Bug 207150

Summary: bsdinstall(8): ZFS install fails if zpool name equals to file/directory exists in root
Product: Base System Reporter: gabor.radnai
Component: binAssignee: Allan Jude <allanjude>
Status: New ---    
Severity: Affects Only Me CC: allanjude
Priority: --- Keywords: install
Version: CURRENT   
Hardware: Any   
OS: Any   

Description gabor.radnai 2016-02-13 11:41:50 UTC 
bsdinstall(8): ZFS install fails if one pick a name for root zpool which exists as file or directory in /.

To repeat:
1. start bsdinstall
2. Pick zroot name 'sys' for example
3. Eventually untar fails

Suggested resolution is trivial:
If new root zpool name is $zroot then mount zroot as /X$zroot, where X is for example 'root'.

By default bsdinstall creates similar ZFS structure:
NAME                 USED  AVAIL  REFER  MOUNTPOINT
zroot                408M  6.32G    96K  /zroot
zroot/ROOT           406M  6.32G    96K  none
zroot/ROOT/default   406M  6.32G   406M  /

Should be rather if zpool name is 'sys' for example:
NAME                 USED  AVAIL  REFER  MOUNTPOINT
sys                408M  6.32G    96K  /rootsys
sys/ROOT           406M  6.32G    96K  none
sys/ROOT/default   406M  6.32G   406M  /