1 files changed, 84 insertions, 0 deletions
diff --git a/cmd/crane/cmd/serve.go b/cmd/crane/cmd/serve.go
new file mode 100644
index 0000000..5b11153
--- /dev/null
+++ b/cmd/crane/cmd/serve.go
@@ -0,0 +1,84 @@
+// Copyright 2023 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/spf13/cobra"
+
+	"github.com/google/go-containerregistry/pkg/registry"
+)
+
+func newCmdRegistry() *cobra.Command {
+	cmd := &cobra.Command{
+		Use: "registry",
+	}
+	cmd.AddCommand(newCmdServe())
+	return cmd
+}
+
+func newCmdServe() *cobra.Command {
+	return &cobra.Command{
+		Use:   "serve",
+		Short: "Serve an in-memory registry implementation",
+		Long: `This sub-command serves an in-memory registry implementation on port :8080 (or $PORT)
+
+The command blocks while the server accepts pushes and pulls.
+
+Contents are only stored in memory, and when the process exits, pushed data is lost.`,
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			ctx := cmd.Context()
+
+			port := os.Getenv("PORT")
+			if port == "" {
+				port = "0"
+			}
+			listener, err := net.Listen("tcp", "localhost:"+port)
+			if err != nil {
+				log.Fatalln(err)
+			}
+			porti := listener.Addr().(*net.TCPAddr).Port
+			port = fmt.Sprintf("%d", porti)
+
+			s := &http.Server{
+				ReadHeaderTimeout: 5 * time.Second, // prevent slowloris, quiet linter
+				Handler:           registry.New(),
+			}
+			log.Printf("serving on port %s", port)
+
+			errCh := make(chan error)
+			go func() { errCh <- s.Serve(listener) }()
+
+			<-ctx.Done()
+			log.Println("shutting down...")
+			if err := s.Shutdown(ctx); err != nil {
+				return err
+			}
+
+			if err := <-errCh; !errors.Is(err, http.ErrServerClosed) {
+				return err
+			}
+			return nil
+		},
+	}
+}