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functions.sh
executable file
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functions.sh
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#!/bin/sh
# better-initramfs project
# https://bitbucket.org/piotrkarbowski/better-initramfs
# Copyright (c) 2010-2018, Piotr Karbowski <piotr.karbowski@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the Piotr Karbowski nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE
einfo() { echo -ne "\033[1;30m>\033[0;36m>\033[1;36m> \033[0m${*}\n" ;}
ewarn() { echo -ne "\033[1;30m>\033[0;33m>\033[1;33m> \033[0m${*}\n" >&2;}
eerror() { echo -ne "\033[1;30m>\033[0;31m>\033[1;31m> ${*}\033[0m\n" >&2 ;}
die() { eerror "$*"; rescueshell; }
InitializeBusybox() {
einfo "Create all the symlinks to /bin/busybox."
run /bin/busybox --install -s
}
rescueshell() {
if [ "${console}" ]; then
console="${console%,*}"
fi
if [ "$rescueshell" != 'true' ]; then
# If we did not forced rescueshell by kernel opt, print additional message.
ewarn "Dropping to rescueshell because of above error."
fi
ewarn "Rescue Shell (busybox's /bin/sh)"
ewarn "To reboot, press 'control-alt-delete'."
ewarn "If you wish resume booting process, run 'resume-boot'."
if [ "$console" ] && [ -c "/dev/${console}" ]; then
setsid sh -c "exec sh --login </dev/"${console}" >/dev/${console} 2>&1"
elif command -v cttyhack 1>/dev/null 2>&1; then
setsid cttyhack sh --login
elif [ -c '/dev/tty1' ]; then
setsid sh -c 'exec sh --login </dev/tty1 >/dev/tty1 2>&1'
else
sh --login
fi
echo
:> /rescueshell.pid
}
was_shell() {
[ -f '/rescueshell.pid' ]
return $?
}
run() {
if "$@"; then
echo "Executed: '$@'" >> /init.log
else
eerror "'$@' failed."
echo "Failed: '$@'" >> /init.log
echo "$@" >> /.ash_history
rescueshell
fi
}
run_hooks() {
# Support for optional code injection via hooks placed into
# multiple initramfs images.
if [ -d "/hooks/$1" ]; then
for i in /hooks/$1/*; do
[ "$i" = "/hooks/$1/*" ] && break
einfo "Running '$i' hook ..."
[ -x "$i" ] && . "$i"
done
fi
}
populate_dev_disk_by_label_and_uuid() {
# Create /dev/disk/by-{uuid,label} symlinks.
# We could run it with mdev as a trigger on event,
# but binit uses devtmpfs by default.
# It is possible that later whatever manages /dev
# will not probe block device and create symlinks,
# so we should do it before we move /dev to /newroot/dev
# Fix for an issue reported under Gentoo's bug #559026.
local block_device blkid_output LABEL UUID TYPE
local vars
einfo "Populating /dev/disk/by-{uuid,label} ..."
dodir /dev/disk /dev/disk/by-uuid /dev/disk/by-label
for block_device in /sys/class/block/*; do
unset blkid_output LABEL UUID TYPE
block_device="${block_device##*/}"
blkid_output="$(blkid "/dev/${block_device}")"
[ "${blkid_output}" ] || continue
vars="${blkid_output#*:}"
eval "${vars}"
[ "${LABEL}" ] && ! [ -e "/dev/disk/by-label/${LABEL}" ] && run ln -s "../../${block_device}" "/dev/disk/by-label/${LABEL}"
[ "${UUID}" ] && ! [ -e "/dev/disk/by-uuid/${UUID}" ] && run ln -s "../../${block_device}" "/dev/disk/by-uuid/${UUID}"
done
}
resolve_device() {
# This function will check if variable at $1 contain LABEL or UUID and then, if LABEL/UUID is valid.
eval "device=\"\$$1\""
case "${device}" in
LABEL\=*|UUID\=*)
eval "$1=\"$(findfs $device)\""
if eval "[ -z \"\$$1\" ]"; then
eerror "Wrong UUID or LABEL."
