Added a name validator to the push command

command/push.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/hashicorp/atlas-go/archive"
@@ -16,6 +17,11 @@ import (
 // archiveTemplateEntry is the name the template always takes within the slug.
 const archiveTemplateEntry = ".packer-template"
 
+var (
+	reName         = regexp.MustCompile("^[a-zA-Z0-9-_/]+$")
+	errInvalidName = fmt.Errorf("Your build name can only contain these characters: [a-zA-Z0-9-_]+")
+)
+
 type PushCommand struct {
 	Meta
 
@@ -88,6 +94,11 @@ func (c *PushCommand) Run(args []string) int {
 		return 1
 	}
 
+	if !reName.MatchString(name) {
+		c.Ui.Error(errInvalidName.Error())
+		return 1
+	}
+
 	// Determine our token
 	if token == "" {
 		token = push.Token

website/source/docs/templates/push.html.markdown

@@ -39,7 +39,7 @@ each category, the available configuration keys are alphabetized.
 
 -   `name` (string) - Name of the build configuration in the build service. If
     this doesn't exist, it will be created (by default). Note that the name can
-    cannot contain dots. `[a-zA-Z0-9-_]+` are safe.
+    cannot contain dots. `[a-zA-Z0-9-_/]+` are safe.
 
 ### Optional