From e2dc52a9657e530820b2d5b49ad7425b529029ce Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 7 Mar 2021 17:22:29 +0100
Subject: v2api: -sharestorage: disable hard link tracking & add tests

Hard link tracking was not correctly disabled
since the migration to the go-fuse v2 api.

Add a test to ensure it stays off.

Fixes https://github.com/rfjakob/gocryptfs/issues/525
---
 tests/cli/cli_test.go | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'tests/cli')

diff --git a/tests/cli/cli_test.go b/tests/cli/cli_test.go
index 2872592..23cea05 100644
--- a/tests/cli/cli_test.go
+++ b/tests/cli/cli_test.go
@@ -822,3 +822,50 @@ func TestInitNotEmpty(t *testing.T) {
 		t.Fatalf("wrong exit code: have=%d, want=%d", exitCode, exitcodes.CipherDir)
 	}
 }
+
+// TestSharedstorage checks that `-sharedstorage` hands out arbitrary inode
+// numbers (no hard link tracking)
+func TestSharedstorage(t *testing.T) {
+	dir := test_helpers.InitFS(t)
+	mnt := dir + ".mnt"
+	err := os.Mkdir(mnt, 0700)
+	if err != nil {
+		t.Fatal(err)
+	}
+	test_helpers.MountOrFatal(t, dir, mnt, "-extpass=echo test", "-sharedstorage")
+	defer test_helpers.UnmountPanic(mnt)
+	foo1 := mnt + "/foo1"
+	foo2 := mnt + "/foo2"
+	if err := ioutil.WriteFile(foo1, nil, 0755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Link(foo1, foo2); err != nil {
+		t.Fatal(err)
+	}
+	var st1, st2, st3 syscall.Stat_t
+	if err := syscall.Stat(foo1, &st1); err != nil {
+		t.Fatal(err)
+	}
+	// The link show show a new inode number
+	if err := syscall.Stat(foo2, &st2); err != nil {
+		t.Fatal(err)
+	}
+	// Stat()'ing again should give us again a new inode number
+	if err := syscall.Stat(foo2, &st3); err != nil {
+		t.Fatal(err)
+	}
+	if st1.Ino == st2.Ino || st2.Ino == st3.Ino || st1.Ino == st3.Ino {
+		t.Error(st1.Ino, st2.Ino, st3.Ino)
+	}
+	// Check that we we don't have stat caching. New length should show up
+	// on the hard link immediately.
+	if err := ioutil.WriteFile(foo1, []byte("xxxxxx"), 0755); err != nil {
+		t.Fatal(err)
+	}
+	if err := syscall.Stat(foo2, &st2); err != nil {
+		t.Fatal(err)
+	}
+	if st2.Size != 6 {
+		t.Fatal(st2.Size)
+	}
+}
-- 
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