[Bug 207377] [10.3-BETA2] freebsd-update relying on kern.bootfile copies around entire filesystem

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207377

            Bug ID: 207377
           Summary: [10.3-BETA2] freebsd-update relying on kern.bootfile
                    copies around entire filesystem
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: h2+fbsdports at fsfe.org

I am just updating to 10.3-BETA2 with freebsd-update and it starting copying my
entire filesystem into /boot/kernel.old/
After some debugging I found out that this is due to a mechanism where it
detects the kernel dir from kern.bootfile. Since I have a slightly more
sophisticated setup where I use grub, this variable ends up being /kernel
=> freebsd-update assumes that / is the kerneldir and copies *everything* into
the backup dir as mentioned above.

I think this is bad behaviour, a smart thing would be to check if the directory
pointed to by kern.bootfile actually contains a kernel file, and if not ask the
user to specify the directory or skip the backup process entirely. Most users
rely on snapshots nowadays so this step is not really crucial.

And / should never be accepted as KERNELDIR IMHO.

Thank you!

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