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Dir : ~/proc/thread-self/root/usr/lib/linux-boot-probes/

Edit File: 50mounted-tests

#!/bin/sh
# Sub-tests that require a mounted partition.
. /usr/share/os-prober/common.sh
set -e

do_unmount() {
	if [ "$mounted" ]; then
		umount "$tmpmnt/boot" 2>/dev/null || true
		if ! umount "$tmpmnt"; then
			warn "failed to umount $tmpmnt"
		fi
	fi
	for dm_device in $dm_devices; do
		if [ -e "$dm_device" ]; then
			debug "remove device mapper device $dm_device"
			dmsetup remove $dm_device
		fi
	done
	rmdir "$tmpmnt" || true
}

partition="$1"

types="$(fs_type "$partition")"
if [ "$types" = NOT-DETECTED ]; then
	debug "$1 type not recognised; skipping"
	exit 0
elif [ "$types" = swap ]; then
	debug "$1 is a swap partition; skipping"
	exit 0
elif [ "$types" = crypto_LUKS ]; then
	debug "$1 is a LUKS partition; skipping"
	exit 0
elif [ "$types" = ntfs ]; then
	if type ntfs-3g >/dev/null 2>&1; then
		types='ntfs-3g ntfs'
	fi
elif [ -z "$types" ]; then
	if is_dos_extended_partition "$partition"; then
		debug "$1 looks like an extended dos partition; skipping"
		exit 0
	fi
	if type cryptsetup >/dev/null 2>&1 && \
	   cryptsetup luksDump "$partition" >/dev/null 2>&1; then
		debug "$1 is a LUKS partition; skipping"
		exit 0
	fi
	types="$(grep -v nodev /proc/filesystems)"
fi

tmpmnt=/var/lib/os-prober/mount
if [ ! -d "$tmpmnt" ]; then
	mkdir "$tmpmnt"
fi

mounted=
dm_devices=
if type grub-mount >/dev/null 2>&1 && \
   type grub-probe >/dev/null 2>&1 && \
   grub-mount "$partition" "$tmpmnt" 2>/dev/null; then
	mounted=1
	type="$(grub-probe -d "$partition" -t fs)"
	[ "$type" ] || type=fuseblk
elif dm_device="$(do_dmsetup osprober-linux "$partition")" && \
     [ "$dm_device" ]; then
	dm_devices="$dm_device"
	for type in $types; do
		if mountinfo=`mount -o ro -t "$type" "$dm_device" "$tmpmnt" 2>&1`; then
			debug "mounted as $type filesystem"
			mounted=1
			case "$type" in
			    btrfs)
				if [ -x "$tmpmnt/@/lib" ] && \
				   ! mount --bind "$tmpmnt/@" "$tmpmnt"; then
					warn "failed to mount btrfs subvolume @ on $partition"
					if ! umount $tmpmnt; then
						warn "failed to umount $tmpmnt"
					fi
					mounted=
				fi
				;;
			esac	
			break
		else
			debug "mounting $dm_device ($partition) as $type failed: $mountinfo"
		fi
	done
fi

if [ "$mounted" ]; then
	linux_mount_boot "$partition" "$tmpmnt"
	bootpart="${mountboot%% *}"
	mounted="${mountboot#* }"
	if [ "$dm_device" ]; then
		dm_devices="$dm_device $dm_devices"
	fi

for test in /usr/lib/linux-boot-probes/mounted/*; do
		if [ -f "$test" ] && [ -x "$test" ]; then
			debug "running $test $partition $bootpart $tmpmnt $type"
			if $test "$partition" "$bootpart" "$tmpmnt" "$type"; then
				debug "$test succeeded"
				do_unmount
				exit 0
			fi
		fi
	done
fi
do_unmount

# No tests found anything.
exit 1