test/suites: Test image export from devlxd

Signed-off-by: hamistao <pedro.ribeiro@canonical.com>

test/suites/devlxd.sh

@@ -14,6 +14,15 @@ test_devlxd() {
   lxc exec devlxd -- test -S /dev/lxd/sock
   lxc file push --mode 0755 "devlxd-client/devlxd-client" devlxd/bin/
 
+  # Try to export host private image from devlxd.
+  fingerprint="$(lxc image info testimage | awk '/^Fingerprint:/ {print $2}')"
+  [ "$(lxc exec devlxd -- devlxd-client image-export "${fingerprint}")" = "not authorized" ]
+  # Trying to get a private image should return a not found error so that the client can't infer the existence
+  # of and image with the provided fingerprint.
+  lxc config set devlxd security.devlxd.images true
+  [ "$(lxc exec devlxd -- devlxd-client image-export "${fingerprint}" | jq -r .error)" = "not found" ]
+  lxc config unset devlxd security.devlxd.images
+
   lxc config set devlxd user.foo bar
   [ "$(lxc exec devlxd -- devlxd-client user.foo)" = "bar" ]