Tool cache install from a manifest file (#382)

2020-05-19 13:25:57 -04:00 · 2020-05-19 13:25:57 -04:00 · 4e9375da09
parent dcf5c88bb3
commit 4e9375da09
8 changed files with 633 additions and 10 deletions
--- a/.eslintrc.json
+++ b/.eslintrc.json
@ -18,7 +18,7 @@
    "@typescript-eslint/await-thenable": "error",
    "@typescript-eslint/ban-ts-ignore": "error",
    "camelcase": "off",
-    "@typescript-eslint/camelcase": "error",
+    "@typescript-eslint/camelcase": "off",
    "@typescript-eslint/class-name-casing": "error",
    "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
    "@typescript-eslint/func-call-spacing": ["error", "never"],
--- a/packages/github/tests/lib.test.ts
+++ b/packages/github/tests/lib.test.ts
@ -55,7 +55,6 @@ describe('@actions/context', () => {
  it('works with pull_request payloads', () => {
    delete process.env.GITHUB_REPOSITORY
    context.payload = {
-      // eslint-disable-next-line @typescript-eslint/camelcase
      pull_request: {number: 2},
      repository: {owner: {login: 'user'}, name: 'test'}
    }
--- a/packages/tool-cache/tests/data/versions-manifest.json
+++ b/packages/tool-cache/tests/data/versions-manifest.json
@ -0,0 +1,86 @@
+[
+  {
+    "version": "3.0.1",
+    "stable": false,
+    "release_url": "https://github.com/actions/sometool/releases/tag/3.0.1-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-3.0.1-linux-x64.tar.gz",
+        "arch": "x64",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/3.0.1-20200402.6/sometool-1.2.3-linux-x64.tar.gz"
+      }      
+    ]
+  },
+  {
+    "version": "2.0.2",
+    "stable": true,
+    "release_url": "https://github.com/actions/sometool/releases/tag/2.0.2-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-2.0.2-linux-x64.tar.gz",
+        "arch": "x64",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/2.0.2-20200402.6/sometool-2.0.2-linux-x64.tar.gz"
+      },
+      {
+        "filename": "sometool-2.0.2-linux-x32.tar.gz",
+        "arch": "x32",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/2.0.2-20200402.6/sometool-2.0.2-linux-x32.tar.gz"
+      },
+      {
+        "filename": "sometool-2.0.2-linux-x32.tar.gz",
+        "arch": "x64",
+        "platform": "windows",
+        "download_url": "https://github.com/actions/sometool/releases/tag/2.0.2-20200402.6/sometool-2.0.2-linux-x32.tar.gz"
+      }      
+    ]
+  },  
+  {
+    "version": "1.2.4",
+    "stable": true,
+    "release_url": "https://github.com/actions/sometool/releases/tag/1.2.4-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-1.2.4-ubuntu1804-x64.tar.gz",
+        "arch": "x64",
+        "platform": "linux",
+        "platform_version": "18.04",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.4-20200402.6/sometool-1.2.4-ubuntu1804-x64.tar.gz"
+      },
+      {
+        "filename": "sometool-1.2.4-darwin1015-x64.tar.gz",
+        "arch": "x64",
+        "platform": "darwin",
+        "platform_version": "10.15",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.4-20200402.6/sometool-1.2.4-darwin1015-x64.tar.gz"
+      }            
+    ]
+  },      
+  {
+    "version": "1.2.3",
+    "stable": true,
+    "release_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-1.2.3-linux-x64.tar.gz",
+        "arch": "x64",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x64.tar.gz"
+      },
+      {
+        "filename": "sometool-1.2.3-linux-x32.tar.gz",
+        "arch": "x32",
+        "platform": "linux",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x32.tar.gz"
+      },
+      {
+        "filename": "sometool-1.2.3-linux-x32.zip",
+        "arch": "x64",
+        "platform": "windows",
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x32.zip"
+      }      
+    ]
+  }
+]
--- a/packages/tool-cache/tests/manifest.test.ts
+++ b/packages/tool-cache/tests/manifest.test.ts
@ -0,0 +1,272 @@
+import * as tc from '../src/tool-cache'
+import * as mm from '../src/manifest' // --> OFF
+
+// needs to be require for core node modules to be mocked
+// eslint-disable-next-line @typescript-eslint/no-require-imports
+import osm = require('os')
+// eslint-disable-next-line @typescript-eslint/no-require-imports
+import cp = require('child_process')
+//import {coerce} from 'semver'
+
+// we fetch the manifest file from master of a repo
+const owner = 'actions'
+const repo = 'some-tool'
+const fakeToken = 'notrealtoken'
+
+// just loading data and require handles BOMs etc.
