tftp returns 0 bytes file when dtb request resulting in boot failure

[Shantur Rathore]

MAAS TFTP server is returning 0 byte successful response for non-existent files.

I am using MAAS for my RockPro64 cluster and u-boot fails to boot over network as when grubaa64.efi is loaded it requests for /dtb/rockchip/rk3399-rockpro64.dtb and in response a 0 byte successful response is received.
This is breaking working setups and no machines can be deployed anymore.

Maybe the change https://github.com/canonical/maas/commit/915882cfd7786a68d10a5cf461a29d7690912b80 needs to be to return 0 byte success for '*.lst' files requested by grub and rest all should be error as expected if the files aren't present.

[Shantur Rathore (rathore4u)]

Forgot to mention it is in MAAS 3.5

[Anton Troyanov (troyanov)]

Hi Shantur,

Thanks for the bug report.

May I ask you to try the following patch?
https://code.launchpad.net/~troyanov/maas/+git/maas/+merge/466767

If you are using snap, you can apply it using the following approach:
$ cd /tmp/
$ cp /snap/maas/current/lib/python3.10/site-packages/provisioningserver/rackdservices/tftp.py .
$ # apply patch
$ sudo mount -o bind,ro /tmp/tftp.py /snap/maas/current/lib/python3.10/site-packages/provisioningserver/rackdservices/tftp.py
$ sudo snap restart maas

[Shantur Rathore (rathore4u)]

Hi Anton,

Thanks for the patch,
I can confirm it works as expected and I am able to deploy machines now.