rescueshell
fi
;;
esac
}
process_commandline_options() {
for i in $(cat /proc/cmdline); do
case "${i}" in
initramfsdebug)
set -x
;;
ro|rw)
root_rw_ro=$i
;;
binit_net_route\=*)
# support multiple binit_net_route=.
binit_net_routes="${binit_net_routes} ${i#*=}"
;;
*=*)
# Catch-all for foo=bar.
# And ignore foo.bar=1 etc.
case "${i%%=*}" in
*'.'*)
true
;;
*)
export "${i%%=*}=${i#*=}"
;;
esac
;;
*.*)
# ignore foo.bar
true
;;
*)
# Everything that is not foo=bar should be just exported as 'true'
export "${i}=true"
:;
esac
done
}
use() {
eval "name=\"\$$1\""
# Check if $name isn't empty and if $name isn't set to false or zero.
if [ -n "${name}" ] && [ "${name}" != 'false' ] && [ "${name}" != '0' ]; then
if [ -n "$2" ]; then
$2
else
return 0
fi
else
return 1
fi
}
musthave() {
while [ -n "$1" ]; do
# We can handle it by use() function, yay!
if ! use "$1"; then
eerror "The \"$1\" variable is empty, set to false or zero but shoudn't be."
local missing_variable='true'
fi
shift
done
if [ "${missing_variable}" = 'true' ]; then
rescueshell
fi
}
dodir() {
for dir in "$@"; do
run mkdir -m 700 -p "${dir}"
done
}
loadkeymap() {
if [ -f /keymap ]; then
loadkmap < /keymap
fi
}
get_majorminor() {
local device="$1"
musthave device
local major_hex="$(stat -L -c '%t' "${device}")"
local minor_hex="$(stat -L -c '%T' "${device}")"
musthave major_hex minor_hex
if [ -n "${major_hex}" ] && [ -n "${minor_hex}" ]; then
printf '%u:%u\n' "0x${major_hex}" "0x${minor_hex}"
fi
}
InitializeLUKS() {
if ! command -v cryptsetup 1>/dev/null 2>&1; then
eerror "There is no cryptsetup binary into initramfs image."
rescueshell
fi
musthave enc_root
local enc_num='1'
local dev_name="enc_root"
# We will use : to separate devices but we need normal IFS inside the for loop anyway.
local IFS=":"
for enc_dev in ${enc_root}; do
IFS="${default_ifs}"
if ! [ "${enc_num}" = '1' ]; then
dev_name="enc_root${enc_num}"
fi
resolve_device enc_dev
einfo "Opening encrypted partition '${enc_dev##*/}' and mapping to '/dev/mapper/${dev_name}'."
# Hack for cryptsetup which trying to run /sbin/udevadm.
run echo -e "#!/bin/sh\nexit 0" > /sbin/udevadm
run chmod 755 /sbin/udevadm
local cryptsetup_args=""
if ! use luks_no_discards; then
cryptsetup_args="${cryptsetup_args} --allow-discards"
fi
if use sshd; then
askpass "Enter passphrase for ${enc_dev}: " | run cryptsetup --tries 1 --key-file=- luksOpen ${cryptsetup_args} "${enc_dev}" "${dev_name}"
# Remove the fifo, askpass will create new if needed (ex multiple devices).
rm '/luks_passfifo'
else
run cryptsetup luksOpen --tries 25 ${cryptsetup_args} "${enc_dev}" "${dev_name}"
fi
enc_num="$((enc_num+1))"
done
}
InitializeLVM() {
einfo "Scaning all disks for volume groups."
# We have to ensure that cache does not exist so vgchange will run 'vgscan' itself.
if [ -d '/etc/lvm/cache' ]; then run rm -rf '/etc/lvm/cache'; fi
run lvm vgchange -a y
}
InitializeSoftwareRaid() {
einfo "Scaning for software raid arrays."
if ! [ -f '/etc/mdadm.conf' ]; then
run mdadm --examine --scan > /etc/mdadm.conf
fi
run mdadm --assemble --scan
# The software raid arrays may have partitions on them.
rereadpt
}
rereadpt() {
# Check for partition table on all block devices.
for i in /dev/*; do
if [ -b "${i}" ]; then
blockdev --rereadpt "${i}" >/dev/null 2>&1
fi
done
}
SwsuspResume() {
musthave resume
resolve_device resume
if [ -f '/sys/power/resume' ]; then
local resume_majorminor="$(get_majorminor "${resume}")"
musthave resume_majorminor
einfo 'Sending resume device to /sys/power/resume ...'
echo "${resume_majorminor}" > /sys/power/resume
else
ewarn "Apparently this kernel does not support suspend."
fi
}
TuxOnIceResume() {
musthave resume
if [ -f '/sys/power/tuxonice/do_resume' ]; then
einfo "Sending do_resume signal to TuxOnIce."
