From 66ad72af4c733ae123e7ec0187c9b83f9621666c Mon Sep 17 00:00:00 2001
From: Christoph <ckubu@oopen.de>
Date: Thu, 27 Dec 2018 17:49:50 +0100
Subject: [PATCH] check_webservice_load.sh: don't start/stop services if
 package management (apt,dpkg,..) ist running.

---
 check_postfix.sh | 107 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 91 insertions(+), 16 deletions(-)

diff --git a/check_postfix.sh b/check_postfix.sh
index 2629e21..c65f28d 100755
--- a/check_postfix.sh
+++ b/check_postfix.sh
@@ -82,6 +82,35 @@ ok (){
    echo ""
 }
 
+detect_os () {
+
+   if $(which lsb_release > /dev/null 2>&1) ; then
+
+      os_dist="$(lsb_release -i | awk '{print tolower($3)}')"
+      os_version="$(lsb_release -r | awk '{print tolower($2)}')"
+      os_codename="$(lsb_release -c | awk '{print tolower($2)}')"
+
+      if [[ "$os_dist" = "debian" ]]; then
+         if $(echo "$os_version" | grep -q '\.') ; then
+            os_version=$(echo "$os_version" | cut --delimiter='.' -f1)
+         fi
+      fi
+
+   elif [[ -e "/etc/os-release" ]]; then
+
+      . /etc/os-release
+
+      os_dist=$ID
+      os_version=${VERSION_ID}
+
+   fi
+
+   # remove whitespace from os_dist and os_version
+   os_dist="${os_dist// /}"
+   os_version="${os_version// /}"
+
+}
+
 trim() {
     local var="$*"
     var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
@@ -124,6 +153,10 @@ else
    fi
 fi
 
+# - Detect linux distribution
+# -
+detect_os
+
 
 #---------------------------------------
 #-----------------------------
@@ -138,31 +171,73 @@ fi
 if ! ps -e f | grep -E "[[:digit:]]\ ${check_string_ps}" | grep -v grep > /dev/null ; then
    error "Postfix Mailservice seems to be down! Trying to restart service now.."
 
+
    if $systemd_supported ; then
       $systemctl daemon-reload > /dev/null 2> ${LOCK_DIR}/err_msg.log
       if [[ $? -ne 0 ]]; then
          error "$(cat ${LOCK_DIR}/err_msg.log)"
       fi
       sleep 2
-      $systemctl stop postfix > /dev/null 2> ${LOCK_DIR}/err_msg.log
-      if [[ $? -ne 0 ]]; then
-         error "$(cat ${LOCK_DIR}/err_msg.log)"
-      fi
-      sleep 10
-      $systemctl start postfix > /dev/null 2> ${LOCK_DIR}/err_msg.log
-      if [[ $? -ne 0 ]]; then
-         error "$(cat ${LOCK_DIR}/err_msg.log)"
+
+      # - Don't Start/Stop Services if package management is running (apt,aptitude,dpkg)
+      # -
+      if [[ "${os_dist,,}" = "debian" ]] || [[ "${os_dist,,}" = "ubuntu" ]] ; then
+         if $(lsof /var/lib/dpkg/lock >/dev/null 2>&1) ; then
+            warn "It seems that package management (apt,dpkg) is running. Exiting restarting the service .."
+         else
+            $systemctl stop postfix > /dev/null 2> ${LOCK_DIR}/err_msg.log
+            if [[ $? -ne 0 ]]; then
+               error "$(cat ${LOCK_DIR}/err_msg.log)"
+            fi
+
+            sleep 10
+
+            # - Don't Start/Stop Services if package management is running (apt,aptitude,dpkg)
+            # -
+            if [[ "${os_dist,,}" = "debian" ]] || [[ "${os_dist,,}" = "ubuntu" ]] ; then
+               if $(lsof /var/lib/dpkg/lock >/dev/null 2>&1) ; then
+                  warn "It seems that package management (apt,dpkg) is running. Omit starting the service .."
+               else
+                  $systemctl start postfix > /dev/null 2> ${LOCK_DIR}/err_msg.log
+                  if [[ $? -ne 0 ]]; then
+                     error "$(cat ${LOCK_DIR}/err_msg.log)"
+                  fi
+               fi
+            fi
+         fi
       fi
+
    else
-      $postfix_init_script stop > /dev/null 2>&1
-      if [[ $? -ne 0 ]]; then
-         error "Stopping Postfix Mailservice failed!"
-      fi
-      sleep 10
-      $postfix_init_script start > /dev/null 2>&1
-      if [[ $? -ne 0 ]]; then
-         error "Starting Postfix Mailservice failed!"
+
+      # - Don't Start/Stop Services if package management is running (apt,aptitude,dpkg)
+      # -
+      if [[ "${os_dist,,}" = "debian" ]] || [[ "${os_dist,,}" = "ubuntu" ]] ; then
+         if $(lsof /var/lib/dpkg/lock >/dev/null 2>&1) ; then
+            warn "It seems that package management (apt,dpkg) is running - Exiting restarting the service .."
+         else
+            $postfix_init_script stop > /dev/null 2>&1
+            if [[ $? -ne 0 ]]; then
+               error "Stopping Postfix Mailservice failed!"
+            fi
+
+            sleep 10
+
+            # - Don't Start/Stop Services if package management is running (apt,aptitude,dpkg)
+            # -
+            if [[ "${os_dist,,}" = "debian" ]] || [[ "${os_dist,,}" = "ubuntu" ]] ; then
+               if $(lsof /var/lib/dpkg/lock >/dev/null 2>&1) ; then
+                  warn "It seems that package management (apt,dpkg) is running. Omit starting the service .."
+               else
+                  $postfix_init_script start > /dev/null 2>&1
+                  if [[ $? -ne 0 ]]; then
+                     error "Starting Postfix Mailservice failed!"
+                  fi
+               fi
+            fi
+
+         fi
       fi
+
    fi
 
    declare -i counter=0