81ad0b597c
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
/*
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Backend Detection - Auto-detect the best available container backend.
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Uses a registration pattern to avoid import cycles: backend packages
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register themselves via init() by calling Register().
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*/
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package backend
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import (
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"fmt"
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"sync"
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)
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var (
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mu sync.Mutex
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registry = map[string]func() ContainerBackend{}
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// order tracks registration order for priority-based detection
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order []string
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)
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// Register adds a backend factory to the registry.
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// Backends should call this from their init() function.
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func Register(name string, factory func() ContainerBackend) {
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mu.Lock()
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defer mu.Unlock()
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registry[name] = factory
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order = append(order, name)
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}
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// DetectBackend returns the best available backend for the current platform.
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// Tries backends in registration order, returning the first that is available.
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func DetectBackend() ContainerBackend {
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mu.Lock()
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defer mu.Unlock()
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for _, name := range order {
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b := registry[name]()
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if b.Available() {
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return b
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}
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}
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// If nothing is available, return the first registered backend anyway
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// (allows --help and other non-runtime operations to work)
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if len(order) > 0 {
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return registry[order[0]]()
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}
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return nil
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}
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// GetBackend returns a backend by name, or an error if unknown.
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func GetBackend(name string) (ContainerBackend, error) {
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mu.Lock()
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defer mu.Unlock()
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if factory, ok := registry[name]; ok {
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return factory(), nil
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}
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available := make([]string, 0, len(registry))
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for k := range registry {
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available = append(available, k)
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}
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return nil, fmt.Errorf("unknown backend: %q (available: %v)", name, available)
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}
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