+// eslint-disable-next-line @typescript-eslint/no-require-imports, @typescript-eslint/no-var-requires
+const manifestData = require('./data/versions-manifest.json')
+
+describe('@actions/tool-cache-manifest', () => {
+  let os: {platform: string; arch: string}
+
+  let getSpy: jest.SpyInstance
+  let platSpy: jest.SpyInstance
+  let archSpy: jest.SpyInstance
+  let execSpy: jest.SpyInstance
+  let readLsbSpy: jest.SpyInstance
+
+  beforeEach(() => {
+    // node
+    os = {platform: '', arch: ''}
+    platSpy = jest.spyOn(osm, 'platform')
+
+    platSpy.mockImplementation(() => os.platform)
+    archSpy = jest.spyOn(osm, 'arch')
+    archSpy.mockImplementation(() => os.arch)
+
+    execSpy = jest.spyOn(cp, 'execSync')
+    readLsbSpy = jest.spyOn(mm, '_readLinuxVersionFile')
+
+    getSpy = jest.spyOn(tc, 'getManifestFromRepo')
+    getSpy.mockImplementation(() => <mm.IToolRelease[]>manifestData)
+  })
+
+  afterEach(() => {
+    jest.resetAllMocks()
+    jest.clearAllMocks()
+    //jest.restoreAllMocks();
+  })
+
+  afterAll(async () => {}, 100000)
+
+  it('can query versions', async () => {
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+
+    expect(manifest).toBeDefined()
+    const l: number = manifest ? manifest.length : 0
+    expect(l).toBe(4)
+  })
+
+  it('can match stable major version for linux x64', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '2.x',
+      true,
+      manifest
+    )
+    expect(release).toBeDefined()
+    expect(release?.version).toBe('2.0.2')
+    expect(release?.files.length).toBe(1)
+    const file = release?.files[0]
+    expect(file).toBeDefined()
+    expect(file?.arch).toBe('x64')
+    expect(file?.platform).toBe('linux')
+    expect(file?.download_url).toBe(
+      'https://github.com/actions/sometool/releases/tag/2.0.2-20200402.6/sometool-2.0.2-linux-x64.tar.gz'
+    )
+    expect(file?.filename).toBe('sometool-2.0.2-linux-x64.tar.gz')
+  })
+
+  it('can match stable exact version for linux x64', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '1.2.3',
+      true,
+      manifest
+    )
+    expect(release).toBeDefined()
+    expect(release?.version).toBe('1.2.3')
+    expect(release?.files.length).toBe(1)
+    const file = release?.files[0]
+    expect(file).toBeDefined()
+    expect(file?.arch).toBe('x64')
+    expect(file?.platform).toBe('linux')
+    expect(file?.download_url).toBe(
+      'https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x64.tar.gz'
+    )
+    expect(file?.filename).toBe('sometool-1.2.3-linux-x64.tar.gz')
+  })
+
+  it('can match with linux platform version spec', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    readLsbSpy.mockImplementation(() => {
+      return `DISTRIB_ID=Ubuntu
+        DISTRIB_RELEASE=18.04
+        DISTRIB_CODENAME=bionic
+        DISTRIB_DESCRIPTION=Ubuntu 18.04.4 LTS`
+    })
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '1.2.4',
+      true,
+      manifest
+    )
+    expect(release).toBeDefined()
+    expect(release?.version).toBe('1.2.4')
+    expect(release?.files.length).toBe(1)
+    const file = release?.files[0]
+    expect(file).toBeDefined()
+    expect(file?.arch).toBe('x64')
+    expect(file?.platform).toBe('linux')
+    expect(file?.download_url).toBe(
+      'https://github.com/actions/sometool/releases/tag/1.2.4-20200402.6/sometool-1.2.4-ubuntu1804-x64.tar.gz'
