darmanandClaude Sonnet 5
0ea90200b4
./scripts/deploy install <config> localhost now branches on is_live_installer() (checks uname -n): outside a live installer it builds installer-iso, stages its kernel/initrd on the ESP and the iso file on a disk the caller picks (never auto-picked — the wrong disk here is destroyed mid-install), writes a systemd-boot one-shot findiso= entry with homelab.install=<config> on the kernel cmdline, and does a real systemctl reboot (not kexec — terra's kexec-local hang is specifically in kexec's device-shutdown pass, a real ACPI reboot never runs that code at all). installer-iso gains homelab-auto-install.service: once homelab-checkout.service clones the repo, it reads homelab.install= back off /proc/cmdline and re-runs the identical deploy command itself, now genuinely inside the installer, so it takes the disko+nixos-install branch instead of preparing again. The whole reinstall is one command and unattended after the first reboot. Also: every root-requiring path (kexec-local, the new prepare-and-reboot branch, the disko+nixos-install branch) self-elevates via a require_root() helper that re-execs the original invocation under sudo -E, instead of dying and asking the caller to prefix sudo themselves. Uses an absolute script path captured before the script's own cd, so the re-exec is correct regardless of how it was invoked. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
629 lines
31 KiB
Bash
Executable File
629 lines
31 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Deploy a NixOS host from this flake. ALL arguments are mandatory (no defaults).
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#
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# ./deploy kexec <config> <host> headless kexec into a RAM installer, for a
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# read-only-root box (ZimaOS) where
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# nixos-anywhere can't ssh-copy-id. Ships our
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# SSH login key. Then run `install`. <config>
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# is only used to look up the vault item.
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# ./deploy kexec-local [--yes] kexec THIS machine into the RAM installer,
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# no ssh/second machine involved. Run as root,
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# locally, on the box you're installing onto.
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# Disks are untouched; console drops for
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# ~1-2 min then comes back as the installer.
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# Prompts for confirmation (--yes skips it),
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# because run on the wrong terminal this
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# kexecs your laptop. TMPDIR (default
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# /var/tmp) must be exec-capable and hold
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# ~3x the tarball.
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# Then run `install <config> localhost`.
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# ./deploy install <config> <host> first install. Wipes the OS disk. Ships the
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# host's sops key. <host>=localhost/127.0.0.1
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# skips nixos-anywhere/ssh and runs disko +
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# nixos-install directly against /mnt — but
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# ONLY once actually inside a live installer
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# (hostname nixos-installer, from kexec, or
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# homelab-installer, from installer-iso).
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# Run from the REAL running OS instead (e.g.
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# a box where kexec-local doesn't work),
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# it builds installer-iso, stages its
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# kernel/initrd on the ESP + the iso file on
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# a non-OS-disk partition, sets a systemd-boot
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# one-shot entry with homelab.install=<config>
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# on its kernel cmdline, and reboots — a real
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# ACPI reboot, not a kexec jump. The booted
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# installer's homelab-auto-install.service
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# reads that cmdline param and re-runs this
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# exact command itself once its repo checkout
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# (homelab-checkout.service) succeeds, finishing
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# the install unattended. See CLAUDE.md.
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# ./deploy switch <config> <host> rebuild + activate on a running host.
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# ./deploy boot <config> <host> stage for next boot, don't activate now.
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# ./deploy test <config> <host> activate without adding a boot entry.
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# ./deploy image <config> build an SD-card image (e.g. rpi mercury).
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# ./deploy flash <config> <dev> build SD image, write to <dev>, and (if
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# ~/.config/homelab/<config>/age.txt exists)
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# drop the sops key on its boot partition.
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#
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# <config> = a nixosConfigurations name (e.g. jupiter, vps). Its pre-generated
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# SSH host key must be at ~/.config/homelab/<config>/ssh_host_ed25519_key.
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#
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# Runs from a non-NixOS host too (nixos-rebuild / nixos-anywhere via `nix run`).
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#
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# Password prompts are auto-filled from the "HomeLab" Proton Pass vault when
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# `pass-cli` is installed and logged in; otherwise every command prompts exactly
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# as before. Both items are keyed by <config>, never by <host>: the address is
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# incidental (DHCP, a new box, localhost) while the config name is the stable
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# identity of the machine being built.
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# darman@<config> darman's sudo password (switch/boot/test)
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# root@<config> root's ssh password (kexec/install)
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# Override with HOMELAB_PASS_ITEM / HOMELAB_PASS_ROOT_ITEM / HOMELAB_PASS_VAULT.
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set -euo pipefail
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shopt -s nullglob
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# Captured before anything shifts/parses $@, so require_root() below can
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# re-exec the ORIGINAL invocation under sudo — inside a function, "$@"/"$1"
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# refer to the function's own args (empty here), not the script's, so this
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# has to be a global array instead of relying on positional-parameter scoping.
