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Add USB autoboot feature to PureBoot Basic
USB autoboot automatically boots to a USB flash drive if one is present during boot. This is intended for headless deployments as a method to recover the installed operating system from USB without needing to attach a display and keyboard. USB autoboot can be controlled in config.user and the config GUI. Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
This commit is contained in:
Jonathon Hall
parent
b0e0a91c97
commit
206d59dc71
@ -32,6 +32,7 @@ while true; do
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# check current Restricted Boot Mode
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RESTRICTED_BOOT="$(load_config_value CONFIG_RESTRICTED_BOOT)"
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BASIC_NO_AUTOMATIC_DEFAULT="$(load_config_value CONFIG_BASIC_NO_AUTOMATIC_DEFAULT)"
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BASIC_USB_AUTOBOOT="$(load_config_value CONFIG_BASIC_USB_AUTOBOOT)"
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dynamic_config_options=()
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@ -39,6 +40,7 @@ while true; do
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dynamic_config_options+=( \
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'P' " $(get_config_display_action "$BASIC_MODE") PureBoot Basic Mode" \
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'A' " $(get_inverted_config_display_action "$BASIC_NO_AUTOMATIC_DEFAULT") automatic default boot" \
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'U' " $(get_config_display_action "$BASIC_USB_AUTOBOOT") USB automatic boot" \
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)
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else
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dynamic_config_options+=( \
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@ -362,6 +364,32 @@ while true; do
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fi
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fi
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;;
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"U" )
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if [ "$BASIC_USB_AUTOBOOT" = "n" ]; then
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if (whiptail --title 'Enable USB automatic boot?' \
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--yesno "During boot, an attached bootable USB disk will be booted
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\nby default instead of the installed operating system.
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\n\nDo you want to proceed?" 0 80) then
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set_config /etc/config.user "CONFIG_BASIC_USB_AUTOBOOT" "y"
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combine_configs
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whiptail --title 'Config change successful' \
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--msgbox "USB automatic boot enabled;\nsave the config change and reboot for it to go into effect." 0 80
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fi
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else
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if (whiptail --title 'Disable USB automatic boot?' \
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--yesno "USB disks will no longer be booted by default.
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\n\nDo you want to proceed?" 0 80) then
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set_config /etc/config.user "CONFIG_BASIC_USB_AUTOBOOT" "n"
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combine_configs
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whiptail --title 'Config change successful' \
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--msgbox "USB automatic boot disabled;\nsave the config change and reboot for it to go into effect." 0 80
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fi
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fi
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;;
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esac
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done
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@ -64,20 +64,11 @@ mount_boot()
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prompt_auto_default_boot()
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{
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TRACE "Under /bin/gui-init:prompt_auto_default_boot"
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# save IFS before changing, restore after read
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IFS_DEF=$IFS
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IFS=''
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first_pass=false
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echo -e "\n\n"
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read -t $CONFIG_AUTO_BOOT_TIMEOUT -s -n 1 -p "Automatic boot in $CONFIG_AUTO_BOOT_TIMEOUT seconds unless interrupted by keypress... "
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if [[ $? -ne 0 ]]; then
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IFS=$IFS_DEF
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if pause_automatic_boot; then
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echo -e "\n\nAttempting default boot...\n\n"
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attempt_default_boot
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fi
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IFS=$IFS_DEF
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}
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show_main_menu()
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@ -194,6 +185,14 @@ attempt_default_boot()
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# gui-init-basic start
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TRACE "Under /bin/gui-init, start"
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# USB automatic boot (if configured) occurs before mounting /boot, this should
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# work even if no OS is installed
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if [ "$CONFIG_BASIC_USB_AUTOBOOT" = "y" ] && usb-autoboot.sh; then
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# USB autoboot was offered and interrupted. Don't offer the default boot,
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# go to the menu.
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skip_to_menu=true
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fi
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if ! detect_boot_device ; then
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# can't determine /boot device or no OS installed,
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# so fall back to interactive selection
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53
initrd/bin/usb-autoboot.sh
Executable file
53
initrd/bin/usb-autoboot.sh
Executable file
@ -0,0 +1,53 @@
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#!/bin/bash
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set -o pipefail
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. /etc/functions
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. /etc/gui_functions
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# Automatically boot to a bootable USB medium if present. This is for
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# unattended boot; there is no UI.
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# There are three possible results:
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# * Automatic boot occurs - script does not return (kexec happens)
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# * User interrupted automatic boot - script returns 0. Skip normal boot and go
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# to the boot menu (don't prompt for two automatic boots).
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# * No automatic boot was attempted - script returns nonzero. Continue with
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# normal automatic boot.
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# These may die for failure, nonzero exit is correct (USB boot wasn't possible)
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enable_usb
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enable_usb_storage
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mkdir -p /media
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parse_boot_options()
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{
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BOOTDIR="$1"
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for i in $(find "$BOOTDIR" -name '*.cfg'); do
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kexec-parse-boot "$BOOTDIR" "$i"
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done
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}
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# Look for any bootable USB medium.
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list_usb_storage >/tmp/usb-autoboot-usb-storage
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while read -u 4 -r USB_BLOCK_DEVICE; do
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mount "$USB_BLOCK_DEVICE" /media || continue
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USB_DEFAULT_BOOT="$(parse_boot_options /media | head -1)"
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if [ -n "$USB_DEFAULT_BOOT" ]; then
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# Boot automatically, unless the user interrupts.
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echo -e "\n\n"
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echo "Found bootable USB: $(echo "$USB_DEFAULT_BOOT" | cut -d '|' -f 1)"
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if ! pause_automatic_boot; then
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# User interrupted, go to boot menu
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umount /media
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exit 0
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fi
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echo -e "\n\nBooting from USB...\n\n"
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kexec-boot -b /media -e "$USB_DEFAULT_BOOT"
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# If kexec-boot returned, the boot obviously did not occur,
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# return nonzero below so the normal OS boot will continue.
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fi
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umount /media
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done 4</tmp/usb-autoboot-usb-storage
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# No bootable USB medium found
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exit 1
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