mirror of
https://github.com/linuxboot/heads.git
synced 2024-12-18 20:47:55 +00:00
262 lines
8.8 KiB
Bash
Executable File
262 lines
8.8 KiB
Bash
Executable File
#! /bin/ash
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# Note this is used on legacy-flash boards that lack bash, it runs with busybox
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# ash. Calls to bash scripts must be guarded by checking config.
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mknod /dev/ttyprintk c 5 3
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echo "hello world" > /dev/ttyprintk
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# Setup our path
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export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin
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# This is the very first script invoked by the Linux kernel and is
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# running out of the ram disk. There are no fileysstems mounted.
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# It is important to have a way to invoke a recovery shell in case
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# the boot scripts are messed up, but also important to modify the
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# PCRs if this happens to prevent the TPM Disk Unlock Keys from being revealed.
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# First thing it is vital to mount the /dev and other system directories
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mkdir /proc /sys /dev /tmp /boot /media 2>&- 1>&-
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mount /dev 2>/dev/ttyprintk
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mount /proc 2>/dev/ttyprintk
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mount /sys 2>/dev/ttyprintk
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if [ "$CONFIG_LINUXBOOT" = "y" ]; then
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mount /sys/firmware/efi/efivars
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fi
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# Setup the pty pseudo filesystem
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mkdir /dev/pts
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mount /dev/pts 2>/dev/ttyprintk
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if [ ! -r /dev/ptmx ]; then
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ln -s /dev/pts/ptmx /dev/ptmx
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fi
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# Needed by bash
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[ -e /dev/stdin ] || ln -s /proc/self/fd/0 /dev/stdin
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[ -e /dev/stdout ] || ln -s /proc/self/fd/1 /dev/stdout
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[ -e /dev/stderr ] || ln -s /proc/self/fd/2 /dev/stderr
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[ -e /dev/fd ] || ln -s /proc/self/fd /dev/fd
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# Recovery shells will erase anything from here
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mkdir -p /tmp/secret
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# Now it is safe to print a banner
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if [ -r /etc/motd ]; then
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cat /etc/motd > /dev/tty0
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fi
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# Load the date from the hardware clock, setting it in local time
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hwclock -l -s
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# When mounting a filesystem, try exFAT last, since it logs errors if the
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# filesystem is not exFAT, and the errors go to the console. Those errors are
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# spurious when the medium is iso9660. By default in our config, the only
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# filesystem after exFAT is iso9660, move exFAT last.
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(grep -v '^\texfat$' /proc/filesystems && echo -e '\texfat') >/etc/filesystems
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# Read the system configuration parameters
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. /etc/ash_functions
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. /etc/config
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# Board config had CONFIG_DEBUG_OUTPUT=y defined.
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# Note that boards's coreboot config kernel command line "debug" option only will have all kernel messages output on console prior of this point
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if [ "$CONFIG_DEBUG_OUTPUT" = "y" ]; then
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#Maximize printk messages to output all to console (8=debug)
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#DEBUG and TRACE calls will output to /dev/kmsg, outputting both on dmesg and on console
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dmesg -n 8 || true
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DEBUG "Debug output enabled from board CONFIG_DEBUG_OUTPUT=y option (/etc/config)"
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else
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# Board config did't have CONFIG_DEBUG_OUTPUT=y defined
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# config.user extracted and combined from CBFS had CONFIG_DEBUG_OUTPUT=y
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# Output only print messages with a priority of 4 (warnings) or lower (errors and critical) kernel messages to console
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# This way, "debug" kernel command line option will have all kernel messages output on console prior of this point
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# This is useful to debug boot issues but permits qemu board to boot without flooding console with kernel messages by disabling CONFIG_DEBUG_OUTPUT=y in qemu board config
