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Bug#409272: nfsmount: incompatible with nfsv4

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Trent W. Buck wrote:
>   3. A single mount(2) call also works!
> 
> It is quite annoying that we need *anything* special in userland, because
> a nfsvers=4.2,sec=sys mount requires only 2049/tcp (no other ports/services), and
> the actual filesystem is in-kernel, so
> really all that should be needed is enough of a C program to issue a single mount(2)!
> 
> As an experiment, I tried do compile in EXACTLY that, and it works for me:
> 
>     root@main:~# >nfsmount.c printf '#include <stdlib.h>\n#include <sys/mount.h>\nint main() {exit(mount("10.0.2.100:/srv/netboot", "/mnt", "nfs", 0, "vers=4.2,addr=10.0.2.100,clientaddr=10.0.2.15"));}'
>     root@main:~# klcc -o nfsmount nfsmount.c
>     root@main:~# ./nfsmount; echo $?
>     ./nfsmount; echo $?
>     Nov 17 10:11:31 main.lan kernel: process '/root/nfsmount' started with executable stack
>     0
> 
> This is pretty narrow in scope and is probably achievable.
> It allows you to boot off NFSv4, without putting glibc into the initrd.

I had a go at actually packaging this (attached), but
it turns out to be slightly harder than I thought (see comments in mount.nfs.c).
I don't have time to pursue this further.

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Bug#409272: nfsmount: incompatible with nfsv4 "Trent W. Buck" <trentbuck@gmail.com> - 2021-11-17 00:30 +0100
  Bug#409272: nfsmount: incompatible with nfsv4 "Trent W. Buck" <trentbuck@gmail.com> - 2021-11-17 01:50 +0100

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