source: client/shared/lib/os-probes/mounted/05efi @ 1d1e06d

#!/bin/sh
# Detects all Microsoft OSes on a collection of partitions.

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

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

# This file is for UEFI platform only
if [ ! -d /sys/firmware/efi ] || [ -f /var/lib/partman/ignore_uefi ]; 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" ;;
        fat) debug "$1 is a FAT partition (mounted by 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