v0.42.0: agentic controller update — in-guest image swap + rollback (Phase 1)

New local-API POST /controller/swap (+ GET /controller/swap/status), withGuest-
scoped: the agent records the previous image, confirms the target is present,
rewrites /etc/felhom-controller-image, restarts felhom-controller-bootstrap.service,
verifies the new controller is healthy (docker inspect, <=90s), and ROLLS BACK to
the previous image if not. Single-flight per guest; strict image-ref validation;
crash-safety state file. GuestBinder.GuestExec is the pct-exec seam.
--selftest=controller-swap exercises it directly.

Tests: happy/rollback-on-unhealthy(+red-proof)/image-absent/no-healthcheck/
bad-image-400/single-flight-409.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TtXesNa2LGbMmE4DNL6SE7
This commit is contained in:
2026-06-26 21:26:12 +02:00
parent 4725396c81
commit 6f14b66191
6 changed files with 672 additions and 6 deletions
+26
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@@ -3,6 +3,32 @@
All notable changes to **felhom-agent** are recorded here. Update on every code
change that gets pushed.
## v0.42.0 — agentic controller update: in-guest image swap + rollback (Phase 1) (2026-06-26)
The host agent now owns the in-guest controller image **swap** — the new-architecture replacement for
the controller's dead in-container `docker compose` self-update. The controller pre-pulls the target
image (shared docker socket, its own registry token) then asks the agent to swap; the agent — external
to the controller container, so it survives the controller being killed mid-swap — does the rest and
**rolls back** if the new controller doesn't come up healthy.
- **New local-API routes** (`internal/localapi/controllerswap.go`, token-scoped via `withGuest`):
- `POST /controller/swap {image}`**202** `{status:"swapping", previous_image, target_image}`, then
async: record previous (crash-safety state file `/var/lib/felhom-agent/controller-swap-<vmid>.json`)
→ confirm the target image is present in the guest (else abort, **no swap**) → write
`/etc/felhom-controller-image``systemctl restart felhom-controller-bootstrap.service` → poll the
new controller to **healthy** (`docker inspect`, ≤90s) → **roll back** to the previous image + restart
if it doesn't (the guest is never left without a controller). Single-flight per guest (409 if busy).
Image ref is strict-validated (`gitea.dooplex.hu/admin/felhom-controller:<semver>`) before any action.
- `GET /controller/swap/status``{state: swapping|done|failed, current, previous, target, error}`.
- **`GuestBinder.GuestExec`** (`internal/localapi/guestbind.go`): the one `pct exec` seam the swap
composes over (cat/inspect/write/restart), reusing the fenced root runner.
- **`--selftest=controller-swap -vmid -image <ref>`**: exercise the primitive directly (the target image
must already be pulled in the guest).
- Wired `ControllerSwap: guestBinder` into the local-API server (`cmd/felhom-agent/main.go`).
- Tests (`controllerswap_test.go`): happy swap, **rollback-on-unhealthy** (+ companion red-proof:
dropping the rollback leaves the guest on the bad image and fails the test), image-absent no-swap,
no-healthcheck-running, bad-image 400, single-flight 409.
## v0.41.0 — provisioned customer guests auto-start after a host reboot (`onboot:1`) (2026-06-24)
**F3 fix.** The provision back-half now sets **`onboot:1`** on the customer guest, so after a host
+42 -1
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@@ -44,7 +44,7 @@ import (
// version is the agent version. Overridable at build time with
// -ldflags "-X main.version=<v>"; defaults to the in-repo CHANGELOG version.
var version = "0.41.0"
var version = "0.42.0"
// runGuestHook is the PVE pre-start hook body (`felhom-agent guest-hook <vmid> <phase>`). On the
// pre-start phase it creates placeholder dirs for any absent bind-mount source so the guest always boots
@@ -104,6 +104,7 @@ func main() {
keyDest string
idBundlePath string
directivePath string
swapImage string
showVersion bool
)
flag.StringVar(&cfgPath, "config", envOr("FELHOM_AGENT_CONFIG", "/etc/felhom-agent/agent.json"), "path to the agent config file (JSON)")
@@ -130,6 +131,7 @@ func main() {
flag.StringVar(&directivePath, "directive", "", "for --selftest=escrow-create: a JSON file with the non-secret DR directive (pbs repo/ns, expected fingerprint, tunnel id)")
flag.StringVar(&custID, "customer-id", "", "for --selftest=provision: the customer id — the hub config-pull target, baked into the guest's bootstrap")
flag.StringVar(&hubPassword, "hub-password", "", "for --selftest=provision: the customer's hub RETRIEVAL PASSPHRASE (SECRET) — baked into bootstrap.json so the controller pulls its config (and the customer-scoped hub key) from the hub. The customer must already exist in the hub.")
