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|
{ stdenv, writeScript, vmTools, makeInitrd
, samba, vde2, openssh, socat, netcat-gnu, coreutils, gnugrep, gzip
, runtimeShell
}:
{ sshKey
, qemuArgs ? []
, command ? "sync"
, suspendTo ? null
, resumeFrom ? null
, installMode ? false
}:
with stdenv.lib;
let
preInitScript = writeScript "preinit.sh" ''
#!${vmTools.initrdUtils}/bin/ash -e
export PATH=${vmTools.initrdUtils}/bin
mount -t proc none /proc
mount -t sysfs none /sys
for arg in $(cat /proc/cmdline); do
if [ "x''${arg#command=}" != "x$arg" ]; then
command="''${arg#command=}"
fi
done
for i in $(cat ${modulesClosure}/insmod-list); do
insmod $i
done
mkdir -p /dev /fs
mount -t tmpfs none /dev
mknod /dev/null c 1 3
mknod /dev/zero c 1 5
mknod /dev/random c 1 8
mknod /dev/urandom c 1 9
mknod /dev/tty c 5 0
ifconfig lo up
ifconfig eth0 up 192.168.0.2
mount -t tmpfs none /fs
mkdir -p /fs/nix/store /fs/xchg /fs/dev /fs/sys /fs/proc /fs/etc /fs/tmp
mount -o bind /dev /fs/dev
mount -t sysfs none /fs/sys
mount -t proc none /fs/proc
mount -t 9p \
-o trans=virtio,version=9p2000.L,cache=loose \
store /fs/nix/store
mount -t 9p \
-o trans=virtio,version=9p2000.L \
xchg /fs/xchg
echo root:x:0:0::/root:/bin/false > /fs/etc/passwd
set +e
chroot /fs $command $out
echo $? > /fs/xchg/in-vm-exit
poweroff -f
'';
initrd = makeInitrd {
contents = singleton {
object = preInitScript;
symlink = "/init";
};
};
loopForever = "while :; do ${coreutils}/bin/sleep 1; done";
initScript = writeScript "init.sh" (''
#!${runtimeShell}
${coreutils}/bin/cp -L "${sshKey}" /ssh.key
${coreutils}/bin/chmod 600 /ssh.key
'' + (if installMode then ''
echo -n "Waiting for Windows installation to finish..."
while ! ${netcat-gnu}/bin/netcat -z 192.168.0.1 22; do
echo -n .
# Print a dot every 10 seconds only to shorten line length.
${coreutils}/bin/sleep 10
done
${coreutils}/bin/touch /xchg/waiting_done
echo " success."
# Loop forever, because this VM is going to be killed.
${loopForever}
'' else ''
${coreutils}/bin/mkdir -p /etc/samba /etc/samba/private \
/var/lib/samba /var/log /var/run
${coreutils}/bin/cat > /etc/samba/smb.conf <<CONFIG
[global]
security = user
map to guest = Bad User
guest account = root
workgroup = cygwin
netbios name = controller
server string = %h
log level = 1
max log size = 1000
log file = /var/log/samba.log
[nixstore]
path = /nix/store
writable = yes
guest ok = yes
[xchg]
path = /xchg
writable = yes
guest ok = yes
CONFIG
${samba}/sbin/nmbd -D
${samba}/sbin/smbd -D
echo -n "Waiting for Windows VM to become available..."
while ! ${netcat-gnu}/bin/netcat -z 192.168.0.1 22; do
echo -n .
${coreutils}/bin/sleep 1
done
${coreutils}/bin/touch /xchg/waiting_done
echo " success."
