xNightR00T File Manager

#!/bin/sh
# Sub-tests that require a mounted partition.
set -e
partition="$1"

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

if [ "x$1" = xbtrfs ]; then
       types=btrfs
       if [ -z "$2" -o -z "$3" ]; then
               debug "missing btrfs parameters, exiting"
               exit 1
       fi
       UUID="$2"
       BTRFSDEV="$3"
else
       partition="$1"
       types="$(fs_type "$partition")" || types=NOT-DETECTED
fi

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" = LVM2_member ]; then
	debug "$1 is a LVM2 partition; skipping"
	exit 0
elif [ "$types" = ntfs ]; then
	if type ntfs-3g >/dev/null 2>&1; then
		types='ntfs-3g ntfs'
	fi
elif [ -z "$types" ]; then
	if type cryptsetup >/dev/null 2>&1 && \
	   cryptsetup luksDump "$partition" >/dev/null 2>&1; then
		debug "$1 is a LUKS partition; skipping"
		exit 0
	fi

	# Simply skip such partition is better than trying to detect
	# it by blinded test mounts with all kinds of kernel file system,
	# that would lead to unwanted consequence like kernel oops and
	# risk to corrupt your system and data.
	debug "$1 is a partition without file system; skipping"
	exit 0
fi

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

mounted=

if [ "$types" = btrfs ]; then
	partition="$BTRFSDEV"
elif type grub2-mount >/dev/null 2>&1 && \
   type grub2-probe >/dev/null 2>&1 && \
   grub2-mount "$partition" "$tmpmnt" 2>/dev/null; then
	mounted=1
	type="$(grub2-probe -d "$partition" -t fs)" || true
	if [ "$type" ]; then
		debug "mounted using GRUB $type filesystem driver"
	else
		debug "mounted using GRUB, but unknown filesystem?"
		type=fuseblk
	fi
else
	ro_partition "$partition"
	for type in $types; do
		if mount -o ro -t "$type" "$partition" "$tmpmnt" 2>/dev/null; then
			debug "mounted as $type filesystem"
			mounted=1
			break
		fi
	done
fi

if [ "$mounted" ]; then
	for test in /usr/lib/os-probes/mounted/*; do
		debug "running subtest $test"
		if [ -f "$test" ] && [ -x "$test" ]; then
			if "$test" "$partition" "$tmpmnt" "$type"; then
				debug "os found by subtest $test"
				if ! umount "$tmpmnt"; then
					warn "failed to umount $tmpmnt"
				fi
				rmdir "$tmpmnt" || true
				exit 0
			fi
		fi
	done
	if ! umount "$tmpmnt"; then
		warn "failed to umount $tmpmnt"
	fi
fi


probe_subvol ()
{
	local subvol=$1
	local partition=$2
	local UUID=$3
	local tmpmnt=$4

	mounted=
	mpoint="$(grep btrfs /proc/self/mountinfo | grep "$partition " | grep "/$subvol " | cut -d ' ' -f 5)"
	ret=1

	if [ -n "$subvol" ]; then
		opts="-o subvol=$subvol"
	fi

	if [ -n "$mpoint" ]; then
		if [ "x$mpoint" = "x/" ]; then
			continue # this is the root for the running system
  		fi
		mounted=1
	else
		# again, do not mount btrfs ro
		mount -t btrfs $opts -U "$UUID" "$tmpmnt"
		mpoint="$tmpmnt"
	fi
	test="/usr/lib/os-probes/mounted/90linux-distro"
	if [ -f "$test" ] && [ -x "$test" ]; then
		debug "running subtest $test"
		if "$test" "$partition" "$mpoint" btrfs "UUID=$UUID" "subvol=$subvol"; then
			debug "os found by subtest $test on subvol $subvol"
			ret=0
		fi
	fi
	if [ -z "$mounted" ]; then
		if ! umount "$tmpmnt"; then
			warn "failed to umount $tmpmnt"
		fi
	fi
	return $ret
}

# all btrfs subvol processing here.  Handle both unmounted and
# mounted subvolumes.
if [ "$types" = btrfs ]; then
	debug "begin btrfs processing for $UUID"
	# note that the btrfs volume must not be mounted ro
	if mount -t btrfs -U "$UUID" "$tmpmnt"  2>/dev/null; then
		debug "btrfs volume $UUID mounted"
	else
		warn "cannot mount btrfs volume $UUID, exiting"
		rmdir "$tmpmnt" || true
		exit 1
	fi
	# besides regular subvols, get ro and snapshot so thet can be excluded
        subvols=$(btrfs subvolume list -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
        rosubvols=$(btrfs subvolume list -r -a "$tmpmnt" | cut -d ' ' -f 9 | sed -e s!^\<FS_TREE\>/!!)
        sssubvols=$(btrfs subvolume list -s -a "$tmpmnt" | cut -d ' ' -f 14 | sed -e s!^\<FS_TREE\>/!!)
        defaultvol=$(btrfs subvolume get-default "$tmpmnt" | cut -d ' ' -f 9)
        if ! umount "$tmpmnt"; then
            warn "failed to umount btrfs volume on $tmpmnt"
            rmdir "$tmpmnt" || true
            exit 1
        fi

	found=
	# Always probe subvol or root set as default
	if probe_subvol "$defaultvol" "$partition" "$UUID" "$tmpmnt"; then
		found=1
	fi

	# Probe any other OS on subvol
	for subvol in $subvols; do
		if echo "$rosubvols" | grep -q -x "$subvol" ||
		   echo "$sssubvols" | grep -q -x "$subvol" ||
		   echo "$defaultvol" | grep -q -x "$subvol"; then
			continue
		fi
		debug "begin btrfs processing for $UUID subvol=$subvol"
		if probe_subvol "$subvol" "$partition" "$UUID" "$tmpmnt"; then
			found=1
		fi
	done
	if [ "$found" ]; then
		rmdir "$tmpmnt" || true
		exit 0
	fi
fi

rmdir "$tmpmnt" || true

# No tests found anything.
exit 1