flag.StringVar(&swapImage, "image", "", "for --selftest=controller-swap: the target controller image ref (gitea.dooplex.hu/admin/felhom-controller:<semver>) — must already be pulled in the guest")
flag.StringVar(&custDomain, "customer-domain", "", "for --selftest=provision: customer domain (accepted; used by bring-up only — NOT baked into v2 bootstrap, the hub provides it)")
flag.StringVar(&custName, "customer-name", "", "for --selftest=provision: customer display name (accepted; NOT baked into v2 bootstrap)")
flag.StringVar(&custEmail, "customer-email", "", "for --selftest=provision: customer email (accepted; NOT baked into v2 bootstrap)")
@@ -189,6 +191,8 @@ func main() {
os.Exit(runSelftestEscrowConsume(context.Background(), logger, blobPath, expectedFP, keyDest))
case "identity-consume":
os.Exit(runSelftestIdentityConsume(context.Background(), logger, blobPath, keyDest))
case "controller-swap":
os.Exit(runSelftestControllerSwap(context.Background(), cfg, logger, vmid, swapImage))
}
}
@@ -713,6 +717,7 @@ func buildLocalAPIServer(cfg config.Config, px *proxmox.Client, store *backup.St
DiskGate: storageGateAdapter{gate: gate, hostID: cfg.Hub.HostID},
Guests2: px,
GuestAttach: guestBinder, // slice 10 P2: bind enrolled data drives into the guest
ControllerSwap: guestBinder, // Phase 1: agentic controller update — in-guest image swap
Intent: intent, // slice 10 P3: record enroll/eject intent for self-heal
GuestBinds: guestBinds, // F9: per-guest bind record for the startup re-assert
FormatJobs: formatJobs, // F20-BUG3: detached-format job record + restart recovery
@@ -798,6 +803,42 @@ func buildVerifier(cfg config.Config, logger *slog.Logger) (reconcile.OpVerifier
return authz.New(signers, store, cfg.Hub.HostID), store, nil
}
// runSelftestControllerSwap exercises the agentic controller-update swap primitive directly (Phase 1):
// it swaps guest -vmid's controller to -image, verifies it comes up healthy, and ROLLS BACK if not.
// The target image must already be pulled in the guest (the controller pre-pulls it in the real flow).
func runSelftestControllerSwap(ctx context.Context, cfg config.Config, logger *slog.Logger, vmid int, image string) int {
if vmid <= 0 {
fmt.Fprintln(os.Stderr, "selftest=controller-swap: -vmid is required")
return 1
}
if !localapi.ValidControllerImage(image) {
fmt.Fprintln(os.Stderr, "selftest=controller-swap: -image must be gitea.dooplex.hu/admin/felhom-controller:<semver>")
return 1
}
gaMode := proxmox.RunnerMode(cfg.Privileged.Mode)
if gaMode == "" {
gaMode = proxmox.RunnerSudo
}
binder := localapi.NewGuestBinder(&proxmox.ExecRunner{Mode: gaMode, SudoPath: cfg.Privileged.SudoPath}, logger)
swapper := localapi.NewControllerSwapper(binder, "/var/lib/felhom-agent", logger)
cur, _ := swapper.CurrentImage(ctx, vmid)
fmt.Printf("=== felhom-agent %s selftest=controller-swap (vmid=%d) ===\n", version, vmid)
fmt.Printf(" current image: %s\n target image: %s\n", cur, image)
st := swapper.Swap(ctx, vmid, image)
fmt.Printf(" --- result ---\n state=%s current=%s previous=%s\n", st.State, st.Current, st.Previous)
if st.Error != "" {
fmt.Printf(" error: %s\n", st.Error)
}
if st.State == "done" {
fmt.Println("=== selftest=controller-swap OK (swapped + healthy) ===")
return 0
}
fmt.Println("=== selftest=controller-swap FAILED (rolled back if previous existed) ===")
return 1
}
// runSelftestHub validates hub config, does ONE collect + report, and prints the
// report it would send plus the envelope it got back.
