ore/hetzner: add garbage collection

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

cmd/ore/hetzner.go

@@ -0,0 +1,12 @@
+// Copyright The Mantle Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"github.com/flatcar/mantle/cmd/ore/hetzner"
+)
+
+func init() {
+	root.AddCommand(hetzner.Hetzner)
+}

cmd/ore/hetzner/gc.go

@@ -0,0 +1,36 @@
+// Copyright The Mantle Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package hetzner
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	cmdGC = &cobra.Command{
+		Use:   "gc",
+		Short: "GC resources in Hetzner",
+		Long:  `Delete instances and images created over the given duration ago`,
+		RunE:  runGC,
+	}
+
+	gcDuration time.Duration
+)
+
+func init() {
+	Hetzner.AddCommand(cmdGC)
+	cmdGC.Flags().DurationVar(&gcDuration, "duration", 5*time.Hour, "how old resources must be before they're considered garbage")
+}
+
+func runGC(cmd *cobra.Command, args []string) error {
+	if err := API.GC(context.Background(), gcDuration); err != nil {
+		return fmt.Errorf("running garbage collection: %w", err)
+	}
+
+	return nil
+}

cmd/ore/hetzner/hetzner.go

@@ -0,0 +1,42 @@
+// Copyright The Mantle Authors.
+// SPDX-License-Identifier: Apache-2.0
+package hetzner
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/coreos/pkg/capnslog"
+	"github.com/flatcar/mantle/cli"
+	"github.com/flatcar/mantle/platform/api/hetzner"
+	"github.com/spf13/cobra"
+)
+
+var (
+	plog = capnslog.NewPackageLogger("github.com/flatcar/mantle", "ore/hetzner")
+
+	Hetzner = &cobra.Command{
+		Use:   "hetzner [command]",
+		Short: "hetzner image utilities",
+	}
+
+	API     *hetzner.API
+	options hetzner.Options
+)
+
+func init() {
+	cli.WrapPreRun(Hetzner, preflightCheck)
+	Hetzner.PersistentFlags().StringVar(&options.Token, "hetzner-token", "", "Hetzner token for client authentication")
+	Hetzner.PersistentFlags().StringVar(&options.Location, "hetzner-location", "", "Hetzner location name")
+}
+
+func preflightCheck(cmd *cobra.Command, args []string) error {
+	api, err := hetzner.New(&options)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "could not create Hetzner API client: %v\n", err)
+		os.Exit(1)
+	}
+
+	API = api
+	return nil
+}