Koreader crashes if Kobo eReader.conf is missing

[bitfreak]

* My environment is completely custom
* It does not have nickel
* It does not have the file /mnt/onboard/.kobo/Kobo/Kobo eReader.conf

After starting KOReader, it drops back to the shell with the following error:

./luajit: frontend/device/kobo/nickel_conf.lua:155: /mnt/onboard/.kobo/Kobo/Kobo eReader.conf: No such file or directory

Spoiler:

stack traceback:
[C]: in function 'assert'
frontend/device/kobo/nickel_conf.lua:155: in function 'set'
frontend/device/kobo/nickel_conf.lua:68: in function 'get'
frontend/device/kobo/powerd.lua:38: in function '_syncKoboLightOnStart'
frontend/device/kobo/powerd.lua:173: in function 'init'
frontend/device/generic/powerd.lua:28: in function 'new'
frontend/device/kobo/device.lua:774: in function 'init'
frontend/device.lua:62: in main chunk
[C]: in function 'require'
reader.lua:151: in main chunk
[C]: at 0x000140cd

Creating the file solves the problem, however I figured this might also affect regular users.
Some sort of disk or file corruption could cause the same issue and would prevent them from starting their favorite app.

[bitfreak]

Right, that figures..its used to identify a KOBO device. I keep forgetting that you guys support hundreds of devices.

However for my situation it was a problem and I figured that the boot loader space was identical for at least bunch of KOBO's (maybe all of them). So instead of testing for /bin/kobo_config.sh I tested on the presence of the hardware configuration hwcfg= in /proc/cmdline.

    local handle = io.popen("grep -o hwcfg= /proc/cmdline")
    local kobo_test_stat = handle:read("*line")
    handle:close()

--    local kobo_test_stat = lfs.attributes("/bin/kobo_config.sh")
    if kobo_test_stat then
        util.noSDL()
        return require("device/kobo/device")
    end

[pazos]

They are actually two different things.

Kobo eReader.conf is used by nickel to store frontlight values
kobo_config.sh is used by the device probe.

Those files work, even if empty. "touch" them once and leave the program as is (and enjoy updates)