start-as-root option added in service spec files.

services/nginx.spec

@@ -3,7 +3,7 @@ consumes: http?
 provides: www, http
 ports: http=80, https=443
 reload-command: kill -HUP ${SERVICE_PID}
-user: root
+start-as-root: true
 
 %configuration nginx.conf
 

src/service/service.cr

@@ -347,7 +347,9 @@ class Service
 			LibC.dup2 stdout_file.fd, 1
 			LibC.dup2 stderr_file.fd, 2
 
-			System.become_user user_name
+			unless @reference.start_as_root
+				System.become_user user_name
+			end
 
 			Process.exec command, args,
 				chdir: (@reference.directory.try { |x| evaluate x } || root),

src/service/service_definition.cr

@@ -82,6 +82,7 @@ class ServiceDefinition
 	getter directory : String?
 	getter user : String?
 	getter group : String?
+	getter start_as_root : Bool?
 	getter provides : String?
 	getter consumes : Array(Consumes)
 	getter environment_variables : Array(String)
@@ -103,6 +104,7 @@ class ServiceDefinition
 		@directory     = specs["directory"]?.try &.as_s
 		@user          = specs["user"]?.try &.as_s
 		@group         = specs["group"]?.try &.as_s
+		@start_as_root = specs["start-as-root"]?.try(&.as_s).try(&.==("true")) || false
 		@provides      = specs["provides"]?.try &.as_a_or_s.map { |x| Provides.new x } || Array(Provides).new
 		@consumes      = specs["consumes"]?.try &.as_a_or_s.map { |x| Consumes.new x } || Array(Consumes).new
 		@environment_variables = specs["environment-variables"]?.try &.as_a_or_s || Array(String).new