instance_pause: Add buttons to start/stop instance

cmd/instance_pause.go

@@ -0,0 +1,47 @@
+package cmd
+
+import (
+	wisski_distillery "github.com/FAU-CDI/wisski-distillery"
+	"github.com/FAU-CDI/wisski-distillery/internal/cli"
+)
+
+// InstancePause is the 'instance_pause' command
+var InstancePause wisski_distillery.Command = instancepause{}
+
+type instancepause struct {
+	Stop        bool `short:"d" long:"stop" description:"stop instance"`
+	Start       bool `short:"u" long:"start" description:"start (or restart) instance"`
+	Positionals struct {
+		Slug string `positional-arg-name:"slug" required:"1-1" description:"name of instance to purge"`
+	} `positional-args:"true"`
+}
+
+func (instancepause) Description() wisski_distillery.Description {
+	return wisski_distillery.Description{
+		Requirements: cli.Requirements{
+			NeedsDistillery: true,
+		},
+		Command:     "instance_pause",
+		Description: "stops or starts a single instance",
+	}
+}
+
+func (i instancepause) AfterParse() error {
+	if i.Stop == i.Start {
+		return errStopStartExcluded
+	}
+	return nil
+}
+
+func (i instancepause) Run(context wisski_distillery.Context) error {
+	instance, err := context.Environment.Instances().WissKI(context.Context, i.Positionals.Slug)
+	if err != nil {
+		return err
+	}
+
+	if i.Stop {
+		return instance.Barrel().Stack().Down(context.Context, context.Stdout)
+	} else {
+		return instance.Barrel().Stack().Up(context.Context, context.Stdout)
+	}
+}