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| | with import ./. {};
let
makeSquashfs = (callPackage nixos/lib/make-squashfs.nix {}).override;
kernel' = linux_cros;
kernel = with import lib/kernel.nix { inherit lib; inherit (kernel') version; };
kernel'.override { structuredExtraConfig = {
VIRTIO_PCI = yes;
VIRTIO_BLK = yes;
VIRTIO_WL = yes;
VIRTIO_NET = yes;
DEVTMPFS_MOUNT = yes;
SQUASHFS = yes;
# VOP is needed to work around a Kconfig bug:
# https://lore.kernel.org/lkml/87wob4tf9b.fsf@alyssa.is/
VOP = yes;
VOP_BUS = yes;
HW_RANDOM = yes;
HW_RANDOM_VIRTIO = yes;
NET_9P = yes;
"9P_FS" = yes;
}; };
login = writeScript "login" ''
#! ${execline}/bin/execlineb -s0
unexport !
${busybox}/bin/login -p -f root $@
'';
makeServicesDir = services: with lib;
let
services' = {
".s6-svscan" = {
finish = writeScript "init-stage3" ''
#! ${execline}/bin/execlineb -P
foreground { s6-nuke -th }
s6-sleep -m -- 2000
foreground { s6-nuke -k }
wait { }
s6-linux-init-hpr -fr
'';
} // services.".s6-svscan" or {};
} // services;
in
runCommandNoCC "services" {} ''
mkdir $out
${concatStrings (mapAttrsToList (name: attrs: ''
mkdir $out/${name}
${concatStrings (mapAttrsToList (key: value: ''
cp ${value} $out/${name}/${key}
'') attrs)}
'') services')}
'';
makeStage1 = { run ? null, tapFD }: writeScript "init-stage1" ''
#! ${execline}/bin/execlineb -P
export PATH ${lib.makeBinPath
[ s6-linux-init s6-portable-utils s6-linux-utils s6 execline busybox ]}
${s6}/bin/s6-setsid -qb --
umask 022
if { s6-mount -t tmpfs -o mode=0755 tmpfs /run }
if { s6-hiercopy /etc/service /run/service }
emptyenv -p
background {
s6-setsid --
if { s6-mkdir -p /run/user/0 /dev/pts /dev/shm }
if { s6-mount -t devpts -o gid=4,mode=620 none /dev/pts }
if { s6-mount -t tmpfs none /dev/shm }
if { s6-mount -t proc none /proc }
if { ip addr add 10.0.10${toString tapFD}.2/24 dev eth0 }
if { ip link set eth0 up }
${lib.optionalString (run != null) "if {"}
ip route add default via 10.0.10${toString tapFD}.1
${lib.optionalString (run != null) ''
}
export XDG_RUNTIME_DIR /run/user/0
foreground { ${run} }
importas -i ? ?
if { s6-echo STATUS: $? }
s6-svscanctl -6 /run/service
''}
}
unexport !
cd /run/service
s6-svscan
'';
passwd = writeText "passwd" ''
root:x:0:0:System administrator:/:/bin/sh
'';
makeRootfs = { services, run ? null, tapFD }: runCommand "rootfs" {} ''
mkdir $out
cd $out
mkdir bin sbin dev etc proc run tmp
ln -s ${dash}/bin/dash bin/sh
ln -s ${makeStage1 { inherit run tapFD; }} sbin/init
cp ${passwd} etc/passwd
touch etc/login.defs
cp -r ${makeServicesDir services} etc/service
'';
makeRootSquashfs = rootfs: runCommand "root-squashfs" {} ''
cd ${rootfs}
(
grep -v ^${rootfs} ${writeReferencesToFile rootfs}
printf "%s\n" *
) \
| xargs tar -cP --owner root:0 --group root:0 --hard-dereference \
| ${squashfs-tools-ng}/bin/tar2sqfs $out
'';
makeVM =
{ name, services ? {}, run ? null, wayland ? false, tapFD ? null }:
let
rootfs = makeRootfs { inherit run services tapFD; };
in writeShellScript name ''
exec ${crosvm}/bin/crosvm run \
${lib.optionalString wayland
"--wayland-sock $XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"} \
${lib.optionalString (tapFD != null) "--tap-fd ${toString tapFD}"} \
-p init=/sbin/init \
--root ${makeRootSquashfs rootfs} \
${kernel}/bzImage
'';
fsVM = makeVM {
name = "fs-vm";
tapFD = 3;
services.rust-9p.run = writeScript "rust-9p-run" ''
#! ${execline}/bin/execlineb -P
${rust-9p}/bin/unpfs tcp!0.0.0.0!564 /
'';
};
waylandVM = makeVM {
name = "wayland-vm";
services.getty.run = writeScript "getty-run" ''
#! ${execline}/bin/execlineb -P
${busybox}/bin/getty -i -n -l ${login} 38400 ttyS0
'';
run = ''
background {
if { s6-mkdir /run/mnt }
loopwhilex
if -n { s6-mount -t 9p 10.0.103.2 /run/mnt }
s6-sleep 1
}
${sommelier}/bin/sommelier
${westonLite}/bin/weston-terminal --shell /bin/sh
'';
wayland = true;
tapFD = 4;
};
in
writeScript "crosvm" ''
#! ${execline}/bin/execlineb -P
importas -i xdg_runtime_dir XDG_RUNTIME_DIR
importas -i wayland_display WAYLAND_DISPLAY
sudo
importas -i uid SUDO_UID
importas -i gid SUDO_GID
${mktuntap}/bin/mktuntap -pvB 3
importas -iu tap_name_3 TUNTAP_NAME
${mktuntap}/bin/mktuntap -pvB 4
importas -iu tap_name_4 TUNTAP_NAME
if { ip addr add 10.0.103.1/24 dev $tap_name_3 }
if { ip addr add 10.0.104.1/24 dev $tap_name_4 }
if { ip link set $tap_name_3 up }
if { ip link set $tap_name_4 up }
${s6}/bin/s6-applyuidgid -u $uid -g $gid
export XDG_RUNTIME_DIR $xdg_runtime_dir
export WAYLAND_DISPLAY $wayland_display
background { ${fsVM} }
${waylandVM}
''
|