nfsmount built its mount options for GNU/Linux syntax unconditionally:
"-o port=N", "-o mountport=N" and "-o tcp". OpenBSD's mount_nfs(8)
rejects "-o mountport" outright ("option not supported", per the
reporter's log) and has no "tcp" suboption either, since it selects
TCP with the separate "-T" flag instead of an -o suboption.
Add a runtime.GOOS == "openbsd" branch that builds the option list
OpenBSD's mount_nfs actually accepts: "-o port=N" plus "-T" for TCP,
with no mountport option since OpenBSD's mountd is located via
portmap rather than a fixed, settable port. This follows the same
GOOS-branching pattern already used in this file's unmount function
(darwin) and in cmd/cmount/mount.go for openbsd/freebsd differences.
FreeBSD's mount_nfs(8) documents "port=", "mountport=" and "tcp" as
-o suboptions identical to Linux, so the existing option set is left
unchanged for freebsd and all other platforms.
Verified by cross-compiling (go build and go vet) for GOOS=openbsd,
freebsd, linux and darwin, all of which succeed. Actually mounting
via mount_nfs on OpenBSD needs a BSD machine to confirm at runtime,
which wasn't available here.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
47fb3c7156