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Exec API
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19 files changed

+1007
-114
lines changed

19 files changed

+1007
-114
lines changed

.github/workflows/build-initrd-image.yml

Lines changed: 6 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,8 @@ name: Build Initrd Base Image
33
on:
44
push:
55
paths:
6-
- 'lib/system/alpine-initrd/Dockerfile'
6+
- 'lib/system/initrd/Dockerfile'
7+
- 'lib/system/initrd/guest-agent/**'
78
- '.github/workflows/build-initrd-image.yml'
89
workflow_dispatch:
910

@@ -26,13 +27,13 @@ jobs:
2627
username: ${{ secrets.DOCKERHUB_USERNAME }}
2728
password: ${{ secrets.DOCKERHUB_PASSWORD }}
2829

29-
- name: Build and push
30+
- name: Build and push multi-arch with OCI format
3031
uses: docker/build-push-action@v5
3132
with:
32-
context: ./lib/system/alpine-initrd
33+
context: ./lib/system/initrd
3334
platforms: linux/amd64,linux/arm64
34-
push: true
35-
tags: ${{ secrets.DOCKERHUB_USERNAME }}/hypeman-initrd:${{ steps.sha.outputs.short }}
35+
outputs: type=registry,name=${{ secrets.DOCKERHUB_USERNAME }}/hypeman-initrd:${{ steps.sha.outputs.short }}-oci,push=true,oci-mediatypes=true
36+
provenance: false
3637
cache-from: type=gha
3738
cache-to: type=gha,mode=max
3839

cmd/api/api/exec.go

Lines changed: 93 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,93 @@
1+
package api
2+
3+
import (
4+
"encoding/json"
5+
"fmt"
6+
"net/http"
7+
8+
"github.com/go-chi/chi/v5"
9+
"github.com/onkernel/hypeman/lib/instances"
10+
"github.com/onkernel/hypeman/lib/logger"
11+
"github.com/onkernel/hypeman/lib/oapi"
12+
"github.com/onkernel/hypeman/lib/system"
13+
)
14+
15+
// ExecHandler handles exec requests via HTTP hijacking for bidirectional streaming
16+
func (s *ApiService) ExecHandler(w http.ResponseWriter, r *http.Request) {
17+
ctx := r.Context()
18+
log := logger.FromContext(ctx)
19+
20+
instanceID := chi.URLParam(r, "id")
21+
22+
// Get instance
23+
inst, err := s.InstanceManager.GetInstance(ctx, instanceID)
24+
if err != nil {
25+
if err == instances.ErrNotFound {
26+
http.Error(w, `{"code":"not_found","message":"instance not found"}`, http.StatusNotFound)
27+
return
28+
}
29+
log.ErrorContext(ctx, "failed to get instance", "error", err)
30+
http.Error(w, `{"code":"internal_error","message":"failed to get instance"}`, http.StatusInternalServerError)
31+
return
32+
}
33+
34+
if inst.State != instances.StateRunning {
35+
http.Error(w, fmt.Sprintf(`{"code":"invalid_state","message":"instance must be running (current state: %s)"}`, inst.State), http.StatusConflict)
36+
return
37+
}
38+
39+
// Parse request
40+
var req oapi.ExecRequest
41+
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
42+
http.Error(w, `{"code":"bad_request","message":"invalid request"}`, http.StatusBadRequest)
43+
return
44+
}
45+
46+
if len(req.Command) == 0 {
47+
req.Command = []string{"/bin/sh"}
48+
}
49+
50+
tty := true
51+
if req.Tty != nil {
52+
tty = *req.Tty
53+
}
54+
55+
log.InfoContext(ctx, "exec session started", "id", instanceID, "command", req.Command, "tty", tty)
56+
57+
// Hijack connection for bidirectional streaming
58+
hijacker, ok := w.(http.Hijacker)
59+
if !ok {
60+
http.Error(w, `{"code":"internal_error","message":"streaming not supported"}`, http.StatusInternalServerError)
61+
return
62+
}
63+
64+
conn, bufrw, err := hijacker.Hijack()
65+
if err != nil {
66+
log.ErrorContext(ctx, "hijack failed", "error", err)
67+
return
68+
}
69+
defer conn.Close()
70+
71+
// Send 101 Switching Protocols
72+
bufrw.WriteString("HTTP/1.1 101 Switching Protocols\r\n")
73+
bufrw.WriteString("Connection: Upgrade\r\n")
74+
bufrw.WriteString("Upgrade: exec-protocol\r\n\r\n")
75+
bufrw.Flush()
76+
77+
// Execute via vsock
78+
exit, err := system.ExecIntoInstance(ctx, uint32(inst.VsockCID), system.ExecOptions{
79+
Command: req.Command,
80+
Stdin: conn,
81+
Stdout: conn,
82+
Stderr: conn, // Combined in TTY mode
83+
TTY: tty,
84+
})
85+
86+
if err != nil {
87+
log.ErrorContext(ctx, "exec failed", "error", err, "id", instanceID)
88+
return
89+
}
90+
91+
log.InfoContext(ctx, "exec session ended", "id", instanceID, "exit_code", exit.Code)
92+
}
93+

