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refactor: remove Go envd module, update host agent for Rust envd

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The Go envd guest agent (`envd/`) is fully replaced by the Rust
implementation (`envd-rs/`). This commit removes the Go module and
updates all references across the codebase.

Makefile: remove ENVD_DIR, VERSION_ENVD, build-envd-go, dev-envd-go,
and Go envd from proto/fmt/vet/tidy/clean targets. Add static-link
verification to build-envd.

Host agent: rewrite snapshot quiesce comments that referenced Go GC
and page allocator corruption — no longer applicable with Rust envd.
Tighten envdclient to expect HTTP 200 (not 204) from health and file
upload endpoints, and require JSON version response from FetchVersion.

Remove NOTICE (no e2b-derived code remains). Update CLAUDE.md and
README.md to reflect Rust envd architecture.
This commit is contained in:
Rafeed M. Bhuiyan
2026-05-03 03:12:25 +06:00
parent 0b53d34417
commit 1143acd37a
109 changed files with 49 additions and 20665 deletions
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19
internal/sandbox/manager.go
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@ -95,11 +95,9 @@ type snapshotParent struct {
}
// maxDiffGenerations caps how many incremental diff generations we chain
// before falling back to a Full snapshot to collapse the chain. Firecracker
// snapshot/restore of a Go process (envd) accumulates runtime memory state
// drift; empirically, ~10 diff-based cycles corrupt the Go page allocator.
// A Full snapshot resets the generation counter and produces a clean base,
// preventing the crash.
// before falling back to a Full snapshot to collapse the chain. Long diff
// chains increase restore latency and snapshot directory size; a periodic
// Full snapshot resets the counter and produces a clean base.
const maxDiffGenerations = 8
// buildMetadata constructs the metadata map with version information.
@ -382,8 +380,7 @@ func (m *Manager) Pause(ctx context.Context, sandboxID string) error {
m.stopSampler(sb)
// Step 0: Drain in-flight proxy connections before freezing vCPUs.
// This prevents Go runtime corruption inside the guest caused by stale
// TCP state from connections that were alive when the VM was snapshotted.
// Stale TCP state from mid-flight connections causes issues on restore.
sb.connTracker.Drain(2 * time.Second)
slog.Debug("pause: proxy connections drained", "id", sandboxID)
@ -393,10 +390,8 @@ func (m *Manager) Pause(ctx context.Context, sandboxID string) error {
sb.client.CloseIdleConnections()
slog.Debug("pause: envd client idle connections closed", "id", sandboxID)
// Step 0c: Signal envd to quiesce continuous goroutines (port scanner,
// forwarder), close idle HTTP connections, and run GC before freezing
// vCPUs. This prevents Go runtime page allocator corruption ("bad
// summary data") on snapshot restore. The 3s timeout also gives time
// Step 0c: Signal envd to quiesce (stop port scanner/forwarder, mark
// connections for post-restore cleanup). The 3s timeout also gives time
// for the FINs from Step 0b to be processed by the guest kernel.
// Best-effort: a failure is logged but does not abort the pause.
func() {
@ -405,7 +400,7 @@ func (m *Manager) Pause(ctx context.Context, sandboxID string) error {
if err := sb.client.PrepareSnapshot(prepCtx); err != nil {
slog.Warn("pause: pre-snapshot quiesce failed (best-effort)", "id", sandboxID, "error", err)
} else {
slog.Debug("pause: envd goroutines quiesced", "id", sandboxID)
slog.Debug("pause: envd quiesced", "id", sandboxID)
}
}()