[Libguestfs] [PATCH] uuids: return ENOTSUP if could not set UUID for specific fs

[Chen Hanxiao]

Signed-off-by: Chen Hanxiao <chenhanxiao at cn.fujitsu.com>
---
 daemon/uuids.c       | 6 ++----
 generator/actions.ml | 3 +++
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/daemon/uuids.c b/daemon/uuids.c
index 20eabe3..00c47d8 100644
--- a/daemon/uuids.c
+++ b/daemon/uuids.c
@@ -77,11 +77,9 @@ do_set_uuid (const char *device, const char *uuid)
   else if (STREQ (vfs_type, "btrfs"))
     r = btrfs_set_uuid (device, uuid);
 
-  else {
-    reply_with_error ("don't know how to set the UUID for '%s' filesystems",
+  else
+    NOT_SUPPORTED(-1, "don't know how to set the UUID for '%s' filesystems",
                       vfs_type);
-    r = -1;
-  }
 
   return r;
 }
diff --git a/generator/actions.ml b/generator/actions.ml
index 92f80d2..7ecaf98 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -11804,6 +11804,9 @@ parameter.  In future we may allow other flags to be adjusted." };
     shortdesc = "set the filesystem UUID";
     longdesc = "\
 Set the filesystem UUID on C<device> to C<uuid>.
+If this fails and the errno is ENOTSUP,
+means that there is no support for changing the UUID
+for the type of the specified filesystem.
 
 Only some filesystem types support setting UUIDs.
 
-- 
2.1.0