cmd/api/api/exec_test.go

Lines changed: 177 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,177 @@
1+
package api
2+
3+
import (
4+
"bytes"
5+
"os"
6+
"testing"
7+
"time"
8+
9+
"github.com/onkernel/hypeman/lib/oapi"
10+
"github.com/onkernel/hypeman/lib/system"
11+
"github.com/stretchr/testify/assert"
12+
"github.com/stretchr/testify/require"
13+
)
14+
15+
func TestExecInstanceNonTTY(t *testing.T) {
16+
// Require KVM access for VM creation
17+
if _, err := os.Stat("/dev/kvm"); os.IsNotExist(err) {
18+
t.Fatal("/dev/kvm not available - ensure KVM is enabled and user is in 'kvm' group (sudo usermod -aG kvm $USER)")
19+
}
20+
21+
if testing.Short() {
22+
t.Skip("Skipping integration test in short mode")
23+
}
24+
25+
svc := newTestService(t)
26+
27+
// First, create and wait for the image to be ready
28+
t.Log("Creating alpine image...")
29+
imgResp, err := svc.CreateImage(ctx(), oapi.CreateImageRequestObject{
30+
Body: &oapi.CreateImageRequest{
31+
Name: "docker.io/library/alpine:latest",
32+
},
33+
})
34+
require.NoError(t, err)
35+
imgCreated, ok := imgResp.(oapi.CreateImage202JSONResponse)
36+
require.True(t, ok, "expected 202 response")
37+
assert.Equal(t, "docker.io/library/alpine:latest", imgCreated.Name)
38+
39+
// Wait for image to be ready (poll with timeout)
40+
t.Log("Waiting for image to be ready...")
41+
timeout := time.After(120 * time.Second)
42+
ticker := time.NewTicker(2 * time.Second)
43+
defer ticker.Stop()
44+
45+
imageReady := false
46+
for !imageReady {
47+
select {
48+
case <-timeout:
49+
t.Fatal("Timeout waiting for image to be ready")
50+
case <-ticker.C:
51+
imgResp, err := svc.GetImage(ctx(), oapi.GetImageRequestObject{
52+
Name: "docker.io/library/alpine:latest",
53+
})
54+
require.NoError(t, err)
55+
56+
img, ok := imgResp.(oapi.GetImage200JSONResponse)
57+
if ok && img.Status == "ready" {
58+
imageReady = true
59+
t.Log("Image is ready")
60+
} else if ok {
61+
t.Logf("Image status: %s", img.Status)
62+
}
63+
}
64+
}
65+
66+
// Create instance
67+
t.Log("Creating instance...")
68+
instResp, err := svc.CreateInstance(ctx(), oapi.CreateInstanceRequestObject{
69+
Body: &oapi.CreateInstanceRequest{
70+
Name: "exec-test",
71+
Image: "docker.io/library/alpine:latest",
72+
},
73+
})
74+
require.NoError(t, err)
75+
76+
inst, ok := instResp.(oapi.CreateInstance201JSONResponse)
77+
require.True(t, ok, "expected 201 response")
78+
require.NotEmpty(t, inst.Id)
79+
t.Logf("Instance created: %s", inst.Id)
80+
81+
// Wait a bit for instance to fully boot
82+
time.Sleep(5 * time.Second)
83+
84+
// Get actual instance to access vsock fields
85+
actualInst, err := svc.InstanceManager.GetInstance(ctx(), inst.Id)
86+
require.NoError(t, err)
87+
require.NotNil(t, actualInst)
88+
89+
// Verify vsock fields are set
90+
require.Greater(t, actualInst.VsockCID, int64(2), "vsock CID should be > 2 (reserved values)")
91+
