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File 05efi of Package os-prober

#!/bin/sh
# Detects all UEFI bootloaders on EFI System Partition

. /usr/share/os-prober/common.sh

partition="$1"
mpoint="$2"
type="$3"

# This file is for UEFI platform only
if [ ! -d /sys/firmware/efi ]; then
	debug "Not on UEFI platform"
	exit 1
fi

# Weed out stuff that doesn't apply to us
case "$type" in
	vfat) debug "$1 is a FAT32 partition" ;;
	msdos) debug "$1 is a FAT16 partition" ;;
	fuse|fuseblk) debug "$1 is a FUSE partition" ;; # might be GRUB
	*) debug "$1 is $type partition: exiting"; exit 1 ;;
esac

if type udevadm > /dev/null 2>&1; then
	udevinfo () {
		udevadm info "$@"
	}
fi

if type udevinfo > /dev/null 2>&1; then
	# Skip virtual devices
	if udevinfo -q path -n $partition | grep -q /virtual/; then
		debug "$1 is virtual device: exiting"
		exit 1
	fi

eval "$(udevinfo -q property -n "$partition" | grep -E '^ID_PART_ENTRY_(TYPE|SCHEME)=')"
	debug "$partition partition scheme is $ID_PART_ENTRY_SCHEME"
	debug "$partition partition type is $ID_PART_ENTRY_TYPE"

if [ -z "$ID_PART_ENTRY_TYPE" -o -z "$ID_PART_ENTRY_SCHEME" -o \
		$ "$ID_PART_ENTRY_SCHEME" != gpt -a "$ID_PART_ENTRY_SCHEME" != msdos $ -o \
		$ "$ID_PART_ENTRY_SCHEME" = gpt -a "$ID_PART_ENTRY_TYPE" != c12a7328-f81f-11d2-ba4b-00a0c93ec93b $ -o \
		$ "$ID_PART_ENTRY_SCHEME" = msdos -a "$ID_PART_ENTRY_TYPE" != 0xef $ ]; then
		debug "$partition is not a ESP partition: exiting"
		exit 1
	fi
else
	debug "udevinfo and udevadm missing - cannot check partition type"
fi

efi=$(item_in_dir efi "$mpoint")
if [ -z "$efi" ]; then
	debug "$mpoint does not have /EFI directory: exiting"
	exit 1
fi

ret=1
for test in /usr/lib/os-probes/mounted/efi/*; do
	debug "running subtest $test"
	if [ -f "$test" ] && [ -x "$test" ]; then
		entry=$("$test" "$mpoint/$efi")
		if [ -n "$entry" ]; then
			debug "bootloader $entry found by subtest $test"
			ret=0
			result "${partition}@/$efi/${entry}:efi"
		fi
	fi
done

exit $ret

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File 05efi of Package os-prober

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