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https://github.com/linuxboot/heads.git
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54 lines
1.6 KiB
Bash
54 lines
1.6 KiB
Bash
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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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