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SCRIPT_ARGS=("$@")
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# Locate the repo root (flake dir) regardless of where this script lives on disk.
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SCRIPT_PATH="$(realpath "$0")" # absolute — "$0" itself may be relative,
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# and require_root() re-execs after cd "$REPO"
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SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
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REPO="$(git -C "$SCRIPT_DIR" rev-parse --show-toplevel 2>/dev/null || dirname "$SCRIPT_DIR")"
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cd "$REPO"
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export PATH="/nix/var/nix/profiles/default/bin:$PATH"
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die() { echo "error: $*" >&2; exit 1; }
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need() { command -v "$1" >/dev/null 2>&1 || die "missing required tool: $1"; }
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# Self-elevate instead of dying: re-exec this exact invocation under sudo.
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# -E preserves the environment (HOMELAB_* overrides, Proton Pass vault vars)
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# across the re-exec. A no-op once already root.
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require_root() {
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[ "$(id -u)" = 0 ] && return 0
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echo ">> $1 needs root — re-executing under sudo" >&2
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exec sudo -E -- "$SCRIPT_PATH" "${SCRIPT_ARGS[@]}"
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}
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# Exactly one path matching a glob, or die. `ls glob | head -1` silently yields
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# an empty string when nothing matches (head exits 0, so set -e never fires) and
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# the failure only surfaces later as a confusing tar/dd error.
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one_match() {
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local what="$1"; shift
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local f=("$@") # caller expands the glob (nullglob is on)
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[ "${#f[@]}" -gt 0 ] || die "no $what found — did the build actually produce one?"
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printf '%s\n' "${f[0]}"
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}
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# Sets tb / cpio / bbox — the kexec tarball plus the static cpio+gzip that
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# kexec-run.sh needs on PATH to rebuild its initrd.
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#
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# HOMELAB_KEXEC_TARBALL (with _CPIO / _GZIP) short-circuits the build and uses a
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# prebuilt installer instead. That lets the VM test in flake.nix drive this
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# script offline, and lets you re-kexec a box without rebuilding ~500MB.
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kexec_artifacts() {
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if [ -n "${HOMELAB_KEXEC_TARBALL:-}" ]; then
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tb="$HOMELAB_KEXEC_TARBALL"
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[ -f "$tb" ] || die "HOMELAB_KEXEC_TARBALL=$tb is not a file"
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cpio="${HOMELAB_KEXEC_CPIO:-$(command -v cpio || true)}"
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bbox="${HOMELAB_KEXEC_GZIP:-$(command -v gzip || true)}"
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{ [ -n "$cpio" ] && [ -n "$bbox" ]; } \
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|| die "set HOMELAB_KEXEC_CPIO / HOMELAB_KEXEC_GZIP, or put cpio+gzip on PATH"
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echo ">> using prebuilt kexec installer: $tb"
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else
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need nix
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echo ">> building kexec installer + static tools"
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nix build .#nixosConfigurations.kexec.config.system.build.kexecInstallerTarball \
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-o result-kexec
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tb="$(one_match 'kexec tarball' result-kexec/*.tar.gz)"
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cpio="$(nix build --no-link --print-out-paths nixpkgs#pkgsStatic.cpio)/bin/cpio"
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bbox="$(nix build --no-link --print-out-paths nixpkgs#pkgsStatic.busybox)/bin/busybox"
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fi
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}
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# True inside one of the throwaway live-installer environments this repo
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# produces (kexec's nixos-installer, or installer-iso's homelab-installer) —
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# i.e. `install <config> localhost` should wipe/install right here. False on
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# any real running OS, where the same command instead means "prepare and
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# reboot into an installer for THIS box" (see local_install_prepare_and_reboot).
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is_live_installer() {
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case "$(uname -n)" in
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nixos-installer | homelab-installer) return 0 ;;
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*) return 1 ;;
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esac
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}
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# `install <config> localhost` run on a REAL running OS (not already inside a
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# live installer): builds installer-iso, stages its kernel/initrd + iso file
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# locally, points a systemd-boot one-shot entry at them with
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# homelab.install=<config> on the kernel cmdline, and reboots — a real ACPI
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# reboot through firmware POST, deliberately NOT a kexec jump (see terra's
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# kexec-local gotcha in CLAUDE.md). The booted installer's
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# homelab-auto-install.service reads that cmdline param and re-runs this exact
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# `install <config> localhost` command itself (now genuinely inside the
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# installer) once homelab-checkout.service has fetched the repo, finishing the
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# job unattended.
