Add endpoint for tagging a model

Signed-off-by: Emily Casey <[email protected]>

Author: ekcasey

pkg/inference/models/manager.go

@@ -92,6 +92,7 @@ func (m *Manager) routeHandlers() map[string]http.HandlerFunc {
 		"GET " + inference.ModelsPrefix:                                       m.handleGetModels,
 		"GET " + inference.ModelsPrefix + "/{name...}":                        m.handleGetModel,
 		"DELETE " + inference.ModelsPrefix + "/{name...}":                     m.handleDeleteModel,
+		"POST " + inference.ModelsPrefix + "/{name}/tag":                      m.handleTagModel,
 		"GET " + inference.InferencePrefix + "/{backend}/v1/models":           m.handleOpenAIGetModels,
 		"GET " + inference.InferencePrefix + "/{backend}/v1/models/{name...}": m.handleOpenAIGetModel,
 		"GET " + inference.InferencePrefix + "/v1/models":                     m.handleOpenAIGetModels,
@@ -288,6 +289,53 @@ func (m *Manager) handleOpenAIGetModel(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+// handleTagModel handles POST <inference-prefix>/models/{name}/tag requests.
+// The query parameters are:
+// - repo: the repository to tag the model with (required)
+// - tag: the tag to tag the model with (optional, defaults to "latest")
+func (m *Manager) handleTagModel(w http.ResponseWriter, r *http.Request) {
+	if m.distributionClient == nil {
+		http.Error(w, "model distribution service unavailable", http.StatusServiceUnavailable)
+		return
+	}
+
+	// Extract the model name from the request path.
+	model := r.PathValue("name")
+
+	// Extract query parameters.
+	repo := r.URL.Query().Get("repo")
+	tag := r.URL.Query().Get("tag")
+
+	// Validate query parameters.
+	if repo == "" {
+		http.Error(w, "missing repo or tag query parameter", http.StatusBadRequest)
+		return
+	}
+	if tag == "" {
+		tag = "latest"
+	}
+
+	// Construct the target string.
+	target := fmt.Sprintf("%s:%s", repo, tag)
+
+	// Call the Tag method on the distribution client with source and modelName.
+	if err := m.distributionClient.Tag(model, target); err != nil {
+		m.log.Warnf("Failed to tag model %q: %v", model, err)
+
+		if errors.Is(err, distribution.ErrModelNotFound) {
+			http.Error(w, err.Error(), http.StatusNotFound)
+			return
+		}
+
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	// Respond with success.
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(fmt.Sprintf("Model %q tagged successfully with source %q", modelName, model)))
+}
+
 // ServeHTTP implement net/http.Handler.ServeHTTP.
 func (m *Manager) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	m.router.ServeHTTP(w, r)