actions/nix-installer-action
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Support private flakes on FlakeHub (#38)

Browse source 
Use the GitHub Actions-issued JWT to authenticate with FlakeHub.
The repository will be granted its due permissions on FlakeHub,
and be able to pull the user's private flakes.
This commit is contained in:
Graham Christensen 2023-10-04 17:35:16 -04:00 committed by GitHub
parent d654f7b93a
commit 07ebb8d274
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 194 additions and 107 deletions
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28
README.md
View file

@ -15,13 +15,38 @@ jobs:
steps:
- uses: actions/checkout@v3
- name: Install Nix
uses: DeterminateSystems/nix-installer-action@v4
uses: DeterminateSystems/nix-installer-action@main
- name: Run `nix build`
run: nix build .
```
See [`.github/workflows/ci.yml`](.github/workflows/ci.yml) for a full example.
To use private flakes from FlakeHub, use a configuration like this:
```yaml
on:
pull_request:
push:
branches: [main]
jobs:
lints:
name: Build
runs-on: ubuntu-22.04
permissions:
id-token: "write"
contents: "read"
steps:
- uses: actions/checkout@v3
- name: Install Nix
uses: DeterminateSystems/nix-installer-action@main
with:
flakehub: true
- name: Run `nix build`
run: nix build .
```
## Configuration
| Parameter | Description | Type | Default |
@ -29,6 +54,7 @@ See [`.github/workflows/ci.yml`](.github/workflows/ci.yml) for a full example.
| `backtrace` | The setting for [`RUST_BACKTRACE`][backtrace] | string | |
| `extra-args` | Extra arguments to pass to the planner (prefer using structured `with:` arguments unless using a custom [planner]!) | string | |
| `extra-conf` | Extra configuration lines for `/etc/nix/nix.conf` (includes `access-tokens` with `secrets.GITHUB_TOKEN` automatically if `github-token` is set) | string | |
| `flakehub` | Log in to FlakeHub to pull private flakes using the GitHub Actions [JSON Web Token](https://jwt.io) (JWT), which is bound to the `api.flakehub.com` audience. | Boolean | `false` |
| `github-token` | A [GitHub token] for making authenticated requests (which have a higher rate-limit quota than unauthenticated requests) | string | `${{ github.token }}` |
| `init` | The init system to configure (requires `planner: linux-multi`) | enum (`none` or `systemd`) | |
| `local-root` | A local `nix-installer` binary root. Overrides the `nix-installer-url` setting (a `nix-installer.sh` should exist, binaries should be named `nix-installer-$ARCH`, eg. `nix-installer-x86_64-linux`). | Boolean | `false` |

4
action.yml
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@ -13,6 +13,10 @@ inputs:
extra-conf:
description: Extra configuration lines for `/etc/nix/nix.conf` (includes `access-tokens` with `secrets.GITHUB_TOKEN` automatically if `github-token` is set)
required: false
flakehub:
description: Automatically log in to your [FlakeHub](https://flakehub.com) account, for accessing private flakes.
required: false
default: false
github-token:
description: A GitHub token for making authenticated requests (which have a higher rate-limit quota than unauthenticated requests)
default: ${{ github.token }}

27
dist/index.js vendored
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@ -61,6 +61,7 @@ class NixInstallerAction {
this.backtrace = action_input_string_or_null("backtrace");
this.extra_args = action_input_string_or_null("extra-args");
this.extra_conf = action_input_multiline_string_or_null("extra-conf");
this.flakehub = action_input_bool("flakehub");
this.github_token = action_input_string_or_null("github-token");
this.init = action_input_string_or_null("init");
this.local_root = action_input_string_or_null("local-root");
@ -87,6 +88,7 @@ class NixInstallerAction {
this.nix_installer_url = resolve_nix_installer_url(this.platform, this.correlation);
}
executionEnvironment() {
return __awaiter(this, void 0, void 0, function* () {
const execution_env = {};
execution_env.NIX_INSTALLER_NO_CONFIRM = "true";
execution_env.NIX_INSTALLER_DIAGNOSTIC_ATTRIBUTION = this.correlation;
@ -186,6 +188,10 @@ class NixInstallerAction {
extra_conf += `trusted-users = root ${process.env.USER}`;
extra_conf += "\n";
}
if (this.flakehub) {
extra_conf += `netrc-file = ${yield this.flakehub_login()}`;
extra_conf += "\n";
}
if (this.extra_conf !== null && this.extra_conf.length !== 0) {
extra_conf += this.extra_conf.join("\n");
extra_conf += "\n";