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local_install_prepare_and_reboot() {
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local config="$1"
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require_root "preparing a local reinstall"
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[ -d /sys/firmware/efi ] || die "not booted UEFI — the one-shot boot entry needs systemd-boot"
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need bootctl
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need nix
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need lsblk
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need findmnt
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# No default/auto-picked location — the wrong disk here is destroyed
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# mid-install (see the OS-disk check below), so this always asks rather
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# than guessing. HOMELAB_INSTALLER_STAGE_DIR skips the prompt for scripted
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# use, but is otherwise just as explicit a choice as typing it in.
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local stagedir="${HOMELAB_INSTALLER_STAGE_DIR:-}"
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if [ -z "$stagedir" ]; then
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echo ">> currently mounted filesystems:"
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lsblk -o NAME,SIZE,FSTYPE,MOUNTPOINT
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read -rp ">> path to stage the installer iso on (must NOT be on the OS disk being wiped): " stagedir
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fi
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[ -n "$stagedir" ] || die "no staging path given"
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[ -d "$stagedir" ] \
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|| die "staging dir $stagedir doesn't exist — needs to be an existing partition that is NOT the OS disk being wiped"
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# Refuse if the staging partition turns out to live on the same disk
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# disko is about to wipe — the iso file (and the running installer
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# loopback-mounted from it) would be destroyed mid-install.
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local osdisk osdisk_real stage_src stage_pkname stage_disk_real
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osdisk="$(nix eval --raw ".#nixosConfigurations.$config.config.disko.devices.disk" \
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--apply 'd: (builtins.head (builtins.attrValues d)).device' 2>/dev/null)" \
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|| die "couldn't read the OS disk device from hosts/$config/disk-config.nix"
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osdisk_real="$(readlink -f "$osdisk")"
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stage_src="$(findmnt -no SOURCE --target "$stagedir")" \
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|| die "$stagedir doesn't resolve to a mounted filesystem"
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stage_pkname="$(lsblk -no PKNAME "$stage_src" 2>/dev/null || true)"
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if [ -n "$stage_pkname" ]; then
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stage_disk_real="$(readlink -f "/dev/$stage_pkname")"
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[ "$stage_disk_real" = "$osdisk_real" ] \
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&& die "$stagedir is on the OS disk ($osdisk) that install would wipe — re-run and pick a different disk"
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fi
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echo ">> building installer-iso (kernel + initrd + iso image)"
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local kernel initrd isodir iso mnt_point iso_relpath
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kernel="$(nix build --no-link --print-out-paths .#nixosConfigurations.installer-iso.config.system.build.kernel)/bzImage"
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initrd="$(nix build --no-link --print-out-paths .#nixosConfigurations.installer-iso.config.system.build.initialRamdisk)/initrd"
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isodir="$(nix build --no-link --print-out-paths .#nixosConfigurations.installer-iso.config.system.build.isoImage)"
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iso="$(one_match 'installer iso' "$isodir"/iso/*.iso)"
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echo ">> staging kernel/initrd on the ESP, iso image on $stagedir"
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install -Dm644 "$kernel" /boot/homelab-installer/bzImage
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install -Dm644 "$initrd" /boot/homelab-installer/initrd
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install -Dm644 "$iso" "$stagedir/homelab-installer.iso"
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# findiso= is a path relative to whatever partition the initrd finds it on
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# (it mounts every blkid-visible partition looking for it) — not necessarily
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# relative to `/`, if $stagedir is a subdirectory of a bigger filesystem
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# rather than a mountpoint itself.
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mnt_point="$(findmnt -no TARGET --target "$stagedir")"
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iso_relpath="${stagedir#"$mnt_point"}/homelab-installer.iso"
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cat >/boot/loader/entries/homelab-installer.conf <<EOF
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title Homelab Installer ($config, findiso)
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linux /homelab-installer/bzImage
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initrd /homelab-installer/initrd
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options nohibernate root=fstab loglevel=4 lsm=landlock,yama,bpf findiso=$iso_relpath homelab.install=$config
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EOF
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echo ">> one-shot boot into the installer, then rebooting — it will finish this install itself"
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bootctl set-oneshot homelab-installer.conf
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systemctl reboot
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}
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# Flakes only see git-tracked files: an untracked hosts/<config>/ is silently
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# invisible to `nix build`/`nixos-install`, which then fails obscurely or builds
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# a stale config. Check before doing anything destructive.
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require_tracked() {
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local config="$1" cfgfile="hosts/$1/configuration.nix"
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[ -e "$cfgfile" ] || die "no $cfgfile in the repo"
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# No .git at all (e.g. a tarball export of the repo, no working tree) means
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# there's nothing that CAN be untracked — nothing to check. Only skip on a
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# MISSING .git, not on any other git failure.