run echo 1 > /sys/power/tuxonice/do_resume
else
ewarn "Apparently this kernel does not support TuxOnIce."
fi
}
register_bcache_devices() {
# Push all the block devices to register_quiet
# If its bcache, it will bring it up, if not, it will simply ignore it.
if ! [ -e /sys/fs/bcache/register_quiet ]; then
ewarn "There's no bcache interface. Missing kernel driver?"
return 0
fi
for i in $(awk '$4 !~ /^(name$|$)/ { print $4 }' /proc/partitions); do
if [ -e "/dev/${i}" ]; then
echo "/dev/${i}" >/sys/fs/bcache/register_quiet
else
echo "Looks like there's no '/dev/${i}', but should be."
fi
done
}
SetupNetwork() {
# Defaults ...
vlan='false'
# backward compatibility
if [ "${sshd_interface}" ]; then
ewarn "sshd_interface is deprecated, check README"
ewarn "and switch to binit_net_if!"
binit_net_if="${sshd_interface}"
binit_net_addr="${sshd_ipv4}"
binit_net_gw="${sshd_ipv4_gateway}"
fi
# setting _interface is the trigger.
# after dropping backward compatibility there should be
# a 'use FOO && SetupNetwork' in init script.
use binit_net_if || return
musthave binit_net_addr
run ip link set up dev lo
case "${binit_net_if}" in
*'.'*)
vlan='true'
binit_net_physif="${binit_net_if%%.*}"
local binit_net_vlan="${binit_net_if##*.}"
einfo "Bringing up ${binit_net_physif} interface ..."
run ip link set up dev "${binit_net_physif}"
einfo "Adding VLAN ${binit_net_vlan} on ${binit_net_physif} interface ..."
run vconfig add "${binit_net_physif}" "${binit_net_vlan}"
;;
esac
einfo "Bringing up ${binit_net_if} interface ..."
run ip link set up dev "${binit_net_if}"
if [ "${binit_net_addr}" = 'dhcp' ]; then
einfo "Using DHCP on ${binit_net_if} ..."
run udhcpc -i "${binit_net_if}" -s /bin/dhcp-query -q -f
. /dhcp-query-result
fi
einfo "Setting ${binit_net_addr} on ${binit_net_if} ..."
run ip addr add "${binit_net_addr}" dev "${binit_net_if}"
if [ -n "${binit_net_routes}" ]; then
for route in ${binit_net_routes}; do
einfo "Adding additional route '${route}' ..."
run ip route add "${route}" dev "${binit_net_if}"
done
fi
if [ -n "${binit_net_gw}" ]; then
einfo "Setting default routing via '${binit_net_gw}' ..."
run ip route add default via "${binit_net_gw}" dev "${binit_net_if}"
fi
}
setup_sshd() {
# Prepare /dev/pts.
einfo "Mounting /dev/pts ..."
if ! [ -d /dev/pts ]; then run mkdir /dev/pts; fi
run mount -t devpts none /dev/pts
# Prepare dirs.
dodir /etc/dropbear /var/log /var/run /root/.ssh
# Generate host keys.
einfo "Generating dropbear ssh host keys ..."
test -f /etc/dropbear/dropbear_rsa_host_key || \
run dropbearkey -t rsa -f /etc/dropbear/dropbear_rsa_host_key > /dev/null
test -f /etc/dropbear/dropbear_dss_host_key || \
run dropbearkey -t dss -f /etc/dropbear/dropbear_dss_host_key > /dev/null
# Prepare root account.
run echo 'root:x:0:0:root:/root:/bin/sh' > /etc/passwd
if [ -f /authorized_keys ]; then
run cp /authorized_keys /root/.ssh/authorized_keys
else
eerror "Missing /authorized_keys file, you will be no able login via sshd."
rescueshell
fi
einfo 'Starting dropbear sshd ...'
run dropbear -s -p "${binit_net_addr%/*}:${sshd_port:-22}"
}
wait_sshd() {
if use sshd_wait; then
# sshd_wait exist, now we should sleep for X sec.
if [ "${sshd_wait}" -gt 0 2>/dev/null ]; then
einfo "Waiting ${sshd_wait}s (sshd_wait)"
while [ ${sshd_wait} -gt 0 ]; do
[ -f '/remote-rescueshell.lock' ] && break
sshd_wait=$((sshd_wait - 1))
sleep 1
done
else
ewarn "\$sshd_wait variable must be numeric and greater than zero. Skipping sshd_wait."
