#!/bin/bash
#
# Mount a go-fuse loopback filesystem in /tmp and run fsstress against it
# in an infinite loop, only exiting on errors.
#
# When called as "fsstress-gocryptfs.bash", a gocryptfs filesystem is tested
# instead.
#
# This test used to fail on older go-fuse versions after a few iterations with
# errors like this:
# "rm: cannot remove ‘/tmp/b/fsstress.2/pd/d1XXX/f4a’: No such file or directory"
#
# Nowadays it should pass an indefinite number of iterations.

set -eu

# Init variables to default values if unset or empty
export TMPDIR=${TMPDIR:-/var/tmp}
DEBUG=${DEBUG:-0}

cd "$(dirname "$0")"
MYNAME=$(basename $0)
source ../fuse-unmount.bash

# fsstress binary
FSSTRESS=$HOME/fuse-xfstests/ltp/fsstress
if [[ ! -x $FSSTRESS ]]
then
	echo "$MYNAME: fsstress binary not found at $FSSTRESS"
	echo "Please clone and compile https://github.com/rfjakob/fuse-xfstests"
	exit 1
fi

# Backing directory
DIR=$(mktemp -d $TMPDIR/$MYNAME.XXX)
# Mountpoint
MNT="$DIR.mnt"
mkdir $MNT

# Set the GOPATH variable to the default if it is empty
GOPATH=$(go env GOPATH)

# Clean up old mounts
for i in $(mount | cut -d" " -f3 | grep $TMPDIR/$MYNAME) ; do
	fusermount -u $i
done

# FS-specific compile and mount
if [[ $MYNAME = fsstress-loopback.bash ]]; then
	echo -n "Recompile go-fuse loopback: "
	cd $GOPATH/src/github.com/hanwen/go-fuse/example/loopback
	git describe
	go build && go install
	OPTS="-q"
	if [[ $DEBUG -eq 1 ]]; then
		OPTS="-debug"
	fi
	$GOPATH/bin/loopback $OPTS "$MNT" "$DIR" &
	disown
elif [[ $MYNAME = fsstress-gocryptfs.bash ]]; then
	echo "Recompile gocryptfs"
	cd $GOPATH/src/github.com/rfjakob/gocryptfs
	./build.bash # also prints the version
	$GOPATH/bin/gocryptfs -q -init -extpass "echo test" -scryptn=10 $DIR
	$GOPATH/bin/gocryptfs -q -extpass "echo test" -nosyslog -fusedebug=$DEBUG $DIR $MNT
elif [[ $MYNAME = fsstress-encfs.bash ]]; then
	encfs --extpass "echo test" --standard $DIR $MNT
else
	echo Unknown mode: $MYNAME
	exit 1
fi

sleep 0.5
echo -n "Waiting for mount: "
while ! grep "$(basename $MNT) fuse" /proc/self/mounts > /dev/null
do
	sleep 1
	echo -n x
done
echo " ok: $MNT"

# Cleanup trap
trap "kill %1 ; cd / ; fuse-unmount -z $MNT ; rm -rf $DIR $MNT" EXIT

echo "Starting fsstress loop"
N=1
while true
do
	echo $N
	mkdir $MNT/fsstress.1
	echo -n "    fsstress.1 "
	$FSSTRESS -r -m 8 -n 1000 -d $MNT/fsstress.1 &
	wait

	mkdir $MNT/fsstress.2
	echo -n "    fsstress.2 "
	$FSSTRESS -p 20 -r -m 8 -n 1000 -d $MNT/fsstress.2 &
	wait

	mkdir $MNT/fsstress.3
	echo -n "    fsstress.3 "
	$FSSTRESS -p 4 -z -f rmdir=10 -f link=10 -f creat=10 -f mkdir=10 \
		-f rename=30 -f stat=30 -f unlink=30 -f truncate=20 -m 8 \
		-n 1000 -d $MNT/fsstress.3 &
	wait

	echo "    rm"
	rm -Rf $MNT/*

	let N=$N+1
done