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#!/usr/bin/ash
# SPDX-License-Identifier: GPL-2.0-only
export PATH='/usr/local/sbin:/usr/local/bin:/usr/bin'
udevd_running=0
mount_handler=default_mount_handler
init=/sbin/init
rd_logmask=0
. /init_functions
mount_setup
# parse the kernel command line
parse_cmdline </proc/cmdline
# setup logging as early as possible
rdlogger_start
# busybox ash supports string replacements
# shellcheck disable=SC3060
# assigned by parse_cmdline
# shellcheck disable=SC2154
for d in ${disablehooks//,/ }; do
[ -e "/hooks/$d" ] && chmod 644 "/hooks/$d"
done
# shellcheck disable=SC1091
. /config
# We rely on word splitting
# shellcheck disable=SC2086
run_hookfunctions 'run_earlyhook' 'early hook' $EARLYHOOKS
if [ -n "$earlymodules$MODULES" ]; then
# busybox ash supports string replacements
# shellcheck disable=SC3060,SC2086
modprobe -qab ${earlymodules//,/ } $MODULES
fi
# We rely on word splitting
# shellcheck disable=SC2086
run_hookfunctions 'run_hook' 'hook' $HOOKS
# honor the old behavior of break=y as a synonym for break=premount
# assigned by parse_cmdline
# shellcheck disable=SC2154
if [ "${break}" = "y" ] || [ "${break}" = "premount" ]; then
# shellcheck disable=SC2086
run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
echo ":: Pre-mount break requested, type 'exit' to resume operation"
launch_interactive_shell
fi
if rootdev="$(resolve_device "$root")"; then
# If the tag is supported by util-linux mount, pass it as is.
# Otherwise, use the resolved device path.
case "$root" in
'UUID='* | 'LABEL='* | 'PARTUUID='* | 'PARTLABEL='*) : ;;
*) root="$rootdev" ;;
esac
fi
unset rootdev
fsck_root
# Mount root at /new_root
"$mount_handler" /new_root
# We rely on word splitting
# shellcheck disable=SC2086
run_hookfunctions 'run_latehook' 'late hook' $LATEHOOKS
# We rely on word splitting
# shellcheck disable=SC2086
run_hookfunctions 'run_cleanuphook' 'cleanup hook' $CLEANUPHOOKS
if [ "$(stat -c %D /)" = "$(stat -c %D /new_root)" ]; then
# Nothing got mounted on /new_root. This is the end, we don't know what to do anymore
# We fall back into a shell, but the shell has now PID 1
# This way, manual recovery is still possible.
# shellcheck disable=SC2086
run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
err "Failed to mount the real root device."
echo "Bailing out, you are on your own. Good luck."
echo
launch_interactive_shell --exec
elif [ ! -x "/new_root${init}" ]; then
# Successfully mounted /new_root, but ${init} is missing
# The same logic as above applies
# shellcheck disable=SC2086
run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
err "Root device mounted successfully, but ${init} does not exist."
echo "Bailing out, you are on your own. Good luck."
echo
launch_interactive_shell --exec
fi
if [ "${break}" = "postmount" ]; then
# shellcheck disable=SC2086
run_hookfunctions 'run_emergencyhook' 'emergency hook' $EMERGENCYHOOKS
echo ":: Post-mount break requested, type 'exit' to resume operation"
launch_interactive_shell
fi
# this should always be the last thing we do before the switch_root.
rdlogger_stop
exec env -i \
"TERM=$TERM" \
/usr/bin/switch_root /new_root "$init" "$@"
# vim: set ft=sh ts=4 sw=4 et:
|
