batalert: Fails to start because BAT0 is assumed

[utkarsh2102]

From debbug #988091:

I get this error when running batalert:

$ batalert
Traceback (most recent call last):
        5: from /usr/bin/batalert:23:in `<main>'
       4: from /usr/bin/batalert:23:in `load'
       3: from /usr/share/rubygems-integration/all/gems/batalert-0.4.0/exe/batalert:5:in `<top (required)>'
       2: from /usr/share/rubygems-integration/all/gems/batalert-0.4.0/lib/batalert.rb:14:in `main'
       1: from /usr/share/rubygems-integration/all/gems/batalert-0.4.0/lib/batalert.rb:14:in `open'/usr/share/rubygems-
integration/all/gems/batalert-0.4.0/lib/batalert.rb:14:in `initialize': No such file or directory @ rb_sysopen -
/sys/class/power_supply/BAT0/capacity (Errno::ENOENT)

This appears to be caused by batalert making an incorrect assumption
about the battery name:

$ ls /sys/class/power_supply/
ACAD  BAT1

...which is true! See here:

batalert/lib/batalert.rb

Lines 14 to 18 in 703e816

	capacity = File.open('/sys/class/power_supply/BAT0/capacity', &:readline)
	capacity = capacity.to_i
	status = File.open('/sys/class/power_supply/BAT0/status', &:readline)
	status = status.chomp

Probably worth figuring out which BAT* is there separately? Maybe I'll go ahead and re-write this in a much better way.

[utkarsh2102]

Hm, looks like this could work:

# utkarsh @ utkarsh2102 in ~ [1:54:20] 
$ irb
irb(main):001:0> require "find"
=> true
irb(main):002:0> Find.find('/sys/class/power_supply/').grep(/BAT/)
=> ["/sys/class/power_supply/BAT0"]

[henrythemouse]

Likely you never had this in mind. I'd like to use this on an linux phone. There isn't any BAT* under power_supply. On the pine phone pro there are three directories there:

rk818-battery (with 4 more dirs under that and other subdirs under those with more files under each)
rk818-usb (similar dir sub-structure as above)
tcpm-source-psy-4-002 (similar dir sub-structure as above)

The phone is running Mobian, which is debian bookworm with a custom gnome shell. The phone does display notifications and I've written scripts using notify-send that work fine.

[rajudev]

Faced the same issue on my machine after installing from the latest commit.

[utkarsh2102]

Okay, I am going to use upower to fix this on the laptop/machine side. I still need to look at the pine phone thingy separately.

[Animesh-Ghosh]

@utkarsh2102 might I suggest k-nowicki/rupower as the Ruby interface for upower?