From 9192318bc485549c70f154eb9c336968b9a0f33d Mon Sep 17 00:00:00 2001
From: Randy Coburn <morfien101@gmail.com>
Date: Tue, 15 Oct 2019 16:17:03 +0200
Subject: [PATCH] pulling in https://github.com/kardianos/service/pull/94

---
 service.go               | 11 +++++++----
 service_systemd_linux.go |  3 +++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/service.go b/service.go
index a1304019..4dd2097c 100644
--- a/service.go
+++ b/service.go
@@ -78,10 +78,12 @@ const (
 	optionLogOutput            = "LogOutput"
 	optionLogOutputDefault     = false
 
-	optionRunWait      = "RunWait"
-	optionReloadSignal = "ReloadSignal"
-	optionPIDFile      = "PIDFile"
-	optionRestart      = "Restart"
+	optionRunWait            = "RunWait"
+	optionReloadSignal       = "ReloadSignal"
+	optionPIDFile            = "PIDFile"
+	optionRestart            = "Restart"
+	optionLimitNOFILE        = "LimitNOFILE"
+	optionLimitNOFILEDefault = -1 // -1 = don't set in configuration
 
 	optionSuccessExitStatus = "SuccessExitStatus"
 
@@ -141,6 +143,7 @@ type Config struct {
 	//    - RunWait       func() (wait for SIGNAL)  - Do not install signal but wait for this function to return.
 	//    - ReloadSignal  string () [USR1, ...]     - Signal to send on reaload.
 	//    - PIDFile       string () [/run/prog.pid] - Location of the PID file.
+	//    - LimitNOFILE	  int - Maximum open files (ulimit -n) (https://serverfault.com/questions/628610/increasing-nproc-for-processes-launched-by-systemd-on-centos-7)
 	//    - LogOutput     bool   (false)            - Redirect StdErr & StdOut to files.
 	//    - Restart       string (always)           - How shall service be restarted.
 	//    - SuccessExitStatus string ()             - The list of exit status that shall be considered as successful,
diff --git a/service_systemd_linux.go b/service_systemd_linux.go
index 99c5e2a8..2a29407f 100644
--- a/service_systemd_linux.go
+++ b/service_systemd_linux.go
@@ -152,6 +152,7 @@ func (s *systemd) Install() error {
 		Restart              string
 		SuccessExitStatus    string
 		LogOutput            bool
+		LimitNOFILE          int
 	}{
 		s.Config,
 		path,
@@ -161,6 +162,7 @@ func (s *systemd) Install() error {
 		s.Option.string(optionRestart, "always"),
 		s.Option.string(optionSuccessExitStatus, ""),
 		s.Option.bool(optionLogOutput, optionLogOutputDefault),
+		s.Option.int(optionLimitNOFILE, optionLimitNOFILEDefault),
 	}
 
 	err = s.template().Execute(f, to)
@@ -260,6 +262,7 @@ ExecStart={{.Path|cmdEscape}}{{range .Arguments}} {{.|cmd}}{{end}}
 {{if .UserName}}User={{.UserName}}{{end}}
 {{if .ReloadSignal}}ExecReload=/bin/kill -{{.ReloadSignal}} "$MAINPID"{{end}}
 {{if .PIDFile}}PIDFile={{.PIDFile|cmd}}{{end}}
+{{if gt .LimitNOFILE -1 }}LimitNOFILE={{.LimitNOFILE}}{{end}}
 {{if and .LogOutput .HasOutputFileSupport -}}
 StandardOutput=file:/var/log/{{.Name}}.out
 StandardError=file:/var/log/{{.Name}}.err