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Restore guest agent unix socket functionality
Make both vsock and virtio explicit, instead of hardcoding internal filenames in the agents. Fallback to to the unix. Signed-off-by: Anders F Björklund <[email protected]>
1 parent a21b5f3 commit 6dd4229

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9 files changed

+94
-26
lines changed

9 files changed

+94
-26
lines changed

‎cmd/lima-guestagent/daemon_linux.go

Lines changed: 22 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,6 @@ import (
1111
"github.com/lima-vm/lima/pkg/guestagent"
1212
"github.com/lima-vm/lima/pkg/guestagent/api/server"
1313
"github.com/lima-vm/lima/pkg/guestagent/serialport"
14-
"github.com/lima-vm/lima/pkg/store/filenames"
1514
"github.com/mdlayher/vsock"
1615
"github.com/sirupsen/logrus"
1716
"github.com/spf13/cobra"
@@ -25,26 +24,23 @@ func newDaemonCommand() *cobra.Command {
2524
}
2625
daemonCommand.Flags().Duration("tick", 3*time.Second, "tick for polling events")
2726
daemonCommand.Flags().Int("vsock-port", 0, "use vsock server instead a UNIX socket")
27+
daemonCommand.Flags().String("virtio-port", "", "use virtio server instead a UNIX socket")
2828
return daemonCommand
2929
}
3030

31-
var (
32-
vSockPort = 0
33-
34-
virtioPort = "/dev/virtio-ports/" + filenames.VirtioPort
35-
)
36-
3731
func daemonAction(cmd *cobra.Command, _ []string) error {
32+
socket := "/run/lima-guestagent.sock"
3833
tick, err := cmd.Flags().GetDuration("tick")
3934
if err != nil {
4035
return err
4136
}
42-
vSockPortOverride, err := cmd.Flags().GetInt("vsock-port")
37+
vSockPort, err := cmd.Flags().GetInt("vsock-port")
4338
if err != nil {
4439
return err
4540
}
46-
if vSockPortOverride != 0 {
47-
vSockPort = vSockPortOverride
41+
virtioPort, err := cmd.Flags().GetString("virtio-port")
42+
if err != nil {
43+
return err
4844
}
4945
if tick == 0 {
5046
return errors.New("tick must be specified")
@@ -72,10 +68,14 @@ func daemonAction(cmd *cobra.Command, _ []string) error {
7268
r := mux.NewRouter()
7369
server.AddRoutes(r, backend)
7470
srv := &http.Server{Handler: r}
71+
err = os.RemoveAll(socket)
72+
if err != nil {
73+
return err
74+
}
7575

7676
var l net.Listener
77-
if _, err := os.Stat(virtioPort); err == nil {
78-
qemuL, err := serialport.Listen(virtioPort)
77+
if virtioPort != "" {
78+
qemuL, err := serialport.Listen("/dev/virtio-ports/" + virtioPort)
7979
if err != nil {
8080
return err
8181
}
@@ -88,6 +88,16 @@ func daemonAction(cmd *cobra.Command, _ []string) error {
8888
}
8989
l = vsockL
9090
logrus.Infof("serving the guest agent on vsock port: %d", vSockPort)
91+
} else {
92+
socketL, err := net.Listen("unix", socket)
93+
if err != nil {
94+
return err
95+
}
96+
if err := os.Chmod(socket, 0o777); err != nil {
97+
return err
98+
}
99+
l = socketL
100+
logrus.Infof("serving the guest agent on %q", socket)
91101
}
92102
return srv.Serve(l)
93103
}

‎pkg/cidata/cidata.TEMPLATE.d/boot/25-guestagent-base.sh

Lines changed: 8 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -28,7 +28,7 @@ name="lima-guestagent"
2828
description="Forward ports to the lima-hostagent"
2929
3030
command=${LIMA_CIDATA_GUEST_INSTALL_PREFIX}/bin/lima-guestagent
31-
command_args="daemon --vsock-port "${LIMA_CIDATA_VSOCK_PORT}""
31+
command_args="daemon --vsock-port "${LIMA_CIDATA_VSOCK_PORT}" --virtio-port "${LIMA_CIDATA_VIRTIO_PORT}""
3232
command_background=true
3333
pidfile="/run/lima-guestagent.pid"
3434
EOF
@@ -40,5 +40,11 @@ else
4040
# Remove legacy systemd service
4141
rm -f "${LIMA_CIDATA_HOME}/.config/systemd/user/lima-guestagent.service"
4242