func runSelftestHub(ctx context.Context, cfg config.Config, logger *slog.Logger) int {
+354
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@@ -0,0 +1,354 @@
package localapi
import (
"context"
"encoding/json"
"fmt"
"log/slog"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"time"
)
// ---- agentic controller update (Phase 1): the agent owns the in-guest controller image SWAP -------
//
// The in-guest controller pre-PULLS the target image (its own registry token, shared docker socket),
// then asks the agent to swap. The agent — external to the controller container, so it survives the
// controller being killed mid-swap — rewrites /etc/felhom-controller-image and restarts the golden's
// felhom-controller-bootstrap.service (docker rm -f + docker run), verifies the new controller comes
// up healthy, and ROLLS BACK to the previous image if it does not. Latest-only is enforced caller-side
// (the controller resolves latest via queryRegistry); here we only accept a strict controller image ref.
const (
controllerImageFile = "/etc/felhom-controller-image"
bootstrapUnit = "felhom-controller-bootstrap.service"
controllerContainer = "felhom-controller"
)
// controllerImageRe is the fail-safe gate: ONLY our controller repo + a 3-part semver tag may be run.
// A malformed/hostile body can't make the agent docker-run an arbitrary image.
var controllerImageRe = regexp.MustCompile(`^gitea\.dooplex\.hu/admin/felhom-controller:[0-9]+\.[0-9]+\.[0-9]+$`)
// ValidControllerImage reports whether ref is an acceptable swap target (strict).
func ValidControllerImage(ref string) bool { return controllerImageRe.MatchString(ref) }
// GuestExecutor runs a command inside a guest (pct exec) and returns stdout. Satisfied by *GuestBinder;
// faked in tests. The single seam the swap composes over (no hand-rolled pct).
type GuestExecutor interface {
GuestExec(ctx context.Context, vmid int, args ...string) (string, error)
}
// ControllerSwapState is the durable record of a swap (crash-safety + status). Written before the swap
// so a mid-swap agent crash leaves the previous image recoverable.
type ControllerSwapState struct {
VMID int `json:"vmid"`
State string `json:"state"` // swapping | done | failed
Previous string `json:"previous_image"`
Target string `json:"target_image"`
Current string `json:"current_image"` // image the file currently names
Error string `json:"error,omitempty"`
UpdatedAt string `json:"updated_at"`
}
// ControllerSwapper performs the swap over a GuestExecutor. Stateless except the on-disk state file and
// the (test-tunable) verify timing.
type ControllerSwapper struct {
exec GuestExecutor
stateDir string
logger *slog.Logger
verifyTimeout time.Duration
verifyInterval time.Duration
}
// NewControllerSwapper builds a swapper. stateDir holds controller-swap-<vmid>.json (default
// /var/lib/felhom-agent when empty).
func NewControllerSwapper(exec GuestExecutor, stateDir string, logger *slog.Logger) *ControllerSwapper {
if stateDir == "" {
stateDir = "/var/lib/felhom-agent"
}
if logger == nil {
logger = slog.Default()
}
return &ControllerSwapper{
exec: exec,
stateDir: stateDir,
logger: logger,
verifyTimeout: 90 * time.Second,
verifyInterval: 3 * time.Second,
}
}
func (c *ControllerSwapper) statePath(vmid int) string {
return filepath.Join(c.stateDir, fmt.Sprintf("controller-swap-%d.json", vmid))
}
func (c *ControllerSwapper) saveState(st *ControllerSwapState) {
st.UpdatedAt = time.Now().UTC().Format(time.RFC3339)
if err := os.MkdirAll(c.stateDir, 0o755); err != nil {
c.logger.Error("controller-swap: mkdir state dir", "err", err)
return
}
b, _ := json.MarshalIndent(st, "", " ")
tmp := c.statePath(st.VMID) + ".tmp"
if err := os.WriteFile(tmp, b, 0o600); err != nil {
c.logger.Error("controller-swap: write state", "err", err)
return
}
if err := os.Rename(tmp, c.statePath(st.VMID)); err != nil {
c.logger.Error("controller-swap: rename state", "err", err)
}
}
// LoadState returns the recorded swap state for a guest, or nil if none.
