Added Jenkins config and shellchecks.

Jenkinsfile

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+pipeline {
+	agent any
+
+	stages {
+		stage('ShellCheck') {
+			steps {
+				sh "check/shellcheck.sh"
+			}
+		}
+		stage('IndentationCheck') {
+			steps {
+				sh "check/indentationcheck.sh"
+			}
+		}
+	}
+	post {
+		always {
+			script {
+				recordIssues enabledForFailure: true, failOnError: true, qualityGates: [[threshold: 1, type: 'TOTAL', unstable: false]], tools: [checkStyle(name: 'ShellCheck')], trendChartType: 'NONE'
+			}
+		}
+		//failure {
+		//	mail to: '[email protected]',
+		//		subject: "Failed Jenkins build: ${currentBuild.fullDisplayName}",
+		//		body: "Something is wrong with ${env.BUILD_URL}"
+		//}
+	}
+}

check/indentationcheck.sh

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+#!/bin/bash
+
+#
+# Use either WORKSPACE location for Jenkins or
+# resolve path to scripts we need to check
+# when executed manualy outside Jenkins.
+#
+if [[ -z "${WORKSPACE:-}" ]]; then
+	MYDIR="$(cd -P "$(dirname "${0}")" && pwd)"
+	WORKSPACE="$(dirname ${MYDIR})"
+fi
+
+echo '#####################################################################################'
+echo '  Bash code must be indented with TABs. Checking for lines indented with spaces ... '
+echo '#####################################################################################'
+grep -n '^[[:space:]]* [[:space:]]*' "${WORKSPACE:-../}"/{bin,lib}/*.*sh
+grep_exit_status="${?}"
+if [[ "${grep_exit_status}" -eq 0 ]]; then
+	echo '#####################################################################################'
+	echo '  ERROR: found Bash files containing lines (partially) indented with spaces.'
+	echo '#####################################################################################'
+	exit 1
+elif [[ "${grep_exit_status}" -eq 1 ]]; then
+	echo '  Ok: all Bash files indented with TABs.'
+	echo '####################################################################################'
+	exit 0
+else
+	echo '  FAILED: indentation sanity check failed.'
+	echo '####################################################################################'
+	exit 1
+fi

check/shellcheck.sh

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+#!/bin/bash
+
+#
+# Disable some shellcheck warnings:
+#  * SC2004: $/${} is unnecessary on arithmetic variables.
+#            But for consistency we prefer to always use ${} anyway.
+#  * SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
+#            We know and use this construct regularly to create "transactions"
+#            where C is only executed when both A and B have succeeded.
+#
+export SHELLCHECK_OPTS="-e SC2004 -e SC2015"
+
+function showHelp() {
+	#
+	# Display commandline help on STDOUT.
+	#
+	cat <<EOH
+===============================================================================================================
+Script for sanity checking of Bash code of this repo using ShellCheck.
+Usage:
+	$(basename "${0}") OPTIONS
+Options:
+	-h	Show this help.
+	-v	Enables verbose output.
+===============================================================================================================
+EOH
+	exit 0
+}
+
+
+#
+# Parse commandline options
+#
+while getopts ":hv" opt
+do
+	case "${opt}" in
+		h)
+			showHelp
+			;;
+		v)
+			verbose='1'
+			;;
+		\?)
+			printf '%s\n' "FATAL: Invalid option -${OPTARG}. Try $(basename "${0}") -h for help."
+			exit 1
+			;;
+		:)
+			printf '%s\n' "FATAL: Option -${OPTARG} requires an argument. Try $(basename "${0}") -h for help."
+			exit 1
+			;;
+		*)
+			printf '%s\n' "FATAL Unhandled option. Try $(basename "${0}") -h for help."
+			exit 1
+			;;
+	esac
+done
+
+#
+# Check if ShellCheck is installed.
+#
+which shellcheck 2>&1 >/dev/null \
+	|| {
+		printf '%s\n' 'FATAL: cannot find shellcheck; make sure it is installed and can be found in ${PATH}.'
+		exit 1
+	}
+
+#
+# Run ShellCheck for all Bash scripts in the bin/ subdir.
+#  * Includes sourced files, so the libraries from the lib/ subfolder 
+#    are checked too as long a they are used in at least one script.
+#  * Select format and output based on whether this script is 
+#    executed by Jenkins or by a regular user.
+#
+if [[ -n "${WORKSPACE:-}" ]]
+then
+	#
+	# Exclude SC2154 (warning for variables that are referenced but not assigned),
+	# because we cannot easily resolve variables sourced from etc/*.cfg config files.
+	#
+	export SHELLCHECK_OPTS="${SHELLCHECK_OPTS} -e SC2154"
+	#
+	# ShellCheck for Jenkins.
+	#
+	shellcheck -a -x -o all -f checkstyle "${WORKSPACE}"/bin/*.sh | tee checkstyle-result.xml
+	#
+	# Reformat the generated report to add hyperlinks to the ShellCheck issues on the wiki:
+	#	https://github.com/koalaman/shellcheck/wiki/SC${ISSUENUMBER}
+	# explaining whatis wrong with the code / style and how to improve it.
+	#
+	perl -pi -e "s|message='([^']+)'\s+source='ShellCheck.(SC[0-9]+)'|message='&lt;a href=&quot;https://github.com/koalaman/shellcheck/wiki/\$2&quot;&gt;\$2: \$1&lt;/a&gt;' source='ShellCheck.\$2'|" checkstyle-result.xml
+else
+	#
+	# ShellCheck for regular user on the commandline.
+	#
+	MYDIR="$(cd -P "$(dirname "${0}")" && pwd)"
+	if [[ "${verbose:-0}" -eq 1 ]]
+	then
+		cd "${MYDIR}/.."
+		shellcheck -a -x -o all -f tty bin/*.sh # cannot use the printf construct used below for non-vebose output as it destroys the terminal colors.
+		cd '-' # Goes back to previous directory before we changed to ${MYDIR}.
+	else
+		printf '%s\n' "$(cd "${MYDIR}/.." && shellcheck -a -x -o all -f gcc bin/*.sh)"
+	fi
+fi