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git -C "$REPO" rev-parse --is-inside-work-tree >/dev/null 2>&1 || return 0
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git -C "$REPO" ls-files --error-unmatch "$cfgfile" >/dev/null 2>&1 \
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|| die "$cfgfile is untracked — 'git add hosts/$config' first (flakes ignore untracked files)"
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}
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# The password field of a Proton Pass item ("--field password" prints the bare
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# value, one line), or empty if pass-cli is missing / logged out / has no such
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# item — every caller then falls back to the normal interactive prompt.
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#
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# Resolve the title to an item id among ACTIVE items first, because `item view
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# --item-title` has no state filter: Proton Pass keeps deleted items in the
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# trash, and if a trashed item shares the title, view can match THAT one and
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# return an empty password with exit 0. Empty is indistinguishable from "no such
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# item", so the only symptom is a silent fall back to the interactive prompt
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# even though the vault clearly holds the entry. (Hit for real on darman@neptun,
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# which had an Active and a Trashed copy.)
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proton_pass_password() {
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local title="$1" vault="${HOMELAB_PASS_VAULT:-HomeLab}" id pw
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command -v pass-cli >/dev/null 2>&1 || return 0
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# Lines look like: - [ITEM_ID]: the title (state=Active)
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id="$(pass-cli item list --vault-name "$vault" --filter-state active \
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--output human 2>/dev/null \
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| awk -v t="$title" '
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{ i = index($0, "]: "); if (i == 0) next
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id = substr($0, 4, i - 4)
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rest = substr($0, i + 3)
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sub(/ \(state=[^)]*\)$/, "", rest)
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if (rest == t) { print id; exit } }' || true)"
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if [ -n "$id" ]; then
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pw="$(pass-cli item view --vault-name "$vault" --item-id "$id" \
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--field password --output human 2>/dev/null | head -1 || true)"
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# Resolved an active item but its password field is blank: worth saying so,
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# otherwise this looks identical to having no vault entry at all.
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[ -n "$pw" ] || echo ">> vault item '$title' resolved but its password field is empty" >&2
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else
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# No active match — fall back to the title lookup so an older pass-cli
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# without --filter-state still works exactly as it used to.
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pw="$(pass-cli item view --vault-name "$vault" --item-title "$title" \
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--field password --output human 2>/dev/null | head -1 || true)"
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fi
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printf '%s' "$pw"
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}
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# Path to an sshpass binary (system one, else built from nixpkgs). Empty if
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# neither is available.
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sshpass_bin() {
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command -v sshpass 2>/dev/null && return 0
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nix build --no-link --print-out-paths nixpkgs#sshpass 2>/dev/null \
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| sed 's|$|/bin/sshpass|'
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}
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cmd="${1:-}"; [ -n "$cmd" ] || die "usage: ./deploy <kexec|kexec-local|install|switch|boot|test|image|flash> ..."
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case "$cmd" in
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kexec)
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config="${2:-}"; host="${3:-}"
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{ [ -n "$config" ] && [ -n "$host" ]; } || die "usage: ./deploy kexec <config> <host>"
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need ssh; need scp
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# kexec/run rebuilds an initrd with `cpio` + `gzip` from PATH — ZimaOS lacks
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# both. Ship static ones: GNU cpio (reliable -o -H newc), busybox as gzip.
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kexec_artifacts
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# One password prompt: multiplex scp + ssh over a shared control connection.
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cm="/tmp/homelab-cm-%r@%h:%p"
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o=(-o ControlMaster=auto -o "ControlPath=$cm" -o ControlPersist=300 \
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-o StrictHostKeyChecking=accept-new)
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# Root's password from Proton Pass, fed to ssh/scp via sshpass -e. Only the
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# first (master) connection authenticates; the rest ride the control socket.
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#
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# SSHPASS is exported here rather than passed as `env SSHPASS=... sshpass`.
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# Both end up equally safe at rest: `env` execs its target immediately, so
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# the assignment is only in argv for the sub-millisecond before exec, after
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# which /proc/PID/cmdline reads plain `sshpass -e`. Exporting just closes
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# that race window and drops a process. Either way the secret lives in the
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# child's environ, which is readable by the owner and root only.
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sp=()
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root_item="${HOMELAB_PASS_ROOT_ITEM:-root@$config}"
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root_pw="$(proton_pass_password "$root_item" || true)"
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if [ -n "$root_pw" ]; then
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sshpass="$(sshpass_bin || true)"
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if [ -n "$sshpass" ]; then
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export SSHPASS="$root_pw"
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sp=("$sshpass" -e)
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# sshpass drives the password prompt; don't let a key/agent short-circuit
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# into an interactive one for a host that only accepts passwords.
