[Kobo] Unbreak Wi-Fi on FW >= 4.23 (#6522)

* Unbreak Wi-Fi on Kobo w/ FX >= 4.23+

Stop relying on WIFI_MODULE_PATH, it's no longer exported by the init
script.

Fix #6500

* Resync the nickel restart script w/ upstream

Let udev handle the SD card, and actually allow nickel to see those events by re-creating the FIFO ourselves, to avoid races.

platform/kobo/enable-wifi.sh

@@ -4,8 +4,8 @@
 lsmod | grep -q sdio_wifi_pwr || insmod "/drivers/${PLATFORM}/wifi/sdio_wifi_pwr.ko"
 # Moar sleep!
 usleep 250000
-# WIFI_MODULE_PATH = /drivers/$PLATFORM/wifi/$WIFI_MODULE.ko
-lsmod | grep -q "${WIFI_MODULE}" || insmod "${WIFI_MODULE_PATH}"
+# NOTE: Used to be exported in WIFI_MODULE_PATH before FW 4.23
+lsmod | grep -q "${WIFI_MODULE}" || insmod "/drivers/${PLATFORM}/wifi/${WIFI_MODULE}.ko"
 # Race-y as hell, don't try to optimize this!
 sleep 1
 

platform/kobo/koreader.sh

@@ -101,9 +101,9 @@ if [ "${VIA_NICKEL}" = "true" ]; then
     if [ "${FROM_NICKEL}" = "false" ]; then
         # Siphon a few things from nickel's env (namely, stuff exported by rcS *after* on-animator.sh has been launched)...
         # shellcheck disable=SC2046
-        export $(grep -s -E -e '^(DBUS_SESSION_BUS_ADDRESS|NICKEL_HOME|WIFI_MODULE|LANG|WIFI_MODULE_PATH|INTERFACE)=' "/proc/$(pidof -s nickel)/environ")
+        export $(grep -s -E -e '^(DBUS_SESSION_BUS_ADDRESS|NICKEL_HOME|WIFI_MODULE|LANG|INTERFACE)=' "/proc/$(pidof -s nickel)/environ")
         # NOTE: Quoted variant, w/ the busybox RS quirk (c.f., https://unix.stackexchange.com/a/125146):
-        #eval "$(awk -v 'RS="\0"' '/^(DBUS_SESSION_BUS_ADDRESS|NICKEL_HOME|WIFI_MODULE|LANG|WIFI_MODULE_PATH|INTERFACE)=/{gsub("\047", "\047\\\047\047"); print "export \047" $0 "\047"}' "/proc/$(pidof -s nickel)/environ")"
+        #eval "$(awk -v 'RS="\0"' '/^(DBUS_SESSION_BUS_ADDRESS|NICKEL_HOME|WIFI_MODULE|LANG|INTERFACE)=/{gsub("\047", "\047\\\047\047"); print "export \047" $0 "\047"}' "/proc/$(pidof -s nickel)/environ")"
     fi
 
     # Flush disks, might help avoid trashing nickel's DB...
@@ -173,7 +173,6 @@ if [ -z "${INTERFACE}" ]; then
     INTERFACE="eth0"
     export INTERFACE
 fi
-# end of value check of PLATFORM
 
 # We'll want to ensure Portrait rotation to allow us to use faster blitting codepaths @ 8bpp,
 # so remember the current one before fbdepth does its thing.

platform/kobo/nickel.sh

@@ -66,19 +66,20 @@ if lsmod | grep -q sdio_wifi_pwr; then
     rmmod sdio_wifi_pwr
 fi
 
+# Recreate Nickel's FIFO ourselves, otherwise, udev may attempt to write to it before Nickel creates it,
+# and Nickel doesn't handle that well (i.e., it doesn't unlink first, the FIFO isn't created, it's now a regular file, hilarity ensues).
+# Plus, we actually *do* want the stuff udev writes in there to be processed by Nickel, anyway.
+rm -f "/tmp/nickel-hardware-status"
+mkfifo "/tmp/nickel-hardware-status"
+
 # Flush buffers to disk, who knows.
 sync
 
 # And finally, simply restart nickel.
 # We don't care about horribly legacy stuff, because if people switch between nickel and KOReader in the first place, I assume they're using a decently recent enough FW version.
-# Last tested on an H2O & a Forma running FW 4.7.x - 4.12.x
+# Last tested on an H2O & a Forma running FW 4.7.x - 4.23.x
 /usr/local/Kobo/hindenburg &
 LIBC_FATAL_STDERR_=1 /usr/local/Kobo/nickel -platform kobo -skipFontLoad &
-udevadm trigger &
-
-# Handle sdcard
-if [ -e "/dev/mmcblk1p1" ]; then
-    echo sd add /dev/mmcblk1p1 >>/tmp/nickel-hardware-status &
-fi
+[ "${PLATFORM}" != "freescale" ] && udevadm trigger &
 
 return 0