0ebe75b2ca
Complete infrastructure platform CLI: - Container runtime (systemd-nspawn) - VoltVisor VMs (Neutron Stardust / QEMU) - Stellarium CAS (content-addressed storage) - ORAS Registry - GitOps integration - Landlock LSM security - Compose orchestration - Mesh networking Copyright (c) Armored Gates LLC. All rights reserved. Licensed under AGPSL v5.0
67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
/*
|
|
Backend Detection - Auto-detect the best available container backend.
|
|
|
|
Uses a registration pattern to avoid import cycles: backend packages
|
|
register themselves via init() by calling Register().
|
|
*/
|
|
package backend
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
mu sync.Mutex
|
|
registry = map[string]func() ContainerBackend{}
|
|
// order tracks registration order for priority-based detection
|
|
order []string
|
|
)
|
|
|
|
// Register adds a backend factory to the registry.
|
|
// Backends should call this from their init() function.
|
|
func Register(name string, factory func() ContainerBackend) {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
registry[name] = factory
|
|
order = append(order, name)
|
|
}
|
|
|
|
// DetectBackend returns the best available backend for the current platform.
|
|
// Tries backends in registration order, returning the first that is available.
|
|
func DetectBackend() ContainerBackend {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
|
|
for _, name := range order {
|
|
b := registry[name]()
|
|
if b.Available() {
|
|
return b
|
|
}
|
|
}
|
|
|
|
// If nothing is available, return the first registered backend anyway
|
|
// (allows --help and other non-runtime operations to work)
|
|
if len(order) > 0 {
|
|
return registry[order[0]]()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetBackend returns a backend by name, or an error if unknown.
|
|
func GetBackend(name string) (ContainerBackend, error) {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
|
|
if factory, ok := registry[name]; ok {
|
|
return factory(), nil
|
|
}
|
|
|
|
available := make([]string, 0, len(registry))
|
|
for k := range registry {
|
|
available = append(available, k)
|
|
}
|
|
return nil, fmt.Errorf("unknown backend: %q (available: %v)", name, available)
|
|
}
|