pjones and I happened to notice this suspicious line in the
lmc log for a Fedora 27 live image compose:
2017-08-25 16:04:55,327 DEBUG pylorax.ltmpl: template line 25: installimg None usr/share/lorax//product/ images/product.img
That 'None' does not look right. I believe this is the problem.
The command is defined as `installimg ${compressargs} ...`, and
a few lines earlier, `compressargs` is initially assigned (in
Python) as `None`. `None`, in Python, stringifies to the string
'None'. So unless we're on i386 (where `compressargs` gets
defined to an actual string of arguments in a conditional), we
wind up passing in the string 'None' as the first arg to the
`installimg` command.
To fix this, `compressargs` should be initially set to the empty
string rather than `None`.
5ace9bdec4