Follow-up for aaa27e2e21
The commit described about system potentially becoming undebuggable
after switching into broken root or whatnot. But notably we can never
activate emergency.target after do_reexecute() failure, since the Manager
has been destructed. Plus, for a normal reexecution the fallback shell logic
triggered on non-existent /sbin/init is kinda useful. Let's hence guard
the extra check behind switch-root.
Also, move the check below /run/nextroot/ detection.
System and Service Manager
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