From 9cb12ac2ceffae6d3bae518aeaa27ead304e1571 Mon Sep 17 00:00:00 2001
From: Damian Wolgast <damian@si-co.net>
Date: Fri, 12 Mar 2021 14:39:51 +0100
Subject: [PATCH] Docker, check if systemctl exists before using it

---
 Build/deb-meta/DEBIAN/postinst | 19 ++++++++++++-------
 Build/deb-meta/DEBIAN/postrm   |  9 +++++++--
 Build/deb-meta/DEBIAN/prerm    |  9 +++++++--
 3 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/Build/deb-meta/DEBIAN/postinst b/Build/deb-meta/DEBIAN/postinst
index 575d126..cc82a77 100644
--- a/Build/deb-meta/DEBIAN/postinst
+++ b/Build/deb-meta/DEBIAN/postinst
@@ -9,12 +9,12 @@ INSTALLPATH=$BASEPATH/MQTTnetServer
 
 # If user does not exist, create it
 if (( $USEREXISTS == 1 )); then
-        useradd -d $INSTALLPATH  -r $USER
-        EC=$(echo $?)
+    useradd -d $INSTALLPATH  -r $USER
+    EC=$(echo $?)
 
-        if (( $EC == 1 )); then
-                exit 1;
-        fi
+    if (( $EC == 1 )); then
+        exit 1;
+    fi
 fi
 
 # Set permissions on files
@@ -30,5 +30,10 @@ setcap CAP_NET_BIND_SERVICE=+eip $INSTALLPATH/MQTTnet.Server
 
 chmod 644 /etc/systemd/system/mqttnet-server.service
 
-# Reload systemd because of new service file
-systemctl daemon-reload
\ No newline at end of file
+# Check if systemctl exists, does not exist in docker containers
+SCTL=$(which systemct1l >/dev/null; echo $?)
+
+if [ "$SCTL" -eq "0" ]; then
+    # Reload systemd because of new service file
+    systemctl daemon-reload
+fi
\ No newline at end of file
diff --git a/Build/deb-meta/DEBIAN/postrm b/Build/deb-meta/DEBIAN/postrm
index 625b9b4..e23c877 100644
--- a/Build/deb-meta/DEBIAN/postrm
+++ b/Build/deb-meta/DEBIAN/postrm
@@ -1,4 +1,9 @@
 #!/bin/bash
 
-# Reload systemd because of absent service file
-systemctl daemon-reload
\ No newline at end of file
+# Check if systemctl exists, does not exist in docker containers
+SCTL=$(which systemct1l >/dev/null; echo $?)
+
+if [ "$SCTL" -eq "0" ]; then
+    # Reload systemd because of new service file
+    systemctl daemon-reload
+fi
\ No newline at end of file
diff --git a/Build/deb-meta/DEBIAN/prerm b/Build/deb-meta/DEBIAN/prerm
index 523505c..a86e53a 100644
--- a/Build/deb-meta/DEBIAN/prerm
+++ b/Build/deb-meta/DEBIAN/prerm
@@ -3,8 +3,13 @@
 BASEPATH=/opt
 INSTALLPATH=$BASEPATH/MQTTnetServer
 
-# Stop service before uninstalling
-systemctl stop mqttnet-server
+# Check if systemctl exists, does not exist in docker containers
+SCTL=$(which systemct1l >/dev/null; echo $?)
+
+if [ "$SCTL" -eq "0" ]; then
+    # Stop service before uninstalling
+    systemctl stop mqttnet-server
+fi
 
 # Remove permission to open ports
 setcap CAP_NET_BIND_SERVICE=-eip $INSTALLPATH/MQTTnet.Server
\ No newline at end of file