erik
2b170af346
- scripts now find the flake root regardless of cwd or where they live on PATH - gitignore .env
100 lines
4.4 KiB
Bash
Executable File
100 lines
4.4 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 <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`.
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# ./deploy install <config> <host> first install (nixos-anywhere). Wipes the
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# OS disk. Ships the host's sops key.
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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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#
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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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set -euo pipefail
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# Locate the repo root (flake dir) regardless of where this script lives on disk.
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SCRIPT_DIR="$(cd "$(dirname "$(realpath "$0")")" && pwd)"
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REPO="$(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: $*" >&2; exit 1; }
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cmd="${1:-}"; [ -n "$cmd" ] || die "usage: ./deploy <kexec|install|switch|boot|test> ..."
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case "$cmd" in
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kexec)
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host="${2:-}"; [ -n "$host" ] || die "usage: ./deploy kexec <host>"
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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="$(ls result-kexec/*.tar.gz | head -1)"
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# kexec/run rebuilds an initrd with `cpio` + `gzip` from PATH — ZimaOS lacks
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# both. Ship static ones: GNU cpio (reliable -o -H newc), busybox as gzip.
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cpio="$(nix build --no-link --print-out-paths nixpkgs#pkgsStatic.cpio)/bin/cpio"
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bbox="$(nix build --no-link --print-out-paths nixpkgs#pkgsStatic.busybox)/bin/busybox"
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# One password prompt: multiplex scp + ssh over a shared control connection.
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cm="/tmp/homelab-cm-%r@%h:%p"
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o=(-o ControlMaster=auto -o "ControlPath=$cm" -o ControlPersist=300 \
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-o StrictHostKeyChecking=accept-new)
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echo ">> connecting to root@$host (enter the root password once)"
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ssh "${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@$host:/tmp/bin/gzip" # busybox as gzip (argv0)
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echo ">> streaming installer + kexec-ing. SSH drops as the box jumps into the"
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echo " RAM installer. Disks are untouched."
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ssh "${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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< "$tb" || true
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ssh "${o[@]}" -O exit "root@$host" 2>/dev/null || true # close control socket
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echo ">> box is kexec-ing. Wait ~1-2 min for the installer + network, then:"
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echo " ./deploy install <config> $host"
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;;
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install)
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config="${2:-}"; host="${3:-}"
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{ [ -n "$config" ] && [ -n "$host" ]; } || die "usage: ./deploy install <config> <host>"
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hostkey="$HOME/.config/homelab/$config/ssh_host_ed25519_key"
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[ -f "$hostkey" ] || die "missing host key: $hostkey"
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[ -d "./$config" ] || die "no ./$config directory in the repo"
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# Stage the pre-generated SSH host key so sops can decrypt on boot #1.
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stage="$(mktemp -d)"
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trap 'rm -rf "$stage"' EXIT
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install -Dm600 "$hostkey" "$stage/etc/ssh/ssh_host_ed25519_key"
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install -Dm644 "$hostkey.pub" "$stage/etc/ssh/ssh_host_ed25519_key.pub"
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echo ">> nixos-anywhere .#$config onto root@$host (OS disk WILL be wiped)"
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nix run github:nix-community/nixos-anywhere -- \
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--flake ".#$config" \
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--extra-files "$stage" \
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--generate-hardware-config nixos-generate-config "./$config/hardware-configuration.nix" \
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--target-host "root@$host"
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;;
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switch|boot|test)
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config="${2:-}"; host="${3:-}"
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{ [ -n "$config" ] && [ -n "$host" ]; } || die "usage: ./deploy $cmd <config> <host>"
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echo ">> nixos-rebuild $cmd .#$config on darman@$host"
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nix run nixpkgs#nixos-rebuild -- "$cmd" \
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--flake ".#$config" \
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--target-host "darman@$host" \
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--use-remote-sudo
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;;
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*)
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die "unknown command '$cmd' (kexec|install|switch|boot|test)"
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;;
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esac
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