+    )
+    expect(file?.filename).toBe('sometool-1.2.4-ubuntu1804-x64.tar.gz')
+  })
+
+  it('can match with darwin platform version spec', async () => {
+    os.platform = 'darwin'
+    os.arch = 'x64'
+
+    execSpy.mockImplementation(() => '10.15.1')
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '1.2.4',
+      true,
+      manifest
+    )
+    expect(release).toBeDefined()
+    expect(release?.version).toBe('1.2.4')
+    expect(release?.files.length).toBe(1)
+    const file = release?.files[0]
+    expect(file).toBeDefined()
+    expect(file?.arch).toBe('x64')
+    expect(file?.platform).toBe('darwin')
+    expect(file?.download_url).toBe(
+      'https://github.com/actions/sometool/releases/tag/1.2.4-20200402.6/sometool-1.2.4-darwin1015-x64.tar.gz'
+    )
+    expect(file?.filename).toBe('sometool-1.2.4-darwin1015-x64.tar.gz')
+  })
+
+  it('does not match with unmatched linux platform version spec', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    readLsbSpy.mockImplementation(() => {
+      return `DISTRIB_ID=Ubuntu
+        DISTRIB_RELEASE=16.04
+        DISTRIB_CODENAME=xenial
+        DISTRIB_DESCRIPTION=Ubuntu 16.04.4 LTS`
+    })
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '1.2.4',
+      true,
+      manifest
+    )
+    expect(release).toBeUndefined()
+  })
+
+  it('does not match with unmatched darwin platform version spec', async () => {
+    os.platform = 'darwin'
+    os.arch = 'x64'
+
+    execSpy.mockImplementation(() => '10.14.6')
+
+    const manifest: mm.IToolRelease[] | null = await tc.getManifestFromRepo(
+      owner,
+      repo,
+      fakeToken
+    )
+    const release: tc.IToolRelease | undefined = await tc.findFromManifest(
+      '1.2.4',
+      true,
+      manifest
+    )
+    expect(release).toBeUndefined()
+  })
+
+  it('can get version from lsb on ubuntu-18.04', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    //existsSpy.mockImplementation(() => true)
+    readLsbSpy.mockImplementation(() => {
+      return `DISTRIB_ID=Ubuntu
+        DISTRIB_RELEASE=18.04
+        DISTRIB_CODENAME=bionic
+        DISTRIB_DESCRIPTION=Ubuntu 18.04.4 LTS`
+    })
+
+    const version = mm._getOsVersion()
+
+    expect(osm.platform()).toBe('linux')
+    expect(version).toBe('18.04')
+  })
+
+  it('can get version from lsb on ubuntu-16.04', async () => {
+    os.platform = 'linux'
+    os.arch = 'x64'
+
+    readLsbSpy.mockImplementation(() => {
+      return `DISTRIB_ID=Ubuntu
+        DISTRIB_RELEASE=16.04
+        DISTRIB_CODENAME=xenial
+        DISTRIB_DESCRIPTION="Ubuntu 16.04.6 LTS"`
+    })
+
+    const version = mm._getOsVersion()
+
+    expect(osm.platform()).toBe('linux')
+    expect(version).toBe('16.04')
+  })
+
+  // sw_vers -productVersion
+  it('can get version on macOS', async () => {
+    os.platform = 'darwin'
+    os.arch = 'x64'
+
+    execSpy.mockImplementation(() => '10.14.6')
+
+    const version = mm._getOsVersion()
+
+    expect(osm.platform()).toBe('darwin')
+    expect(version).toBe('10.14.6')
+  })
+})
--- a/packages/tool-cache/package-lock.json
+++ b/packages/tool-cache/package-lock.json
@ -1,6 +1,6 @@
 {
 	"name": "@actions/tool-cache",
-	"version": "1.3.5",
+	"version": "1.5.3",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
--- a/packages/tool-cache/package.json
+++ b/packages/tool-cache/package.json
@ -1,6 +1,6 @@
 {