func (c *ControllerSwapper) LoadState(vmid int) (*ControllerSwapState, error) {
b, err := os.ReadFile(c.statePath(vmid))
if os.IsNotExist(err) {
return nil, nil
}
if err != nil {
return nil, err
}
var st ControllerSwapState
if err := json.Unmarshal(b, &st); err != nil {
return nil, err
}
return &st, nil
}
// CurrentImage reads /etc/felhom-controller-image in the guest.
func (c *ControllerSwapper) CurrentImage(ctx context.Context, vmid int) (string, error) {
out, err := c.exec.GuestExec(ctx, vmid, "cat", controllerImageFile)
if err != nil {
return "", err
}
return strings.TrimSpace(out), nil
}
func (c *ControllerSwapper) imagePresent(ctx context.Context, vmid int, image string) bool {
_, err := c.exec.GuestExec(ctx, vmid, "docker", "image", "inspect", image)
return err == nil
}
func (c *ControllerSwapper) writeImage(ctx context.Context, vmid int, image string) error {
// image is strict-validated (controllerImageRe) before we ever get here, so this single-quoted
// interpolation cannot smuggle shell metacharacters.
cmd := fmt.Sprintf("printf '%%s\\n' '%s' > %s", image, controllerImageFile)
_, err := c.exec.GuestExec(ctx, vmid, "bash", "-c", cmd)
return err
}
func (c *ControllerSwapper) restartBootstrap(ctx context.Context, vmid int) error {
_, err := c.exec.GuestExec(ctx, vmid, "systemctl", "restart", bootstrapUnit)
return err
}
// controllerHealthy reports running + (healthy or no healthcheck) + the running image == want.
// Returns (ok, stillStarting): stillStarting=true means keep polling.
func (c *ControllerSwapper) controllerHealthy(ctx context.Context, vmid int, want string) (ok, starting bool) {
out, err := c.exec.GuestExec(ctx, vmid, "docker", "inspect", "-f",
"{{.State.Running}}|{{if .State.Health}}{{.State.Health.Status}}{{else}}none{{end}}|{{.Config.Image}}", controllerContainer)
if err != nil {
return false, true // container not there yet (rm -f window) → keep polling
}
f := strings.SplitN(strings.TrimSpace(out), "|", 3)
if len(f) != 3 {
return false, true
}
running, health, image := f[0] == "true", f[1], f[2]
if !running {
return false, true
}
if image != want {
return false, true // bootstrap may not have re-run yet
}
switch health {
case "healthy", "none":
return true, false
case "starting":
return false, true
default: // unhealthy
return false, true
}
}
func (c *ControllerSwapper) verify(ctx context.Context, vmid int, want string) bool {
deadline := time.Now().Add(c.verifyTimeout)
for {
if ok, _ := c.controllerHealthy(ctx, vmid, want); ok {
return true
}
if time.Now().After(deadline) || ctx.Err() != nil {
return false
}
select {
case <-ctx.Done():
return false
case <-time.After(c.verifyInterval):
}
}
}
// Swap performs the full swap+verify+rollback. Returns the final state. It is synchronous (the HTTP
// handler runs it in a goroutine after a 202). Idempotency/single-flight is the caller's.
func (c *ControllerSwapper) Swap(ctx context.Context, vmid int, target string) *ControllerSwapState {
st := &ControllerSwapState{VMID: vmid, State: "swapping", Target: target}
prev, err := c.CurrentImage(ctx, vmid)
if err != nil {
c.logger.Warn("controller-swap: could not read current image (continuing)", "vmid", vmid, "err", err)
}
st.Previous, st.Current = prev, prev
c.saveState(st) // crash-safety: previous recorded BEFORE any mutation
// The controller pre-pulled the image; refuse to swap to an absent image (would brick the guest).
