fff-sysupgrade: replace comma by underscore in image file names

On modern targets in OpenWrt, the board name follows the
"vendor,model" syntax. Since commas in file names are uncommon
and ugly, file names use the same pattern with an underscore,
"vendor_model".

Since this also applies to image file names, this patch
adjusts fff-upgrade.sh to replace the comma from board name
by an underscore for all devices. This should be possible
without harm as OpenWrt images can safely be expected to
either contain a comma in the right place or no comma at all.

It has been discussed whether the same should be applied to
the network.* files as well. However, expecting those to
be removed in the foreseeable future does make this undesirable,
as a lot of code would be inserted now and be removed again a few
months later, only to fix the name for one device.

For the same reason, we won't touch the board name replace
for the TL-WDR4900 v1 for now.

Suggested-by: Fabian Bläse <fabian@blaese.de>
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>

src/packages/fff/fff-sysupgrade/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=fff-sysupgrade
-PKG_RELEASE:=11
+PKG_RELEASE:=12
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 

src/packages/fff/fff-sysupgrade/files/sbin/fff-upgrade.sh

@@ -12,7 +12,7 @@ if [ -z "$UPGRADE_PATH" ]; then
   exit 1
 fi
 
-BOARD=$(uci get board.model.name)
+BOARD=$(uci get board.model.name | sed 's/,/_/')
 
 echo "Hardware: $BOARD"