This file is indexed.

/usr/lib/os-probes/mounted/20microsoft is in os-prober 1.70ubuntu3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#!/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