Add checkFunctions.sh

It holds all the centralized "check" functions used by multiple scripts.

scripts/checkFunctions.sh

@@ -0,0 +1,101 @@
+#!/bin/bash
+
+# Functions that check various things and are used in multiple other scripts.
+
+
+####
+# Check if we can connect to a web site via URL.
+function _check_web_connectivity()
+{
+	local OK  URL  FROM  ERR=""
+
+	OK="true"
+	URL=""
+	FROM=""
+	while [[ $# -gt 0 ]]
+	do
+		ARG="${1}"
+		case "${ARG,,}" in
+			"--website" | "--server")
+				URL="$( settings ".remote${ARG/--/}url" )"
+				;;
+			"--from")
+				FROM="${2}"
+				shift
+				;;
+			"--url")
+				URL="${2}"
+				shift
+				;;
+			*)
+				ERR="Unknown argument: '${ARG}'\n"
+				OK="false"
+				;;
+		esac
+		shift
+	done
+	if [[ ${OK} == "false" || -z ${URL} ]]; then
+		echo -e "${ERR}Usage: ${FUNCNAME[0]}: [--from f] --website w | --server s | --url u"
+		return 1
+	fi
+
+	local HTTP_STATUS  RET  MSG  WHY  HOST
+
+	HTTP_STATUS="$( curl -o /dev/null --head --silent --location --write-out "%{http_code}" "${URL}" )"
+	RET=$?
+	if [[ ${RET} -ne 0 ]] ; then
+		case "${RET}" in
+			# Just do common ones
+			3)
+				WHY="The URL appears bad: ${URL}"
+				;;
+			6)
+				# Only should the host name.
+				HOST="${URL/*\/\//}"
+				WHY="Unknown host:   ${HOST/\/*/}"
+				;;
+			*)
+				WHY="Return code ${RET} from curl"
+				;;
+		esac
+
+	elif [[ ${HTTP_STATUS} == "403" ]] ; then
+		# If this is a brand new Website with no files yet, OR
+		# the user moved/removed all the old files,
+		# there won't be a default web file so in most cases we'll get a "403 Forbidden".
+		# That means connectivity to the Website DOES work.
+
+		# TODO: There may be other HTTP_STATUS that indicate we connected...
+		# Probably not 404 - that tells us connectivity to the SERVER worked,
+		# but not to the WEBSITE.
+
+		MSG="Got HTTP_STATUS ${HTTP_STATUS} from ${URL}; connectivity worked."
+		[[ ${FROM} == "install" ]] && display_msg --logonly info "${MSG}"
+		return "${EXIT_PARTIAL_OK}"		# partial because it has basic connectivity only
+
+	else
+		case "${HTTP_STATUS}" in
+			"")
+				WHY="Unknown reason"
+				;;
+			"000")
+				WHY="Unknown HTML code ${HTTP_STATUS}"
+				;;
+			"200")
+				return 0
+				;;
+			"404")
+				WHY="Website not found (code ${HTTP_STATUS})"
+				;;
+			5*)
+				WHY="Server error (code ${HTTP_STATUS})"
+				;;
+			*)
+				WHY="HTML code ${HTTP_STATUS}"
+				;;
+		esac
+	fi
+
+	echo -e "Unable to connect to ${URL}\n   ${WHY}"
+	return 1
+}