tools/cephfs-mirror: fix a dangling pointer

stringify(snap_id) is ephemeral:

tools/cephfs_mirror/PeerReplayer.cc:916:62: warning: object backing the
pointer will be destroyed at the end of the full-expression

  snap_metadata snap_meta[] = {{PRIMARY_SNAP_ID_KEY.c_str(), stringify(snap_id).c_str()}};

Signed-off-by: Ronen Friedman <rfriedma@redhat.com>
(cherry picked from commit 717c5ddae44fe86747d1545f64901163b1619bf8)

diff --git a/src/tools/cephfs_mirror/PeerReplayer.cc b/src/tools/cephfs_mirror/PeerReplayer.cc
index 15bc3309f2cee630d40a131d91e8f0cb8c046d56..b3813584bc751bdda0c13fdf9f34a211a8ecbfca 100644 (file)
--- a/src/tools/cephfs_mirror/PeerReplayer.cc
+++ b/src/tools/cephfs_mirror/PeerReplayer.cc
@@ -914,7 +914,8 @@ int PeerReplayer::synchronize(const std::string &dir_path, uint64_t snap_id,
     return r;
   }
 
-  snap_metadata snap_meta[] = {{PRIMARY_SNAP_ID_KEY.c_str(), stringify(snap_id).c_str()}};
+  auto snap_id_str{stringify(snap_id)};
+  snap_metadata snap_meta[] = {{PRIMARY_SNAP_ID_KEY.c_str(), snap_id_str.c_str()}};
   r = ceph_mksnap(m_remote_mount, dir_path.c_str(), snap_name.c_str(), 0755,
                   snap_meta, 1);
   if (r < 0) {