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Build SilverMetal Linux ISO (reproducibility-gated) / build-and-verify (push) Failing after 2m20s
Run #4257 cleared sanity-tests entirely (sq-git verification of every submodule signature: ✅; tag/uncommitted relaxation: ✅) and reached 1200_prepare-build-machine, where it died: + sudo systemctl daemon-reload sudo: systemctl: command not found ERROR detected in script!: ././build-steps.d/1200_prepare-build-machine derivative-maker assumes systemd is PID 1 on the build host. Upstream's own container (linux/build/derivative-maker/docker/) runs systemd-as-init via an entrypoint that masks irrelevant units and declares its own. We don't want that surgery for M1.1 — it pulls in cgroup mounts, --cgroupns=host, and a much bigger debugging surface. Shim approach instead: install /usr/local/bin/systemctl that logs the attempt to stderr and exits 0. /usr/local/bin precedes /usr/bin in both default $PATH and sudo's secure_path, so it satisfies any systemctl call regardless of whether the real binary later gets pulled in by a package install. Standard pattern for systemd-aware Debian build scripts in transient containers. Risk if it doesn't suffice: the shim makes daemon-reload / restart / mask calls succeed, but doesn't actually run any service. If a later build step depends on (say) approx actually being up to serve cached debs, we'll see the next failure and decide whether to escalate to real systemd-in-container or skip the relevant build step. Changes: - Dockerfile.builder: add the shim with a brief log line to stderr; comment block documents the trade-off. - build.sh: BUILDER_IMAGE digest re-pinned to sha256:70f160ab…5460 (built natively on 10.0.0.51, shim verified working with `docker run … systemctl daemon-reload` returning 0). Verified: shim emits "systemctl-shim: daemon-reload" to stderr and exits 0. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
SilverMetal OS — Linux
Status: Phase 1 (planning) → moving to milestone 1.1 (reproducible Kicksecure fork build)
🔒 SilverMetal OS product line — we ship the operating system.
The reference SilverMetal flavour. Tier A — full kernel-level hardening, verified boot we control, Debian/Kicksecure-based.
Scope (v1)
See ../docs/roadmap.md Phase 1.
Hardening must-haves
- Kicksecure base (Debian-derived, hardened upstream)
- linux-hardened kernel + KSPP sysctl/build flags
- Secure Boot with our shim/MOK
- TPM2 PCR-bound LUKS2 unlock (Argon2id), full-disk encryption mandatory
- AppArmor strict profiles for browsers, mail, viewers, networked daemons
- GrapheneOS hardened_malloc as system allocator
- bubblewrap + Flatpak primary; firejail for legacy
.deb - nftables default-deny inbound, encrypted DNS, SilverVPN always-on default
- Zero upstream telemetry — verified by integration test
- SilverBrowser default (ungoogled-chromium-rebranded v1)
- SilverVPN integrated from existing
SilverLABS/SilverVPN(Linux client + tunnel service) - SilverSync v1 (Nextcloud-backed, client-side encryption)
- A/B updates with rollback, signed by our keys
- Optional amnesic session mode
Out of scope (v1)
- Atomic / immutable root (v1.1 —
ostreeexperiment) - dm-verity on
/(v1.1) - ARM64 / Apple Silicon (v2)
- Tor-by-default variant (sibling product later)
Directory layout
linux/
├── build/ # live-build pipeline, reproducible-build config
├── kernel/ # config fragments, linux-hardened pinning
├── overlay/ # /etc + /usr/share/silvermetal + skel hardening overlay
├── packages/
│ ├── include.list # what's installed
│ └── exclude.list # what's purged (snap, telemetry, etc.)
├── apparmor/ # custom strict profiles
├── nftables/ # default ruleset
├── installer/ # Calamares branding + hardened defaults
├── update-server/ # signing + repo hosting (infra-as-code)
└── tests/
├── lynis-baseline/
├── kspp-check/
└── telemetry-leak/
Verification gates (must pass before public alpha)
- Two clean builds from same commit → identical SHA256
kconfig-hardened-checkpasses- Lynis hardening score ≥ 90
- 30-min idle telemetry capture: zero packets to MS/Google/Apple/Mozilla/Canonical/Debian/analytics
- TPM tamper test: LUKS correctly falls back to passphrase
- AppArmor: every networked binary confined or documented
- Independent privacy-engineering review
Upstream we depend on
- Kicksecure — fork base
- linux-hardened — kernel patchset
- GrapheneOS hardened_malloc — allocator
- KSPP — kernel config authority
- secureblue — reference for v1.1 immutable design
SilverLABS/SilverVPN— VPN client + tunnel service (existing, integrated)