BananaPi BPI-M4-Zero: Add error handling

Check connection with curl before cloning wireless-regdb.
Check for the regulatory.db && regulatory.db.p7s files before
adding them the img.

Signed-off-by: Patrick Yavitz <pyavitz@gmail.com>

Author: pyavitz

config/boards/bananapim4zero.conf

@@ -25,12 +25,16 @@ function post_family_tweaks_bsp__bananapi_firmware() {
 }
 
 function post_family_tweaks_bsp__bananapi_wireless_regdb() {
-	mkdir -p $SRC/cache
-	mkdir -p "${destination}"/lib/firmware/updates
-	display_alert "$BOARD" "Installing upstream wireless-regdb" "info"
-	git clone --depth=1 -q git://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git $SRC/cache/wireless-regdb
-	sleep .25
-	cp -f $SRC/cache/wireless-regdb/regulatory.db "${destination}"/lib/firmware/updates/regulatory.db
-	cp -f $SRC/cache/wireless-regdb/regulatory.db.p7s "${destination}"/lib/firmware/updates/regulatory.db.p7s
-	rm -fdr $SRC/cache/wireless-regdb
+	if [[ `curl -I https://git.kernel.org 2>&1 | grep 'HTTP/2 200'` ]]; then
+		mkdir -p $SRC/cache
+		mkdir -p "${destination}"/lib/firmware/updates
+		display_alert "$BOARD" "Installing upstream wireless-regdb" "info"
+		git clone --depth=1 -q https://git.kernel.org/pub/scm/linux/kernel/git/sforshee/wireless-regdb.git $SRC/cache/wireless-regdb
+		sleep .25
+		if [[ -f "$SRC/cache/wireless-regdb/regulatory.db" ]] && [[ -f "$SRC/cache/wireless-regdb/regulatory.db.p7s" ]]; then
+			cp -f $SRC/cache/wireless-regdb/regulatory.db "${destination}"/lib/firmware/updates/regulatory.db
+			cp -f $SRC/cache/wireless-regdb/regulatory.db.p7s "${destination}"/lib/firmware/updates/regulatory.db.p7s
+		fi
+		rm -fdr $SRC/cache/wireless-regdb
+	fi
 }