forked from Fediversity/Fediversity
102 lines
4.2 KiB
HCL
102 lines
4.2 KiB
HCL
locals {
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system = "x86_64-linux"
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# dependency paths pre-calculated from npins
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pins = jsondecode(file("${path.module}/.npins.json"))
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# nix path: expose pins, use nixpkgs in flake commands (`nix run`)
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nix_path = "${join(":", [for name, dir in local.pins : "${name}=${dir}"])}:flake=${local.pins["nixpkgs"]}:flake"
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}
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# hash of our code directory, used to trigger re-deploy
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# FIXME calculate separately to reduce false positives
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data "external" "hash" {
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program = ["sh", "-c", "echo \"{\\\"hash\\\":\\\"$(nix-hash ..)\\\"}\""]
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}
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# TF resource to build and deploy NixOS instances.
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resource "terraform_data" "nixos" {
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# trigger rebuild/deploy if (FIXME?) any potentially used config/code changed,
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# preventing these (20+s, build being bottleneck) when nothing changed.
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# terraform-nixos separates these to only deploy if instantiate changed,
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# yet building even then - which may be not as bad using deploy on remote.
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# having build/deploy one resource reflects wanting to prevent no-op rebuilds
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# over preventing (with less false positives) no-op deployments,
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# as i could not find a way to do prevent no-op rebuilds without merging them:
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# - generic resources cannot have outputs, while we want info from the instantiation (unless built on host?).
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# - `data` always runs, which is slow for deploy and especially build.
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triggers_replace = [
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data.external.hash.result,
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var.hostname,
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var.config_nix,
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var.config_tf,
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]
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provisioner "local-exec" {
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# directory to run the script from. we use the TF project root dir,
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# here as a path relative from where TF is run from,
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# matching calling modules' expectations on config_nix locations.
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# note that absolute paths can cause false positives in triggers,
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# so are generally discouraged in TF.
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working_dir = path.root
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environment = {
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# nix path used on build, lets us refer to e.g. nixpkgs like `<nixpkgs>`
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NIX_PATH = local.nix_path
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}
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# TODO: refactor back to command="ignoreme" interpreter=concat([]) to protect sensitive data from error logs?
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# TODO: build on target?
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command = <<-EOF
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set -euo pipefail
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# INSTANTIATE
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command=(
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nix-instantiate
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--expr
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'let
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os = import <nixpkgs/nixos> {
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system = "${local.system}";
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configuration =
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${var.config_nix} //
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# template parameters passed in from TF thru json
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builtins.fromJSON "${replace(jsonencode(var.config_tf), "\"", "\\\"")}" //
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{
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# nix path for debugging
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nix.nixPath = [ "${local.nix_path}" ];
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};
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};
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in
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# info we want to get back out
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{
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substituters = builtins.concatStringsSep " " os.config.nix.settings.substituters;
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trusted_public_keys = builtins.concatStringsSep " " os.config.nix.settings.trusted-public-keys;
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drv_path = os.config.system.build.toplevel.drvPath;
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out_path = os.config.system.build.toplevel;
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}'
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)
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# instantiate the config in /nix/store
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"$${command[@]}" -A out_path
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# get the other info
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json="$("$${command[@]}" --eval --strict --json)"
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# DEPLOY
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declare substituters trusted_public_keys drv_path
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# set our variables using the json object
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eval "export $(echo $json | jaq -r 'to_entries | map("\(.key)=\(.value)") | @sh')"
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host="root@${var.hostname}.${var.vm_domain}" # FIXME: #24
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buildArgs=(
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--option extra-binary-caches https://cache.nixos.org/
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--option substituters $substituters
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--option trusted-public-keys $trusted_public_keys
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)
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sshOpts=(
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-o BatchMode=yes
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-o StrictHostKeyChecking=no
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)
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# get the realized derivation to deploy
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outPath=$(nix-store --realize "$drv_path" "$${buildArgs[@]}")
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# deploy the config by nix-copy-closure
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NIX_SSHOPTS="$${sshOpts[*]}" nix-copy-closure --to "$host" "$outPath" --gzip --use-substitutes
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# switch the remote host to the config
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ssh "$${sshOpts[@]}" "$host" "nix-env --profile /nix/var/nix/profiles/system --set $outPath; $outPath/bin/switch-to-configuration switch"
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EOF
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}
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}
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