43-
sudo "${LIMA_CIDATA_GUEST_INSTALL_PREFIX}"/bin/lima-guestagent install-systemd --vsock-port "${LIMA_CIDATA_VSOCK_PORT}"
43+
if [ "${LIMA_CIDATA_VSOCK_PORT}" != "0" ]; then
44+
sudo "${LIMA_CIDATA_GUEST_INSTALL_PREFIX}"/bin/lima-guestagent install-systemd --vsock-port "${LIMA_CIDATA_VSOCK_PORT}"
45+
elif [ "${LIMA_CIDATA_VIRTIO_PORT}" != "" ]; then
46+
sudo "${LIMA_CIDATA_GUEST_INSTALL_PREFIX}"/bin/lima-guestagent install-systemd --virtio-port "${LIMA_CIDATA_VIRTIO_PORT}"
47+
else
48+
sudo "${LIMA_CIDATA_GUEST_INSTALL_PREFIX}"/bin/lima-guestagent install-systemd
49+
fi
4450
fi

‎pkg/cidata/cidata.TEMPLATE.d/lima.env

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -41,6 +41,7 @@ LIMA_CIDATA_SKIP_DEFAULT_DEPENDENCY_RESOLUTION=
4141
{{- end}}
4242
LIMA_CIDATA_VMTYPE={{ .VMType }}
4343
LIMA_CIDATA_VSOCK_PORT={{ .VSockPort }}
44+
LIMA_CIDATA_VIRTIO_PORT={{ .VirtioPort}}
4445
{{- if .Plain}}
4546
LIMA_CIDATA_PLAIN=1
4647
{{- else}}

‎pkg/cidata/cidata.go

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -110,7 +110,7 @@ func setupEnv(y *limayaml.LimaYAML, args TemplateArgs) (map[string]string, error
110110
return env, nil
111111
}
112112

113-
func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML, udpDNSLocalPort, tcpDNSLocalPort int, nerdctlArchive string, vsockPort int) error {
113+
func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML, udpDNSLocalPort, tcpDNSLocalPort int, nerdctlArchive string, vsockPort int, virtioPort string) error {
114114
if err := limayaml.Validate(*y, false); err != nil {
115115
return err
116116
}
@@ -135,6 +135,7 @@ func GenerateISO9660(instDir, name string, y *limayaml.LimaYAML, udpDNSLocalPort
135135
RosettaBinFmt: *y.Rosetta.BinFmt,
136136
VMType: *y.VMType,
137137
VSockPort: vsockPort,
138+
VirtioPort: virtioPort,
138139
Plain: *y.Plain,
139140
}
140141

‎pkg/cidata/template.go

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -81,6 +81,7 @@ type TemplateArgs struct {
8181
SkipDefaultDependencyResolution bool
8282
VMType string
8383
VSockPort int
84+
VirtioPort string
8485
Plain bool
8586
}
8687

‎pkg/driver/driver.go

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -73,6 +73,7 @@ type BaseDriver struct {
7373

7474
SSHLocalPort int
7575
VSockPort int
76+
VirtioPort string
7677
}
7778

7879
var _ Driver = (*BaseDriver)(nil)
@@ -138,5 +139,5 @@ func (d *BaseDriver) ListSnapshots(_ context.Context) (string, error) {
138139
}
139140

140141
func (d *BaseDriver) GuestAgentConn(_ context.Context) (net.Conn, error) {
141-
return nil, fmt.Errorf("unimplemented")
142+
return nil, nil
142143
}

‎pkg/hostagent/hostagent.go

Lines changed: 35 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -53,7 +53,8 @@ type HostAgent struct {
5353
eventEnc *json.Encoder
5454
eventEncMu sync.Mutex
5555

