From: Klemens Nanni <kn@openbsd.org>
Subject: Re: sysupgrade vs NFS
To: Miod Vallat <miod@online.fr>
Cc: tech@openbsd.org
Date: Sat, 14 Jun 2025 18:28:24 +0000

14.06.2025 19:24, Miod Vallat пишет:
> NFS mounts are not available during upgrade, therefore if you
> don't use the -b option to select something different than
> /home/_sysupgrade and /home is mounted on NFS, the upgrade fails.
 
Aha, here the installer skips NFS completely wrt. DNS concerns.

Two experiments for more insights:

	100.64.73.1:/vm /home nfs rw,nodev,nosuid,soft,intr 0 0

@@ -2712,7 +2715,6 @@ munge_fstab() {
 	while read _dev _mp _fstype _opt _rest; do
 		# Drop irrelevant lines and filesystems.
 		[[ $_dev == @(/dev/vnd*|\#*) ||
-			$_fstype == nfs ||
 			! -f /sbin/mount_$_fstype ||
 			$_opt == *noauto* ||
 			$_opt == *xx* ]] && continue

The function does "mount non-ffs filesystems read only":

Installing base77.tgz     8% |**                        | 43520 KB    00:42 ETA
tar: Unable to set file uid/gid of ./home: Read-only file system
tar: Could not set permissions on ./home: Read-only file system
tar: Could not set permissions on ./home: Read-only file system
Installing base77.tgz   100% |**************************|   496 MB    00:39    
tar: Access/modification time set failed on: /mnt/home: Read-only file system
Installation of base77.tgz failed. Continue anyway? [no] no
^C

If it weren't for the chmod'ing the directory itself, it'd work
(at least without DNS);  adding "continue anyway" and "are you *sure*"
to /auto_upgrade.conf and restarting (A)utoinstall makes it through.



From there, I tried these answers interjected between sysupgrade and reboot:

	Location of sets = nfs
	Server IP address or hostname = 100.64.73.1
	Filesystem on server to mount = /vm
	Pathname to the sets = /_sysupgrade
	Directory does not contain SHA256.sig. Continue without verification = yes

That did the trick even with read-write mounting the sets dir:

Location of sets? (disk http nfs or 'done') [http] nfs
Server IP address or hostname? 100.64.73.1
Filesystem on server to mount? /vm
Use TCP transport? (requires TCP-capable NFS server) [no] no
NFS Portmap: RPC: Port mapper failure - RPC: Unable to send
Pathname to the sets? (or 'done') [7.7/amd64] /_sysupgrade

Select sets by entering a set name, a file name pattern or 'all'. De-select
sets by prepending a '-', e.g.: '-game*'. Selected sets are labelled '[X]'.
    [X] bsd           [X] comp77.tgz    [X] xbase77.tgz   [X] xserv77.tgz
    [X] bsd.rd        [X] man77.tgz     [X] xshare77.tgz
    [X] base77.tgz    [X] game77.tgz    [X] xfont77.tgz
Set name(s)? (or 'abort' or 'done') [done] done
Directory does not contain SHA256.sig. Continue without verification? [no] yes
Installing bsd          100% |**************************| 31312 KB    00:01    
Installing bsd.rd       100% |**************************|  4685 KB    00:00    
Installing base77.tgz   100% |**************************|   496 MB    00:37    
Installing comp77.tgz   100% |**************************| 87512 KB    00:15    
Installing man77.tgz    100% |**************************|  8272 KB    00:04    
Installing game77.tgz   100% |**************************|  2752 KB    00:00    
Installing xbase77.tgz  100% |**************************| 72981 KB    00:07    
Installing xshare77.tgz 100% |**************************|  4556 KB    00:06    
Installing xfont77.tgz  100% |**************************| 23021 KB    00:04    
Installing xserv77.tgz  100% |**************************| 11775 KB    00:01    
Installing BUILDINFO    100% |**************************|    54       00:00    
Location of sets? (disk http nfs or 'done') [done] done
Making all device nodes... done.
fw_update: add none; update none; keep intel
Relinking to create unique kernel...uid 0 on /mnt/usr: file system full


(3G vm.img was to small, hence relink failure, but that's unrelated.)


Mark, perhaps you want to improve munge_fstab() to allow NFS in certain
situations?  Or have sysupgrade produce respective answers when the dir
is on NFS?  Or just roll with a custom file?

Hope this helps.