installer.sh: fix crash if ARCHIVE_PATH is empty

Author: adil192

installer.sh

@@ -37,31 +37,34 @@ fi
 BIN_PATH="${HOME}/.local/bin"
 APP_PATH="${HOME}/.local/share/applications"
 SYS_PATH="${HOME}/.local/share/loffice-365"
-if [ -n "$1" ]; then
+if [ -f "$1" ]; then
 	ARCHIVE_PATH=$(readlink -f "$1")
 fi
-DEFAULT_ARCHIVE_PATH=$(readlink -f "binaries/loffice-365.tgz")
+if [ -f "binaries/loffice-365.tgz" ]; then
+	DEFAULT_ARCHIVE_PATH=$(readlink -f "binaries/loffice-365.tgz")
+fi
 
 # Download app
 rm -rf "${SYS_PATH}"
 mkdir -p "${HOME}/.local/share/"
 mkdir -p "${BIN_PATH}"
 mkdir -p "${APP_PATH}"
 cd "${HOME}/.local/share/"
-if [ -n "$1" ]; then
+if [ -n "${ARCHIVE_PATH}" ] && [ -f ${ARCHIVE_PATH} ]; then
 	# Use specified local loffice-365.tgz
-	echo "Using ${ARCHIVE_PATH}"
+	echo "Using specified archive at ${ARCHIVE_PATH}"
 	mkdir loffice-365
 	tar xfz ${ARCHIVE_PATH} -C loffice-365 --strip-components=1
-elif [ -f ${DEFAULT_ARCHIVE_PATH} ]; then
+elif [ -n "${DEFAULT_ARCHIVE_PATH}" ] && [ -f ${DEFAULT_ARCHIVE_PATH} ]; then
 	# Use default location of built loffice-365.tgz
-	echo "Using ${DEFAULT_ARCHIVE_PATH}"
+	echo "Using archive at ${DEFAULT_ARCHIVE_PATH}"
 	mkdir loffice-365
 	tar xfz ${DEFAULT_ARCHIVE_PATH} -C loffice-365 --strip-components=1
 else
 	# Download latest release from adil192/loffice-365
-	echo "Downloading latest release from adil192/loffice-365"
+	echo "Using latest release from adil192/loffice-365"
 	ARCHIVE=$(curl https://api.github.com/repos/adil192/loffice-365/releases |grep browser_download_url |head -n1 |sed 's/"browser_download_url": "//g;s/"//g;s/ //g')
+	echo "Downloading ${ARCHIVE}"
 	curl -L "${ARCHIVE}" --output loffice-365.tgz
 	tar xfz loffice-365.tgz
 	rm -f loffice-365.tgz