tests: split example_filesystems into its own package

Running these tests from integration_tests' TestMain() was awkward
because they were run twice with unchanged settings.
integration_tests tests everything with OpenSSL and with native
Go crypto, but this does not take affect for the example filesystems.

To make this work, test_helpers is also split into its own package.

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/stress_tests/extractloop.bash b/tests/stress_tests/extractloop.bash
new file mode 100755
index 0000000..c488707
--- /dev/null
+++ b/tests/stress_tests/extractloop.bash
@@ -0,0 +1,56 @@
+#!/bin/bash
+#
+# Mount a gocryptfs filesystem somewhere on /tmp, then run two parallel
+# infinite loops inside that do the following:
+# 1) Extract linux-3.0.tar.gz
+# 2) Verify the md5sums
+# 3) Delete, go to (1)
+#
+# This test is good at discovering inode-related memory leaks because it creates
+# huge numbers of files.
+
+set -eu
+
+cd "$(dirname "$0")"
+MD5="$PWD/extractloop.md5sums"
+
+# Setup
+cd /tmp
+wget -nv --show-progress -c https://www.kernel.org/pub/linux/kernel/v3.0/linux-3.0.tar.gz
+DIR1=$(mktemp -d)
+DIR2=$(mktemp -d)
+gocryptfs -q -init -extpass="echo test" $DIR1
+gocryptfs -q -extpass="echo test" -nosyslog $DIR1 $DIR2
+#gocryptfs -q -extpass="echo test" -nosyslog -memprofile /tmp/extractloop-mem $DIR1 $DIR2
+cd $DIR2
+
+# Cleanup trap
+# Note: gocryptfs may have already umounted itself because bash relays SIGINT
+# Just ignore fusermount errors.
+trap "cd /; fusermount -u -z $DIR2; rm -rf $DIR1 $DIR2" EXIT
+
+function loop {
+	# Note: In a subshell, $$ returns the PID of the *parent* shell,
+	# we need our own, which is why we have to use $BASHPID.
+	mkdir $BASHPID
+	cd $BASHPID
+
+	echo "[pid $BASHPID] Starting loop"
+
+	N=1
+	while true
+	do
+		t1=$SECONDS
+		tar xf /tmp/linux-3.0.tar.gz
+		md5sum --status -c $MD5
+		rm -Rf linux-3.0
+		t2=$SECONDS
+		delta=$((t2-t1))
+		echo "[pid $BASHPID] Iteration $N done, $delta seconds"
+		let N=$N+1
+	done
+}
+
+loop &
+loop &
+wait