fallback to REST API to download repo

.github/workflows/test.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
       # Clone this repo
       - name: Checkout
-        uses: actions/checkout@v1 # todo: switch to V2
+        uses: actions/checkout@v2-beta
 
       # Basic checkout
       - name: Basic checkout
@@ -81,3 +81,24 @@ jobs:
       - name: Verify LFS
         shell: bash
         run: __test__/verify-lfs.sh
+
+  test-job-container:
+    runs-on: ubuntu-latest
+    container: pstauffer/curl:latest
+    steps:
+      # Clone this repo
+      # todo: after v2-beta contains the latest changes, switch this to "uses: actions/checkout@v2-beta". Also check if can switch to "alpine:latest"
+      - name: Checkout
+        run: |
+          curl --location --user token:${{ github.token }} --output checkout.tar.gz https://api.github.com/repos/actions/checkout/tarball/${{ github.sha }}
+          tar -xzf checkout.tar.gz
+          mv */* ./
+
+      # Basic checkout
+      - name: Basic checkout
+        uses: ./
+        with:
+          ref: test-data/v2/basic
+          path: basic
+      - name: Verify basic
+        run: __test__/verify-basic.sh container

__test__/retry-helper.test.ts

@@ -0,0 +1,88 @@
+const mockCore = jest.genMockFromModule('@actions/core') as any
+mockCore.info = (message: string) => {
+  info.push(message)
+}
+let info: string[]
+let retryHelper: any
+
+describe('retry-helper tests', () => {
+  beforeAll(() => {
+    // Mocks
+    jest.setMock('@actions/core', mockCore)
+
+    // Now import
+    const retryHelperModule = require('../lib/retry-helper')
+    retryHelper = new retryHelperModule.RetryHelper(3, 0, 0)
+  })
+
+  beforeEach(() => {
+    // Reset info
+    info = []
+  })
+
+  afterAll(() => {
+    // Reset modules
+    jest.resetModules()
+  })
+
+  it('first attempt succeeds', async () => {
+    const actual = await retryHelper.execute(async () => {
+      return 'some result'
+    })
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(0)
+  })
+
+  it('second attempt succeeds', async () => {
+    let attempts = 0
+    const actual = await retryHelper.execute(() => {
+      if (++attempts == 1) {
+        throw new Error('some error')
+      }
+
+      return Promise.resolve('some result')
+    })
+    expect(attempts).toBe(2)
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(2)
+    expect(info[0]).toBe('some error')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+
+  it('third attempt succeeds', async () => {
+    let attempts = 0
+    const actual = await retryHelper.execute(() => {
+      if (++attempts < 3) {
+        throw new Error(`some error ${attempts}`)
+      }
+
+      return Promise.resolve('some result')
+    })
+    expect(attempts).toBe(3)
+    expect(actual).toBe('some result')
+    expect(info).toHaveLength(4)
+    expect(info[0]).toBe('some error 1')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+    expect(info[2]).toBe('some error 2')
+    expect(info[3]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+
+  it('all attempts fail succeeds', async () => {
+    let attempts = 0
+    let error: Error = (null as unknown) as Error
+    try {
+      await retryHelper.execute(() => {
+        throw new Error(`some error ${++attempts}`)
+      })
+    } catch (err) {
+      error = err
+    }
+    expect(error.message).toBe('some error 3')
+    expect(attempts).toBe(3)
+    expect(info).toHaveLength(4)
+    expect(info[0]).toBe('some error 1')
+    expect(info[1]).toMatch(/Waiting .+ seconds before trying again/)
+    expect(info[2]).toBe('some error 2')
+    expect(info[3]).toMatch(/Waiting .+ seconds before trying again/)
+  })
+})

__test__/verify-basic.sh

@@ -1,10 +1,24 @@
-#!/bin/bash
+#!/bin/sh
 
 if [ ! -f "./basic/basic-file.txt" ]; then
     echo "Expected basic file does not exist"
     exit 1
 fi
 