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o+=(-o PreferredAuthentications=password -o PubkeyAuthentication=no)
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else
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echo ">> sshpass unavailable — falling back to the interactive prompt" >&2
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fi
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fi
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unset root_pw
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if [ "${#sp[@]}" -gt 0 ]; then
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echo ">> connecting to root@$host (password from Proton Pass: $root_item)"
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else
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echo ">> connecting to root@$host (enter the root password once)"
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fi
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"${sp[@]+"${sp[@]}"}" ssh "${o[@]}" "root@$host" 'mkdir -p /tmp/bin'
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scp "${o[@]}" "$cpio" "root@$host:/tmp/bin/cpio"
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scp "${o[@]}" "$bbox" "root@$host:/tmp/bin/gzip" # busybox as gzip (argv0)
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echo ">> streaming installer + kexec-ing. SSH drops as the box jumps into the"
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echo " RAM installer. Disks are untouched."
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rc=0
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ssh "${o[@]}" "root@$host" \
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'chmod +x /tmp/bin/*; mkdir -p /tmp/k && tar -C /tmp/k -xzf - && PATH=/tmp/bin:$PATH /tmp/k/kexec/run' \
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< "$tb" || rc=$?
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# A dropped connection IS the success case here, so this can't be fatal —
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# but a full /tmp, a tar error or a missing static tool looks identical from
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# the outside, so at least surface the code instead of swallowing it.
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[ "$rc" -eq 0 ] || echo ">> ssh exited $rc — expected if the box jumped; suspect this if install can't connect" >&2
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ssh "${o[@]}" -O exit "root@$host" 2>/dev/null || true # close control socket
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unset SSHPASS
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# NB: no ssh-keygen -R here on purpose. kexec-run.sh copies /etc/ssh/ssh_host_*
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# into the appended initrd and restore-remote-access.nix installs them back
|
|
# into the installer's /etc/ssh, so the host key SURVIVES the jump. Clearing
|
|
# known_hosts would just throw away the TOFU record for no reason.
|
|
|
|
echo ">> box is kexec-ing. Wait ~1-2 min for the installer + network, then:"
|
|
echo " ./deploy install $config $host"
|
|
;;
|
|
|
|
kexec-local)
|
|
# No ssh, no second machine: build the same RAM installer as `kexec`, but
|
|
# run it directly on this box (you're sitting at it). The current shell
|
|
# drops when the kernel switches, same as any reboot — that's expected,
|
|
# not a failure. Disks are untouched; only the running kernel changes.
|
|
#
|
|
# This is a one-way trip on the machine you are typing at, so every check
|
|
# that can fail is done BEFORE the point of no return, and nothing that the
|
|
# jump depends on is cleaned up behind it (see the trap discussion below).
|
|
require_root "kexec-local"
|
|
|
|
assume_yes=""
|
|
[ "${2:-}" = "--yes" ] && assume_yes=1
|
|
|
|
need tar; need install; need mktemp; need find; need sync; need nohup
|
|
|
|
# --- preflight: reasons the jump would fail, checked while it's still safe --
|
|
# CONFIG_KEXEC. Without it kexec --load fails and you've built ~1GB for
|
|
# nothing; with lockdown it fails at load time too (Secure Boot blocks the
|
|
# kexec_load syscall unless the image is signed).
|
|
[ -e /sys/kernel/kexec_loaded ] \
|
|
|| die "this kernel has no kexec support (CONFIG_KEXEC) — boot install media instead"
|
|
if [ -r /sys/kernel/security/lockdown ] \
|
|
&& ! grep -q '\[none\]' /sys/kernel/security/lockdown 2>/dev/null; then
|
|
die "kernel lockdown is active — kexec_load is blocked. Disable Secure Boot, or boot install media."
|
|
fi
|
|
|
|
kexec_artifacts
|
|
|
|
# Staging lives on /var/tmp, not /tmp: kexec-run.sh APPENDS a fresh cpio to
|
|
# kexec/initrd in place and runs binaries out of this directory, so it needs
|
|
# real space and exec permission. A tmpfs /tmp is both size-capped (ENOSPC
|
|
# mid-append = a half-written initrd) and frequently noexec.
|
|
stage="$(TMPDIR="${TMPDIR:-/var/tmp}" mktemp -d)"
|
|
trap 'rm -rf "$stage"' EXIT
|
|
|
|
# noexec would only surface as a cryptic "Permission denied" on kexec/run.
|
|
printf '#!/bin/sh\nexit 0\n' > "$stage/.execmove"
|
|
chmod +x "$stage/.execmove"
|
|
"$stage/.execmove" 2>/dev/null \
|
|
|| die "$stage is mounted noexec — set TMPDIR to an exec-capable filesystem"
|
|
rm -f "$stage/.execmove"
