Add dockerfile? about picl-k3os-image-generator

[sgielen]

I'm not sure if we can, because we use root privileges to perform loopback mounts. I think a privileged container could perhaps work. Would you like to give it a go? I can provide support where necessary and will certainly merge a change where a working Dockerfile (with some instructions in the README) is added.

[Ognian]

Ok I tried this out and ended with the following:

...

2020-05-13 15:39:13 (5.54 MB/s) - 'deps/rpi-firmware-nonfree-master.zip' saved [110930819]

== Making image and filesystems... ==
/dev/mapper/control: open failed: No such device
Failure to communicate with kernel device-mapper driver.
Check that device-mapper is available in the kernel.
Incompatible libdevmapper 1.02.167 (2019-11-30) and kernel driver (unknown version).
device mapper prerequisites not met

If you want I can make a pull request with the work I did until now...

[Ognian]

I've added some debug output:

and the output

looks like parts -a /dev/loopX is failing...
any ideas on this?

[Ognian]

Maybe this can help...
I'm running privileged have devices /dev:/dev and cap_add: CAP_MKNOD

[Ognian]

it should work now...
added pull request #18

[Ognian]

@sgielen have you been able to review the PR already?

[sgielen]

Docker support landed in abd9ca3, thanks @Ognian!