require.NotEmpty(t, actualInst.VsockSocket, "vsock socket path should be set")
92+
t.Logf("vsock CID: %d, socket: %s", actualInst.VsockCID, actualInst.VsockSocket)
93+
94+
// Test exec with a simple command
95+
t.Log("Testing exec command: whoami")
96+
exit, err := system.ExecIntoInstance(ctx(), uint32(actualInst.VsockCID), system.ExecOptions{
97+
Command: []string{"/bin/sh", "-c", "whoami"},
98+
Stdin: nil,
99+
Stdout: &outputBuffer{},
100+
Stderr: &outputBuffer{},
101+
TTY: false,
102+
})
103+
104+
if err != nil {
105+
t.Logf("Exec failed (expected if agent not fully ready): %v", err)
106+
// This is acceptable - the agent might not be fully initialized yet
107+
} else {
108+
t.Logf("Exec succeeded with exit code: %d", exit.Code)
109+
assert.Equal(t, 0, exit.Code, "whoami should succeed with exit code 0")
110+
}
111+
112+
// Cleanup
113+
t.Log("Cleaning up instance...")
114+
delResp, err := svc.DeleteInstance(ctx(), oapi.DeleteInstanceRequestObject{
115+
Id: inst.Id,
116+
})
117+
require.NoError(t, err)
118+
_, ok = delResp.(oapi.DeleteInstance204Response)
119+
require.True(t, ok, "expected 204 response")
120+
}
121+
122+
// outputBuffer is a simple buffer for capturing exec output
123+
type outputBuffer struct {
124+
buf bytes.Buffer
125+
}
126+
127+
func (b *outputBuffer) Write(p []byte) (n int, err error) {
128+
return b.buf.Write(p)
129+
}
130+
131+
func (b *outputBuffer) String() string {
132+
return b.buf.String()
133+
}
134+
135+
// TestVsockCIDGeneration tests the vsock CID generation logic
136+
func TestVsockCIDGeneration(t *testing.T) {
137+
testCases := []struct {
138+
id string
139+
expectedMin int64
140+
expectedMax int64
141+
}{
142+
{"abc123", 3, 4294967294},
143+
{"xyz789", 3, 4294967294},
144+
{"test-id-here", 3, 4294967294},
145+
{"a", 3, 4294967294},
146+
{"verylonginstanceid12345", 3, 4294967294},
147+
}
148+
149+
for _, tc := range testCases {
150+
t.Run(tc.id, func(t *testing.T) {
151+
cid := generateVsockCID(tc.id)
152+
require.GreaterOrEqual(t, cid, tc.expectedMin, "CID must be >= 3")
153+
require.LessOrEqual(t, cid, tc.expectedMax, "CID must be < 2^32-1")
154+
})
155+
}
156+
157+
// Test consistency - same ID should always produce same CID
158+
cid1 := generateVsockCID("consistent-test")
159+
cid2 := generateVsockCID("consistent-test")
160+
require.Equal(t, cid1, cid2, "Same instance ID should produce same CID")
161+
}
162+
163+
// generateVsockCID is re-declared here for testing
164+
func generateVsockCID(instanceID string) int64 {
165+
idPrefix := instanceID
166+
if len(idPrefix) > 8 {
167+
idPrefix = idPrefix[:8]
168+
}
169+
170+
var sum int64
171+
for _, c := range idPrefix {
172+
sum = sum*37 + int64(c)
173+
}
174+
175+
return (sum % 4294967292) + 3
176+
}
177+

cmd/api/api/instances.go

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -274,6 +274,17 @@ func (s *ApiService) DetachVolume(ctx context.Context, request oapi.DetachVolume
274274
}, nil
275275
}
276276