56-
vSockPort int
56+
vSockPort int
57+
virtioPort string
5758

5859
clientMu sync.RWMutex
5960
client guestagentclient.GuestAgentClient
@@ -114,6 +115,7 @@ func New(instName string, stdout io.Writer, sigintCh chan os.Signal, opts ...Opt
114115
}
115116

116117
vSockPort := 0
118+
virtioPort := ""
117119
if *y.VMType == limayaml.VZ {
118120
vSockPort = 2222
119121
} else if *y.VMType == limayaml.WSL2 {
@@ -122,9 +124,11 @@ func New(instName string, stdout io.Writer, sigintCh chan os.Signal, opts ...Opt
122124
logrus.WithError(err).Error("failed to get free VSock port")
123125
}
124126
vSockPort = port
127+
} else if *y.VMType == limayaml.QEMU {
128+
virtioPort = filenames.VirtioPort
125129
}
126130

127-
if err := cidata.GenerateISO9660(inst.Dir, instName, y, udpDNSLocalPort, tcpDNSLocalPort, o.nerdctlArchive, vSockPort); err != nil {
131+
if err := cidata.GenerateISO9660(inst.Dir, instName, y, udpDNSLocalPort, tcpDNSLocalPort, o.nerdctlArchive, vSockPort, virtioPort); err != nil {
128132
return nil, err
129133
}
130134

@@ -157,6 +161,7 @@ func New(instName string, stdout io.Writer, sigintCh chan os.Signal, opts ...Opt
157161
Yaml: y,
158162
SSHLocalPort: sshLocalPort,
159163
VSockPort: vSockPort,
164+
VirtioPort: virtioPort,
160165
})
161166

162167
a := &HostAgent{
@@ -173,6 +178,7 @@ func New(instName string, stdout io.Writer, sigintCh chan os.Signal, opts ...Opt
173178
sigintCh: sigintCh,
174179
eventEnc: json.NewEncoder(stdout),
175180
vSockPort: vSockPort,
181+
virtioPort: virtioPort,
176182
}
177183
return a, nil
178184
}
@@ -528,8 +534,6 @@ func (a *HostAgent) close() error {
528534
}
529535

530536
func (a *HostAgent) watchGuestAgentEvents(ctx context.Context) {
531-
// TODO: use vSock (when QEMU for macOS gets support for vSock)
532-
533537
// Setup all socket forwards and defer their teardown
534538
if *a.y.VMType != limayaml.WSL2 {
535539
logrus.Debugf("Forwarding unix sockets")
@@ -541,6 +545,12 @@ func (a *HostAgent) watchGuestAgentEvents(ctx context.Context) {
541545
}
542546
}
543547

548+
// if needed, forward the guest agent unix socket
549+
d := a.driver.(*driver.BaseDriver)
550+
forwardUnix := d.VSockPort == 0 && d.VirtioPort == ""
551+
localUnix := filepath.Join(a.instDir, filenames.GuestAgentSock)
552+
remoteUnix := "/run/lima-guestagent.sock"
553+
544554
a.onClose = append(a.onClose, func() error {
545555
logrus.Debugf("Stop forwarding unix sockets")
546556
var errs []error
@@ -553,9 +563,19 @@ func (a *HostAgent) watchGuestAgentEvents(ctx context.Context) {
553563
}
554564
}
555565
}
566+
if forwardUnix {
567+
if err := forwardSSH(context.Background(), a.sshConfig, a.sshLocalPort, localUnix, remoteUnix, verbCancel, false); err != nil {
568+
errs = append(errs, err)
569+
}
570+
}
556571
return errors.Join(errs...)
557572
})
558573
for {
574+
if a.client == nil || !isGuestAgentSocketAccessible(ctx, a.client) {
575+
if forwardUnix {
576+
_ = forwardSSH(ctx, a.sshConfig, a.sshLocalPort, localUnix, remoteUnix, verbForward, false)
577+
}
578+
}
559579
client, err := a.getOrCreateClient(ctx)
560580
if err == nil {
561581
if err := a.processGuestAgentEvents(ctx, client); err != nil {
@@ -590,8 +610,18 @@ func (a *HostAgent) getOrCreateClient(ctx context.Context) (guestagentclient.Gue
590610
return a.client, err
591611
}
592612

