
done
return 1
}
panic()
{
local console rest
if command -v chvt >/dev/null 2>&1; then
chvt 1
fi
echo "$@"
# Disallow console access
if [ -n "${panic}" ]; then
echo "Rebooting automatically due to panic= boot argument"
sleep ${panic}
reboot
exit # in case reboot fails, force kernel panic
fi
run_scripts /scripts/panic
# Try to use setsid, which will enable job control in the shell
# and paging in more
if command -v setsid >/dev/null 2>&1; then
read console rest </proc/consoles
if [ "${console}" = "tty0" ]; then
# Need to choose a specific VT
console="tty1"
fi
# We don't have 'setsid -c' so we need to setsid, open
# the tty, and finally exec an interactive shell
REASON="$@" PS1='(initramfs) ' setsid sh -c "exec sh -i <>/dev/${console} 1>&0 2>&1"
else
REASON="$@" PS1='(initramfs) ' sh -i </dev/console >/dev/console 2>&1
fi
}
maybe_break()
{
case ",$break," in
*,$1,*)
if [ "$1" = "top" ]; then
# udev is not yet running, so load keyboard drivers
if [ "${quiet}" = "y" ]; then
opts="-q"
else
opts="-v"
fi
modprobe ${opts} -a i8042 atkbd ehci-pci ehci-orion \
ehci-hcd ohci-hcd ohci-pci uhci-hcd usbhid xhci \
xhci-pci xhci-hcd
sleep 2
for modalias in /sys/bus/hid/devices/*/modalias; do
if [ -f "${modalias}" ]; then
modprobe ${opts} -b "$(cat ${modalias})"
fi
done
fi
panic "Spawning shell within the initramfs"
;;
esac
}
render()
{
eval "echo -n \${$@}"
}
# For boot time only; this is overridden at build time in hook-functions
run_scripts()
{
initdir=${1}
[ ! -d ${initdir} ] && return
shift
. ${initdir}/ORDER
}
# Load custom modules first
load_modules()
{
if [ -e /conf/modules ]; then
cat /conf/modules | while read m; do
# Skip empty lines
if [ -z "$m" ]; then
continue
fi
# Skip comments - d?ash removes whitespace prefix
com=$(printf "%.1s" "${m}")
if [ "$com" = "#" ]; then
continue
fi
modprobe $m
done
fi
}
# lilo compatibility
parse_numeric() {
case $1 in
*:*)
# Does it match /[0-9]*:[0-9]*/?
minor=${1#*:}
major=${1%:*}
case $major$minor in
*[!0-9]*)
# No.
return
;;
esac
;;
"" | *[!A-Fa-f0-9]*)
# "", "/*", etc.
return
;;
*)
# [A-Fa-f0-9]*
value=$(( 0x${1} ))
minor=$(( (${value} & 0xff) | (${value} >> 12) & 0xfff00 ))
major=$(( (${value} >> 8) & 0xfff ))
;;
esac
ROOT="/dev/block/${major}:${minor}"
}
# Parameter: device node to check
# Echos fstype to stdout
# Return value: indicates if an fs could be recognized
get_fstype ()
{
local FS FSTYPE FSSIZE RET
FS="${1}"
# blkid has a more complete list of file systems,
# but fstype is more robust
FSTYPE="unknown"
eval $(fstype "${FS}" 2> /dev/null)
if [ "$FSTYPE" = "unknown" ]; then
FSTYPE=$(blkid -o value -s TYPE "${FS}")
fi
RET=$?
