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package transports
import (
"fmt"
"sort"
"sync"
"github.com/containers/image/v5/internal/set"
"github.com/containers/image/v5/types"
)
// knownTransports is a registry of known ImageTransport instances.
type knownTransports struct {
transports map[string]types.ImageTransport
mu sync.Mutex
}
func (kt *knownTransports) Get(k string) types.ImageTransport {
kt.mu.Lock()
t := kt.transports[k]
kt.mu.Unlock()
return t
}
func (kt *knownTransports) Remove(k string) {
kt.mu.Lock()
delete(kt.transports, k)
kt.mu.Unlock()
}
func (kt *knownTransports) Add(t types.ImageTransport) {
kt.mu.Lock()
defer kt.mu.Unlock()
name := t.Name()
if t := kt.transports[name]; t != nil {
panic(fmt.Sprintf("Duplicate image transport name %s", name))
}
kt.transports[name] = t
}
var kt *knownTransports
func init() {
kt = &knownTransports{
transports: make(map[string]types.ImageTransport),
}
}
// Get returns the transport specified by name or nil when unavailable.
func Get(name string) types.ImageTransport {
return kt.Get(name)
}
// Delete deletes a transport from the registered transports.
func Delete(name string) {
kt.Remove(name)
}
// Register registers a transport.
func Register(t types.ImageTransport) {
kt.Add(t)
}
// ImageName converts a types.ImageReference into an URL-like image name, which MUST be such that
// ParseImageName(ImageName(reference)) returns an equivalent reference.
//
// This is the generally recommended way to refer to images in the UI.
//
// NOTE: The returned string is not promised to be equal to the original input to ParseImageName;
// e.g. default attribute values omitted by the user may be filled in the return value, or vice versa.
func ImageName(ref types.ImageReference) string {
return ref.Transport().Name() + ":" + ref.StringWithinTransport()
}
var deprecatedTransports = set.NewWithValues("atomic")
// ListNames returns a list of non deprecated transport names.
// Deprecated transports can be used, but are not presented to users.
func ListNames() []string {
kt.mu.Lock()
defer kt.mu.Unlock()
var names []string
for _, transport := range kt.transports {
if !deprecatedTransports.Contains(transport.Name()) {
names = append(names, transport.Name())
}
}
sort.Strings(names)
return names
}
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