-# Verify auth token
+if [ "$1" = "container" ]; then
-cd basic
+  # Verify no .git folder
-git fetch
+  if [ -d "./basic/.git" ]; then
+    echo "Did not expect ./basic/.git folder to exist"
+    exit 1
+  fi
+else
+  # Verify .git folder
+  if [ ! -d "./basic/.git" ]; then
+    echo "Expected ./basic/.git folder to exist"
+    exit 1
+  fi
+
+  # Verify auth token
+  cd basic
+  git fetch --depth=1
+fi

package-lock.json

@@ -15,11 +15,11 @@
       "integrity": "sha512-nvFkxwiicvpzNiCBF4wFBDfnBvi7xp/as7LE1hBxBxKG2L29+gkIPBiLKMVORL+Hg3JNf07AKRfl0V5djoypjQ=="
     },
     "@actions/github": {
-      "version": "1.1.0",
+      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/github/-/github-1.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/@actions/github/-/github-2.0.0.tgz",
-      "integrity": "sha512-cHf6PyoNMdei13jEdGPhKprIMFmjVVW/dnM5/9QmQDJ1ZTaGVyezUSCUIC/ySNLRvDUpeFwPYMdThSEJldSbUw==",
+      "integrity": "sha512-sNpZ5dJyJyfJIO5lNYx8r/Gha4Tlm8R0MLO2cBkGdOnAAEn3t1M/MHVcoBhY/VPfjGVe5RNAUPz+6INrViiUPA==",
       "requires": {
-        "@octokit/graphql": "^2.0.1",
+        "@octokit/graphql": "^4.3.1",
         "@octokit/rest": "^16.15.0"
       }
     },
@@ -28,6 +28,26 @@
       "resolved": "https://registry.npmjs.org/@actions/io/-/io-1.0.1.tgz",
       "integrity": "sha512-rhq+tfZukbtaus7xyUtwKfuiCRXd1hWSfmJNEpFgBQJ4woqPEpsBw04awicjwz9tyG2/MVhAEMfVn664Cri5zA=="
     },
+    "@actions/tool-cache": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-1.1.2.tgz",
+      "integrity": "sha512-IJczPaZr02ECa3Lgws/TJEVco9tjOujiQSZbO3dHuXXjhd5vrUtfOgGwhmz3/f97L910OraPZ8SknofUk6RvOQ==",
+      "requires": {
+        "@actions/core": "^1.1.0",
+        "@actions/exec": "^1.0.1",
+        "@actions/io": "^1.0.1",
+        "semver": "^6.1.0",
+        "typed-rest-client": "^1.4.0",
+        "uuid": "^3.3.2"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
+        }
+      }
+    },
     "@babel/code-frame": {
       "version": "7.5.5",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
@@ -578,72 +598,56 @@
       }
     },
     "@octokit/endpoint": {
-      "version": "5.4.0",
+      "version": "5.5.1",
-      "resolved": "https://registry.npmjs.org/@octokit/endpoint/-/endpoint-5.4.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/endpoint/-/endpoint-5.5.1.tgz",
-      "integrity": "sha512-DWTNgEKg5KXzvNjKTzcFTnkZiL7te6pQxxumvxPjyjDpcY5V3xzywnNu1WVqySY3Ct1flF/kAoyDdZos6acq3Q==",
+      "integrity": "sha512-nBFhRUb5YzVTCX/iAK1MgQ4uWo89Gu0TH00qQHoYRCsE12dWcG1OiLd7v2EIo2+tpUKPMOQ62QFy9hy9Vg2ULg==",
       "requires": {
+        "@octokit/types": "^2.0.0",
         "is-plain-object": "^3.0.0",
         "universal-user-agent": "^4.0.0"
-      },
-      "dependencies": {
-        "universal-user-agent": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-4.0.0.tgz",
-          "integrity": "sha512-eM8knLpev67iBDizr/YtqkJsF3GK8gzDc6st/WKzrTuPtcsOKW/0IdL4cnMBsU69pOx0otavLWBDGTwg+dB0aA==",
-          "requires": {
-            "os-name": "^3.1.0"
