Merge pull request #1265 from ashley-cui/machvol

Add to default machine volumes for MacOS

common/docs/containers.conf.5.md

@@ -745,6 +745,8 @@ Environment variables like $HOME as well as complete paths are supported for
 the source and destination. An optional third field `:ro` can be used to
 tell the container engines to mount the volume readonly.
 
+On Mac, the default volumes are: `"/Users:/Users", "/private:/private", "/var/folders:/var/folders"`
+
 # FILES
 
 **containers.conf**

common/pkg/config/default_darwin.go

@@ -14,5 +14,9 @@ func getLibpodTmpDir() string {
 
 // getDefaultMachineVolumes returns default mounted volumes (possibly with env vars, which will be expanded)
 func getDefaultMachineVolumes() []string {
-	return []string{"$HOME:$HOME"}
+	return []string{
+		"/Users:/Users",
+		"/private:/private",
+		"/var/folders:/var/folders",
+	}
 }