  "name": "@actions/tool-cache",
-  "version": "1.3.5",
+  "version": "1.5.4",
  "description": "Actions tool-cache lib",
  "keywords": [
    "github",
--- a/packages/tool-cache/src/manifest.ts
+++ b/packages/tool-cache/src/manifest.ts
@ -0,0 +1,158 @@
+import * as semver from 'semver'
+import {debug} from '@actions/core'
+
+// needs to be require for core node modules to be mocked
+/* eslint @typescript-eslint/no-require-imports: 0 */
+
+import os = require('os')
+import cp = require('child_process')
+import fs = require('fs')
+
+/*
+NOTE: versions must be sorted descending by version in the manifest
+      this library short circuits on first semver spec match
+
+      platform_version is an optional filter and can be a semver spec or range
+[
+  {
+    "version": "1.2.3",
+    "stable": true,
+    "release_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6",
+    "files": [
+      {
+        "filename": "sometool-1.2.3-linux-x64.zip",
+        "arch": "x64",
+        "platform": "linux",
+        "platform_version": "18.04"
+        "download_url": "https://github.com/actions/sometool/releases/tag/1.2.3-20200402.6/sometool-1.2.3-linux-x64.zip"
+      },
+    ...
+    ]
+  },
+  ...
+]
+*/
+
+export interface IToolReleaseFile {
+  filename: string
+  // 'aix', 'darwin', 'freebsd', 'linux', 'openbsd',
+  // 'sunos', and 'win32'
+  // platform_version is an optional semver filter
+  // TODO: do we need distribution (e.g. ubuntu).
+  //       not adding yet but might need someday.
+  //       right now, 16.04 and 18.04 work
+  platform: string
+  platform_version?: string
+
+  // 'arm', 'arm64', 'ia32', 'mips', 'mipsel',
+  // 'ppc', 'ppc64', 's390', 's390x',
+  // 'x32', and 'x64'.
+  arch: string
+
+  download_url: string
+}
+
+export interface IToolRelease {
+  version: string
+  stable: boolean
+  release_url: string
+  files: IToolReleaseFile[]
+}
+
+export async function _findMatch(
+  versionSpec: string,
+  stable: boolean,
+  candidates: IToolRelease[],
+  archFilter: string
+): Promise<IToolRelease | undefined> {
+  const platFilter = os.platform()
+
+  let result: IToolRelease | undefined
+  let match: IToolRelease | undefined
+
+  let file: IToolReleaseFile | undefined
+  for (const candidate of candidates) {
+    const version = candidate.version
+
+    debug(`check ${version} satisfies ${versionSpec}`)
+    if (
+      semver.satisfies(version, versionSpec) &&
+      (!stable || candidate.stable === stable)
+    ) {
+      file = candidate.files.find(item => {
+        debug(
+          `${item.arch}===${archFilter} && ${item.platform}===${platFilter}`
+        )
+
+        let chk = item.arch === archFilter && item.platform === platFilter
+        if (chk && item.platform_version) {
+          const osVersion = module.exports._getOsVersion()
+
+          if (osVersion === item.platform_version) {
+            chk = true
+          } else {
+            chk = semver.satisfies(osVersion, item.platform_version)
+          }
+        }
+
+        return chk
+      })
+
+      if (file) {
+        debug(`matched ${candidate.version}`)
+        match = candidate
+        break
+      }
+    }
+  }
+
+  if (match && file) {
+    // clone since we're mutating the file list to be only the file that matches
+    result = Object.assign({}, match)
+    result.files = [file]
+  }
+
+  return result
+}
