Feature: Allow non-existing exclude file

README.md

@@ -50,6 +50,7 @@ Here is a quick example of how to install this action in any workflow:
 | `yaml_exclude_regex` | `false` | `""` | A regex to exclude files from validation (e.g. `".*\.schema\.yaml$"` to exclude all files ending with `.schema.yaml`) - Default is `""` which doesn't exclude any files |
 | `yaml_as_json` | `false` | `"false"` | Whether or not to treat and validate YAML files as JSON files - `"true"` or `"false"` - Default is `"false"`. If this is true, the JSON schema will be used to validate YAML files. Any YAML schemas will be ignored. For this context, a YAML file is any file which matches the yaml_extension or yaml_extension_short inputs. See the [docs](docs/yaml_as_json.md) for more details |
 | `exclude_file` | `false` | `""` | The full path to a file in the repository where this Action is running that contains a list of '.gitignore'-style patterns to exclude files from validation (e.g. ./exclude.txt) |
+| `exclude_file_required` | `true` | `"true"` | Whether or not the `exclude_file` must exist if it is used. If this is `true` and the `exclude_file` does not exist, the Action will fail. Set this to `"false"` if you do not care when the `exclude_file` exists or not |
 | `use_gitignore` | `true` | `"true"` | Whether or not to use the .gitignore file in the root of the repository to exclude files from validation - `"true"` or `"false"` - Default is `"true"` |
 | `git_ignore_path` | `false` | `".gitignore"` | The full path to the .gitignore file to use if use_gitignore is set to "true" (e.g. ./src/.gitignore) - Default is ".gitignore" which uses the .gitignore file in the root of the repository |
 | `allow_multiple_documents` | `false` | `"false"` | Whether or not to allow multiple documents in a single YAML file - `"true"` or `"false"` - Default is `"false"`. Useful for k8s documents. |

__tests__/functions/exclude.test.js

@@ -2,14 +2,20 @@ import * as core from '@actions/core'
 import {Exclude} from '../../src/functions/exclude'
 
 const warningMock = jest.spyOn(core, 'warning').mockImplementation(() => {})
+const setFailedMock = jest.spyOn(core, 'setFailed').mockImplementation(() => {})
+const infoMock = jest.spyOn(core, 'info').mockImplementation(() => {})
+const debugMock = jest.spyOn(core, 'debug').mockImplementation(() => {})
 
 var exclude
 beforeEach(() => {
   jest.clearAllMocks()
   jest.spyOn(core, 'debug').mockImplementation(() => {})
+  jest.spyOn(core, 'setFailed').mockImplementation(() => {})
+  jest.spyOn(core, 'info').mockImplementation(() => {})
   process.env.INPUT_EXCLUDE_FILE = '__tests__/fixtures/exclude/exclude.txt'
   process.env.INPUT_GIT_IGNORE_PATH = '.gitignore'
   process.env.INPUT_USE_GITIGNORE = 'true'
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'true'
   exclude = new Exclude()
 })
 
@@ -44,6 +50,40 @@ test('does not exclude any files when no exclude file is used', () => {
   expect(exclude.isExcluded('exclude-me.json')).toBe(false)
 })
 
+test('raises an exception when no exclude file is found', () => {
+  process.env.INPUT_EXCLUDE_FILE = 'oh_no_i_dont_exist.txt'
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'true'
+
+  expect(() => {
+    new Exclude()
+  }).toThrow(
+    `Error: ENOENT: no such file or directory, open 'oh_no_i_dont_exist.txt'`
+  )
+  expect(setFailedMock).toHaveBeenCalledWith(
+    `error reading exclude_file: oh_no_i_dont_exist.txt`
+  )
+})
+
+test('does not raise an exception when no exclude file is found and it is not required', () => {
+  process.env.INPUT_EXCLUDE_FILE = 'oh_no_i_dont_exist.txt'
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'false'
+
+  const exclude = new Exclude()
+  expect(exclude.isExcluded('exclude-me.json')).toBe(false)
+  expect(infoMock).toHaveBeenCalledWith(
+    `exclude_file was not found, but it is not required - OK`
+  )
+})
+
+test('does not raise an exception when no exclude file is found and it is required', () => {
+  process.env.INPUT_EXCLUDE_FILE = ''
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'true'
+
+  const exclude = new Exclude()
+  expect(exclude.isExcluded('exclude-me.json')).toBe(false)
+  expect(debugMock).toHaveBeenCalledWith(`exclude_file was not provided - OK`)
+})
+
 test('excludes a file that is not tracked by git', () => {
   process.env.INPUT_EXCLUDE_FILE = ''
   const exclude = new Exclude()

__tests__/main.test.js

@@ -1,10 +1,12 @@
+import * as core from '@actions/core'
 import {run} from '../src/main'
 import * as jsonValidator from '../src/functions/json-validator'
 import * as yamlValidator from '../src/functions/yaml-validator'
 import * as processResults from '../src/functions/process-results'
 
 beforeEach(() => {
   jest.clearAllMocks()
+  jest.spyOn(core, 'debug').mockImplementation(() => {})
   jest.spyOn(jsonValidator, 'jsonValidator').mockImplementation(() => {
     return {success: true, failed: 0, passed: 8, skipped: 0, violations: []}
   })
@@ -16,6 +18,7 @@ beforeEach(() => {
   })
 
   process.env.INPUT_USE_GITIGNORE = 'false'
+  process.env.INPUT_EXCLUDE_FILE_REQUIRED = 'true'
 })
 
 test('successfully runs the action', async () => {

action.yml

@@ -73,6 +73,10 @@ inputs:
     description: The full path to a file in the repository where this Action is running that contains a list of '.gitignore'-style patterns to exclude files from validation (e.g. ./exclude.txt)
     required: false
     default: ""
+  exclude_file_required:
+    description: Whether or not the exclude_file must exist if it is used. If this is true and the exclude_file does not exist, the Action will fail - "true" or "false" - Default is "true"
+    required: false
+    default: "true"
   use_gitignore:
     description: Whether or not to use the .gitignore file in the root of the repository to exclude files from validation - "true" or "false" - Default is "true"
     required: true

src/functions/exclude.js

@@ -5,6 +5,7 @@ import ignore from 'ignore'
 export class Exclude {
   constructor() {
     this.path = core.getInput('exclude_file')
+    this.required = core.getBooleanInput('exclude_file_required')
     this.gitTrackedOnly = core.getBooleanInput('use_gitignore')
 
     // initialize the exclude array
@@ -13,8 +14,19 @@ export class Exclude {
     // read the exclude file if it was used
     if (this.path && this.path !== '') {
       core.debug(`loading exclude_file: ${this.path}`)
-      this.ignore.add(readFileSync(this.path, 'utf8').toString())
-      core.debug(`loaded custom exclude patterns`)
+      try {
+        this.ignore.add(readFileSync(this.path, 'utf8').toString())
+        core.debug(`loaded custom exclude patterns`)
+      } catch (error) {
+        if (this.required === true) {
+          core.setFailed(`error reading exclude_file: ${this.path}`)
+          throw new Error(error)
+        }
+
+        core.info(`exclude_file was not found, but it is not required - OK`)
+      }
+    } else {
+      core.debug(`exclude_file was not provided - OK`)
     }
 
     // if gitTrackOnly is true, add the git exclude patterns from the .gitignore file if it exists