if [ -z "${FSTYPE}" ]; then
FSTYPE="unknown"
fi
echo "${FSTYPE}"
return ${RET}
}
all_netbootable_devices()
{
for device in /sys/class/net/* ; do
if [ ! -e $device/flags ]; then
continue
fi
loop=$(($(cat $device/flags) & 0x8 && 1 || 0))
bc=$(($(cat $device/flags) & 0x2 && 1 || 0))
ptp=$(($(cat $device/flags) & 0x10 && 1 || 0))
# Skip any device that is a loopback
if [ $loop = 1 ]; then
continue
fi
# Skip any device that isn't a broadcast
# or point-to-point.
if [ $bc = 0 ] && [ $ptp = 0 ]; then
continue
fi
DEVICE="$DEVICE $(basename $device)"
done
echo $DEVICE
}
configure_networking()
{
if [ -n "${BOOTIF}" ]; then
# pxelinux sets BOOTIF to a value based on the mac address of the
# network card used to PXE boot, so use this value for DEVICE rather
# than a hard-coded device name from initramfs.conf. this facilitates
# network booting when machines may have multiple network cards.
# pxelinux sets BOOTIF to 01-$mac_address
# strip off the leading "01-", which isn't part of the mac
# address
temp_mac=${BOOTIF#*-}
# convert to typical mac address format by replacing "-" with ":"
bootif_mac=""
IFS='-'
for x in $temp_mac ; do
if [ -z "$bootif_mac" ]; then
bootif_mac="$x"
else
bootif_mac="$bootif_mac:$x"
fi
done
unset IFS
# look for devices with matching mac address, and set DEVICE to
# appropriate value if match is found.
for device in /sys/class/net/* ; do
if [ -f "$device/address" ]; then
current_mac=$(cat "$device/address")
if [ "$bootif_mac" = "$current_mac" ]; then
DEVICE=${device##*/}
DEVICE6=${device##*/}
break
fi
fi
done
fi
wait_for_udev 10
# support ip options see linux sources
# Documentation/filesystems/nfs/nfsroot.txt
# Documentation/frv/booting.txt
for ROUNDTTT in 2 3 4 6 9 16 25 36 64 100; do
# The NIC is to be configured if this file does not exist.
# Ip-Config tries to create this file and when it succeds
# creating the file, ipconfig is not run again.
for x in /run/net-"${DEVICE}".conf /run/net-*.conf ; do
if [ -e "$x" ]; then
IP=done
break
fi
done
for x in /run/net6-"${DEVICE}".conf /run/net6-*.conf ; do
if [ -e "$x" ]; then
IP6=done
break
fi
done
# if we've reached a point where both IP and IP6 are "done",
# then we're finished with network configuration.
if [ "$IP" = done ] && [ "$IP6" = done ]; then
break
fi
case ${IP} in
none|done|off)
# Do nothing
IP=done
;;
""|on|any)
# Bring up device
ipconfig -t ${ROUNDTTT} "${DEVICE}"
;;
dhcp|bootp|rarp|both)
ipconfig -t ${ROUNDTTT} -c ${IP} -d "${DEVICE}"
;;
*)
ipconfig -t ${ROUNDTTT} -d $IP
# grab device entry from ip option
NEW_DEVICE=${IP#*:*:*:*:*:*}
if [ "${NEW_DEVICE}" != "${IP}" ]; then
NEW_DEVICE=${NEW_DEVICE%%:*}
else
# wrong parse, possibly only a partial string
NEW_DEVICE=
fi
if [ -n "${NEW_DEVICE}" ]; then
DEVICE="${NEW_DEVICE}"
fi
;;
esac
case ${IP6} in
""|none|done|off)
# Do nothing
IP6=done
;;
*)
# if this is not the first loop, sleep to provide the backoff.
[ "$(($ROUNDTTT-2))" = "0" ] || sleep $ROUNDTTT
# check the content of IP6, if we have something other
# than a device name there and BOOTIF isn't set, clear
# DEVICE6 and we'll try all available devices.
if echo "${IP6}" | grep -v '^\(on\|dhcp\|any\)$'; then
DEVICE6="$IP6"
fi
# if we don't have a device specified, try to bring up
# any eligible device.
if [ -z "${DEVICE6}" ]; then
DEVICE6=$(all_netbootable_devices)
fi
# Bring up device
for dev in ${DEVICE6} ; do
dhclient -6 -1 -v "${dev}"
done
DEVICE6=$dev
;;
