bootctrl: fall back to active slot if current slot not found in cmdline

[a-wai]

While postmarketOS makes use of a kernel cmdline argument, this isn't the case for all distros. Furthermore, this argument isn't present in those added automatically by the Android bootloader.

In order to still be able to use qbootctl on other distros, this change ensures we use the currently active slot as the current slot when the cmdline argument is missing. This ensure qbootctl -m picks up the correct slot more often than not, instead of always defaulting to _a.

[kcxt]

Sorry i totally missed this PR!

Not sure how motivated you are still with this, the diff needs fixing (is it necessary to move the function?) and I think it would make sense to adjust the function name to reflect the fallback behaviour.

I can also make these changes while merging given the timespan...

[a-wai]

is it necessary to move the function?

Well it has to know about get_active_boot_slot(), defined on L541. The alternative being a forward declaration of the latter, I'm fine with either solution.

and I think it would make sense to adjust the function name to reflect the fallback behaviour.

Sure, do you have something specific in mind? get_current_or_active_slot? get_current_from_cmdline_or_active?

[kcxt]

OK I'm not sure what the heck I did here, github just wouldn't let me push to the PR. I adjusted this slightly and pushed it to main in 413ee35

[rmuxnet]

OK I'm not sure what the heck I did here, github just wouldn't let me push to the PR. I adjusted this slightly and pushed it to main in 413ee35

Btw is this supposed to technically fix the soft bricking issue if using any other distro apart pmos as in pmos it works fine as in arch ir corrupts lun and gpt tables.