patches and low-level development discussion

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
 #!/bin/execlineb -W
# SPDX-License-Identifier: EUPL-1.2+
# SPDX-FileCopyrightText: 2024-2025 Alyssa Ross <hi@alyssa.is>

backtick -E dir { mktemp -d /run/vm/by-id/XXXXXX }
backtick -E id { basename -- $dir }
if { useradd -P /run -Urd / -s /bin/nologin gpu-${id} }
if { useradd -P /run -Urd / -s /bin/nologin xdp-spectrum-${id} }

if {
  elgetpositionals

  if { install -do fs /run/configs/${id}/fs }

  if {
    ln -s /usr/lib/spectrum/img/appvm/blk /usr/lib/spectrum/img/appvm/vmlinux
      /run/configs/${id}
  }

  if { ln -s /run/configs/${id} ${dir}/config }

  if { create-vm-dependencies $id }

  if {
    s6-envuidgid fs
    s6-applyuidgid -Uzu 0
    nsenter --preserve-credentials -S0
      --mount=/run/vm/by-id/${id}/mount
      --user=/run/vm/by-id/${id}/user
    cd /run/fs/${id}/config
    if { redirfd -w 1 type echo flatpak }
    mount-flatpak $@
  }

  piperw 4 3
  background {
    fdclose 3
    fdmove 0 4

    # Wait for the VMM to be up, then start the VM.
    if { redirfd -w 1 /dev/null head -1 }
    vm-start $id
  }
  fdclose 4

  foreground { run-vmm $id }
}

if { s6-instance-delete -- /run/service/vm-services $id }

if { umount ${dir}/mount } # mount namespace
if { umount ${dir}/mount } # private bind mount
if { umount ${dir}/user } # user namespace
if { umount ${dir}/user } # private bind mount
rm -r $dir /run/configs/${id}