Move builder files to builder/dockerfile

Signed-off-by: Tibor Vass <tibor@docker.com>
Upstream-commit: f41230b93a77ca7f4d84718f39a4847b6117f694
Component: engine

components/engine/builder/dockerfile/command/command.go

@@ -0,0 +1,42 @@
+// Package command contains the set of Dockerfile commands.
+package command
+
+// Define constants for the command strings
+const (
+	Env        = "env"
+	Label      = "label"
+	Maintainer = "maintainer"
+	Add        = "add"
+	Copy       = "copy"
+	From       = "from"
+	Onbuild    = "onbuild"
+	Workdir    = "workdir"
+	Run        = "run"
+	Cmd        = "cmd"
+	Entrypoint = "entrypoint"
+	Expose     = "expose"
+	Volume     = "volume"
+	User       = "user"
+	StopSignal = "stopsignal"
+	Arg        = "arg"
+)
+
+// Commands is list of all Dockerfile commands
+var Commands = map[string]struct{}{
+	Env:        {},
+	Label:      {},
+	Maintainer: {},
+	Add:        {},
+	Copy:       {},
+	From:       {},
+	Onbuild:    {},
+	Workdir:    {},
+	Run:        {},
+	Cmd:        {},
+	Entrypoint: {},
+	Expose:     {},
+	Volume:     {},
+	User:       {},
+	StopSignal: {},
+	Arg:        {},
+}