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dmesg -n 4 || true
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DEBUG "Debug output enabled from /etc/config.user's CONFIG_DEBUG_OUTPUT=y after combine_configs (Config menu enabled Debug)"
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fi
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TRACE "Under init"
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# make sure we have sysctl requirements
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if [ ! -d /proc/sys ]; then
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warn "BUG!!! The following requirements to apply runtime kernel tweaks are missing:"
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warn "CONFIG_SYSCTL=y"
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warn "CONFIG_PROC_SYSCTL=y"
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warn "Please open an issue"
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fi
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if [ ! -e /proc/sys/vm/panic_on_oom ]; then
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warn "BUG!!! Requirements to setup Panic when under Out Of Memory situation through PROC_SYSCTL are missing (panic_on_oom was not enabled)"
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warn "Please open an issue"
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else
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DEBUG "Applying panic_on_oom setting to sysctl"
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echo 1 > /proc/sys/vm/panic_on_oom
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fi
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# set CONFIG_TPM dynamically before init
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if [ ! -e /dev/tpm0 ]; then
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CONFIG_TPM='n'
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CONFIG_TPM2_TOOLS='n'
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fi
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#Specify whiptail background colors cues under FBWhiptail only
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if [ -x /bin/fbwhiptail ]; then
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export BG_COLOR_WARNING="${CONFIG_WARNING_BG_COLOR:-"--background-gradient 0 0 0 150 125 0"}"
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export BG_COLOR_ERROR="${CONFIG_ERROR_BG_COLOR:-"--background-gradient 0 0 0 150 0 0"}"
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else
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export TEXT_BG_COLOR_WARNING="${CONFIG_WARNING_TEXT_BG_COLOR:-"yellow"}"
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export TEXT_BG_COLOR_ERROR="${CONFIG_ERROR_TEXT_BG_COLOR:-"red"}"
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fi
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if [ "$CONFIG_TPM" = "y" ]; then
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# Initialize tpm2 encrypted sessions here
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tpmr startsession
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fi
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if [ "$CONFIG_COREBOOT" = "y" ]; then
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[ -x /bin/bash ] && /bin/cbfs-init
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fi
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if [ "$CONFIG_LINUXBOOT" = "y" ]; then
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/bin/uefi-init
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fi
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# Set GPG_TTY before calling gpg in key-init
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export GPG_TTY=/dev/console
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# Initialize gpnupg with distro/user keys and setup the keyrings
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[ -x /bin/bash ] && /bin/key-init
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# Override CONFIG_USE_BLOB_JAIL if needed and persist via user config
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if lspci -n | grep -E -q "8086:(2723|4df0)"; then
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if ! cat /etc/config.user 2>/dev/null | grep -q "USE_BLOB_JAIL"; then
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echo "CONFIG_USE_BLOB_JAIL=y" >> /etc/config.user
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fi
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fi
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# Override CONFIG_TPM and CONFIG_TPM2_TOOLS from /etc/config with runtime value
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# determined above.
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#
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# Values in user config have higher priority during combining thus effectively
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# changing the value for the rest of the scripts which source /tmp/config.
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#Only set CONFIG_TPM and CONFIG_TPM2_TOOLS if they are not already set in /etc/config.user
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if ! grep -q 'CONFIG_TPM=' /etc/config.user; then
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echo "export CONFIG_TPM=\"$CONFIG_TPM\"" >> /etc/config.user
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fi
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if ! grep -q 'CONFIG_TPM2_TOOLS=' /etc/config.user; then
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echo "export CONFIG_TPM2_TOOLS=\"$CONFIG_TPM2_TOOLS\"" >> /etc/config.user
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fi
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# CONFIG_BASIC was previously CONFIG_PUREBOOT_BASIC in the PureBoot distribution.
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# Substitute it in config.user if present for backward compatibility.
