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

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

types="$(fs_type "$partition")" || types=NOT-DETECTED
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 "$types" ]; then
	if type cryptsetup >/dev/null 2>&1 && \
	   cryptsetup luksDump "$partition" >/dev/null 2>&1; then
		debug "$1 is a LUKS partition; skipping"
		exit 0
	fi
	for type in $(grep -v nodev /proc/filesystems); do
		# hfsplus filesystems are mountable as hfs. Try hfs last so
		# that we can tell the difference.
		if [ "$type" = hfs ]; then
			delaytypes="${delaytypes:+$delaytypes }$type"
		elif [ "$type" = fuseblk ]; then
			if type ntfs-3g >/dev/null 2>&1; then
				types="${types:+$types }ntfs-3g"
			fi
		else
			types="${types:+$types }$type"
		fi
	done
fi

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

mounted=
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)" || 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 $delaytypes; do
		if mount -o ro -t "$type" "$partition" "$tmpmnt" 2>/dev/null; then
			debug "mounted as $type filesystem"
			case "$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	
			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 $tmpmnt"
				fi
				case "$type" in
				    btrfs)
					# umount to account for the bind-mount
					if [ -x "$tmpmnt/@/lib" ] && \
					   ! umount $tmpmnt; then
						warn "failed to umount $tmpmnt"
					fi
					;;
				esac
				rmdir "$tmpmnt" || true
				exit 0
			fi
		fi
	done
	if ! umount "$tmpmnt"; then
		warn "failed to umount $tmpmnt"
	fi
fi

rmdir "$tmpmnt" || true

# No tests found anything.
exit 1