image: Truly dynamic backend registration

This allows one backend to provide multiple types.  For example, our
TarBackend can provide optional .gz, .bz2, and .xz compression.

1 files changed, 2 insertions, 4 deletions

diff --git a/image/backends/basic.cc b/image/backends/basic.cc
index bec3e41..0aa1afa 100644
--- a/image/backends/basic.cc
+++ b/image/backends/basic.cc
@@ -15,10 +15,8 @@
 namespace Horizon {
 namespace Image {
 
-std::vector<BackendDescriptor> known_backends = {
-   {"tar", "Create a tarball (.tar)", [](std::string, std::string){ return nullptr; } },
-   {"squashfs", "Create a SquashFS image (.squashfs)", [](std::string, std::string){ return nullptr; } }
-};
+std::vector<BackendDescriptor> known_backends
+__attribute__ ((init_priority(200)));
 
 const std::vector<BackendDescriptor> BackendManager::available_backends() {
     return known_backends;