Add --url option to download/extract adguard archive

github/check.adguard.update

@@ -49,6 +49,9 @@ EXAMPLE :
     - Specify the path to AdGuardHome binary
         check.adguard.update --bin /home/adguard/AdGuardHome/AdGuardHome
 
+    - Download ARMv7 version if it's a newer version
+        check.adguard.update --url "https://static.adguard.com/adguardhome/release/AdGuardHome_linux_armv7.tar.gz"
+
 OPTIONS :
     -b,--bin
         Specify the path of AdGuard Home's binary
@@ -58,6 +61,11 @@ OPTIONS :
         Set the path to the temp file that will be create and
         that should be monitored (default: ${ADGUARD_NEW_VERSION_FILE_DEFAULT}).
 
+    -u,--url
+        Set the URL to use to download the last version of AdGuard Home (default: empty).
+        See the list of possible URLs on :
+        https://github.com/AdguardTeam/AdGuardHome/wiki/Getting-Started
+
     -d,--debug
         Enable debug messages.
 
@@ -116,6 +124,23 @@ Test var: ${1}."
 
 }
 # }}}
+is_var_nonempty() {                                             # {{{
+
+	local_var_nonempty="${1}"
+
+	## Return False by default
+	return_var_nonempty="1"
+
+	debug_message "is_var_nonempty − \
+Test var: ${1}."
+	### Test if var lenght is nonzero and set return value to True
+	[ -n "${local_var_nonempty}" ] && return_var_nonempty="0"
+
+	unset local_var_nonempty
+
+	return "${return_var_nonempty}"
+}
+# }}}
 define_vars() {                                                 # {{{
 
 	## If adguard_bin wasn't defined (argument,...) {{{
@@ -146,26 +171,41 @@ main() {                                                        # {{{
 	## Define all vars according to selected options
 	define_vars
 
-	## Test adguard_current_version
+	## Test adguard_current_version {{{
 	##   AND exit with error 2
 	is_var_empty "${adguard_current_version}" \
 		&& error_message "adguard_current_version seems empty (${adguard_current_version})." 2
+	## }}}
 
-	## Test adguard_new_version
+	## Test adguard_new_version {{{
 	##   AND exit with error 3
 	is_var_empty "${adguard_new_version}" \
 		&& error_message "adguard_new_version seems empty (${adguard_new_version}), exit without error." 3
+	## }}}
 
 	## Check if the current version is the last one {{{
 	if [ "${adguard_current_version}" != "${adguard_new_version}" ]; then
 		debug_message "Test AdGuard Home version − \
 Current version (${adguard_current_version}) and new one (${adguard_new_version}) seems to be different."
 
-		## Create a temp file to monitor
+		## Create a temp file to monitor {{{
 		debug_message "Test AdGuard Home version − \
 Create ${adguard_new_version_file} temp file to monitore."
 		touch -- "${adguard_new_version_file}"
 		printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for AdGuard Home (current : ${adguard_current_version}) : ${adguard_new_version}." >> "${adguard_new_version_file}"
+		## }}}
+
+		## If an URL was set {{{
+		if is_var_nonempty "${adguard_new_version_url}"; then
+			debug_message "Download AdGuard Home new version − \
+Download new archive from ${adguard_new_version_url} and extract to /tmp/ ."
+			#wget --quiet "${adguard_new_version_url}" -O - | tar xz --transform="s/AdGuardHome/AdGuardHome.to.upgrade/g" --strip-components 2
+			wget --quiet "${adguard_new_version_url}" -O - | tar --extract --gzip --directory=/tmp --strip-components 2 ./AdGuardHome
+			#mv AdGuardHome.to.upgrade "${adguard_bin}.to.upgrade"
+			mv --force /tmp/AdGuardHome "${adguard_bin}.to.upgrade" \
+				|| error_message "Can't move /tmp/AdGuardHome to ${adguard_bin}.to.upgrade ."  4
+		fi
+		## }}}
 
 	else
 		debug_message "Test AdGuard Home version − \
@@ -215,6 +255,12 @@ if [ ! "${NBARGS}" -eq "0" ]; then
 			## Define adguard_new_version_file
 			adguard_new_version_file="${1}"
 			;;
+		-u|--url )             ## Set new version URL
+			## Move to the next argument
+			shift
+			## Define adguard_new_version_url
+			adguard_new_version_url="${1}"
+			;;
 		-- )                   ## End of options list
 			## End the while loop
 			break