|
|
|
|
# Need room for the tarball, its extracted contents, and the appended cpio.
|
|
tb_sz="$(stat -Lc %s "$tb")"
|
|
avail="$(df -B1 --output=avail "$stage" | tail -1 | tr -d ' ')"
|
|
[ "$avail" -ge $(( tb_sz * 3 )) ] \
|
|
|| die "only $(( avail / 1024 / 1024 ))MB free on $stage, need ~$(( tb_sz * 3 / 1024 / 1024 ))MB — set TMPDIR elsewhere"
|
|
|
|
install -Dm755 "$cpio" "$stage/bin/cpio"
|
|
install -Dm755 "$bbox" "$stage/bin/gzip" # busybox as gzip (argv0)
|
|
mkdir -p "$stage/k" && tar -C "$stage/k" -xzf "$tb"
|
|
|
|
# Fail loudly here rather than with a bare "not found" from kexec/run.
|
|
for f in run kexec bzImage initrd ip; do
|
|
[ -f "$stage/k/kexec/$f" ] || die "kexec tarball is missing kexec/$f — bad build?"
|
|
done
|
|
|
|
# The installer root is a RAM disk: the initrd has to fit in memory with
|
|
# room to unpack. Refuse rather than OOM halfway into the new kernel, where
|
|
# there is no way back except the power button.
|
|
img_sz="$(( $(stat -Lc %s "$stage/k/kexec/initrd") + $(stat -Lc %s "$stage/k/kexec/bzImage") ))"
|
|
mem_kb="$(awk '/^MemTotal:/{print $2}' /proc/meminfo)"
|
|
[ "$(( mem_kb * 1024 ))" -ge "$(( img_sz * 3 ))" ] \
|
|
|| die "only $(( mem_kb / 1024 ))MB RAM for a $(( img_sz / 1024 / 1024 ))MB RAM-disk installer — too tight, boot install media instead"
|
|
|
|
# --- confirmation: this script normally runs on the LAPTOP ------------------
|
|
# A stray `kexec-local` here would jump the machine you develop on, not the
|
|
# target. Name it explicitly so a wrong-terminal mistake is visible.
|
|
echo ">> about to kexec THIS machine:"
|
|
echo " hostname: $(uname -n)"
|
|
echo " kernel: $(uname -r)"
|
|
echo " root: $(findmnt -no SOURCE / 2>/dev/null || echo '?')"
|
|
echo " Disks are untouched; only the running kernel changes. Console drops"
|
|
echo " for ~1-2 min, then comes back as the installer."
|
|
if [ -z "$assume_yes" ]; then
|
|
read -rp ">> type 'yes' to kexec $(uname -n) into the RAM installer: " ok
|
|
[ "$ok" = yes ] || die "aborted"
|
|
fi
|
|
|
|
# kexec -e jumps straight to the new kernel: no unmount, no journal flush,
|
|
# no systemd shutdown. Anything still in page cache is lost and the OS disk
|
|
# is left dirty. Cheap insurance, since the box may yet be rebooted back.
|
|
sync
|
|
|
|
echo ">> loading the new kernel"
|
|
if ! PATH="$stage/bin:$PATH" "$stage/k/kexec/run"; then
|
|
rm -rf "$stage"
|
|
die "kexec/run failed — machine untouched, still on the old kernel"
|
|
fi
|
|
|
|
# kexec --load succeeded iff the kernel now reports a loaded image. If this
|
|
# is 0 the background `kexec -e` below will do nothing and we'd hang forever
|
|
# waiting for a jump that cannot happen.
|
|
[ "$(cat /sys/kernel/kexec_loaded 2>/dev/null || echo 0)" = 1 ] \
|
|
|| { rm -rf "$stage"; die "kexec reported success but no image is loaded — aborting"; }
|
|
|
|
# THE trap MUST GO NOW. kexec-run.sh backgrounds `nohup sh -c "sleep 6 &&
|
|
# $SCRIPT_DIR/kexec -e"` and returns immediately, so the binary that
|
|
# performs the jump still has to exist ~6s after this script would normally
|
|
# exit. Letting the EXIT trap rm -rf "$stage" deletes it out from under that
|
|
# sleeping shell and the machine silently never jumps.
|
|
trap - EXIT
|
|
|
|
sync
|
|
echo ">> kernel loaded; jumping in ~6s. (staging left at $stage on purpose —"
|
|
echo " the backgrounded kexec still needs it; it's gone after the jump.)"
|
|
# Outlive the sleep 6 so the jump happens while this script is still alive.
|
|
sleep 60
|
|
die "still here after 60s — the jump did not happen. Check dmesg; the old system is intact."