if !c.imagePresent(ctx, vmid, target) {
st.State = "failed"
st.Error = "target image not present in guest (controller did not pre-pull it)"
c.saveState(st)
c.logger.Error("controller-swap: target image absent — no swap", "vmid", vmid, "target", target)
return st
}
if err := c.writeImage(ctx, vmid, target); err != nil {
st.State = "failed"
st.Error = "write image file: " + err.Error()
c.saveState(st)
return st
}
st.Current = target
c.saveState(st)
c.logger.Info("controller-swap: image file written, restarting bootstrap", "vmid", vmid, "target", target)
if err := c.restartBootstrap(ctx, vmid); err != nil {
c.logger.Error("controller-swap: bootstrap restart failed — rolling back", "vmid", vmid, "err", err)
return c.rollback(ctx, st, "bootstrap restart failed: "+err.Error())
}
if c.verify(ctx, vmid, target) {
st.State = "done"
st.Error = ""
c.saveState(st)
c.logger.Info("controller-swap: new controller healthy", "vmid", vmid, "target", target)
return st
}
return c.rollback(ctx, st, "new controller did not become healthy within timeout")
}
// rollback reverts /etc/felhom-controller-image to the previous image and restarts the unit so the
// guest is NEVER left with no controller. Best-effort verify of the previous coming back.
func (c *ControllerSwapper) rollback(ctx context.Context, st *ControllerSwapState, reason string) *ControllerSwapState {
st.State = "failed"
st.Error = reason
if st.Previous == "" {
c.logger.Error("controller-swap: cannot roll back — no previous image recorded", "vmid", st.VMID)
c.saveState(st)
return st
}
c.logger.Warn("controller-swap: rolling back", "vmid", st.VMID, "previous", st.Previous, "reason", reason)
if err := c.writeImage(ctx, st.VMID, st.Previous); err != nil {
st.Error = reason + "; ALSO rollback write failed: " + err.Error()
c.saveState(st)
return st
}
st.Current = st.Previous
if err := c.restartBootstrap(ctx, st.VMID); err != nil {
st.Error = reason + "; ALSO rollback restart failed: " + err.Error()
c.saveState(st)
return st
}
if c.verify(ctx, st.VMID, st.Previous) {
c.logger.Info("controller-swap: rolled back to previous, controller healthy", "vmid", st.VMID, "previous", st.Previous)
} else {
c.logger.Error("controller-swap: rolled back but previous controller not confirmed healthy", "vmid", st.VMID)
}
c.saveState(st)
return st
}
// ---- HTTP handlers ----------------------------------------------------------------------------------
// handleControllerSwap is POST /controller/swap {image}. Auth+scoping via withGuest. Responds 202 then
// swaps async (single-flight per guest). The controller will be killed by the swap, so the agent owns
// the rest (verify + rollback) independently.
func (s *Server) handleControllerSwap(w http.ResponseWriter, r *http.Request, vmid int) {
if s.swap == nil {
writeErr(w, http.StatusServiceUnavailable, "controller-swap not configured on this host")
return
}
var req struct {
Image string `json:"image"`
}
if !decodeBody(w, r, &req) {
return
}
target := strings.TrimSpace(req.Image)
if !ValidControllerImage(target) {
writeErr(w, http.StatusBadRequest, "invalid controller image ref (must be gitea.dooplex.hu/admin/felhom-controller:<semver>)")
return
}
s.swapMu.Lock()
if s.swapInFlight[vmid] {
s.swapMu.Unlock()
writeErr(w, http.StatusConflict, "a controller swap is already in progress for this guest")
return
}
s.swapInFlight[vmid] = true
s.swapMu.Unlock()
// Read the previous image for the immediate response (best-effort, short ctx).
pctx, pcancel := context.WithTimeout(context.Background(), 10*time.Second)
prev, _ := s.swap.CurrentImage(pctx, vmid)
pcancel()
base := s.baseCtx
if base == nil {
base = context.Background()
}
go func() {
defer func() {
s.swapMu.Lock()
delete(s.swapInFlight, vmid)
s.swapMu.Unlock()
}()
ctx, cancel := context.WithTimeout(base, 5*time.Minute)
defer cancel()
s.swap.Swap(ctx, vmid, target)
}()
s.logger.Warn("local-api: controller swap requested", "vmid", vmid, "target", target, "previous", prev)
writeStatus(w, http.StatusAccepted, true, map[string]any{
"status": "swapping", "previous_image": prev, "target_image": target,
}, "")
}
// handleControllerSwapStatus is GET /controller/swap/status — the swap outcome for the (new) controller
// and the test to read.