${openssh}/bin/ssh \
-o UserKnownHostsFile=/dev/null \
-o StrictHostKeyChecking=no \
-i /ssh.key \
-l Administrator \
192.168.0.1 -- ${lib.escapeShellArg command}
'') + optionalString (suspendTo != null) ''
${coreutils}/bin/touch /xchg/suspend_now
${loopForever}
'');
kernelAppend = concatStringsSep " " [
"panic=1"
"loglevel=4"
"console=tty1"
"console=ttyS0"
"command=${initScript}"
];
controllerQemuArgs = concatStringsSep " " (maybeKvm64 ++ [
"-pidfile $CTRLVM_PIDFILE"
"-nographic"
"-no-reboot"
"-virtfs local,path=/nix/store,security_model=none,mount_tag=store"
"-virtfs local,path=$XCHG_DIR,security_model=none,mount_tag=xchg"
"-kernel ${modulesClosure.kernel}/bzImage"
"-initrd ${initrd}/initrd"
"-append \"${kernelAppend}\""
"-net nic,vlan=0,macaddr=52:54:00:12:01:02,model=virtio"
"-net vde,vlan=0,sock=$QEMU_VDE_SOCKET"
]);
maybeKvm64 = optional (stdenv.hostPlatform.system == "x86_64-linux") "-cpu kvm64";
cygwinQemuArgs = concatStringsSep " " (maybeKvm64 ++ [
"-monitor unix:$MONITOR_SOCKET,server,nowait"
"-pidfile $WINVM_PIDFILE"
"-nographic"
"-net nic,vlan=0,macaddr=52:54:00:12:01:01"
"-net vde,vlan=0,sock=$QEMU_VDE_SOCKET"
"-rtc base=2010-01-01,clock=vm"
] ++ qemuArgs ++ optionals (resumeFrom != null) [
"-incoming 'exec: ${gzip}/bin/gzip -c -d \"${resumeFrom}\"'"
]);
modulesClosure = overrideDerivation vmTools.modulesClosure (o: {
rootModules = o.rootModules ++ singleton "virtio_net";
});
preVM = ''
(set; declare -p) > saved-env
XCHG_DIR="$(${coreutils}/bin/mktemp -d nix-vm.XXXXXXXXXX --tmpdir)"
${coreutils}/bin/mv saved-env "$XCHG_DIR/"
eval "$preVM"
QEMU_VDE_SOCKET="$(pwd)/vde.ctl"
MONITOR_SOCKET="$(pwd)/monitor"
WINVM_PIDFILE="$(pwd)/winvm.pid"
CTRLVM_PIDFILE="$(pwd)/ctrlvm.pid"
${vde2}/bin/vde_switch -s "$QEMU_VDE_SOCKET" --dirmode 0700 &
echo 'alive?' | ${socat}/bin/socat - \
UNIX-CONNECT:$QEMU_VDE_SOCKET/ctl,retry=20
'';
vmExec = ''
${vmTools.qemuProg} ${controllerQemuArgs} &
${vmTools.qemuProg} ${cygwinQemuArgs} &
echo -n "Waiting for VMs to start up..."
timeout=60
while ! test -e "$WINVM_PIDFILE" -a -e "$CTRLVM_PIDFILE"; do
timeout=$(($timeout - 1))
echo -n .
if test $timeout -le 0; then
echo " timed out."
exit 1
fi
${coreutils}/bin/sleep 1
done
echo " done."
'';
checkDropOut = ''
if ! test -e "$XCHG_DIR/waiting_done" &&
! kill -0 $(< "$WINVM_PIDFILE"); then
echo "Windows VM has dropped out early, bailing out!" >&2
exit 1
fi
'';
toMonitor = "${socat}/bin/socat - UNIX-CONNECT:$MONITOR_SOCKET";
postVM = if suspendTo != null then ''
while ! test -e "$XCHG_DIR/suspend_now"; do
${checkDropOut}
${coreutils}/bin/sleep 1
done
${toMonitor} <<CMD
stop
migrate_set_speed 4095m
migrate "exec:${gzip}/bin/gzip -c > '${suspendTo}'"
CMD
echo -n "Waiting for memory dump to finish..."
while ! echo info migrate | ${toMonitor} | \
${gnugrep}/bin/grep -qi '^migration *status: *complete'; do
${coreutils}/bin/sleep 1
echo -n .
done
echo " done."
echo quit | ${toMonitor}
wait $(< "$WINVM_PIDFILE")
eval "$postVM"
exit 0
'' else if installMode then ''
wait $(< "$WINVM_PIDFILE")
eval "$postVM"
exit 0
'' else ''
while kill -0 $(< "$CTRLVM_PIDFILE"); do
${checkDropOut}
done
if ! test -e "$XCHG_DIR/in-vm-exit"; then
echo "Virtual machine didn't produce an exit code."
exit 1
fi
eval "$postVM"
exit $(< "$XCHG_DIR/in-vm-exit")
'';
in writeScript "run-cygwin-vm.sh" ''
#!${stdenv.shell} -e
${preVM}
${vmExec}
${postVM}
''
|