From 5e4f8bde42c76a4463b260ce5308089f5fe7048d Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Mon, 5 Jun 2023 13:43:23 +0200
Subject: tests/cluster: add TestOpenTruncate

This fails right now:

1 jakob@brikett:~/go/src/github.com/rfjakob/gocryptfs/tests/cluster$ go test -run TestOpenTruncate -v
=== RUN   TestOpenTruncate
    cluster_test.go:235: POSIX compliance issue: non-exlusive create failed with err=file exists
doWrite 2898550: corrupt header: ParseHeader: header is all-zero. Header hexdump: 000000000000000000000000000000000000
    cluster_test.go:240: iteration 1: WriteAt: write /var/tmp/gocryptfs-test-parent-1026/1896094179/TestOpenTruncate.4202105280.mnt2/foo: input/output error
 --- FAIL: TestOpenTruncate (0.10s)
FAIL
exit status 1
FAIL	github.com/rfjakob/gocryptfs/v2/tests/cluster	0.099s
1 jakob@brikett:~/go/src/github.com/rfjakob/gocryptfs/tests/cluster$ go test -run TestOpenTruncate -v
=== RUN   TestOpenTruncate
    cluster_test.go:235: POSIX compliance issue: non-exlusive create failed with err=file exists
doRead 2898565: corrupt block #0: cipher: message authentication failed
ino2898565 fh9: RMW read failed: errno=5
    cluster_test.go:240: iteration 8: WriteAt: write /var/tmp/gocryptfs-test-parent-1026/652691834/TestOpenTruncate.281532388.mnt1/foo: input/output error
 --- FAIL: TestOpenTruncate (0.09s)
FAIL
exit status 1
FAIL	github.com/rfjakob/gocryptfs/v2/tests/cluster	0.095s
---
 tests/cluster/cluster_test.go | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tests/cluster/cluster_test.go b/tests/cluster/cluster_test.go
index 9edb2f9..d788bdb 100644
--- a/tests/cluster/cluster_test.go
+++ b/tests/cluster/cluster_test.go
@@ -183,3 +183,40 @@ func TestConcurrentCreate(t *testing.T) {
 	go workerThread(mnt2 + "/foo")
 	wg.Wait()
 }
+
+func TestOpenTruncate(t *testing.T) {
+	cDir := test_helpers.InitFS(t)
+	mnt1 := cDir + ".mnt1"
+	mnt2 := cDir + ".mnt2"
+	test_helpers.MountOrFatal(t, cDir, mnt1, "-extpass=echo test", "-wpanic=0", "-sharedstorage")
+	defer test_helpers.UnmountPanic(mnt1)
+	test_helpers.MountOrFatal(t, cDir, mnt2, "-extpass=echo test", "-wpanic=0", "-sharedstorage")
+	defer test_helpers.UnmountPanic(mnt2)
+
+	var wg sync.WaitGroup
+	const loops = 100
+
+	writerThread := func(path string) {
+		defer wg.Done()
+		for i := 0; i < loops; i++ {
+			if t.Failed() {
+				return
+			}
+			f, err := os.Create(path)
+			if err != nil {
+				t.Logf("POSIX compliance issue: non-exlusive create failed with err=%v", errors.Unwrap(err))
+				continue
+			}
+			_, err = f.WriteAt([]byte("foo"), 0)
+			if err != nil {
+				t.Errorf("iteration %d: WriteAt: %v", i, err)
+			}
+			f.Close()
+		}
+	}
+
+	wg.Add(2)
+	go writerThread(mnt1 + "/foo")
+	go writerThread(mnt2 + "/foo")
+	wg.Wait()
+}
-- 
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