func (s *Server) handleControllerSwapStatus(w http.ResponseWriter, r *http.Request, vmid int) {
if s.swap == nil {
writeErr(w, http.StatusServiceUnavailable, "controller-swap not configured on this host")
return
}
s.swapMu.Lock()
inflight := s.swapInFlight[vmid]
s.swapMu.Unlock()
st, err := s.swap.LoadState(vmid)
if err != nil {
writeErr(w, http.StatusInternalServerError, "read swap state: "+err.Error())
return
}
if st == nil {
writeStatus(w, http.StatusOK, true, map[string]any{"state": "none", "in_flight": inflight}, "")
return
}
writeStatus(w, http.StatusOK, true, map[string]any{
"state": st.State,
"in_flight": inflight,
"current": st.Current,
"previous": st.Previous,
"target": st.Target,
"error": st.Error,
}, "")
}
+213
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@@ -0,0 +1,213 @@
package localapi
import (
"context"
"fmt"
"io"
"log/slog"
"net/http/httptest"
"regexp"
"strings"
"sync"
"testing"
"time"
)
func discardLogger() *slog.Logger { return slog.New(slog.NewTextHandler(io.Discard, nil)) }
// fakeGuestExec simulates `pct exec` into a guest for the swap primitive. It models the image file,
// which images are present (pulled), which come up healthy, and the running container's image.
type fakeGuestExec struct {
mu sync.Mutex
calls [][]string
imageFile string // /etc/felhom-controller-image content
present map[string]bool // images pulled into the guest
good map[string]bool // images that report healthy when running
containerImg string // image the running container currently has
failRestart bool
noHealthBlock bool // if set, .State.Health is absent ("none")
}
var writeImgRe = regexp.MustCompile(`'([^']+)' >`)
func (f *fakeGuestExec) GuestExec(_ context.Context, _ int, args ...string) (string, error) {
f.mu.Lock()
defer f.mu.Unlock()
f.calls = append(f.calls, args)
switch {
case len(args) >= 2 && args[0] == "cat" && args[1] == controllerImageFile:
return f.imageFile + "\n", nil
case len(args) >= 4 && args[0] == "docker" && args[1] == "image" && args[2] == "inspect":
if f.present[args[3]] {
return args[3], nil
}
return "", fmt.Errorf("no such image: %s", args[3])
case len(args) >= 3 && args[0] == "bash" && args[1] == "-c":
m := writeImgRe.FindStringSubmatch(args[2])
if m == nil {
return "", fmt.Errorf("fake: unparseable write cmd %q", args[2])
}
f.imageFile = m[1]
return "", nil
case len(args) >= 3 && args[0] == "systemctl" && args[1] == "restart":
if f.failRestart {
return "", fmt.Errorf("fake: systemctl restart failed")
}
f.containerImg = f.imageFile // bootstrap re-ran: container now runs the file's image
return "", nil
case len(args) >= 2 && args[0] == "docker" && args[1] == "inspect":
if f.containerImg == "" {
return "", fmt.Errorf("no such container")
}
health := "healthy"
if f.noHealthBlock {
health = "none"
} else if !f.good[f.containerImg] {
health = "unhealthy"
}
return fmt.Sprintf("true|%s|%s", health, f.containerImg), nil
}
return "", fmt.Errorf("fake: unexpected exec %v", args)
}
func (f *fakeGuestExec) wrote(image string) bool {
f.mu.Lock()
defer f.mu.Unlock()
for _, c := range f.calls {
if len(c) >= 3 && c[0] == "bash" && strings.Contains(c[2], "'"+image+"'") {
return true
}
}
return false
}
func newTestSwapper(t *testing.T, fe *fakeGuestExec) *ControllerSwapper {
t.Helper()
s := NewControllerSwapper(fe, t.TempDir(), nil)
s.verifyTimeout = 200 * time.Millisecond
s.verifyInterval = 5 * time.Millisecond
return s
}
const (
prevImg = "gitea.dooplex.hu/admin/felhom-controller:0.77.0"
newImg = "gitea.dooplex.hu/admin/felhom-controller:0.84.0"
)
func TestControllerSwap_Happy(t *testing.T) {
fe := &fakeGuestExec{
imageFile: prevImg,
present: map[string]bool{newImg: true},
good: map[string]bool{newImg: true, prevImg: true},
}
s := newTestSwapper(t, fe)
st := s.Swap(context.Background(), 9201, newImg)
if st.State != "done" {
t.Fatalf("state = %q (err=%q), want done", st.State, st.Error)
}
if fe.imageFile != newImg {
t.Errorf("image file = %q, want %q", fe.imageFile, newImg)
}
if st.Previous != prevImg {
t.Errorf("previous = %q, want %q", st.Previous, prevImg)
}
if !fe.wrote(newImg) {
t.Errorf("expected the new image to be written")
}
// state file persisted
got, _ := s.LoadState(9201)
if got == nil || got.State != "done" {
t.Errorf("state file = %+v, want done", got)
}
}
// The load-bearing failure path: an unhealthy target must roll back to the previous image.
