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feat: rewrite envd guest agent in Rust (envd-rs)

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Complete Rust rewrite of the Go envd guest daemon that runs as PID 1
inside Firecracker microVMs. Feature-complete across all 8 phases:

- Health, metrics, and env var endpoints
- Crypto (SHA-256/512, HMAC), auth (secure token, signing), init/snapshot
- Connect RPC via connectrpc + buffa (process + filesystem services)
- File transfer (GET/POST /files) with gzip, multipart, chown, ENOSPC
- Port subsystem (/proc/net/tcp scanner, socat forwarder)
- Cgroup2 manager with noop fallback
- Snapshot/restore lifecycle (conntracker, port subsystem stop/restart)
- SIGTERM graceful shutdown, --cmd initial process spawn
- MMDS metadata polling for Firecracker mode

42 source files, ~4200 LOC, 4.1MB stripped release binary.
Makefile updated: build-envd now targets Rust (musl static),
build-envd-go preserved for Go builds.
This commit is contained in:
Rafeed M. Bhuiyan
2026-05-03 02:47:15 +06:00
parent 3deecbff89
commit 0b53d34417
54 changed files with 7089 additions and 17 deletions
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3
envd-rs/rust-toolchain.toml Normal file
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@ -0,0 +1,3 @@
[toolchain]
channel = "stable"
targets = ["x86_64-unknown-linux-gnu", "x86_64-unknown-linux-musl"]