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sed -i -e 's/^export CONFIG_PUREBOOT_BASIC=/export CONFIG_BASIC=/g' /etc/config.user
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combine_configs
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. /tmp/config
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# Enable maximum debug info from here if config.user extracted and combined from CBFS had CONFIG_DEBUG_OUTPUT=y
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if [ "$CONFIG_DEBUG_OUTPUT" = "y" ]; then
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#Output all kernel messages to console (8=debug)
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#DEBUG and TRACE calls will be in dmesg and on console
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if ! grep -q 'CONFIG_DEBUG_OUTPUT="y"' /etc/config;then
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# Board config did't have CONFIG_DEBUG_OUTPUT=y defined
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# config.user extracted and combined from CBFS had CONFIG_DEBUG_OUTPUT=y
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dmesg -n 8
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DEBUG "Debug output enabled from /etc/config.user's CONFIG_DEBUG_OUTPUT=y after combine_configs (Config menu enabled Debug)"
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TRACE "Under init:after combine_configs"
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fi
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fi
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# Setup recovery serial shell
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if [ ! -z "$CONFIG_BOOT_RECOVERY_SERIAL" ]; then
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stty -F "$CONFIG_BOOT_RECOVERY_SERIAL" 115200
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pause_recovery 'Console recovery shell' \
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< "$CONFIG_BOOT_RECOVERY_SERIAL" \
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> "$CONFIG_BOOT_RECOVERY_SERIAL" 2>&1 &
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fi
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# load USB modules for boards using a USB keyboard
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if [ "$CONFIG_USB_KEYBOARD_REQUIRED" = y ] || [ "$CONFIG_USER_USB_KEYBOARD" = "y" ]; then
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enable_usb
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fi
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# If the user has been holding down r, enter a recovery shell
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# otherwise immediately start the configured boot script.
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# We don't print a prompt, since this is a near instant timeout.
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read \
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-t 0.1 \
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-n 1 \
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boot_option
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echo
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if [ "$boot_option" = "r" ]; then
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# Start an interactive shell
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recovery 'User requested recovery shell'
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# just in case...
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exit
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elif [ "$boot_option" = "o" ]; then
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# Launch OEM Factory Reset/Re-Ownership
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oem-factory-reset
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# just in case...
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exit
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fi
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if [ "$CONFIG_BASIC" = "y" ]; then
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echo -e "***** BASIC mode: tamper detection disabled\n" > /dev/tty0
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fi
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# export firmware version
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export FW_VER=$(fw_version)
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# Add our boot devices into the /etc/fstab, if they are defined
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# in the configuration file.
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if [ ! -z "$CONFIG_BOOT_DEV" ]; then
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echo >> /etc/fstab "$CONFIG_BOOT_DEV /boot auto defaults,ro 0 0"
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fi
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# Set the console font if needed
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[ -x /bin/bash ] && setconsolefont.sh
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if [ "$CONFIG_BASIC" = "y" ]; then
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CONFIG_BOOTSCRIPT=/bin/gui-init-basic
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export CONFIG_HOTPKEY=n
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fi
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# Perform board-specific init if present
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if [ -x /bin/board-init.sh ]; then
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/bin/board-init.sh
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fi
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if [ ! -x "$CONFIG_BOOTSCRIPT" -a ! -x "$CONFIG_BOOTSCRIPT_NETWORK" ]; then
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recovery 'Boot script missing? Entering recovery shell'
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else
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if [ -x "$CONFIG_BOOTSCRIPT_NETWORK" ]; then
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echo '***** Network Boot:' $CONFIG_BOOTSCRIPT_NETWORK
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$CONFIG_BOOTSCRIPT_NETWORK
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echo '***** Network Boot Completed:' $CONFIG_BOOTSCRIPT_NETWORK
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# not blocking
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fi
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if [ -x "$CONFIG_BOOTSCRIPT" ]; then
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echo '***** Normal boot:' $CONFIG_BOOTSCRIPT
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if [ -x /bin/setsid ] && [ -x /bin/agetty ]; then
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for console in $CONFIG_BOOT_EXTRA_TTYS; do
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setsid agetty -aroot -l"$CONFIG_BOOTSCRIPT" "$console" linux &
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done
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fi
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#Setup a control tty so that all terminals outputs correct tty when tty is called
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exec cttyhack "$CONFIG_BOOTSCRIPT"
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else
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# wait for boot via network to occur
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pause_recovery 'Override network boot. Entering recovery shell'
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fi
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fi
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# We should never reach here, but just in case...
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recovery 'Boot script failure? Entering recovery shell'
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