Determine if settings.json is linked properly

allsky.sh

@@ -171,6 +171,35 @@ else
 		"${NOT_STARTED_MSG}<br>${MSG}"
 fi
 
+# Make sure the settings file is linked to the camera-specific file.
+if ! SETTINGS_LINK="$( get_links "${SETTINGS_FILE}" )" ; then
+	MSG="The settings file (${SETTINGS_FILE}) is not linked to"
+	MSG="${MSG} a camera-specific file; any setting changes you make will not"
+	MSG="${MSG} be saved if you switch cameras."
+	MSG="${MSG}\nERROR: ${SETTINGS_LINK}."
+	# TODO: Tell them how to fix it.
+	"${ALLSKY_SCRIPTS}/addMessage.sh" "error" "${MSG}"
+	echo "ERROR: Settings file (${SETTINGS_FILE}) not linked to camera-specific file." >&2
+else
+	# Make sure it's linked to the correct file.
+	SETTINGS_LINK="$( basename "${SETTINGS_LINK}" )"
+	FILE="${SETTINGS_FILE%.*}"
+	EXT="${SETTINGS_FILE##*.}"
+	CORRECT_NAME="$( basename "${FILE}_${CAMERA_TYPE}_${CAMERA_MODEL}.${EXT}" )"
+	if [[ ${SETTINGS_LINK} != "${CORRECT_NAME}" ]]; then
+		MSG="The settings file (${SETTINGS_FILE}) is not properly linked to"
+		MSG="${MSG} its camera-specific file; any setting changes you make will not"
+		MSG="${MSG} be saved if you switch cameras."
+		MSG="${MSG}\nIt is linked to:"
+		MSG="${MSG}\n    ${SETTINGS_LINK}"
+		MSG="${MSG}\nbut should be linked to"
+		MSG="${MSG}\n    ${CORRECT_NAME}"
+		# TODO: Tell them how to fix it.
+		"${ALLSKY_SCRIPTS}/addMessage.sh" "error" "${MSG}"
+		echo "ERROR: Settings file (${SETTINGS_FILE}) incorrectly linked to ${SETTINGS_LINK}." >&2
+	fi
+fi
+
 # Make directories that need to exist.
 if [[ -d ${ALLSKY_TMP} ]]; then
 	# remove any lingering old image files.

html/documentation/changeLog.html

@@ -65,11 +65,19 @@ <h4>Enhancements</h4>
 						<span class="WebUISetting">Camera Type</span>.
 						For example, replacing a ZWO ASI120 with an ASI290.
 					</li>
-					<li>Speed up the installation process by using prebuilt binaries where possible.</li>
-					<li>The installation only prompts for a new hostname if the current one is the default,
-						"raspberrypi".  The suggested new name is still "allsky".
-						If the current hostname is anything other than "raspberrypi" it implies the
-						user has already changed the Pi's name, so don't prompt to change again.
+					<li>Greatly sped up the installation process when packages are not
+						already installed by using prebuilt binaries where possible.
+					</li>
+					<li>The installation only prompts for a new hostname if the current one
+						is still the default "raspberrypi".
+						The suggested new name is still "allsky".
+						If the current hostname is anything other than the default the user
+						already changed the Pi's name, so don't prompt to change again.
+					</li>
+					<li>Check at startup if the settings file is properly linked to a
+						camera-specific file.
+						When it isn't, changes to the settings won't be propogated during
+						updates to Allsky or when switching cameras.
 					</li>
 				</ul>
 

scripts/functions.sh

@@ -442,3 +442,101 @@ function settings()
 	echo "${ME2}: running as $(id --user --name), unable to get json value for '${1}';" >&2
 	ls -l "${SETTINGS_FILE}" >&2
 }
+
+
+#####
+# Return hard any link(s) to the specified file.
+# The links must be in the same directory.
+# On success return code 0 and the link(s).
+# On failure, return code 1 and an error message.
+NO_LINK_=3
+function get_links()
+{
+	local FILE="$1"
+	if [[ -z ${FILE} ]]; then
+		echo "get_links(): File not specified."
+		return 1
+	fi
+	local DIRNAME="$( dirname "${FILE}" )"
+
+	# shellcheck disable=SC2012
+	local INODE="$( ls -l --inode "${FILE}" 2>/dev/null | cut -f1 -d' ' )"
+	if [[ -z ${INODE} ]]; then
+		echo "File '${FILE}' not found."
+		return 2
+	fi
+
+	# Don't include the specified FILE.
+	LINKS="$(
+		if [[ ${DIRNAME} == "." ]]; then
+			x="./"
+		else
+			x=""
+		fi
+		find "${DIRNAME}" -inum "${INODE}" "!" -path "${x}${FILE}" | 
+			if [[ -n ${x} ]]; then
+				sed -e "s;^${x};;"
+			else
+				cat
+			fi
+	)"
+	if [[ -z ${LINKS} ]]; then
+		echo "No links for '${FILE}'."
+		return "${NO_LINK_}"
+	fi
+
+	echo "${LINKS}"
+	return 0
+}
+
+
+#####
+# Make sure the settings file is linked to the camera-specific file.
+# Return 0 code and no message if successful, else 1 and return a message.
+function check_settings_link()
+{
+	local FILE DIRNAME SETTINGS_LINK RET MSG F E CORRECT_NAME
+	FILE="$1"
+	if [[ -z ${FILE} ]]; then
+		echo "check_settings_link(): Settings file not specified."
+		return 1
+	fi
+
+	DIRNAME="$( dirname "${FILE}" )"
+	SETTINGS_LINK="$( get_links "${FILE}" )"
+	RET=$?
+	if [[ ${RET} -ne 0 ]]; then
+		MSG="The settings file (${SETTINGS_FILE}) is not linked to"
+		MSG="${MSG} a camera-specific file; any setting changes you make will not"
+		MSG="${MSG} be saved if you switch cameras or upgrade Allsky."
+		[[ ${RET} -ne "${NO_LINK_}" ]] && MSG="${MSG}\nERROR: ${SETTINGS_LINK}."
+		echo "${MSG}$( fix_settings_link )"
+		return 1
+	else
+		# Make sure it's linked to the correct file.
+		SETTINGS_LINK="$( basename "${SETTINGS_LINK}" )"
+		F="${FILE%.*}"
+		E="${FILE##*.}"
+		CORRECT_NAME="$( basename "${F}_${CAMERA_TYPE}_${CAMERA_MODEL}.${E}" )"
+		if [[ ${SETTINGS_LINK} != "${CORRECT_NAME}" ]]; then
+			MSG="The settings file (${SETTINGS_FILE}) is not properly linked to"
+			MSG="${MSG} its camera-specific file; any setting changes you make will not"
+			MSG="${MSG} be saved if you switch cameras or upgrade Allsky."
+			MSG="${MSG}\nIt is linked to:"
+			MSG="${MSG}\n    ${DIRNAME}/${SETTINGS_LINK}"
+			MSG="${MSG}\nbut should be linked to:"
+			MSG="${MSG}\n    ${DIRNAME}/${CORRECT_NAME}"
+			echo "${MSG}$( fix_settings_link )"
+			return 1
+		fi
+	fi
+
+	return 0
+}
+
+function fix_settings_link()
+{
+	# TODO: describe how to fix the settings link.
+	#### echo "\nTo fix: "
+	return 0
+}