Add ability for service to report the system managing the service (#147)

* Add ability for service to report the system managing the service

* Clarify that the output of SystemName should return the same value as Platform in most cases

* Rename SystemName to Platform to match the rest of the package

* be a little more clear in the Platform comment

service.go

@@ -347,6 +347,10 @@ type Service interface {
 	// otherwise the name.
 	String() string
 
+	// Platform displays the name of the system that manages the service.
+	// In most cases this will be the same as service.Platform().
+	Platform() string
+
 	// Status returns the current service status.
 	Status() (Status, error)
 }

service_darwin.go

@@ -77,6 +77,10 @@ func (s *darwinLaunchdService) String() string {
 	return s.Name
 }
 
+func (s *darwinLaunchdService) Platform() string {
+	return version
+}
+
 func (s *darwinLaunchdService) getHomeDir() (string, error) {
 	u, err := user.Current()
 	if err == nil {

service_linux.go

@@ -13,7 +13,7 @@ type linuxSystemService struct {
 	name        string
 	detect      func() bool
 	interactive func() bool
-	new         func(i Interface, c *Config) (Service, error)
+	new         func(i Interface, platform string, c *Config) (Service, error)
 }
 
 func (sc linuxSystemService) String() string {
@@ -26,7 +26,7 @@ func (sc linuxSystemService) Interactive() bool {
 	return sc.interactive()
 }
 func (sc linuxSystemService) New(i Interface, c *Config) (Service, error) {
-	return sc.new(i, c)
+	return sc.new(i, sc.String(), c)
 }
 
 func init() {

service_systemd_linux.go

@@ -24,14 +24,16 @@ func isSystemd() bool {
 }
 
 type systemd struct {
-	i Interface
+	i        Interface
+	platform string
 	*Config
 }
 
-func newSystemdService(i Interface, c *Config) (Service, error) {
+func newSystemdService(i Interface, platform string, c *Config) (Service, error) {
 	s := &systemd{
-		i:      i,
-		Config: c,
+		i:        i,
+		platform: platform,
+		Config:   c,
 	}
 
 	return s, nil
@@ -44,6 +46,10 @@ func (s *systemd) String() string {
 	return s.Name
 }
 
+func (s *systemd) Platform() string {
+	return s.platform
+}
+
 // Systemd services should be supported, but are not currently.
 var errNoUserServiceSystemd = errors.New("User services are not supported on systemd.")
 

service_sysv_linux.go

@@ -16,14 +16,16 @@ import (
 )
 
 type sysv struct {
-	i Interface
+	i        Interface
+	platform string
 	*Config
 }
 
-func newSystemVService(i Interface, c *Config) (Service, error) {
+func newSystemVService(i Interface, platform string, c *Config) (Service, error) {
 	s := &sysv{
-		i:      i,
-		Config: c,
+		i:        i,
+		platform: platform,
+		Config:   c,
 	}
 
 	return s, nil
@@ -36,6 +38,10 @@ func (s *sysv) String() string {
 	return s.Name
 }
 
+func (s *sysv) Platform() string {
+	return s.platform
+}
+
 var errNoUserServiceSystemV = errors.New("User services are not supported on SystemV.")
 
 func (s *sysv) configPath() (cp string, err error) {

service_upstart_linux.go

@@ -31,14 +31,16 @@ func isUpstart() bool {
 }
 
 type upstart struct {
-	i Interface
+	i        Interface
+	platform string
 	*Config
 }
 
-func newUpstartService(i Interface, c *Config) (Service, error) {
+func newUpstartService(i Interface, platform string, c *Config) (Service, error) {
 	s := &upstart{
-		i:      i,
-		Config: c,
+		i:        i,
+		platform: platform,
+		Config:   c,
 	}
 
 	return s, nil
@@ -51,6 +53,10 @@ func (s *upstart) String() string {
 	return s.Name
 }
 
+func (s *upstart) Platform() string {
+	return s.platform
+}
+
 // Upstart has some support for user services in graphical sessions.
 // Due to the mix of actual support for user services over versions, just don't bother.
 // Upstart will be replaced by systemd in most cases anyway.

service_windows.go

@@ -145,6 +145,10 @@ func (ws *windowsService) String() string {
 	return ws.Name
 }
 
+func (ws *windowsService) Platform() string {
+	return version
+}
+
 func (ws *windowsService) setError(err error) {
 	ws.errSync.Lock()
 	defer ws.errSync.Unlock()