@ -196,10 +202,11 @@ class NixInstallerAction {
execution_env.NIX_INSTALLER_INIT = "none";
}
return execution_env;
});
}
execute_install(binary_path) {
return __awaiter(this, void 0, void 0, function* () {
const execution_env = this.executionEnvironment();
const execution_env = yield this.executionEnvironment();
actions_core.info(`Execution environment: ${JSON.stringify(execution_env, null, 4)}`);
const args = ["install"];
if (this.planner) {
@ -276,6 +283,24 @@ class NixInstallerAction {
}
});
}
flakehub_login() {
var _a;
return __awaiter(this, void 0, void 0, function* () {
const netrc_path = `${process.env["RUNNER_TEMP"]}/determinate-nix-installer-netrc`;
const jwt = yield actions_core.getIDToken("api.flakehub.com");
yield (0, promises_1.writeFile)(netrc_path, [
`machine api.flakehub.com login flakehub password ${jwt}`,
`machine flakehub.com login flakehub password ${jwt}`,
].join("\n"));
actions_core.info("Logging in to FlakeHub.");
// the join followed by a match on ^... looks silly, but extra_config
// could contain multi-line values
if ((_a = this.extra_conf) === null || _a === void 0 ? void 0 : _a.join("\n").match(/^netrc-file/m)) {
actions_core.warning("Logging in to FlakeHub conflicts with the Nix option `netrc-file`.");
}
return netrc_path;
});
}
execute_uninstall() {
return __awaiter(this, void 0, void 0, function* () {
const spawned = (0, node_child_process_1.spawn)(`/nix/nix-installer`, ["uninstall"], {

2
dist/index.js.map vendored
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File diff suppressed because one or more lines are too long

38
src/main.ts
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@ -1,6 +1,6 @@
import * as actions_core from "@actions/core";
import * as github from "@actions/github";
import { mkdtemp, chmod, access } from "node:fs/promises";
import { mkdtemp, chmod, access, writeFile } from "node:fs/promises";
import { spawn } from "node:child_process";
import { randomUUID } from "node:crypto";
import { join } from "node:path";
@ -17,6 +17,7 @@ class NixInstallerAction {
backtrace: string | null;
extra_args: string | null;
extra_conf: string[] | null;
flakehub: boolean;
github_token: string | null;
// TODO: linux_init
init: string | null;
@ -54,6 +55,7 @@ class NixInstallerAction {
this.backtrace = action_input_string_or_null("backtrace");
this.extra_args = action_input_string_or_null("extra-args");
this.extra_conf = action_input_multiline_string_or_null("extra-conf");
this.flakehub = action_input_bool("flakehub");
this.github_token = action_input_string_or_null("github-token");
this.init = action_input_string_or_null("init");
this.local_root = action_input_string_or_null("local-root");
@ -93,7 +95,7 @@ class NixInstallerAction {
);
}
private executionEnvironment(): ExecuteEnvironment {
private async executionEnvironment(): Promise<ExecuteEnvironment> {
const execution_env: ExecuteEnvironment = {};
execution_env.NIX_INSTALLER_NO_CONFIRM = "true";
@ -217,6 +219,10 @@ class NixInstallerAction {
extra_conf += `trusted-users = root ${process.env.USER}`;
extra_conf += "\n";
}
if (this.flakehub) {
extra_conf += `netrc-file = ${await this.flakehub_login()}`;
extra_conf += "\n";
}
if (this.extra_conf !== null && this.extra_conf.length !== 0) {
extra_conf += this.extra_conf.join("\n");
extra_conf += "\n";
@ -234,7 +240,7 @@ class NixInstallerAction {
}
private async execute_install(binary_path: string): Promise<number> {
const execution_env = this.executionEnvironment();
const execution_env = await this.executionEnvironment();
actions_core.info(
`Execution environment: ${JSON.stringify(execution_env, null, 4)}`,
);
@ -326,6 +332,32 @@ class NixInstallerAction {
}
}
async flakehub_login(): Promise<string> {
const netrc_path = `${process.env["RUNNER_TEMP"]}/determinate-nix-installer-netrc`;
const jwt = await actions_core.getIDToken("api.flakehub.com");
await writeFile(
netrc_path,
[
`machine api.flakehub.com login flakehub password ${jwt}`,
`machine flakehub.com login flakehub password ${jwt}`,
].join("\n"),
);
actions_core.info("Logging in to FlakeHub.");
// the join followed by a match on ^... looks silly, but extra_config
// could contain multi-line values
if (this.extra_conf?.join("\n").match(/^netrc-file/m)) {
actions_core.warning(
"Logging in to FlakeHub conflicts with the Nix option `netrc-file`.",
);
}
return netrc_path;
}
async execute_uninstall(): Promise<number> {
const spawned = spawn(`/nix/nix-installer`, ["uninstall"], {
env: {