+
+export function _getOsVersion(): string {
+  // TODO: add windows and other linux, arm variants
+  // right now filtering on version is only an ubuntu and macos scenario for tools we build for hosted (python)
+  const plat = os.platform()
+  let version = ''
+
+  if (plat === 'darwin') {
+    version = cp.execSync('sw_vers -productVersion').toString()
+  } else if (plat === 'linux') {
+    // lsb_release process not in some containers, readfile
+    // Run cat /etc/lsb-release
+    // DISTRIB_ID=Ubuntu
+    // DISTRIB_RELEASE=18.04
+    // DISTRIB_CODENAME=bionic
+    // DISTRIB_DESCRIPTION="Ubuntu 18.04.4 LTS"
+    const lsbContents = module.exports._readLinuxVersionFile()
+    if (lsbContents) {
+      const lines = lsbContents.split('\n')
+      for (const line of lines) {
+        const parts = line.split('=')
+        if (parts.length === 2 && parts[0].trim() === 'DISTRIB_RELEASE') {
+          version = parts[1].trim()
+          break
+        }
+      }
+    }
+  }
+
+  return version
+}
+
+export function _readLinuxVersionFile(): string {
+  const lsbFile = '/etc/lsb-release'
+  let contents = ''
+
+  if (fs.existsSync(lsbFile)) {
+    contents = fs.readFileSync(lsbFile).toString()
+  }
+
+  return contents
+}
--- a/packages/tool-cache/src/tool-cache.ts
+++ b/packages/tool-cache/src/tool-cache.ts
@ -1,6 +1,7 @@
 import * as core from '@actions/core'
 import * as io from '@actions/io'
 import * as fs from 'fs'
+import * as mm from './manifest'
 import * as os from 'os'
 import * as path from 'path'
 import * as httpm from '@actions/http-client'
@ -12,6 +13,7 @@ import {exec} from '@actions/exec/lib/exec'
 import {ExecOptions} from '@actions/exec/lib/interfaces'
 import {ok} from 'assert'
 import {RetryHelper} from './retry-helper'
+import {IHeaders} from '@actions/http-client/interfaces'

 export class HTTPError extends Error {
  constructor(readonly httpStatusCode: number | undefined) {
@ -28,11 +30,13 @@ const userAgent = 'actions/tool-cache'
 *
 * @param url       url of tool to download
 * @param dest      path to download tool
+ * @param auth      authorization header
 * @returns         path to downloaded tool
 */
 export async function downloadTool(
  url: string,
-  dest?: string
+  dest?: string,
+  auth?: string
 ): Promise<string> {
  dest = dest || path.join(_getTempDirectory(), uuidV4())
  await io.mkdirP(path.dirname(dest))
@ -51,7 +55,7 @@ export async function downloadTool(
  const retryHelper = new RetryHelper(maxAttempts, minSeconds, maxSeconds)
  return await retryHelper.execute(
    async () => {
-      return await downloadToolAttempt(url, dest || '')
+      return await downloadToolAttempt(url, dest || '', auth)
    },
    (err: Error) => {
      if (err instanceof HTTPError && err.httpStatusCode) {
@ -71,7 +75,11 @@ export async function downloadTool(
  )
 }

-async function downloadToolAttempt(url: string, dest: string): Promise<string> {
+async function downloadToolAttempt(
+  url: string,
+  dest: string,
+  auth?: string
+): Promise<string> {
  if (fs.existsSync(dest)) {
    throw new Error(`Destination file path ${dest} already exists`)
  }
@ -80,7 +88,16 @@ async function downloadToolAttempt(url: string, dest: string): Promise<string> {
  const http = new httpm.HttpClient(userAgent, [], {
    allowRetries: false
  })
-  const response: httpm.HttpClientResponse = await http.get(url)
