Implement FUSE_UNLINK

Fixes #3696

3 files changed, 102 insertions, 0 deletions

diff --git a/test/fuse/BUILD b/test/fuse/BUILD
index 29b9a9d93..dacfe0175 100644
--- a/test/fuse/BUILD
+++ b/test/fuse/BUILD
@@ -64,6 +64,11 @@ syscall_test(
 
 syscall_test(
     fuse = "True",
+    test = "//test/fuse/linux:unlink_test",
+)
+
+syscall_test(
+    fuse = "True",
     test = "//test/fuse/linux:setstat_test",
 )
 
diff --git a/test/fuse/linux/BUILD b/test/fuse/linux/BUILD
index 7ecd6d8cb..7673252ec 100644
--- a/test/fuse/linux/BUILD
+++ b/test/fuse/linux/BUILD
@@ -214,3 +214,17 @@ cc_binary(
         "//test/util:test_util",
     ],
 )
+
+cc_binary(
+    name = "unlink_test",
+    testonly = 1,
+    srcs = ["unlink_test.cc"],
+    deps = [
+        gtest,
+        ":fuse_base",
+        "//test/util:fuse_util",
+        "//test/util:temp_umask",
+        "//test/util:test_main",
+        "//test/util:test_util",
+    ],
+)
diff --git a/test/fuse/linux/unlink_test.cc b/test/fuse/linux/unlink_test.cc
new file mode 100644
index 000000000..5702e9b32
--- /dev/null
+++ b/test/fuse/linux/unlink_test.cc
@@ -0,0 +1,83 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/fuse.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/statfs.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <string>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "test/fuse/linux/fuse_base.h"
+#include "test/util/fuse_util.h"
+#include "test/util/test_util.h"
+
+namespace gvisor {
+namespace testing {
+
+namespace {
+
+class UnlinkTest : public FuseTest {
+ protected:
+  const std::string test_file_ = "test_file";
+};
+
+TEST_F(UnlinkTest, RegularFile) {
+  const std::string test_file_path =
+      JoinPath(mount_point_.path().c_str(), test_file_);
+  SetServerInodeLookup(test_file_, S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO);
+
+  struct fuse_out_header out_header = {
+      .len = sizeof(struct fuse_out_header),
+  };
+  auto iov_out = FuseGenerateIovecs(out_header);
+  SetServerResponse(FUSE_UNLINK, iov_out);
+
+  ASSERT_THAT(unlink(test_file_path.c_str()), SyscallSucceeds());
+  struct fuse_in_header in_header;
+  std::vector<char> unlinked_file(test_file_.length() + 1);
+  auto iov_in = FuseGenerateIovecs(in_header, unlinked_file);
+  GetServerActualRequest(iov_in);
+
+  EXPECT_EQ(in_header.len, sizeof(in_header) + test_file_.length() + 1);
+  EXPECT_EQ(in_header.opcode, FUSE_UNLINK);
+  EXPECT_EQ(std::string(unlinked_file.data()), test_file_);
+}
+
+TEST_F(UnlinkTest, NoFile) {
+  const std::string test_file_path =
+      JoinPath(mount_point_.path().c_str(), test_file_);
+  SetServerInodeLookup(test_file_, S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO);
+
+  struct fuse_out_header out_header = {
+      .len = sizeof(struct fuse_out_header),
+      .error = -ENOENT,
+  };
+  auto iov_out = FuseGenerateIovecs(out_header);
+  SetServerResponse(FUSE_UNLINK, iov_out);
+
+  ASSERT_THAT(unlink(test_file_path.c_str()), SyscallFailsWithErrno(ENOENT));
+  SkipServerActualRequest();
+}
+
+}  // namespace
+
+}  // namespace testing
+}  // namespace gvisor