[Bug 251121] rc.d/zfsbe can't properly mount child datasets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251121

            Bug ID: 251121
           Summary: rc.d/zfsbe can't properly mount child datasets
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: kpneal at pobox.com

Created attachment 219663
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219663&action=edit
Corrected version of the script.

The /etc/rc.d/zfsbe script confuses ZFS dataset names with filesystem paths. As
a result it doesn't recognize datasets that are children of the dataset that is
mounted at "/". Instead it mounts them at the location they would be at if a
different boot environment was used.

This is the broken set of mounts (with other, not relevant mounts omitted):

Filesystem                                  Size    Used   Avail Capacity 
Mounted on
gs1p/ROOT/FreeBSD_12.2-RELEASE              459G    391M    459G     0%    /
gs1p/ROOT/FreeBSD_12.2-RELEASE/usr          464G    5.5G    459G     1%   
/ROOT/FreeBSD_12.2-RELEASE/usr
gs1p/ROOT/FreeBSD_12.2-RELEASE/usr/local    466G    7.8G    459G     2%   
/ROOT/FreeBSD_12.2-RELEASE/usr/local
gs1p/ROOT/FreeBSD_12.2-RELEASE/usr/src      460G    1.2G    459G     0%   
/ROOT/FreeBSD_12.2-RELEASE/usr/src

The result is a trip to the datacenter to fix the now broken upgrade.

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