fi
fi
}
cleanup() {
if use binit_net_if; then
if [ -f '/remote-rescueshell.lock' ]; then
ewarn "The lockfile at '/remote-rescueshell.lock' exist."
ewarn "The boot process will be paused until the lock is removed."
while true; do
if [ -f '/remote-rescueshell.lock' ]; then
sleep 1
else
break
fi
done
fi
fi
was_shell && rm /rescueshell.pid
if use sshd; then
run pkill -9 dropbear > /dev/null 2>&1
fi
if use binit_net_if; then
run ip addr flush dev "${binit_net_if}"
run ip route flush dev "${binit_net_if}"
run ip link set down dev "${binit_net_if}"
if use vlan; then
run ip link del "${binit_net_if}"
run ip link set down dev "${binit_net_physif}"
fi
fi
}
boot_newroot() {
init="${init:-/sbin/init}"
einfo "Switching root to /newroot and executing ${init}."
if ! [ -x "/newroot/${init}" ]; then die "There is no executable '/newroot/${init}'."; fi
exec env -i \
TERM="${TERM:-linux}" \
PATH="${PATH:-/bin:/sbin:/usr/bin:/usr/sbin}" \
switch_root /newroot "${init}"
}
emount() {
# All mounts into one place is good idea.
local mountparams
while [ "$#" -gt 0 ]; do
case $1 in
'/newroot')
if mountpoint -q '/newroot'; then
einfo "/newroot already mounted, skipping..."
else
einfo "Mounting /newroot..."
musthave root
if [ -n "${rootfstype}" ]; then
mountparams="${mountparams} -t ${rootfstype}"
fi
resolve_device root
run mount -o "${rootflags:+${rootflags},}${root_rw_ro:-ro}" ${mountparams} "${root}" '/newroot'
fi
;;
'/newroot/usr')
if [ -f '/newroot/etc/fstab' ]; then
while read device mountpoint fstype fsflags _; do
if [ "${mountpoint}" = '/usr' ]; then
if [ -d '/newroot/usr' ]; then
einfo "Mounting /newroot/usr..."
run mount -o "${fsflags},${root_rw_ro:-ro}" -t "${fstype}" "${device}" '/newroot/usr'
else
die "/usr in fstab present but no mountpoint /newroot/usr found."
fi
break
fi
done < '/newroot/etc/fstab'
else
ewarn "No /newroot/etc/fstab present."
ewarn "Early mouting of /usr will not be done."
fi
;;
'/dev')
local devmountopts='nosuid,relatime,size=10240k,mode=755'
if grep -q 'devtmpfs' '/proc/filesystems' && ! use mdev; then
einfo "Mounting /dev (devtmpfs)..."
run mount -t devtmpfs -o ${devmountopts} devtmpfs /dev
else
einfo "Mounting /dev (mdev over tmpfs)..."
run mount -t tmpfs -o ${devmountopts} dev /dev
run touch /etc/mdev.conf
run echo /sbin/mdev > /proc/sys/kernel/hotplug
run mdev -s
# Looks like mdev create /dev/pktcdvd as a file when both udev and devtmpfs do it as a dir.
# We will do it 'better' to avoid non-fatal-error while starting udev after switching to /newroot.
# TODO: Can mdev.conf handle it?
if [ -c '/dev/pktcdvd' ]; then
run rm '/dev/pktcdvd'
run mkdir '/dev/pktcdvd'
run mknod '/dev/pktcdvd/control' c 10 61
fi
fi
;;
'/proc')
einfo "Mounting /proc..."
run mount -t proc proc /proc
;;
'/sys')
einfo "Mounting /sys..."
run mount -t sysfs sysfs /sys
;;
*)
eerror "emount() does not understand \"$1\""
;;
esac
shift
done
}
eumount() {
while [ "$#" -gt 0 ]; do
case "$1" in
*)
einfo "Unmounting ${1}..."
run umount "$1"
;;
esac
shift
done
}
moveDev() {
einfo "Moving /dev to /newroot/dev..."
if mountpoint -q /dev/pts; then umount -l /dev/pts; fi
if use mdev; then run echo '' > /proc/sys/kernel/hotplug; fi
run mount --move /dev /newroot/dev
}
rootdelay() {
if [ "${rootdelay}" -gt 0 2>/dev/null ]; then
einfo "Waiting ${rootdelay}s (rootdelay)"
run sleep ${rootdelay}
else
ewarn "\$rootdelay variable must be numeric and greater than zero. Skipping rootdelay."
fi
}
# vim: noexpandtab