func TestControllerSwap_RollbackOnUnhealthy(t *testing.T) {
fe := &fakeGuestExec{
imageFile: prevImg,
present: map[string]bool{newImg: true},
good: map[string]bool{prevImg: true}, // newImg present but NEVER healthy
}
s := newTestSwapper(t, fe)
st := s.Swap(context.Background(), 9201, newImg)
if st.State != "failed" {
t.Fatalf("state = %q, want failed", st.State)
}
if fe.imageFile != prevImg {
t.Errorf("image file = %q after rollback, want previous %q (guest left on bad image!)", fe.imageFile, prevImg)
}
if fe.containerImg != prevImg {
t.Errorf("running container = %q after rollback, want %q", fe.containerImg, prevImg)
}
// restart called at least twice (swap + rollback)
restarts := 0
for _, c := range fe.calls {
if len(c) >= 2 && c[0] == "systemctl" && c[1] == "restart" {
restarts++
}
}
if restarts < 2 {
t.Errorf("systemctl restart called %d times, want ≥2 (swap + rollback)", restarts)
}
}
func TestControllerSwap_ImageAbsent_NoSwap(t *testing.T) {
fe := &fakeGuestExec{
imageFile: prevImg,
present: map[string]bool{}, // target NOT pulled
good: map[string]bool{prevImg: true},
}
s := newTestSwapper(t, fe)
st := s.Swap(context.Background(), 9201, newImg)
if st.State != "failed" {
t.Fatalf("state = %q, want failed", st.State)
}
if fe.imageFile != prevImg {
t.Errorf("image file = %q, want unchanged %q (no swap on absent image)", fe.imageFile, prevImg)
}
if fe.wrote(newImg) {
t.Errorf("must NOT write the image file when the target image is absent")
}
}
func TestControllerSwap_HealthyWithNoHealthcheck(t *testing.T) {
fe := &fakeGuestExec{
imageFile: prevImg,
present: map[string]bool{newImg: true},
noHealthBlock: true, // image defines no HEALTHCHECK → running is enough
}
s := newTestSwapper(t, fe)
st := s.Swap(context.Background(), 9201, newImg)
if st.State != "done" {
t.Fatalf("state = %q, want done (running + no healthcheck)", st.State)
}
}
func TestControllerSwapHandler_BadImage(t *testing.T) {
fe := &fakeGuestExec{present: map[string]bool{}}
s := &Server{swap: newTestSwapper(t, fe), swapInFlight: map[int]bool{}, logger: discardLogger()}
body := `{"image":"docker.io/evil/runme:latest"}`
req := httptest.NewRequest("POST", "/controller/swap", strings.NewReader(body))
rr := httptest.NewRecorder()
s.handleControllerSwap(rr, req, 9201)
if rr.Code != 400 {
t.Fatalf("status = %d, want 400 for a non-controller image", rr.Code)
}
if len(fe.calls) != 0 {
t.Errorf("no guest exec should run for a rejected image, got %v", fe.calls)
}
}
func TestControllerSwapHandler_SingleFlight(t *testing.T) {
fe := &fakeGuestExec{present: map[string]bool{}}
s := &Server{swap: newTestSwapper(t, fe), swapInFlight: map[int]bool{9201: true}, logger: discardLogger()}
req := httptest.NewRequest("POST", "/controller/swap", strings.NewReader(`{"image":"`+newImg+`"}`))
rr := httptest.NewRecorder()
s.handleControllerSwap(rr, req, 9201)
if rr.Code != 409 {
t.Fatalf("status = %d, want 409 (swap already in progress)", rr.Code)
}
}
+14
View File
@@ -5,6 +5,7 @@ import (
"fmt"
"log/slog"
"strconv"
"strings"
"sync"
"gitea.dooplex.hu/admin/felhom-agent/internal/proxmox"
@@ -110,3 +111,16 @@ func (b *GuestBinder) run(ctx context.Context, name string, args ...string) erro
}
return nil
}
// GuestExec runs a command INSIDE the guest via `pct exec <vmid> -- <args...>` and returns its stdout.