esac
done
# source ipconfig output for either $DEVICE or the first one.
# If the user is booting with only IPv6, then DEVICE may be set,
# but no IPv4 conf files exist.
for conf in /run/net-${DEVICE}.conf /run/net-*.conf; do
if [ -e "${conf}" ]; then
# source specific bootdevice
. ${conf}
break
fi
done
netinfo_to_resolv_conf /etc/resolv.conf \
/run/net-${DEVICE}.conf /run/net-*.conf /run/net6-*.conf
}
netinfo_to_resolv_conf() {
# netinfo_to_resolv_conf(output, files)
# write resolv_conf from /run/net-<device> style files.
if [ "${_in_subshell:-0}" = "0" ]; then
# subshell to avoid modification of variables by '.'
( _in_subshell=1; netinfo_to_resolv_conf "$@" )
return
fi
local output="$1" search="" ns="" f="" n=""
shift
{
for f in "$@"; do
[ -f "$f" ] || continue
unset IPV4DNS0 IPV4DNS1 IPV6DNS0 IPV6DNS1
unset DOMAINSEARCH IPV6DOMAINSEARCH
. "$f" || { echo "WARN: failed '. \"$f\"'" 1>&2; return 1; }
for n in "${IPV4DNS0}" "${IPV4DNS1}" \
"${IPV6DNS0}" "${IPV6DNS1}"; do
[ -n "$n" -a "$n" != "0.0.0.0" ] || continue
# skip if 'n' already in list.
case " ${ns} " in
*\ $n\ *) continue;;
esac
ns="${ns} ${n}"
done
for n in "${DOMAINSEARCH}" "${IPV6DOMAINSEARCH}"; do
[ -n "$n" ] || continue
# skip if already in search.
case " ${search}" in
*\ $n\ *) continue;;
esac
search="$search $n"
done
search=${search# }
ns=${ns# }
done
for n in ${ns}; do
echo "nameserver $n"
done
if [ -n "${search}" ]; then
echo "search ${search}"
fi
} > "$output"
}
# Wait for queued kernel/udev events
wait_for_udev()
{
command -v udevadm >/dev/null 2>&1 || return 0
udevadm settle ${1:+--timeout=$1}
}
# Find a specific fstab entry
# $1=mountpoint
# $2=fstype (optional)
# returns 0 on success, 1 on failure (not found or no fstab)
read_fstab_entry() {
# Not found by default.
found=1
for file in ${rootmnt}/etc/fstab; do
if [ -f "$file" ]; then
while read MNT_FSNAME MNT_DIR MNT_TYPE MNT_OPTS MNT_FREQ MNT_PASS MNT_JUNK; do
case "$MNT_FSNAME" in
""|\#*)
continue;
;;
esac
if [ "$MNT_DIR" = "$1" ]; then
if [ -n "$2" ]; then
[ "$MNT_TYPE" = "$2" ] || continue;
fi
found=0
break 2
fi
done < "$file"
fi
done
return $found
}
# Resolve device node from a name. This expands any LABEL or UUID.
# $1=name
# Resolved name is echoed.
resolve_device() {
DEV="$1"
local orig="$DEV"
case "$DEV" in
LABEL=* | UUID=* | PARTLABEL=* | PARTUUID=*)
DEV="$(blkid -l -t "$DEV" -o device)"
if [ "$?" != 0 ]; then
DEV="$orig"
