ctr: add --hostname flag to create, run

Signed-off-by: Samuel Karp <me@samuelkarp.com>

cmd/ctr/commands/commands.go

@@ -201,6 +201,10 @@ var (
 			Name:  "rdt-class",
 			Usage: "name of the RDT class to associate the container with. Specifies a Class of Service (CLOS) for cache and memory bandwidth management.",
 		},
+		cli.StringFlag{
+			Name:  "hostname",
+			Usage: "set the container's host name",
+		},
 	}
 )
 

cmd/ctr/commands/run/run_unix.go

@@ -106,7 +106,7 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 	} else {
 		var (
 			ref = context.Args().First()
-			//for container's id is Args[1]
+			// for container's id is Args[1]
 			args = context.Args()[2:]
 		)
 		opts = append(opts, oci.WithDefaultSpec(), oci.WithDefaultUnixDevices)
@@ -346,6 +346,9 @@ func NewContainer(ctx gocontext.Context, client *containerd.Client, context *cli
 		if c := context.String("rdt-class"); c != "" {
 			opts = append(opts, oci.WithRdt(c, "", ""))
 		}
+		if hostname := context.String("hostname"); hostname != "" {
+			opts = append(opts, oci.WithHostname(hostname))
+		}
 	}
 
 	runtimeOpts, err := getRuntimeOptions(context)