feat(pipeline): firmware SBOM via tramiton reproducible build (phase 2)

Upgrade the firmware SBOM from analysis-only to a full reproducible build: run
tramiton's NixBackend (`seal_and_build`) over the ingested source to produce a
sealed lock whose libraries are pinned and whose firmware artifact carries a
content hash, then render the SBOM from the lock plus deep binary SCA of any
pre-compiled inputs — the complete bill of materials (toolchain + every fetched
library + the firmware image), mapped into `SbomEntry` rows.

Graceful by design: when no nix backend is available (or the build fails / times
out at 15m), it falls back to the analysis-only components (toolchain +
resolvable libraries), so a nix that can't run in the deployment never breaks a
scan.

Infra: the agent image now installs `nix-portable` (rootless, single binary;
best-effort — a failed download just leaves the analysis-only path). The nix
store lives under `NP_LOCATION=/data/compliance-scanner` — mount a PERSISTENT
volume there in the deployment, otherwise every firmware scan re-fetches
nixpkgs + cross toolchains.

Adds the `tramiton-sbom` dependency.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Cargo.lock

@@ -2103,7 +2103,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -3698,7 +3698,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.60.2",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -4679,7 +4679,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.4.15",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -4692,7 +4692,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys 0.12.1",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -5570,10 +5570,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "82a72c767771b47409d2345987fda8628641887d5466101319899796367354a0"
 dependencies = [
  "fastrand",
- "getrandom 0.3.4",
+ "getrandom 0.4.1",
  "once_cell",
  "rustix 1.1.4",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -6150,8 +6150,8 @@ dependencies = [
 
 [[package]]
 name = "tramiton-core"
-version = "0.4.1"
-source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.1#ae4fc1376279f9edb9882605b20877335e7ba8ba"
+version = "0.4.0"
+source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.0#e3dc1bf7027a2f6d7b1fe43043d6dfa887ce4af3"
 dependencies = [
  "serde",
  "tempfile",
@@ -6162,11 +6162,10 @@ dependencies = [
 
 [[package]]
 name = "tramiton-repro"
-version = "0.4.1"
-source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.1#ae4fc1376279f9edb9882605b20877335e7ba8ba"
+version = "0.4.0"
+source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.0#e3dc1bf7027a2f6d7b1fe43043d6dfa887ce4af3"
 dependencies = [
  "serde",
- "serde_json",
  "sha2",
  "tempfile",
  "thiserror 1.0.69",
@@ -6177,8 +6176,8 @@ dependencies = [
 
 [[package]]
 name = "tramiton-sbom"
-version = "0.4.1"
-source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.1#ae4fc1376279f9edb9882605b20877335e7ba8ba"
+version = "0.4.0"
+source = "git+ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git?tag=v0.4.0#e3dc1bf7027a2f6d7b1fe43043d6dfa887ce4af3"
 dependencies = [
  "object",
  "serde",
@@ -6746,7 +6745,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]

Dockerfile.agent

@@ -13,12 +13,6 @@ RUN --mount=type=secret,id=tramiton_token \
     fi && \
     CARGO_NET_GIT_FETCH_WITH_CLI=true cargo build --release -p compliance-agent
 
-# A throwaway stage that packs a real nix store (store paths + the validity DB)
-# into a compressed bootstrap tarball. Only the tarball is copied into the final
-# image, so we don't carry a raw /nix copy layer.
-FROM nixos/nix:latest AS nixseed
-RUN tar -C / -czf /nix-bootstrap.tar.gz nix
-
 FROM debian:bookworm-slim
 RUN apt-get update && apt-get install -y ca-certificates libssl3 git curl python3 python3-pip npm golang-go php-cli && rm -rf /var/lib/apt/lists/*
 
@@ -46,30 +40,20 @@ RUN pip3 install --break-system-packages semgrep
 # Install ruff for Python linting
 RUN pip3 install --break-system-packages ruff
 
