Comment 9 for bug 1734274

Gabor, the file ends up rendered (through MAAS's tempita) into yaml.
That yaml then needs to define a dictionary for 'early_commands'.

I can't provide an easy way to test MAAS's rendering of tempita.

But this shows the problem easily:

$ cat my.cfg
install:
 log_file: /tmp/out.log
stages: [early]
early_commands:
 # does not matter

$ curtin -vvv --showtrace install --config=my.cfg my.cfg | pastebinit
http://paste.ubuntu.com/26034970/