machined/machinectl: add logic to show list of available images

This adds a new bus call to machined that enumerates /var/lib/container
and returns all trees stored in it, distuingishing three types:

        - GPT disk images, which are files suffixed with ".gpt"
        - directory trees
        - btrfs subvolumes

1 files changed, 23 insertions, 0 deletions

diff --git a/src/machine/machine-dbus.c b/src/machine/machine-dbus.c
index f6fd9cf361..163c73d451 100644
--- a/src/machine/machine-dbus.c
+++ b/src/machine/machine-dbus.c
@@ -32,6 +32,7 @@
 #include "fileio.h"
 #include "in-addr-util.h"
 #include "local-addresses.h"
+#include "image.h"
 #include "machine.h"
 
 static int property_get_id(
@@ -475,9 +476,11 @@ char *machine_bus_path(Machine *m) {
 }
 
 int machine_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
+        _cleanup_(image_hashmap_freep) Hashmap *images = NULL;
         _cleanup_strv_free_ char **l = NULL;
         Machine *machine = NULL;
         Manager *m = userdata;
+        Image *image;
         Iterator i;
         int r;
 
@@ -497,6 +500,26 @@ int machine_node_enumerator(sd_bus *bus, const char *path, void *userdata, char
                         return r;
         }
 
+        images = hashmap_new(&string_hash_ops);
+        if (!images)
+                return -ENOMEM;
+
+        r = image_discover(images);
+        if (r < 0)
+                return r;
+
+        HASHMAP_FOREACH(image, images, i) {
+                char *p;
+
+                p = image_bus_path(image->name);
+                if (!p)
+                        return -ENOMEM;
+
+                r = strv_consume(&l, p);
+                if (r < 0)
+                        return r;
+        }
+
         *nodes = l;
         l = NULL;