aaa27e2e21
If we switch root and can't execute an init program afterwards, we're completely stuck as we can't go back to the initramfs to start emergency.service as it will have been completely removed by the switch root operation. To prevent leaving users with a completely undebuggable system, let's at least check before we switch root whether at least one of the init programs we might want to execute actually exist, and fail early if none of them exists.
System and Service Manager
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