machine: Add -all-providers flag to machine list

Podman machine list now supports a new option, --all-providers, which lists all machines from all providers.

Signed-off-by: Ashley Cui <acui@redhat.com>

pkg/machine/provider/platform_darwin.go

@@ -42,11 +42,11 @@ func Get() (vmconfigs.VMProvider, error) {
 	}
 }
 
-func GetAll(_ bool) ([]vmconfigs.VMProvider, error) {
+func GetAll() []vmconfigs.VMProvider {
 	return []vmconfigs.VMProvider{
 		new(applehv.AppleHVStubber),
 		new(libkrun.LibKrunStubber),
-	}, nil
+	}
 }
 
 // SupportedProviders returns the providers that are supported on the host operating system
@@ -58,27 +58,23 @@ func SupportedProviders() []define.VMType {
 	return supported
 }
 
-// InstalledProviders returns the supported providers that are installed on the host
-func InstalledProviders() ([]define.VMType, error) {
-	installed := []define.VMType{}
-
-	appleHvInstalled, err := appleHvInstalled()
-	if err != nil {
-		return nil, err
+func IsInstalled(provider define.VMType) (bool, error) {
+	switch provider {
+	case define.AppleHvVirt:
+		ahv, err := appleHvInstalled()
+		if err != nil {
+			return false, err
+		}
+		return ahv, nil
+	case define.LibKrun:
+		lkr, err := libKrunInstalled()
+		if err != nil {
+			return false, err
+		}
+		return lkr, nil
+	default:
+		return false, nil
 	}
-	if appleHvInstalled {
-		installed = append(installed, define.AppleHvVirt)
-	}
-
-	libKrunInstalled, err := libKrunInstalled()
-	if err != nil {
-		return nil, err
-	}
-	if libKrunInstalled {
-		installed = append(installed, define.LibKrun)
-	}
-
-	return installed, nil
 }
 
 func appleHvInstalled() (bool, error) {