+
+  let headers: IHeaders | undefined
+  if (auth) {
+    core.debug('set auth')
+    headers = {
+      authorization: auth
+    }
+  }
+
+  const response: httpm.HttpClientResponse = await http.get(url, headers)
  if (response.message.statusCode !== 200) {
    const err = new HTTPError(response.message.statusCode)
    core.debug(
@ -202,7 +219,7 @@ export async function extract7z(
 export async function extractTar(
  file: string,
  dest?: string,
-  flags: string = 'xz'
+  flags: string | string[] = 'xz'
 ): Promise<string> {
  if (!file) {
    throw new Error("parameter 'file' is required")
@ -226,7 +243,12 @@ export async function extractTar(
  const isGnuTar = versionOutput.toUpperCase().includes('GNU TAR')

  // Initialize args
-  const args = [flags]
+  let args: string[]
+  if (flags instanceof Array) {
+    args = flags
+  } else {
+    args = [flags]
+  }

  if (core.isDebug() && !flags.includes('v')) {
    args.push('-v')
@ -463,6 +485,92 @@ export function findAllVersions(toolName: string, arch?: string): string[] {
  return versions
 }

+// versions-manifest
+//
+// typical pattern of a setup-* action that supports JIT would be:
+// 1. resolve semver against local cache
+//
+// 2. if no match, download
+//   a. query versions manifest to match
+//   b. if no match, fall back to source if exists (tool distribution)
+//   c. with download url, download, install and preprent path
+
+export type IToolRelease = mm.IToolRelease
+export type IToolReleaseFile = mm.IToolReleaseFile
+
+interface GitHubTreeItem {
+  path: string
+  size: string
+  url: string
+}
+
+interface GitHubTree {
+  tree: GitHubTreeItem[]
+  truncated: boolean
+}
+
+export async function getManifestFromRepo(
+  owner: string,
+  repo: string,
+  auth?: string,
+  branch = 'master'
+): Promise<IToolRelease[]> {
+  let releases: IToolRelease[] = []
+  const treeUrl = `https://api.github.com/repos/${owner}/${repo}/git/trees/${branch}`
+
+  const http: httpm.HttpClient = new httpm.HttpClient('tool-cache')
+  const headers: IHeaders = {}
+  if (auth) {
+    core.debug('set auth')
+    headers.authorization = auth
+  }
+
+  const response = await http.getJson<GitHubTree>(treeUrl, headers)
+  if (!response.result) {
+    return releases
+  }
+
+  let manifestUrl = ''
+  for (const item of response.result.tree) {
+    if (item.path === 'versions-manifest.json') {
+      manifestUrl = item.url
+      break
+    }
+  }
+
+  headers['accept'] = 'application/vnd.github.VERSION.raw'
+  let versionsRaw = await (await http.get(manifestUrl, headers)).readBody()
+
+  if (versionsRaw) {
+    // shouldn't be needed but protects against invalid json saved with BOM
+    versionsRaw = versionsRaw.replace(/^\uFEFF/, '')
+    try {
+      releases = JSON.parse(versionsRaw)
+    } catch {
+      core.debug('Invalid json')
+    }
+  }
+
+  return releases
+}
+
+export async function findFromManifest(
+  versionSpec: string,
+  stable: boolean,
+  manifest: IToolRelease[],
+  archFilter: string = os.arch()
+): Promise<IToolRelease | undefined> {
+  // wrap the internal impl
+  const match: mm.IToolRelease | undefined = await mm._findMatch(
+    versionSpec,
+    stable,
+    manifest,
+    archFilter
+  )
+
+  return match
+}
+
 async function _createExtractFolder(dest?: string): Promise<string> {
  if (!dest) {
    // create a temp dir