[LEDE-DEV] Adding a extroot-ready firmware image to download repositories

[Alberto Bursi]

I'm currently editing the wiki to add stuff, I'm on the extroot page.

The extroot tutorial is 100% easy to follow also for newbies, the big 
issue is that for devices with 4 MiB storage space you can't install the 
packages needed and there is no pre-made image with the tools to do it.

So they need to have a linux system or make a VM to install the image 
generator, and learn how to use it to generate a extroot-friendly image.
(not that it is hard, but for most people it's much more time lost to 
get the device set up)

Also, having additional firmware images with the tools inside already 
would be cool for everyone.

Would it be possible to tell the buildbots to make a variant of the 
flashable images for extroot use for all eligible devices (storage < 4 
MiB and usb/sata/sdcard)?

For the sake of clarity, these are the packages needed by one of such 
devices to be able to extroot (I think most devices have the 
usb/sata/sdcard packages pre-selected in their own profile, so that 
should not be required).

blkid block-mount kmod-fs-ext4

-Alberto