Add MachineHostType specification

docs/containers.conf.5.md

@@ -490,6 +490,12 @@ Indicates if Podman is running inside a VM via Podman Machine.
 Podman uses this value to do extra setup around networking from the
 container inside the VM to to host.
 
+**machine_host_type**=""
+
+Indicates the type of machine if Podman is running inside a podman machine
+instance. The value is only relevant if machine_enabled is true. The default
+value (empty string) indicates the machine host type is unknown.
+
 **multi_image_archive**=false
 
 Allows for creating archives (e.g., tarballs) with more than one image. Some container engines, such as Podman, interpret additional arguments as tags for one image and hence do not store more than one image. The default behavior can be altered with this option.

pkg/config/config.go

@@ -304,6 +304,10 @@ type EngineConfig struct {
 	// MachineEnabled indicates if Podman is running in a podman-machine VM
 	MachineEnabled bool `toml:"machine_enabled,omitempty"`
 
+	// MachineHostType indicates the type of machine if Podman is running inside a
+	// podman-machine instance
+	MachineHostType string `toml:"machine_host_type,omitempty"`
+
 	// MultiImageArchive - if true, the container engine allows for storing
 	// archives (e.g., of the docker-archive transport) with multiple
 	// images.  By default, Podman creates single-image archives.

pkg/config/config_local_test.go

@@ -376,6 +376,18 @@ var _ = Describe("Config Local", func() {
 		gomega.Expect(config2.Engine.MachineEnabled).To(gomega.Equal(true))
 	})
 
+	It("Set Machine Type", func() {
+		// Given
+		config, err := NewConfig("")
+		gomega.Expect(err).To(gomega.BeNil())
+		gomega.Expect(config.Engine.MachineHostType).To(gomega.Equal(""))
+		// When
+		config2, err := NewConfig("testdata/containers_default.conf")
+		// Then
+		gomega.Expect(err).To(gomega.BeNil())
+		gomega.Expect(config2.Engine.MachineHostType).To(gomega.Equal("wsl"))
+	})
+
 	It("default netns", func() {
 		// Given
 		config, err := NewConfig("")

pkg/config/default.go

@@ -381,6 +381,7 @@ func defaultConfigFromMemory() (*EngineConfig, error) {
 	// constants.
 	c.LockType = "shm"
 	c.MachineEnabled = false
+	c.MachineHostType = ""
 	c.ChownCopiedFiles = true
 
 	return c, nil

pkg/config/testdata/containers_default.conf

@@ -156,6 +156,7 @@ env = ["super=duper", "foo=bar"]
 tmp_dir = "/run/libpod"
 
 machine_enabled = true
+machine_type = "wsl"
 
 # Whether to use chroot instead of pivot_root in the runtime
 no_pivot_root = false