Archived
beatzaplentyandClaude Sonnet 5
bd8d93d890
sync-host-keys.sh: generates/registers SSH host keys and their .sops.yaml/secrets/*.yaml recipients for flake targets, idempotently. --all, <target>, --remove, --regenerate-all-keys, all with --dry-run (verified zero-side-effect via a sandboxed git-status check across every mode). Only ever touches anchors with a corresponding host-keys/ file -- &admin and any hand-registered real-host anchor are never listed, removed, or regenerated. Supersedes running prepare-host-key.sh one host at a time for any target that already has a flake entry. create-proxmox-resource.sh: builds a lxc-*/proxmox-* target's tarball/disk image and creates it on a real Proxmox node, or reconfigures an existing resource's cores/memory/disk (--modify, always requires typing the VMID back to confirm). Refuses to create a new resource for a VMID that already exists, and refuses to duplicate a host identity that already has a real deployment elsewhere (variables.nix's new deployedTargets, checked by hostName so it also catches cross-platform duplicates) unless --allow-duplicate-host is passed. --dry-run throughout. scripts/env.sh centralizes the Proxmox connection config both scripts (and future ones) share. Also fixes an unrelated gap found along the way: proxmox-* Disko image builds write their .raw file straight into the repo root, and .gitignore never covered it. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01La55Nsss8jZ7ZuzUV9mfot
79 lines
3.1 KiB
Bash
Executable File
79 lines
3.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Generates a new machine's SSH host key by an arbitrary name, before it
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# necessarily has a flake target yet -- prints the .sops.yaml snippet to
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# add by hand. For any host that already has a flake target,
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# scripts/sync-host-keys.sh <target> does this same job plus the
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# .sops.yaml/key_groups registration and re-encryption automatically; use
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# this script only to pre-generate a key ahead of adding the flake target
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# itself.
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#
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# Why a host key is needed at all: sops-nix derives each host's decryption key from
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# its own /etc/ssh/ssh_host_ed25519_key at *activation* time, but that
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# activation runs before systemd would otherwise generate this key on
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# first boot (sshd-keygen is a normal systemd service gated behind
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# multi-user.target; activation scripts run earlier than that). Without
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# pre-seeding, secrets — including the root/nixos login password — fail
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# to decrypt on the machine's very first boot.
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#
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# This script only touches your admin workstation and this repo's
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# .sops.yaml (it never contacts the target machine). Run it, follow the
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# printed next steps, then use the resulting key with the auto-install.sh
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# prompt (see modules/installer/common.nix) when you actually install the
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# new machine.
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set -euo pipefail
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repo_root="$(cd "$(dirname "$0")/.." && pwd)"
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hostname="${1:?usage: scripts/prepare-host-key.sh <hostname>}"
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sops_yaml="${repo_root}/.sops.yaml"
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if [[ ! -f "$sops_yaml" ]]; then
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echo "ERROR: $sops_yaml not found — is this script still under nixos/scripts/?" >&2
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exit 1
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fi
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keydir="${repo_root}/host-keys"
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mkdir -p "$keydir"
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keyfile="${keydir}/${hostname}_ssh_host_ed25519_key"
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if [[ -f "$keyfile" ]]; then
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echo "ERROR: $keyfile already exists. Remove it first if you want to regenerate." >&2
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exit 1
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fi
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nix-shell -p openssh --run "ssh-keygen -t ed25519 -N '' -C '${hostname}' -f '${keyfile}'" >/dev/null
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age_pub="$(nix-shell -p ssh-to-age --run "ssh-to-age -i '${keyfile}.pub'")"
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cat <<EOF
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Generated: ${keyfile}(.pub)
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=== 1. Add this line under keys: in ${sops_yaml} ===
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- &${hostname} ${age_pub}
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=== 2. Add *${hostname} to whichever creation_rules key_groups this host needs ===
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(e.g. secrets/common.yaml always; add a per-host secrets/${hostname}.yaml
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block too if this host will get its own secrets, same pattern as
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nix-cache/server.)
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=== 3. Re-encrypt every secrets file you just added it to ===
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nix-shell -p sops --run 'sops updatekeys ${repo_root}/secrets/common.yaml'
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=== 4. Commit + push this repo so the flake build picks up the new recipient ===
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=== 5. Get the key onto the installer, one of two ways ===
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a) Rebuild the installer image with all host-keys/ baked in (see
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docs/auto-installer.md):
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NIXOS_HOST_KEYS_DIR="${keydir}" nix build .#iso --impure
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(or .#pxe — --impure is required since host-keys/ is gitignored and
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flakes can't see it otherwise)
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b) Or, for an image already built without keys, scp it in after boot:
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scp ${keyfile}{,.pub} root@<target-ip>:/root/host-keys/
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Then continue with /etc/auto-install.sh as normal — it checks
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/etc/host-keys (baked in) before /root/host-keys (scp'd) and installs
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whichever it finds before running nixos-install.
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EOF
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