Currently it's not possible to set `essential-services' when building
operating systems for containers, since `container-essential-services'
always uses the defaults.
It's possible to reference `essential-services' from the operating
system that's passed in, but since it's thunked, the operating system
needs to be defined in two passes to avoid an infinite loop.
* gnu/system/linux-container.scm (container-essential-services): Use
operating-system-essential-services instead of the defaults to allow
overriding the base services.
(containerized-operating-system): Update accordingly.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Change-Id: I81452487ef1ad01d3fa874c26d93a67d58ce6062
841fd4880a