593-
func (a *HostAgent) createClient(ctx context.Context) (guestagentclient.GuestAgentClient, error) {
613+
func (a *HostAgent) createConnection(ctx context.Context) (net.Conn, error) {
594614
conn, err := a.driver.GuestAgentConn(ctx)
615+
// default to forwarded sock
616+
if conn == nil && err == nil {
617+
var d net.Dialer
618+
conn, err = d.DialContext(ctx, "unix", filepath.Join(a.instDir, filenames.GuestAgentSock))
619+
}
620+
return conn, err
621+
}
622+
623+
func (a *HostAgent) createClient(ctx context.Context) (guestagentclient.GuestAgentClient, error) {
624+
conn, err := a.createConnection(ctx)
595625
if err != nil {
596626
return nil, err
597627
}

‎pkg/hostagent/requirements.go

Lines changed: 20 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,6 @@ import (
66
"time"
77

88
"github.com/lima-vm/lima/pkg/limayaml"
9-
"github.com/lima-vm/lima/pkg/store/filenames"
109
"github.com/lima-vm/sshocker/pkg/ssh"
1110
"github.com/sirupsen/logrus"
1211
)
@@ -136,7 +135,7 @@ Also see "/var/log/cloud-init-output.log" in the guest.
136135
A possible workaround is to run "lima-guestagent install-systemd" in the guest.
137136
`, a.vSockPort),
138137
})
139-
} else {
138+
} else if a.virtioPort != "" {
140139
req = append(req, requirement{
141140
description: "the guest agent to be running",
142141
script: fmt.Sprintf(`#!/bin/bash
@@ -146,12 +145,29 @@ if ! timeout 30s bash -c "until sudo fuser \"${sock}\" || sudo lsof \"${sock}\";
146145
echo >&2 "lima-guestagent is not installed yet"
147146
exit 1
148147
fi
149-
`, filenames.VirtioPort),
148+
`, a.virtioPort),
150149
debugHint: fmt.Sprintf(`The guest agent with serialport /dev/virtio-ports/%s does not seem running.
151150
Make sure that you are using an officially supported image.
152151
Also see "/var/log/cloud-init-output.log" in the guest.
153152
A possible workaround is to run "lima-guestagent install-systemd" in the guest.
154-
`, filenames.VirtioPort),
153+
`, a.virtioPort),
154+
})
155+
} else {
156+
req = append(req, requirement{
157+
description: "the guest agent to be running",
158+
script: `#!/bin/bash
159+
set -eux -o pipefail
160+
sock="/run/lima-guestagent.sock"
161+
if ! timeout 30s bash -c "until [ -S \"${sock}\" ]; do sleep 3; done"; then
162+
echo >&2 "lima-guestagent is not installed yet"
163+
exit 1
164+
fi
165+
`,
166+
debugHint: `The guest agent (/run/lima-guestagent.sock) does not seem running.
167+
Make sure that you are using an officially supported image.
168+
Also see "/var/log/cloud-init-output.log" in the guest.
169+
A possible workaround is to run "lima-guestagent install-systemd" in the guest.
170+
`,
155171
})
156172
}
157173
return req

‎website/content/en/docs/dev/Internals/_index.md

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -72,10 +72,12 @@ VNC:
7272

7373
Guest agent:
7474

75-
Each drivers use their own mode of communication
75+
Each drivers use their own mode of communication
7676
- `qemu`: uses virtio-port `io.lima-vm.guest_agent.0`
7777
- `vz`: uses vsock port 2222
7878
- `wsl2`: uses free random vsock port
79+
The fallback is to use port forward over ssh port
80+
- `ga.sock`: Forwarded to `/run/lima-guestagent.sock` in the guest, via SSH
7981

8082
Host agent:
8183
- `ha.pid`: hostagent PID

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