Further development into CIS (core infrastructure system)

core/printOwnDomain.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+#WARNING: Used for core functionality in setup.sh
+#         DO NOT rename the script and test changes well!
+
+
+
+# Folders always ends with an tailing '/'
+_SCRIPT="$(readlink -f "${0}" 2> /dev/null)"
+_CIS_ROOT="${_SCRIPT%%/core/*}/"               #Removes longest  matching pattern '/core/*' from the end
+_OVERRIDE_DOMAIN_FILE="${_CIS_ROOT:?"Missing CIS_ROOT"}overrideOwnDomain"
+
+# There has to be one dot at least.
+_BOOT_DOMAIN="$(hostname -b | grep -F '.' | cut -d. -f2-)"
+
+# Take OVERRIDING_DOMAIN_FILE without empty lines and comments, then take the first line without leading spaces
+_OVERRIDE_DOMAIN="$(grep -vE '^[[:space:]]*$|^[[:space:]]*#' "${_OVERRIDE_DOMAIN_FILE}" 2> /dev/null | head -n 1 | xargs)"
+
+! [ -z "${_OVERRIDE_DOMAIN}" ] \
+    && [ "${_OVERRIDE_DOMAIN}" != "${_BOOT_DOMAIN}" ] \
+    && echo "WARNING: Domain has been overridden by: ${_OVERRIDE_DOMAIN_FILE}" >&2 \
+    && echo "${_OVERRIDE_DOMAIN}" \
+    && exit 0
+
+! [ -z "${_BOOT_DOMAIN}" ] \
+    && echo "${_BOOT_DOMAIN}" \
+    && exit 0
+
+echo "It was impossible to find out the domain of this host, please prepare this host first." >&2
+exit 1