If the root file system is composed from multiple devices, wait for
devices to be ready before running zpool and dumpon rc scripts.
An example of this is if the bulk of the root file system exists on a
fast device (e.g. NVMe) but the /var directory comes from a ZFS dataset
on a slower device (e.g. SATA). In this case, it is possible that the
zpool import may run before the slower device has finished being probed,
leaving the system in an intermediate state.
Fix is to add root_hold_wait to the zpool and dumpon (which has a
similar issue) rc scripts.
PR: 242189
Reported by: osidorkin@gmail.com
Reviewed by: allanjude
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D29101
The reasons for this are forward looking to pkgbase:
* /sbin/init is a special binary; try not to replace it with
every package update because an rc script was touched.
(a follow-up commit will make init its own package)
* having rc in its own place will allow more easy replacement
of the rc framework with alternatives, such as openrc.
Discussed with: brd (during BSDCam), kmoore
Requested by: cem, bz
PR: 231522
Approved by: re (gjb)