# Support uppercase and lowercase UUIDs -- see RFC#4122:
# "Each field is treated as an integer and has its value printed as
# a zero-filled hexadecimal digit string with the most significant
# digit first. The hexadecimal values "a" through "f" are output as
# lower case characters and are case insensitive on input."
#
# Note: that blkid which we will use to map these assums the input is lower
# case.
# Only apply this behaviour to UUIDs.
case "$DEV" in
UUID=* | PARTUUID=*) ;;
*) return 1 ;;
esac
# Pull DEV appart and map it.
local type=$(echo ${DEV} | cut -f 1 -d =)
local value=$(echo ${DEV} | cut -f 2 -d = | tr '[A-F]' '[a-f]')
# ... in RFC#4122 format;
# look for five hexadecimal fragments separated by minus signs.
local fmt=$( echo "$value" | sed -e 's/[0-9a-fA-F]*//g' )
if [ "$fmt" != '----' ]; then
return 1
fi
DEV="${type}=${value}"
# Retry with the lower cased UUID.
DEV="$(blkid -l -t "$DEV" -o device)" || return 1
fi
;;
esac
[ -e "$DEV" ] && echo "$DEV"
}
# Check a file system.
# $1=device
# $2=mountpoint (for diagnostics only)
# $3=type (may be "auto")
_checkfs_once()
{
DEV="$1"
NAME="$2"
TYPE="$3"
if [ "$NAME" = "/" ] ; then
NAME="root"
fi
FSCK_LOGFILE=/run/initramfs/fsck.log
FSCK_STAMPFILE=/run/initramfs/fsck-${NAME#/}
if [ "${TYPE}" = "auto" ]; then
TYPE="$(get_fstype "${DEV}")"
fi
FSCKCODE=0
if ! command -v fsck >/dev/null 2>&1; then
log_warning_msg "fsck not present, so skipping $NAME file system"
return
fi
if [ "$fastboot" = "y" ] ; then
log_warning_msg "Fast boot enabled, so skipping $NAME file system check."
return
fi
if [ "$forcefsck" = "y" ]
then
force="-f"
else
force=""
fi
if [ "$fsckfix" = "y" ]
then
fix="-y"
elif [ "$fsckfix" = "n" ]
then
fix="-n"
else
fix="-a"
fi
spinner=""
if [ -z "${debug}" ]; then
spinner="-C"
fi
if [ "${quiet}" = n ]
then
log_begin_msg "Will now check $NAME file system"
logsave -a -s $FSCK_LOGFILE fsck $spinner $force $fix -V -t $TYPE $DEV
FSCKCODE=$?
log_end_msg
else
log_begin_msg "Checking $NAME file system"
logsave -a -s $FSCK_LOGFILE fsck $spinner $force $fix -T -t $TYPE $DEV
FSCKCODE=$?
log_end_msg
fi
# NOTE: "failure" is defined as exiting with a return code of
# 4, possibly or-ed with other flags. A return code of 1
# indicates that file system errors were corrected but that
# the boot may proceed.
#
if [ "$FSCKCODE" -eq 32 ]
then
log_warning_msg "File system check was interrupted by user"
elif [ $((FSCKCODE & 4)) -eq 4 ]
then
log_failure_msg "File system check of the $NAME filesystem failed"
return 1
elif [ "$FSCKCODE" -gt 1 ]
then
log_warning_msg "File system check failed but did not detect errors"
sleep 5
else
> $FSCK_STAMPFILE
fi
return 0
}
checkfs()
{
while ! _checkfs_once "$@"; do
panic "The $2 filesystem on $1 requires a manual fsck"
done
}
# Mount a file system. We parse the information from the fstab. This
# should be overridden by any boot script which can mount arbitrary
# filesystems such as /usr. This default implementation delegates to
# local or nfs based upon the filesystem type.
# $1=mountpoint mount location
mountfs()
{
type=local
read_fstab_entry "$1"
if [ "${MNT_TYPE}" = "nfs" ] || [ "${MNT_TYPE}" = "nfs4" ]; then
type=nfs
fi
${type}_mount_fs "$1"
}
# Mount the root file system. It should be overridden by all
# boot scripts.
mountroot()
{
:
}
# Run /scripts/${boot}-top. This should be overridden by all boot
# scripts.
mount_top()
{
:
}
# Run /scripts/${boot}-premount. This should be overridden by all boot
# scripts.
mount_premount()
{
:
}
# Run /scripts/${boot}-bottom. This should be overridden by all boot
# scripts.
mount_bottom()
{
:
}
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