tools/rbd: make 'children' command support --image-id

Fixes: https://tracker.ceph.com/issues/64376
Signed-off-by: Mykola Golub <mykola.golub@clyso.com>

PendingReleaseNotes

@@ -133,6 +133,8 @@ CephFS: Disallow delegating preallocated inode ranges to clients. Config
   notifications to topics owned by other users. A new configuration parameter:
   ``rgw_topic_require_publish_policy`` can be enabled to deny ``sns:Publish``
   permissions unless explicitly granted by topic policy.
+* RBD: The option ``--image-id`` has been added to `rbd children` CLI command,
+  so it can be run for images in the trash.
 
 >=18.0.0
 

qa/workunits/rbd/cli_generic.sh

@@ -432,6 +432,7 @@ test_trash() {
     rbd trash mv test2
     ID=`rbd trash ls | cut -d ' ' -f 1`
     rbd info --image-id $ID | grep "rbd image 'test2'"
+    rbd children --image-id $ID | wc -l | grep 0
 
     rbd trash restore $ID
     rbd ls | grep test2
@@ -449,6 +450,7 @@ test_trash() {
     rbd create $RBD_CREATE_ARGS -s 1 test1
     rbd snap create test1@snap1
     rbd snap protect test1@snap1
+    rbd clone test1@snap1 clone
     rbd trash mv test1
 
     rbd trash ls | grep test1
@@ -459,7 +461,10 @@ test_trash() {
     ID=`rbd trash ls | cut -d ' ' -f 1`
     rbd snap ls --image-id $ID | grep -v 'SNAPID' | wc -l | grep 1
     rbd snap ls --image-id $ID | grep '.*snap1.*'
+    rbd children --image-id $ID | wc -l | grep 1
+    rbd children --image-id $ID | grep 'clone'
 
+    rbd rm clone
     rbd snap unprotect --image-id $ID --snap snap1
     rbd snap rm --image-id $ID --snap snap1
     rbd snap ls --image-id $ID | grep -v 'SNAPID' | wc -l | grep 0

src/test/cli/rbd/help.t

@@ -195,9 +195,9 @@
   
   rbd help children
   usage: rbd children [--pool <pool>] [--namespace <namespace>] 
-                      [--image <image>] [--snap <snap>] [--snap-id <snap-id>] 
-                      [--all] [--descendants] [--format <format>] 
-                      [--pretty-format] 
+                      [--image <image>] [--snap <snap>] [--image-id <image-id>] 
+                      [--snap-id <snap-id>] [--all] [--descendants] 
+                      [--format <format>] [--pretty-format] 
                       <image-or-snap-spec> 
   
   Display children of an image or its snapshot.
@@ -212,6 +212,7 @@
     --namespace arg       namespace name
     --image arg           image name
     --snap arg            snapshot name
+    --image-id arg        image id
     --snap-id arg         snapshot id
     -a [ --all ]          list all children (include trash)
     --descendants         include all descendants

src/tools/rbd/action/Children.cc

@@ -84,6 +84,7 @@ void get_arguments(po::options_description *positional,
                    po::options_description *options) {
   at::add_image_or_snap_spec_options(positional, options,
                                      at::ARGUMENT_MODIFIER_NONE);
+  at::add_image_id_option(options);
   at::add_snap_id_option(options);
   options->add_options()
     ("all,a", po::bool_switch(), "list all children (include trash)");
@@ -104,14 +105,26 @@ int execute(const po::variables_map &vm,
   std::string namespace_name;
   std::string image_name;
   std::string snap_name;
+  std::string image_id;
+
+  if (vm.count(at::IMAGE_ID)) {
+    image_id = vm[at::IMAGE_ID].as<std::string>();
+  }
+
   int r = utils::get_pool_image_snapshot_names(
     vm, at::ARGUMENT_MODIFIER_NONE, &arg_index, &pool_name, &namespace_name,
-    &image_name, &snap_name, true, utils::SNAPSHOT_PRESENCE_PERMITTED,
-    utils::SPEC_VALIDATION_NONE);
+    &image_name, &snap_name, image_id.empty(),
+    utils::SNAPSHOT_PRESENCE_PERMITTED, utils::SPEC_VALIDATION_NONE);
   if (r < 0) {
     return r;
   }
 
+  if (!image_id.empty() && !image_name.empty()) {
+    std::cerr << "rbd: trying to access image using both name and id."
+              << std::endl;
+    return -EINVAL;
+  }
+
   if (snap_id != LIBRADOS_SNAP_HEAD && !snap_name.empty()) {
     std::cerr << "rbd: trying to access snapshot using both name and id."
               << std::endl;
@@ -127,8 +140,8 @@ int execute(const po::variables_map &vm,
   librados::Rados rados;
   librados::IoCtx io_ctx;
   librbd::Image image;
-  r = utils::init_and_open_image(pool_name, namespace_name, image_name, "", "",
-                                 true, &rados, &io_ctx, &image);
+  r = utils::init_and_open_image(pool_name, namespace_name, image_name,
+				 image_id, "", true, &rados, &io_ctx, &image);
   if (r < 0) {
     return r;
   }