test/libcephfs: test truncate on rdonly fd

Fixes: https://tracker.ceph.com/issues/48202
Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit 2b41ddf343e8e314dc60fae0d5f4e007ce3857e4)

Conflicts:
        src/test/libcephfs/test.cc
- rewrite a trivial string + int concatenation to eliminate fmt::format

diff --git a/src/test/libcephfs/test.cc b/src/test/libcephfs/test.cc
index e4998d0a92c5dccd6a5737d17b85300d25d7f116..fb7292e342b2213035de703dec4c50d3e7e102bb 100644 (file)
--- a/src/test/libcephfs/test.cc
+++ b/src/test/libcephfs/test.cc
@@ -76,6 +76,30 @@ TEST(LibCephFS, OpenEmptyComponent) {
   ceph_shutdown(cmount);
 }
 
+TEST(LibCephFS, OpenReadTruncate) {
+  struct ceph_mount_info *cmount;
+  ASSERT_EQ(0, ceph_create(&cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_read_file(cmount, NULL));
+  ASSERT_EQ(0, ceph_conf_parse_env(cmount, NULL));
+  ASSERT_EQ(0, ceph_mount(cmount, "/"));
+
+  auto path = "test_open_rdt_" + std::to_string(getpid());
+  int fd = ceph_open(cmount, path.c_str(), O_WRONLY|O_CREAT, 0666);
+  ASSERT_LE(0, fd);
+
+  auto data = std::string("hello world");
+  ASSERT_EQ(ceph_write(cmount, fd, data.c_str(), data.size(), 0), (int)data.size());
+  ASSERT_EQ(0, ceph_close(cmount, fd));
+
+  fd = ceph_open(cmount, path.c_str(), O_RDONLY, 0);
+  ASSERT_LE(0, fd);
+  ASSERT_EQ(ceph_ftruncate(cmount, fd, 0), -EBADF);
+  ASSERT_EQ(ceph_ftruncate(cmount, fd, 1), -EBADF);
+  ASSERT_EQ(0, ceph_close(cmount, fd));
+
+  ceph_shutdown(cmount);
+}
+
 TEST(LibCephFS, OpenReadWrite) {
   struct ceph_mount_info *cmount;
   ASSERT_EQ(0, ceph_create(&cmount, NULL));