// It is the single guest-exec seam the controller-swap primitive composes over (cat the image file,
// docker image-inspect, write the file, systemctl restart, docker inspect health) — reusing the same
// fenced root runner as the bind ops rather than hand-rolling pct. The guest must be running.
func (b *GuestBinder) GuestExec(ctx context.Context, vmid int, args ...string) (string, error) {
pctArgs := append([]string{"exec", strconv.Itoa(vmid), "--"}, args...)
out, stderr, err := b.runner.Run(ctx, "pct", pctArgs...)
if err != nil {
return string(out), fmt.Errorf("pct exec %d %v: %w: %s", vmid, args, err, strings.TrimSpace(string(stderr)))
}
return string(out), nil
}
+18
View File
@@ -84,6 +84,11 @@ type Options struct {
// GuestAttach binds an enrolled user-data drive's felhom-data namespace into the guest (slice 10
// P2, Model A). OPTIONAL — when nil, POST /disks/guest-attach reports "not configured".
GuestAttach GuestAttacher
// ControllerSwap runs guest commands (pct exec) for the agentic controller-update swap (Phase 1).
// OPTIONAL — when nil, POST /controller/swap reports "not configured". Satisfied by *GuestBinder.
ControllerSwap GuestExecutor
// ControllerSwapStateDir holds the per-guest swap state file (crash-safety). "" → /var/lib/felhom-agent.
ControllerSwapStateDir string
// Intent records drive enroll/eject intent for the self-heal watchdog (slice 10 P3). OPTIONAL —
// when nil, no intent is recorded (self-heal runs ungated).
Intent IntentRecorder
@@ -178,6 +183,11 @@ type Server struct {
jobsMu sync.Mutex
jobs map[int]*backupJob // per-guest backup job state (slice 8B)
// agentic controller update (Phase 1): the swapper + per-guest single-flight gate.
swap *ControllerSwapper
swapMu sync.Mutex
swapInFlight map[int]bool
baseCtx context.Context // for fire-and-forget backups; set in Run
}
@@ -218,9 +228,13 @@ func NewServer(o Options) (*Server, error) {
hostMetrics: o.HostMetrics,
hostID: o.HostID,
jobs: map[int]*backupJob{},
swapInFlight: map[int]bool{},
}
s.reresolveWipe = s.reresolveDurableForWipe
s.deviceDurableID = storage.DeviceDurableID
if o.ControllerSwap != nil {
s.swap = NewControllerSwapper(o.ControllerSwap, o.ControllerSwapStateDir, o.Logger)
}
return s, nil
}
@@ -248,6 +262,10 @@ func (s *Server) Handler() http.Handler {
mux.HandleFunc("POST /disks/guest-attach", s.withGuest(s.handleDiskGuestAttach))
// Guest reboot (slice 10 P2 activation): user-triggered restart to activate pending drive binds.
mux.HandleFunc("POST /guest/reboot", s.withGuest(s.handleGuestReboot))
// agentic controller update (Phase 1): in-guest image swap + rollback, owned by the agent.
mux.HandleFunc("POST /controller/swap", s.withGuest(s.handleControllerSwap))
mux.HandleFunc("GET /controller/swap/status", s.withGuest(s.handleControllerSwapStatus))
return mux
}