feat: add version-file input

Resolves the GoReleaser version from a file. Currently supports the
asdf/mise `.tool-versions` format; resolved value takes precedence
over the `version` input.

  # .tool-versions
  goreleaser 2.13.0

  - uses: goreleaser/goreleaser-action@v7
    with:
      version-file: .tool-versions
      args: release --clean

Path is resolved relative to `workdir` unless absolute. Bare semvers
are auto-prefixed with `v`; constraint expressions and `latest` are
returned as-is. Multiple fallback versions per asdf convention are
accepted but only the first is used.

Refs #541
Closes #542

Co-authored-by: Anthony Couvreur <22034450+acouvreur@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

README.md

@@ -222,11 +222,28 @@ Following inputs can be used as `step.with` keys
 |------------------|---------|--------------|------------------------------------------------------------------|
 | `distribution`   | String  | `goreleaser` | GoReleaser distribution, either `goreleaser` or `goreleaser-pro` |
 | `version`**¹**   | String  | `~> v2`      | GoReleaser version                                               |
+| `version-file`**²** | String  |              | Read the GoReleaser version from a file (see below)              |
 | `args`           | String  |              | Arguments to pass to GoReleaser                                  |
 | `workdir`        | String  | `.`          | Working directory (below repository root)                        |
 | `install-only`   | Bool    | `false`      | Just install GoReleaser                                          |
 
 > **¹** Can be a fixed version like `v0.117.0` or a max satisfying semver one like `~> 0.132`. In this case this will return `v0.132.1`.
+>
+> **²** Path to a file containing the GoReleaser version. Resolved relative
+> to `workdir`. Currently only [`.tool-versions`](https://asdf-vm.com/manage/configuration.html#tool-versions)
+> (asdf/mise) format is supported. When set, this takes precedence over `version`.
+>
+> ```yaml
+> # .tool-versions
+> goreleaser 2.13.0
+> ```
+>
+> ```yaml
+> - uses: goreleaser/goreleaser-action@v7
+>   with:
+>     version-file: .tool-versions
+>     args: release --clean
+> ```
 
 ### outputs
 

__tests__/version.test.ts

@@ -0,0 +1,117 @@
+import {describe, expect, it, beforeEach, afterEach} from '@jest/globals';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import {getRequestedVersion} from '../src/version';
+import {Inputs} from '../src/context';
+
+const baseInputs = (overrides: Partial<Inputs>): Inputs => ({
+  distribution: 'goreleaser',
+  version: '~> v2',
+  versionFile: '',
+  args: '',
+  workdir: '.',
+  installOnly: false,
+  ...overrides
+});
+
+describe('getRequestedVersion', () => {
+  let tmpDir: string;
+
+  beforeEach(() => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'goreleaser-version-'));
+  });
+
+  afterEach(() => {
+    fs.rmSync(tmpDir, {recursive: true, force: true});
+  });
+
+  const writeToolVersions = (content: string, name = '.tool-versions'): void => {
+    fs.writeFileSync(path.join(tmpDir, name), content);
+  };
+
+  describe('without version-file', () => {
+    it('returns the version input as-is', () => {
+      expect(getRequestedVersion(baseInputs({version: 'v1.2.3'}))).toBe('v1.2.3');
+    });
+
+    it('returns the default version when none is provided', () => {
+      expect(getRequestedVersion(baseInputs({version: '~> v2'}))).toBe('~> v2');
+    });
+  });
+
+  describe('with .tool-versions', () => {
+    it('parses an unprefixed version and adds the v prefix', () => {
+      writeToolVersions('goreleaser 1.2.3\n');
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('v1.2.3');
+    });
+
+    it('keeps an existing v prefix without doubling it', () => {
+      writeToolVersions('goreleaser v1.2.3\n');
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('v1.2.3');
+    });
+
+    it('takes precedence over the version input', () => {
+      writeToolVersions('goreleaser 1.2.3\n');
+      expect(getRequestedVersion(baseInputs({version: 'v9.9.9', versionFile: '.tool-versions', workdir: tmpDir}))).toBe(
+        'v1.2.3'
+      );
+    });
+
+    it('ignores other tools and picks goreleaser', () => {
+      writeToolVersions(['nodejs 20.10.0', 'goreleaser 2.13.0', 'python 3.12.1', ''].join('\n'));
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('v2.13.0');
+    });
+
+    it('skips full-line and inline comments', () => {
+      writeToolVersions(['# pinned for CI', 'goreleaser 2.13.0 # minimum cosign-verifiable', ''].join('\n'));
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('v2.13.0');
+    });
+
+    it('preserves "latest"', () => {
+      writeToolVersions('goreleaser latest\n');
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('latest');
+    });
+
+    it('uses only the first version when multiple fallbacks are listed', () => {
+      // asdf supports listing fallback versions; we install the first match.
+      writeToolVersions('goreleaser 2.13.0 2.12.4\n');
+      expect(getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toBe('v2.13.0');
+    });
+
+    it('accepts an absolute path and ignores workdir', () => {
+      const abs = path.join(tmpDir, '.tool-versions');
+      fs.writeFileSync(abs, 'goreleaser 2.13.0\n');
+      expect(getRequestedVersion(baseInputs({versionFile: abs, workdir: '/nonexistent'}))).toBe('v2.13.0');
+    });
+
+    it('throws when the file does not exist', () => {
+      expect(() => getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toThrow(
+        /version-file not found/
+      );
+    });
+
+    it('throws when the file has no goreleaser entry', () => {
+      writeToolVersions(['nodejs 20.10.0', 'python 3.12.1', ''].join('\n'));
+      expect(() => getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toThrow(
+        /No goreleaser entry/
+      );
+    });
+
+    it('throws when the goreleaser entry has no version', () => {
+      writeToolVersions('goreleaser\n');
+      expect(() => getRequestedVersion(baseInputs({versionFile: '.tool-versions', workdir: tmpDir}))).toThrow(
+        /No version specified for goreleaser/
+      );
+    });
+  });
+
+  describe('with an unsupported file', () => {
+    it('throws a clear error', () => {
+      fs.writeFileSync(path.join(tmpDir, '.go-version'), '1.2.3\n');
+      expect(() => getRequestedVersion(baseInputs({versionFile: '.go-version', workdir: tmpDir}))).toThrow(
+        /Unsupported version-file/
+      );
+    });
+  });
+});