|
|
;;
|
|
|
|
install)
|
|
config="${2:-}"; host="${3:-}"
|
|
{ [ -n "$config" ] && [ -n "$host" ]; } || die "usage: ./deploy install <config> <host>"
|
|
hostkey="$HOME/.config/homelab/$config/ssh_host_ed25519_key"
|
|
[ -f "$hostkey" ] || die "missing host key: $hostkey"
|
|
[ -d "./hosts/$config" ] || die "no ./hosts/$config directory in the repo"
|
|
require_tracked "$config"
|
|
|
|
if [ "$host" = "localhost" ] || [ "$host" = "127.0.0.1" ]; then
|
|
if ! is_live_installer; then
|
|
# Not already inside a live installer: build one, stage it, one-shot
|
|
# boot into it, and let it finish this exact command itself. See
|
|
# local_install_prepare_and_reboot above and CLAUDE.md.
|
|
local_install_prepare_and_reboot "$config"
|
|
exit 0
|
|
fi
|
|
|
|
# Local install: no ssh, no nixos-anywhere. Run after `kexec-local` (or
|
|
# from a live ISO) so /mnt is free to wipe — this IS the box, no second
|
|
# machine in the loop, so skip straight to disko + nixos-install.
|
|
require_root "local install"
|
|
[ -f "./hosts/$config/disk-config.nix" ] || die "no ./hosts/$config/disk-config.nix"
|
|
|
|
echo ">> disko .#$config onto this box's OS disk (WILL be wiped)"
|
|
nix run github:nix-community/disko -- \
|
|
--mode disko "./hosts/$config/disk-config.nix"
|
|
|
|
echo ">> installing sops host key so it can decrypt on boot #1"
|
|
install -Dm600 "$hostkey" /mnt/etc/ssh/ssh_host_ed25519_key
|
|
install -Dm644 "$hostkey.pub" /mnt/etc/ssh/ssh_host_ed25519_key.pub
|
|
|
|
echo ">> nixos-install .#$config into /mnt"
|
|
nixos-install --root /mnt --flake ".#$config"
|
|
else
|
|
# Stage the pre-generated SSH host key so sops can decrypt on boot #1.
|
|
stage="$(mktemp -d)"
|
|
trap 'rm -rf "$stage"' EXIT
|
|
install -Dm600 "$hostkey" "$stage/etc/ssh/ssh_host_ed25519_key"
|
|
install -Dm644 "$hostkey.pub" "$stage/etc/ssh/ssh_host_ed25519_key.pub"
|
|
|
|
echo ">> nixos-anywhere .#$config onto root@$host (OS disk WILL be wiped)"
|
|
anywhere=(--flake ".#$config"
|
|
--extra-files "$stage"
|
|
--generate-hardware-config nixos-generate-config "./hosts/$config/hardware-configuration.nix"
|
|
--target-host "root@$host")
|
|
|
|
# nixos-anywhere's --env-password reads root's ssh password from $SSHPASS
|
|
# (it ships its own sshpass), so a vault hit skips the ssh-copy-id prompt.
|
|
# Exported rather than `env SSHPASS=...` for consistency with `kexec`;
|
|
# see the note there — it's a marginal win, not a leak fix.
|
|
root_item="${HOMELAB_PASS_ROOT_ITEM:-root@$config}"
|
|
root_pw="$(proton_pass_password "$root_item" || true)"
|
|
if [ -n "$root_pw" ]; then
|
|
echo ">> root ssh password from Proton Pass ($root_item)"
|
|
export SSHPASS="$root_pw"
|
|
unset root_pw
|
|
nix run github:nix-community/nixos-anywhere -- \
|
|
--env-password "${anywhere[@]}"
|
|
unset SSHPASS
|
|
else
|
|
nix run github:nix-community/nixos-anywhere -- "${anywhere[@]}"
|
|
fi
|
|
fi
|
|
;;
|
|
|
|
switch|boot|test)
|
|
config="${2:-}"; host="${3:-}"
|
|
{ [ -n "$config" ] && [ -n "$host" ]; } || die "usage: ./deploy $cmd <config> <host>"
|
|
require_tracked "$config"
|
|
|
|
echo ">> nixos-rebuild $cmd .#$config on darman@$host"
|
|
# --ask-sudo-password, not the deprecated --use-remote-sudo: common.nix sets
|
|
# security.sudo.wheelNeedsPassword = true, and --use-remote-sudo only
|
|
# prefixes with sudo without ever prompting. Asks for darman's password
|
|
# (the darman_password hash in each host's sops file).
|
|
rebuild=(nix run nixpkgs#nixos-rebuild -- "$cmd"
|
|
--flake ".#$config"
|
|
--target-host "darman@$host"
|
|
--ask-sudo-password)
|
|
|
|
item="${HOMELAB_PASS_ITEM:-darman@$config}"
|
|
pw="$(proton_pass_password "$item" || true)"
