From b5a376f7a2c1eadc3bf86cd88c486be3a6d25820 Mon Sep 17 00:00:00 2001
From: Christoph <ckubu@oopen.de>
Date: Sat, 26 Sep 2020 11:28:57 +0200
Subject: [PATCH] Add script 'check_if_service_exists.sh'.

---
 snippets/check_if_service_exists.sh | 257 ++++++++++++++++++++++++++++
 1 file changed, 257 insertions(+)
 create mode 100755 snippets/check_if_service_exists.sh

diff --git a/snippets/check_if_service_exists.sh b/snippets/check_if_service_exists.sh
new file mode 100755
index 0000000..7f36926
--- /dev/null
+++ b/snippets/check_if_service_exists.sh
@@ -0,0 +1,257 @@
+#!/usr/bin/env bash
+
+script_name="$(basename $(realpath $0))"
+working_dir="$(dirname $(realpath $0))"
+
+conf_file="${working_dir}/conf/${script_name%%.*}.conf"
+
+LOCK_DIR="/tmp/$(basename $0).$$.LOCK"
+log_file="${LOCK_DIR}/${script_name%%.*}.log"
+
+SERVICE_NAME="$1"
+
+
+
+# ----------
+# Main function - checks if service exists
+# ----------
+
+service_exists() {
+    local n=$1
+    if [[ $(systemctl list-units --all -t service --full --no-legend "$n.service" | cut -f1 -d' ') == $n.service ]]; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+
+# ----------
+# Base Function(s)
+# ----------
+
+usage() {
+
+
+   [[ -n  "$1" ]] && error "$1"
+
+
+   [[ $terminal ]] && echo -e "
+\033[1mUsage:\033[m
+
+   $(basename $0) <service-name>
+
+\033[1mDescription\033[m
+
+   Script checks if a given Service exists .
+
+\033[1mOptions\033[m
+
+   No Options needed. The clear password will be asked for.
+
+\033[1mFiles\033[m
+
+   No configuration files needed
+
+\033[1mExample:\033[m
+
+   Create a saltet SHA512 password hash
+
+      $(basename $0) apache2
+
+"
+
+   clean_up 1
+
+}
+
+clean_up() {
+
+   # Perform program exit housekeeping
+   rm -rf "$LOCK_DIR"
+   blank_line
+   exit $1
+}
+
+
+echononl(){
+   if $terminal ; then
+      echo X\\c > /tmp/shprompt$$
+      if [ `wc -c /tmp/shprompt$$ | awk '{print $1}'` -eq 1 ]; then
+         echo -e -n "   $*\\c" 1>&2
+      else
+         echo -e -n "   $*" 1>&2
+      fi
+      rm /tmp/shprompt$$
+   fi
+}
+
+
+fatal(){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mFatal\033[m ] $*"
+   else
+      echo -e "   [ Fatal ] $*"
+   fi
+   echo ""
+   if $terminal ; then
+      echo -e "             \033[1mScript terminated\033[m.."
+   else
+      echo -e "             Script terminated.."
+   fi
+   echo ""
+   rm -rf $LOCK_DIR
+   exit 1
+}
+
+error (){
+   echo ""
+   if $terminal ; then
+      echo -e "   [ \033[31m\033[1mError\033[m ] $*"
+   else
+      echo "   [ Error ] $*"
+   fi
+   echo ""
+}
+
+warn (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[33m\033[1mWarn\033[m ]  $*"
+      else
+         echo "   [ Warn ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+info (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mInfo\033[m ]  $*"
+      else
+         echo "   [ Info ]  $*"
+      fi
+      echo ""
+   fi
+}
+
+ok (){
+   if $LOGGING || $terminal ; then
+      echo ""
+      if $terminal ; then
+         echo -e "   [ \033[32m\033[1mOk\033[m ]    $*"
+      else
+         echo "   [ Ok ]    $*"
+      fi
+      echo ""
+   fi
+}
+
+echo_done() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mdone\033[m ]"
+   fi
+}
+echo_ok() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[32mok\033[m ]"
+   fi
+}
+echo_failed(){
+   if $terminal ; then
+      echo -e "\033[75G[ \033[1;31mfailed\033[m ]"
+   fi
+}
+echo_skipped() {
+   if $terminal ; then
+      echo -e "\033[75G[ \033[33m\033[1mskipped\033[m ]"
+   fi
+}
+echo_wait(){
+   if $terminal ; then
+      echo -en "\033[75G[ \033[5m\033[1m...\033[m ]"
+   fi
+}
+
+trim() {
+    local var="$*"
+    var="${var#"${var%%[![:space:]]*}"}"   # remove leading whitespace characters
+    var="${var%"${var##*[![:space:]]}"}"   # remove trailing whitespace characters
+    echo -n "$var"
+}
+
+blank_line() {
+   if $terminal ; then
+      echo ""
+   fi
+}
+
+
+
+# ----------
+# - Jobhandling 
+# ----------
+
+# - Run 'clean_up' for signals SIGHUP SIGINT SIGTERM
+# -
+trap clean_up SIGHUP SIGINT SIGTERM
+
+# - Create lock directory '$LOCK_DIR"
+#
+mkdir "$LOCK_DIR"
+
+
+# ----------
+# - Some checks ..
+# ----------
+
+# - Running in a terminal?
+# -
+if [[ -t 1 ]] ; then
+   terminal=true
+else
+	fatal "Script must run in a terminal."
+fi
+
+# - Print help?
+# -
+if [[ "$(trim $*)" = "-h" ]] || [[ "$(trim $*)" = "--help" ]] ; then
+    usage
+fi
+
+if [[ -z "$(which basename)" ]]; then
+   fatal 'It seems "basename" is not installed, but needed!'
+fi
+
+if [[ -z "$(which realpath)" ]]; then
+   fatal 'It seems "realpath" is not installed, but needed!'
+fi
+
+
+# ==========
+# - Begin Main Script
+# ==========
+
+# ----------
+# - Headline
+# ----------
+
+if $terminal ; then
+   echo ""
+   echo -e "\033[1m----------\033[m"
+   echo -e "\033[32m\033[1mRunning script \033[m\033[1m$script_name\033[32m .. \033[m"
+   echo -e "\033[1m----------\033[m"
+fi
+
+blank_line
+if service_exists $SERVICE_NAME ; then
+   echo -e "\t\033[32mService \033[1m$SERVICE_NAME\033[m\033[32m exists\033[m"
+else
+   echo -e "\t\033[33mService \033[1m$SERVICE_NAME\033[m\033[33m does NOT exists\033[m"
+fi
+
+clean_up 0