[systemd-devel] minimal required units

[Aaron_Wright at selinc.com]

I'm trying to make an embedded device, and I would like to start with the 
minimal setup as possible. Are there some units that are required by 
systemd?
I ask because systemd is complaining about a missing rescue.target unit, 
but I don't list rescue.target as a dependency of any other unit.
However, grep tells me that /usr/lib/systemd/systemd contains the 
"rescue.target" string, which worries me. Is there a list of all the units 
that are required, even though no other unit lists them?
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