-# Real nix for the tramiton reproducible-build firmware SBOM.
-#
-# nix-portable's proot fallback can't run here: user namespaces are blocked by
-# the container's default seccomp/apparmor profile, and orca exposes no way to
-# relax it. So ship a *real* nix and disable its build sandbox
-# (`sandbox = false`) — a plain gcc/make firmware build needs no user namespace,
-# so it runs fine under the locked-down profile with no proot involved.
-#
-# The store is shipped as a bootstrap tarball and seeded onto /nix at first
-# start (see docker/agent-entrypoint.sh), so a persistent /nix volume survives
-# redeploys. A missing/broken nix just falls back to the analysis-only SBOM.
-COPY --from=nixseed /nix-bootstrap.tar.gz /opt/nix-bootstrap.tar.gz
-ENV PATH="/nix/var/nix/profiles/default/bin:${PATH}"
-RUN mkdir -p /etc/nix && printf '%s\n' \
-      'experimental-features = nix-command flakes' \
-      'sandbox = false' \
-      'build-users-group =' \
-      'substituters = https://cache.nixos.org' \
-      'trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=' \
-      > /etc/nix/nix.conf
+# Install nix-portable (rootless nix) so the firmware-SBOM pipeline can drive a
+# tramiton reproducible build (NixBackend). Best-effort: if the download fails,
+# the agent falls back to analysis-only firmware SBOMs (never breaks a scan).
+# The nix store lives under NP_LOCATION — mount a PERSISTENT volume there in the
+# deployment, else every firmware scan re-fetches nixpkgs + cross toolchains.
+ARG NIX_PORTABLE_VERSION=v012
+RUN curl -fsSL -o /usr/local/bin/nix-portable \
+      "https://github.com/DavHau/nix-portable/releases/download/${NIX_PORTABLE_VERSION}/nix-portable-x86_64" \
+    && chmod +x /usr/local/bin/nix-portable \
+    || { rm -f /usr/local/bin/nix-portable; echo "WARN: nix-portable install skipped; firmware SBOM uses analysis-only fallback"; }
+ENV NP_LOCATION=/data/compliance-scanner
+RUN mkdir -p /data/compliance-scanner
 
 COPY --from=builder /app/target/release/compliance-agent /usr/local/bin/compliance-agent
-COPY docker/agent-entrypoint.sh /usr/local/bin/agent-entrypoint.sh
-RUN chmod +x /usr/local/bin/agent-entrypoint.sh
 
 # Copy documentation for the help chat assistant
 COPY --from=builder /app/README.md /app/README.md
@@ -81,6 +65,5 @@ RUN mkdir -p /data/compliance-scanner/ssh
 
 EXPOSE 3001 3002
 
-# Seeds /nix (fresh volume) from the bootstrap tarball, then runs the agent.
-ENTRYPOINT ["/usr/local/bin/agent-entrypoint.sh"]
+ENTRYPOINT ["compliance-agent"]
 

compliance-agent/Cargo.toml

@@ -14,12 +14,12 @@ compliance-dast = { path = "../compliance-dast" }
 # Same-company IP, used directly (not via CLI) so the whole tramiton suite is
 # available to the onboarding classifier. NOTE: CI must be able to fetch this
 # private repo (see the git-auth step in .gitea/workflows/ci.yml).
-tramiton-core = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.1" }
+tramiton-core = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.0" }
 # tramiton-repro drives the reproducible build (NixBackend seal_and_build) that
 # yields a sealed lock; `libraries_from_inputs` is the analysis-only fallback.
-tramiton-repro = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.1" }
+tramiton-repro = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.0" }
 # tramiton-sbom renders the bill of materials from a sealed lock (+ binary SCA).
-tramiton-sbom = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.1" }
+tramiton-sbom = { git = "ssh://git@gitea.meghsakha.com:22222/sharang/tramiton.git", tag = "v0.4.0" }
 serde = { workspace = true }
 serde_json = { workspace = true }
 tokio = { workspace = true }

docker/agent-entrypoint.sh

@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-# Seed the nix store on first start, then run the agent.
-#
-# The firmware-SBOM pipeline drives a real `nix` build (tramiton NixBackend).
-# The image ships the store as a bootstrap tarball rather than baking /nix, so a
-# persistent /nix volume (mounted empty on first deploy) gets populated once and
-# then survives redeploys. Seeding is best-effort: if it fails, the agent still
-# starts and firmware SBOMs fall back to analysis-only.
-if [ ! -e /nix/store ]; then
-  echo "agent-entrypoint: seeding /nix store from image bootstrap..."
-  mkdir -p /nix
-  if tar -C / -xzf /opt/nix-bootstrap.tar.gz; then
-    echo "agent-entrypoint: /nix store seeded."
-  else
-    echo "agent-entrypoint: WARN nix seed failed; firmware SBOM will use analysis-only fallback."
-  fi
-fi
-
-exec compliance-agent "$@"