source: client/shared/lib/os-probes/mounted/20microsoft @ 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 script looks for legacy BIOS bootloaders only. Skip if running UEFI
if [ -d /sys/firmware/efi ] && [ ! -f /var/lib/partman/ignore_uefi ] && [ -z "$WINOSDATA" ]; then
        debug "Skipping legacy bootloaders on UEFI system"
        exit 1
fi

# Weed out stuff that doesn't apply to us
case "$type" in
        ntfs|ntfs-3g) debug "$1 is a NTFS partition" ;;
        vfat) debug "$1 is a FAT32 partition" ;;
        msdos) debug "$1 is a FAT16 partition" ;;
        fat) debug "$1 is a FAT partition (mounted by GRUB)" ;;
        fuse|fuseblk) debug "$1 is a FUSE partition" ;; # might be ntfs-3g
        *) debug "$1 is not a MS partition: exiting"; exit 1 ;;
esac

found=
# Vista (previously Longhorn)
if item_in_dir -q bootmgr "$2"; then
        # there might be different boot directories in different case as:
        # boot Boot BOOT
        for boot in $(item_in_dir boot "$2"); do
                bcd=$(item_in_dir bcd "$2/$boot")
                if [ -n "$bcd" ]; then
                        if   grep -aqs "W.i.n.d.o.w.s. .1.0" "$2/$boot/$bcd"; then
                                long="Windows 10 (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .8" "$2/$boot/$bcd"; then
                                long="Windows 8 (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .7" "$2/$boot/$bcd"; then
                                long="Windows 7 (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .V.i.s.t.a" "$2/$boot/$bcd"; then
                                long="Windows Vista (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8. .R.2." "$2/$boot/$bcd"; then
                                long="Windows Server 2008 R2 (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8." "$2/$boot/$bcd"; then
                                long="Windows Server 2008 (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" "$2/$boot/$bcd"; then
                                long="Windows Recovery Environment (loader)"
                        elif grep -aqs "W.i.n.d.o.w.s. .S.e.t.u.p" "$2/$boot/$bcd"; then
                                long="Windows Recovery Environment (loader)"
                        else
                                long="Windows Vista (loader)"
                        fi
                        short=Windows

                        found=true

                        break
                fi
        done
fi

# 2000/XP/NT4.0
if [ -z "$found" ] && item_in_dir -q ntldr "$2" && item_in_dir -q ntdetect.com "$2"; then
        long="Windows NT/2000/XP"
        short=Windows
        ini=$(item_in_dir boot.ini "$2")
        if [ -n "$ini" ]; then
                multicount="$(grep -e "^multi" "$2/$ini" | wc -l)"
                scsicount="$(grep -e "^scsi" "$2/$ini" | wc -l)"
                msoscount="$(expr "${multicount}" + "${scsicount}")"
                if [ "$msoscount" -eq 1 ]; then
                        # We need to remove a Carriage Return at the end of
                        # the line...
                        defaultmspart="$(grep -e "^default=" "$2/$ini" | cut -d '=' -f2 | tr -d '\r')"
                        # Escape any backslashes in defaultmspart
                        grepexp="^$(echo "$defaultmspart" | sed -e 's/\\/\\\\/')="
                        # Colons not allowed; replace by spaces
                        # Accented characters (non UTF-8) cause debconf to
                        # hang, so we fall back to the default if the name
                        # contains any weird characters.
                        long="$(grep -e "$grepexp" "$2/$ini" | cut -d '"' -f2 | \
                                tr ':' ' ' | LC_ALL=C grep -v '[^a-zA-Z0-9 &()/_-]')"
                        if [ -z "$long" ]; then
                                long="Windows NT/2000/XP"
                        fi
                else
                        long="Windows NT/2000/XP (loader)"
                fi

                found=true
        fi
fi

# MS-DOS
if [ -z "$found" ] && item_in_dir -q dos "$2"; then
        long="MS-DOS 5.x/6.x/Win3.1"
        short=MS-DOS

        found=true
fi

# 95/98/Me
if [ -z "$found" ] && item_in_dir -q windows "$2" &&
     item_in_dir -q win.com "$2"/"$(item_in_dir windows "$2")"; then
        long="Windows 95/98/Me"
        short=Windows9xMe

        found=true
fi


# Restrict to partitions containing the OS
if [ -n "$WINOSDATA" ]; then
    found=
    if [ -d "$2/ProgramData/Microsoft/Windows/Start Menu/Programs/StartUp" ]; then
        long=${long:-"Windows 8 (data)"}
        short=${short:-"Windows"}
        found=true
    elif [ -d "$2/ProgramData/Microsoft/Windows/Start Menu/Programs/Startup" ]; then
        long=${long:-"Windows 7 (data)"}
        short=${short:-"Windows"}
        found=true
    elif [ -d "$2/Documents and Settings/All Users/Start Menu/Programs/Startup" ]; then
        long=${long:-"Windows XP/Vista (data)"}
        short=${short:-"Windows"}
        found=true
    elif [ -d "$2/Winnt/Profiles/All Users/Start Menu/Programs/Startup" ]; then
        long=${long:-"Windows NT (data)"}
        short=${short:-"Windows"}
        found=true
    fi
fi

if [ -z "$found" ]; then
        exit 1
fi

label="$(count_next_label "$short")"
result "${partition}:${long}:${label}:chain"
exit 0