doc: cover new toolbox create --hostname flag

Updated the `toolbox create` manual page to cover the usage of the new
`--hostname` flag for specifying custom hostnames when creating new
containers.

Signed-off-by: Buckley Ross <[email protected]>
Change-Id: I16d7f63769c17aec1ff69d34ac8fe28f48827777

Author: buck-ross

doc/toolbox-create.1.md

@@ -6,6 +6,7 @@ toolbox\-create - Create a new toolbox container
 ## SYNOPSIS
 **toolbox create** [*--authfile AUTHFILE*]
                [*--distro DISTRO* | *-d DISTRO*]
+               [*--hostname HOSTNAME*]
                [*--image NAME* | *-i NAME*]
                [*--release RELEASE* | *-r RELEASE*]
                [*CONTAINER*]
@@ -95,6 +96,11 @@ Create a toolbox container for a different operating system DISTRO than the
 host. Cannot be used with `--image`. Has to be coupled with `--release` unless
 the selected DISTRO matches the host.
 
+**--hostname** HOSTNAME
+
+Initializes the netowork hostname of the toolbox container to the specified value.
+If not specified, this will default to **toolbox**.
+
 **--image** NAME, **-i** NAME
 
 Change the NAME of the image used to create the toolbox container. This is

src/cmd/create.go

@@ -123,7 +123,7 @@ func init() {
 func create(cmd *cobra.Command, args []string) error {
 	// This regex filters out strings which are not valid hostnames, according to RFC-1123.
 	// Source: https://stackoverflow.com/a/106223
-	var hostnameRegexp = regexp.MustCompile("^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])$")
+	var hostnameRegexp = regexp.MustCompile(`^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.)*([A-Za-z0-9]|[A-Za-z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])$`)
 
 	if utils.IsInsideContainer() {
 		if !utils.IsInsideToolboxContainer() {