Windows: CMD not honouring arg escaping

Signed-off-by: John Howard <jhoward@microsoft.com>

builder/dockerfile/dispatchers.go

@@ -407,6 +407,8 @@ func cmd(b *Builder, args []string, attributes map[string]bool, original string)
 	}
 
 	b.runConfig.Cmd = strslice.StrSlice(cmdSlice)
+	// set config as already being escaped, this prevents double escaping on windows
+	b.runConfig.ArgsEscaped = true
 
 	if err := b.commit("", b.runConfig.Cmd, fmt.Sprintf("CMD %q", cmdSlice)); err != nil {
 		return err

daemon/commit.go

@@ -74,6 +74,7 @@ func merge(userConf, imageConf *containertypes.Config) error {
 	if len(userConf.Entrypoint) == 0 {
 		if len(userConf.Cmd) == 0 {
 			userConf.Cmd = imageConf.Cmd
+			userConf.ArgsEscaped = imageConf.ArgsEscaped
 		}
 
 		if userConf.Entrypoint == nil {

integration-cli/docker_cli_build_test.go

@@ -6952,3 +6952,28 @@ func (s *DockerSuite) TestBuildShellWindowsPowershell(c *check.C) {
 		c.Fatalf("Line with 'John' not found in output %q", out)
 	}
 }
+
+// #22868. Make sure shell-form CMD is marked as escaped in the config of the image
+func (s *DockerSuite) TestBuildCmdShellArgsEscaped(c *check.C) {
+	testRequires(c, DaemonIsWindows)
+	name := "testbuildcmdshellescaped"
+
+	_, err := buildImage(name, `
+  FROM `+minimalBaseImage()+`
+  CMD "tasklist"
+  `, true)
+	if err != nil {
+		c.Fatal(err)
+	}
+	res := inspectFieldJSON(c, name, "Config.ArgsEscaped")
+	if res != "true" {
+		c.Fatalf("CMD did not update Config.ArgsEscaped on image: %v", res)
+	}
+	dockerCmd(c, "run", "--name", "inspectme", name)
+	dockerCmd(c, "wait", "inspectme")
+	res = inspectFieldJSON(c, name, "Config.Cmd")
+
+	if res != `["cmd","/S","/C","\"tasklist\""]` {
+		c.Fatalf("CMD was not escaped Config.Cmd: got %v", res)
+	}
+}