action.yml

@@ -15,6 +15,12 @@ inputs:
     description: 'GoReleaser version'
     default: '~> v2'
     required: false
+  version-file:
+    description: |
+      Read the GoReleaser version from a file. Path is resolved relative to
+      `workdir`. Currently only `.tool-versions` (asdf/mise) is supported.
+      When set, takes precedence over `version`.
+    required: false
   args:
     description: 'Arguments to pass to GoReleaser'
     required: false

src/context.ts

@@ -7,6 +7,7 @@ export const osArch: string = os.arch();
 export interface Inputs {
   distribution: string;
   version: string;
+  versionFile: string;
   args: string;
   workdir: string;
   installOnly: boolean;
@@ -16,6 +17,7 @@ export async function getInputs(): Promise<Inputs> {
   return {
     distribution: core.getInput('distribution') || 'goreleaser',
     version: core.getInput('version') || '~> v2',
+    versionFile: core.getInput('version-file'),
     args: core.getInput('args'),
     workdir: core.getInput('workdir') || '.',
     installOnly: core.getBooleanInput('install-only')

src/main.ts

@@ -4,14 +4,16 @@ import yargs from 'yargs';
 import type {Arguments} from 'yargs';
 import * as context from './context';
 import * as goreleaser from './goreleaser';
+import {getRequestedVersion} from './version';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 
 async function run(): Promise<void> {
   try {
     const inputs: context.Inputs = await context.getInputs();
-    const bin = await goreleaser.install(inputs.distribution, inputs.version);
-    core.info(`GoReleaser ${inputs.version} installed successfully`);
+    const version = getRequestedVersion(inputs);
+    const bin = await goreleaser.install(inputs.distribution, version);
+    core.info(`GoReleaser ${version} installed successfully`);
 
     if (inputs.installOnly) {
       const goreleaserDir = path.dirname(bin);

src/version.ts

@@ -0,0 +1,56 @@
+import * as fs from 'fs';
+import * as path from 'path';
+import {Inputs} from './context';
+
+// Resolves the GoReleaser version to install.
+//
+// When `version-file` is set, it is read from disk and parsed; the resolved
+// value takes precedence over the `version` input. Otherwise, `version` is
+// returned as-is (it always has a default — see context.getInputs).
+export function getRequestedVersion(inputs: Inputs): string {
+  if (!inputs.versionFile) {
+    return inputs.version;
+  }
+
+  const filePath = path.isAbsolute(inputs.versionFile)
+    ? inputs.versionFile
+    : path.join(inputs.workdir || '.', inputs.versionFile);
+
+  if (!fs.existsSync(filePath)) {
+    throw new Error(`version-file not found: ${filePath}`);
+  }
+
+  const basename = path.basename(filePath);
+  const content = fs.readFileSync(filePath, 'utf-8');
+
+  switch (basename) {
+    case '.tool-versions':
+      return parseToolVersions(content, filePath);
+    default:
+      throw new Error(`Unsupported version-file: ${filePath} (only .tool-versions is supported)`);
+  }
+}
+
+// Parses a single `goreleaser <version>` entry out of a `.tool-versions` file
+// (asdf/mise format). Full-line `#` comments and inline `# ...` suffixes are
+// stripped. When a tool lists multiple fallback versions only the first is
+// used. Bare semvers are returned with a leading `v`; constraint expressions
+// (`~> v2`, `latest`, ...) are returned as-is.
+function parseToolVersions(content: string, filePath: string): string {
+  for (const rawLine of content.split('\n')) {
+    const line = rawLine.replace(/#.*$/, '').trim();
+    if (!line) {
+      continue;
+    }
+    const tokens = line.split(/\s+/);
+    if (tokens[0] !== 'goreleaser') {
+      continue;
+    }
+    const version = tokens[1];
+    if (!version) {
+      throw new Error(`No version specified for goreleaser in ${filePath}`);
+    }
+    return /^\d/.test(version) ? `v${version}` : version;
+  }
+  throw new Error(`No goreleaser entry found in ${filePath}`);
+}