Continue restructuring

distros/centos/7/build.xsh

@@ -10,5 +10,5 @@ source @(base / "test.xsh")
 opts = get_parser(sys.argv[1:])
 
 cd @(str(base))
-for provider in get_providers():
-    packer build -var-file=@(self.parent / "x86_64.pkrvars.hcl") @(opts["upload"]) -only=@(provider) @(base / "sources")
+for provider in opts["providers"]:
+    packer build -var=@(opts["headless"]) -var-file=@(self.parent / "x86_64.pkrvars.hcl") @(opts["upload"]) -only=@(provider) @(base / "sources")

distros/centos/7/x86_64.pkrvars.hcl

@@ -5,8 +5,8 @@ iso = {
 	checksum = "b79079ad71cc3c5ceb3561fff348a1b67ee37f71f4cddfec09480d4589c191d6"
 }
 boot_command = [
-  "<esc><wait>",
-  "linux inst.ks=cdrom:/ks.cfg console=tty0",
+  "<up><tab><wait>",
+  "<bs><bs><bs><bs><bs> inst.ks=cdrom:/ks.cfg console=tty0",
   "<enter>"
 ]
 cd_files = {