make rootfs read-only

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

Recovery/board/funkey/rootfs-overlay/etc/u-boot.env

@@ -1,8 +1,8 @@
-args_mmc=setenv bootargs console=ttyS0,115200 panic=5 rootwait fbcon=map:10 fbcon=font:VGA8x8 vt.global_cursor_default=0 root=/dev/mmcblk0p${bootpart} rootfstype=ext4 rootflags=commit=120,data=writeback,barrier=0,journal_async_commit ${rw} quiet
+args_mmc=setenv bootargs console=ttyS0,115200 panic=5 rootwait fbcon=map:10 fbcon=font:VGA8x8 vt.global_cursor_default=0 root=/dev/mmcblk0p${bootpart} rootfstype=ext4 rootflags=commit=120,data=writeback,barrier=0,journal_async_commit ro quiet
 baudrate=115200
 bootcmd=run getbootpart; run check_keys; if test ${found} = 1; then setenv bootpart 1; fi; run args_mmc; run loadfdt; run loadimage; bootz ${loadaddr} - ${fdtaddr}
 bootdelay=0
-check_keys=run set_pullups; setenv found 0; setenv timeout ${delay}; while test ${timeout} > 0; do run read_keys; if test ${keys} = f83f; then setenv found 1; setenv timeout 0; setenv rw ro; else setexpr timeout ${timeout} - 1; fi; done
+check_keys=run set_pullups; setenv found 0; setenv timeout ${delay}; while test ${timeout} > 0; do run read_keys; if test ${keys} = f83f; then setenv found 1; setenv timeout 0; else setexpr timeout ${timeout} - 1; fi; done
 console=ttyS0,115200
 delay=1
 fdt_high=0xffffffff
@@ -12,7 +12,6 @@ loadaddr=0x41000000
 loadfdt=load mmc 0:${bootpart} ${fdtaddr} /boot/sun8i-v3s-funkey.dtb
 loadimage=load mmc 0:${bootpart} ${loadaddr} /boot/zImage
 read_keys=i2c read 20 0 2 1c20500; setexpr.w keys *1c20500
-rw=rw
 set_pullups=i2c mw 20 46 df; i2c mw 20 47 f8
 stderr=serial@01c28000
 stdin=serial@01c28000

Recovery/board/funkey/rootfs-overlay/usr/local/sbin/brightness_get

@@ -11,13 +11,17 @@ fi
 
 # Sanity check: File does not exist
 if [ ! -f ${BRIGHTNESS_FILE} ]; then
+    rw
     echo ${BRIGHTNESS_DEFAULT_VALUE} > ${BRIGHTNESS_FILE}
+    ro
 fi
 
 # Sanity check: Check if integer
 brightness=$(cat ${BRIGHTNESS_FILE})
 if ! [ ! "${brightness}" -ne "${brightness}" ] 2> /dev/null; then
+    rw
     echo ${BRIGHTNESS_DEFAULT_VALUE} > ${BRIGHTNESS_FILE}
+    ro
     brightness=${BRIGHTNESS_DEFAULT_VALUE}
 fi
 echo ${brightness}

Recovery/board/funkey/rootfs-overlay/usr/local/sbin/brightness_set

@@ -23,6 +23,8 @@ echo ${value} > ${SYSTEM_BRIGHTNESS}
 
 # Set new brightness value in brightness file
 if [ ${?} -eq 0 ]; then
+    rw
     echo ${brightness_percentage} > ${BRIGHTNESS_FILE}
+    ro
 fi
 exit 0