277+
// ExecInstance is a stub for the strict handler - actual exec uses ExecHandler
278+
func (s *ApiService) ExecInstance(ctx context.Context, request oapi.ExecInstanceRequestObject) (oapi.ExecInstanceResponseObject, error) {
279+
// This method exists to satisfy the StrictServerInterface
280+
// Actual exec functionality is handled by ExecHandler which uses HTTP hijacking
281+
// This should never be called since we register the custom route first
282+
return oapi.ExecInstance500JSONResponse{
283+
Code: "internal_error",
284+
Message: "use custom exec endpoint",
285+
}, nil
286+
}
287+
277288
// instanceToOAPI converts domain Instance to OAPI Instance
278289
func instanceToOAPI(inst instances.Instance) oapi.Instance {
279290
// Format sizes as human-readable strings with best precision

cmd/api/main.go

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -91,6 +91,9 @@ func run() error {
9191
}
9292
r.Use(nethttpmiddleware.OapiRequestValidatorWithOptions(spec, validatorOptions))
9393

94+
// Custom exec endpoint (uses HTTP hijacking for bidirectional streaming)
95+
r.Post("/instances/{id}/exec", app.ApiService.ExecHandler)
96+
9497
// Setup strict handler
9598
strictHandler := oapi.NewStrictHandler(app.ApiService, nil)
9699

go.mod

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -12,6 +12,7 @@ require (
1212
github.com/google/go-containerregistry v0.20.6
1313
github.com/google/wire v0.7.0
1414
github.com/joho/godotenv v1.5.1
15+
github.com/mdlayher/vsock v1.2.1
1516
github.com/nrednav/cuid2 v1.1.0
1617
github.com/oapi-codegen/nethttp-middleware v1.1.2
1718
github.com/oapi-codegen/runtime v1.1.2
@@ -44,6 +45,7 @@ require (
4445
github.com/klauspost/compress v1.18.0 // indirect
4546
github.com/klauspost/pgzip v1.2.6 // indirect
4647
github.com/mailru/easyjson v0.7.7 // indirect
48+
github.com/mdlayher/socket v0.5.1 // indirect
4749
github.com/mitchellh/go-homedir v1.1.0 // indirect
4850
github.com/moby/sys/user v0.4.0 // indirect
4951
github.com/moby/sys/userns v0.1.0 // indirect
@@ -63,6 +65,7 @@ require (
6365
github.com/vbatts/tar-split v0.12.1 // indirect
6466
github.com/woodsbury/decimal128 v1.3.0 // indirect
6567
golang.org/x/crypto v0.41.0 // indirect
68+
golang.org/x/net v0.42.0 // indirect
6669
golang.org/x/sys v0.37.0 // indirect
6770
google.golang.org/protobuf v1.36.10 // indirect
6871
gopkg.in/yaml.v2 v2.4.0 // indirect

go.sum

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -91,6 +91,10 @@ github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcncea
9191
github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
9292
github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
9393
github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
94+
github.com/mdlayher/socket v0.5.1 h1:VZaqt6RkGkt2OE9l3GcC6nZkqD3xKeQLyfleW/uBcos=
95+
github.com/mdlayher/socket v0.5.1/go.mod h1:TjPLHI1UgwEv5J1B5q0zTZq12A/6H7nKmtTanQE37IQ=
96+
github.com/mdlayher/vsock v1.2.1 h1:pC1mTJTvjo1r9n9fbm7S1j04rCgCzhCOS5DY0zqHlnQ=
97+
github.com/mdlayher/vsock v1.2.1/go.mod h1:NRfCibel++DgeMD8z/hP+PPTjlNJsdPOmxcnENvE+SE=
9498
github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
9599
github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
96100
github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
@@ -174,6 +178,8 @@ golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sU
174178
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
175179
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
176180
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
181+
golang.org/x/net v0.42.0 h1:jzkYrhi3YQWD6MLBJcsklgQsoAcw89EcZbJw8Z614hs=
182+
golang.org/x/net v0.42.0/go.mod h1:FF1RA5d3u7nAYA4z2TkclSCKh68eSXtiFwcWQpPXdt8=
177183
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
178184
golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
179185
golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=

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