fix(scripts): fix rhel and alpine init scripts (#919)

Systemd systems may not have access to the functions file provided by
initscripts. The code from initscripts is provided under the GNU v2
license and will not be pulled in.

Additionally, a header comment block must be added, using
https://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/initscrcomconv.html
for specs

---------

Co-authored-by: Michal Nowacki <[email protected]>

Author: ZNeumann

agent/scripts/init.alpine

@@ -1,10 +1,9 @@
+#!/sbin/openrc-run
 #
 # Copyright 2020 New Relic Corporation. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 #
 
-#!/sbin/openrc-run
-
 description="New Relic Daemon"
 command="${nrdaemon:-/usr/bin/newrelic-daemon}"
 command_args=

agent/scripts/init.rhel

@@ -10,6 +10,15 @@
 # processname: newrelic-daemon
 # config:      /etc/newrelic/newrelic.cfg
 #
+### BEGIN INIT INFO
+# Provides:          newrelic-daemon
+# Required-Start:    $all
+# Required-Stop:
+# Default-Start:     2 3 4 5
+# Default-Stop:	     0 1 6
+# Description: The New Relic Daemon is used by the New Relic PHP Agent to communicate
+#               with the New Relic Backend
+### END INIT INFO
 
 LANG=C
 NAME=newrelic-daemon
@@ -18,7 +27,11 @@ DESC="New Relic Daemon"
 #
 # Source function library.
 #
-. /etc/init.d/functions
+has_initd_functions=0
+if [ -f /etc/init.d/functions ]; then
+  . /etc/init.d/functions
+  has_initd_functions=1
+fi
 
 ulimit -n 2048 > /dev/null 2>&1
 
@@ -223,14 +236,22 @@ EOF
 
   if running ; then
     if [ -z "${NR_SILENT}" -a -z "${SILENT}" ]; then
-      success
-      echo
+      if [ $has_initd_functions -eq 1 ]; then
+        success
+        echo
+      else
+        echo " [  OK  ]"
+      fi
     fi
     return 0
   else
     if [ -z "${NR_SILENT}" -a -z "${SILENT}" ]; then
-      failure
-      echo
+      if [ $has_initd_functions -eq 1 ]; then
+        failure
+        echo
+      else
+        echo " [FAILED]"
+      fi
     fi
     return 1
   fi
@@ -274,14 +295,22 @@ stop() {
 
     if running ; then
       if [ -z "${NR_SILENT}" -a -z "${SILENT}" ]; then
-        failure
-        echo
+        if [ $has_initd_functions -eq 1 ]; then
+          failure
+          echo
+        else
+          echo " [FAILED]"
+        fi
       fi
       return 1
     else
       if [ -z "${NR_SILENT}" -a -z "${SILENT}" ]; then
-        success
-        echo
+        if [ $has_initd_functions -eq 1 ]; then
+          success
+          echo
+        else
+          echo " [  OK  ]"
+        fi
       fi
       return 0
     fi