[root@Sailfish nemo]# cat /lib/udev/rules.d/998-droid-system.rules
SUBSYSTEM=="graphics", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="block", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="oncrpc", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="adsp", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="msm_camera", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="mtd", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="block", SYMLINK+="$env{SUBSYSTEM}/%k"
SUBSYSTEM=="misc", KERNEL=="log_events", SYMLINK+="alog/events"
SUBSYSTEM=="misc", KERNEL=="log_radio", SYMLINK+="alog/radio"
SUBSYSTEM=="misc", KERNEL=="log_system", SYMLINK+="alog/system"
SUBSYSTEM=="misc", KERNEL=="log_main", SYMLINK+="alog/main"

# Partition symlinks, compatible with the android way of setting up the
# symlinks.

# Pass collected (see below) information down to lower levels.
SUBSYSTEM=="?*", ENV{PLATFORM_FOLDER}=="", IMPORT{parent}="PLATFORM_FOLDER"
SUBSYSTEM=="?*", ENV{PLATFORM_DEVICE}=="", IMPORT{parent}="PLATFORM_DEVICE"
# Collect information about the platform devices:
# /sys/devices/platform/FOLDER
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*", DEVPATH=="/devices/platform/*", ENV{PLATFORM_FOLDER}="$kernel"
# /sys/devices/platform/FOLDER/DEVICE
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*/*", DEVPATH=="/devices/platform/*/*", ENV{PLATFORM_DEVICE}="$kernel"
# /sys/devices/FOLDER
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*", DEVPATH=="/devices/*", ENV{PLATFORM_FOLDER}="$kernel"
# /sys/devices/FOLDER/DEVICE
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*/*", DEVPATH=="/devices/*/*", ENV{PLATFORM_DEVICE}="$kernel"

# This will set up the bootdevice symlink, given that androidboot.bootdevice
# is set on the commandline. If it is not given on the cmdline, android-init
# will create the bootdevice (if the paths are correct, which they now should
# be). If android-init doesn't create the bootdevice symlink and there is no
# androidboot.bootdevice on the cmdline, then the bootdevice symlink is not
# required.
IMPORT{cmdline}="bootdevice"
# Unfortunately we cannot compare two variables, therefore use a workaround
# with a file.
ENV{bootdevice}!="", RUN+="/bin/touch /tmp/udev-$env{bootdevice}"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*/*", DEVPATH=="/devices/platform/*/*", TEST=="/tmp/udev-$env{PLATFORM_DEVICE}", RUN+="/bin/mkdir -p /dev/block/platform/$env{PLATFORM_FOLDER}/$env{bootdevice}"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*/*", DEVPATH=="/devices/platform/*/*", TEST=="/tmp/udev-$env{PLATFORM_DEVICE}", RUN+="/bin/ln -s /dev/block/platform/$env{PLATFORM_FOLDER}/$env{bootdevice} /dev/block/bootdevice"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*/*", DEVPATH=="/devices/*/*", TEST=="/tmp/udev-$env{PLATFORM_DEVICE}", RUN+="/bin/mkdir -p /dev/block/platform/$env{PLATFORM_FOLDER}/$env{bootdevice}"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*/*", DEVPATH=="/devices/*/*", TEST=="/tmp/udev-$env{PLATFORM_DEVICE}", RUN+="/bin/ln -s /dev/block/platform/$env{PLATFORM_FOLDER}/$env{bootdevice} /dev/block/bootdevice"
# On certain devices the path is .../$PLATFORM_FOLDER/$PLATFORM_DEVICE/...,
# but on others there is no $PLATFORM_DEVICE subdirectory, or in other words,
# PLATFORM_FOLDER=platform device, PLATFORM_DEVICE=empty string. (1).
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*", DEVPATH=="/devices/platform/*", TEST=="/tmp/udev-$env{PLATFORM_FOLDER}", RUN+="/bin/mkdir -p /dev/block/platform/$env{bootdevice}"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH=="/devices/platform/*", DEVPATH!="/devices/platform/*/*", DEVPATH=="/devices/platform/*", TEST=="/tmp/udev-$env{PLATFORM_FOLDER}", RUN+="/bin/ln -s /dev/block/platform/$env{bootdevice} /dev/block/bootdevice"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*", DEVPATH=="/devices/*", TEST=="/tmp/udev-$env{PLATFORM_FOLDER}", RUN+="/bin/mkdir -p /dev/block/platform/$env{bootdevice}"
SUBSYSTEM=="platform", KERNEL!="", DEVPATH!="/devices/platform/*", DEVPATH!="/devices/*/*", DEVPATH=="/devices/*", TEST=="/tmp/udev-$env{PLATFORM_FOLDER}", RUN+="/bin/ln -s /dev/block/platform/$env{bootdevice} /dev/block/bootdevice"

# Create the partition symlinks.
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="block/platform/$env{PLATFORM_FOLDER}/$env{PLATFORM_DEVICE}/by-name/$env{ID_PART_ENTRY_NAME}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="block/platform/$env{PLATFORM_FOLDER}/$env{PLATFORM_DEVICE}/by-num/p$env{ID_PART_ENTRY_NUMBER}"
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="block/platform/$env{PLATFORM_FOLDER}/$env{PLATFORM_DEVICE}/$name"

# Backwards compatibility for old SailfishOS approach (might not be necessary)
# NOTE: if the comment marked with (1) applies then this will not do anything.
ENV{ID_PART_ENTRY_SCHEME}=="gpt", ENV{ID_PART_ENTRY_NAME}=="?*", SYMLINK+="block/platform/$env{PLATFORM_FOLDER}/by-name/$env{ID_PART_ENTRY_NAME}"