|
|
if [ -n "$pw" ] && command -v setsid >/dev/null 2>&1; then
|
|
# nixos-rebuild prompts with getpass(), which reads /dev/tty and ignores a
|
|
# piped stdin. setsid drops the controlling terminal, so getpass falls back
|
|
# to stdin and takes the vault password (it warns about echo — harmless,
|
|
# nothing is echoed since the password never reaches the terminal).
|
|
#
|
|
# Caveat of dropping the tty: EVERY prompt in the subtree now reads this
|
|
# stdin, not just the sudo one. Feed the line a few times so a retry or a
|
|
# second sudo ask doesn't hit EOF and hang. Anything else that prompts
|
|
# (an ssh key passphrase, a host-key confirmation) will still fail — fix
|
|
# those out of band rather than by feeding more lines here.
|
|
echo ">> sudo password from Proton Pass ($item)"
|
|
printf '%s\n%s\n%s\n' "$pw" "$pw" "$pw" | setsid -w "${rebuild[@]}"
|
|
else
|
|
"${rebuild[@]}"
|
|
fi
|
|
unset pw
|
|
;;
|
|
|
|
image|flash)
|
|
if [ "$cmd" = flash ]; then
|
|
config="${2:-}"; dev="${3:-}"
|
|
{ [ -n "$config" ] && [ -n "$dev" ]; } \
|
|
|| die "usage: ./deploy flash <config> <dev> (e.g. /dev/sdX)"
|
|
# Validate the device and the tools BEFORE building, so a bad `flash`
|
|
# fails fast instead of dying halfway through writing the card.
|
|
[ -b "$dev" ] || die "$dev is not a block device"
|
|
need zstdcat; need dd; need lsblk
|
|
else
|
|
config="${2:-}"; [ -n "$config" ] || die "usage: ./deploy image <config>"
|
|
fi
|
|
require_tracked "$config"
|
|
|
|
echo ">> building SD image for .#$config (aarch64 needs qemu binfmt)"
|
|
nix build ".#nixosConfigurations.$config.config.system.build.sdImage" -o result-sd
|
|
img="$(one_match 'SD image' result-sd/sd-image/*.img.zst)"
|
|
echo ">> image: $img"
|
|
[ "$cmd" = image ] && exit 0
|
|
|
|
echo ">> TARGET DEVICE — everything on it will be ERASED:"
|
|
lsblk -o NAME,SIZE,MODEL,TRAN,MOUNTPOINTS "$dev"
|
|
read -rp ">> type 'yes' to write $config to $dev: " ok
|
|
[ "$ok" = yes ] || die "aborted"
|
|
zstdcat "$img" | sudo dd of="$dev" bs=4M status=progress oflag=sync
|
|
sync
|
|
|
|
# If this config has a dedicated sops age key, drop it on the ROOT ext4
|
|
# partition at /var/lib/sops-nix/age.txt so sops decrypts on first boot.
|
|
# (The Pi's vfat partition isn't mounted at runtime, so the key can't live
|
|
# there.) Key stays off-repo, out of the nix store, and out of the image.
|
|
keyfile="$HOME/.config/homelab/$config/age.txt"
|
|
if [ -f "$keyfile" ]; then
|
|
echo ">> installing sops age key onto the root partition"
|
|
sudo partprobe "$dev" 2>/dev/null || sudo blockdev --rereadpt "$dev" 2>/dev/null || true
|
|
sudo udevadm settle 2>/dev/null || true
|
|
# Largest ext4 partition = the NixOS root. -P (KEY="value" pairs) instead
|
|
# of a columnar listing: an empty FSTYPE collapses under whitespace
|
|
# splitting and shifts every later field.
|
|
rootpart="$(lsblk -bPo PATH,FSTYPE,SIZE "$dev" \
|
|
| sed -n 's/^PATH="\([^"]*\)" FSTYPE="ext4" SIZE="\([0-9]*\)"$/\2 \1/p' \
|
|
| sort -rn | head -1 | cut -d' ' -f2)"
|
|
[ -n "$rootpart" ] || die "no ext4 root partition found on $dev — place $keyfile at /var/lib/sops-nix/age.txt manually"
|
|
mnt="$(mktemp -d)"
|
|
sudo mount "$rootpart" "$mnt"
|
|
sudo install -Dm600 "$keyfile" "$mnt/var/lib/sops-nix/age.txt"
|
|
sudo sync
|
|
sudo umount "$mnt"; rmdir "$mnt"
|
|
echo ">> age key installed (/var/lib/sops-nix/age.txt)"
|
|
fi
|
|
echo ">> done — insert the card into the Pi and boot."
|
|
;;
|
|
|
|
*)
|
|
die "unknown command '$cmd' (kexec|kexec-local|install|switch|boot|test|image|flash)"
|
|
;;
|
|
esac
|