-          }
-        }
       }
     },
     "@octokit/graphql": {
-      "version": "2.1.3",
+      "version": "4.3.1",
-      "resolved": "https://registry.npmjs.org/@octokit/graphql/-/graphql-2.1.3.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/graphql/-/graphql-4.3.1.tgz",
-      "integrity": "sha512-XoXJqL2ondwdnMIW3wtqJWEwcBfKk37jO/rYkoxNPEVeLBDGsGO1TCWggrAlq3keGt/O+C/7VepXnukUxwt5vA==",
+      "integrity": "sha512-hCdTjfvrK+ilU2keAdqNBWOk+gm1kai1ZcdjRfB30oA3/T6n53UVJb7w0L5cR3/rhU91xT3HSqCd+qbvH06yxA==",
       "requires": {
-        "@octokit/request": "^5.0.0",
+        "@octokit/request": "^5.3.0",
-        "universal-user-agent": "^2.0.3"
+        "@octokit/types": "^2.0.0",
+        "universal-user-agent": "^4.0.0"
       }
     },
     "@octokit/request": {
-      "version": "5.1.0",
+      "version": "5.3.1",
-      "resolved": "https://registry.npmjs.org/@octokit/request/-/request-5.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/request/-/request-5.3.1.tgz",
-      "integrity": "sha512-I15T9PwjFs4tbWyhtFU2Kq7WDPidYMvRB7spmxoQRZfxSmiqullG+Nz+KbSmpkfnlvHwTr1e31R5WReFRKMXjg==",
+      "integrity": "sha512-5/X0AL1ZgoU32fAepTfEoggFinO3rxsMLtzhlUX+RctLrusn/CApJuGFCd0v7GMFhF+8UiCsTTfsu7Fh1HnEJg==",
       "requires": {
-        "@octokit/endpoint": "^5.1.0",
+        "@octokit/endpoint": "^5.5.0",
         "@octokit/request-error": "^1.0.1",
+        "@octokit/types": "^2.0.0",
         "deprecation": "^2.0.0",
         "is-plain-object": "^3.0.0",
         "node-fetch": "^2.3.0",
         "once": "^1.4.0",
         "universal-user-agent": "^4.0.0"
-      },
-      "dependencies": {
-        "universal-user-agent": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-4.0.0.tgz",
-          "integrity": "sha512-eM8knLpev67iBDizr/YtqkJsF3GK8gzDc6st/WKzrTuPtcsOKW/0IdL4cnMBsU69pOx0otavLWBDGTwg+dB0aA==",
-          "requires": {
-            "os-name": "^3.1.0"
-          }
-        }
       }
     },
     "@octokit/request-error": {
-      "version": "1.0.4",
+      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@octokit/request-error/-/request-error-1.0.4.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/request-error/-/request-error-1.2.0.tgz",
-      "integrity": "sha512-L4JaJDXn8SGT+5G0uX79rZLv0MNJmfGa4vb4vy1NnpjSnWDLJRy6m90udGwvMmavwsStgbv2QNkPzzTCMmL+ig==",
+      "integrity": "sha512-DNBhROBYjjV/I9n7A8kVkmQNkqFAMem90dSxqvPq57e2hBr7mNTX98y3R2zDpqMQHVRpBDjsvsfIGgBzy+4PAg==",
       "requires": {
+        "@octokit/types": "^2.0.0",
         "deprecation": "^2.0.0",
         "once": "^1.4.0"
       }
     },
     "@octokit/rest": {
-      "version": "16.33.0",
+      "version": "16.35.0",
-      "resolved": "https://registry.npmjs.org/@octokit/rest/-/rest-16.33.0.tgz",
+      "resolved": "https://registry.npmjs.org/@octokit/rest/-/rest-16.35.0.tgz",
-      "integrity": "sha512-t4jMR+odsfooQwmHiREoTQixVTX2DfdbSaO+lKrW9R5XBuk0DW+5T/JdfwtxAGUAHgvDDpWY/NVVDfEPTzxD6g==",
+      "integrity": "sha512-9ShFqYWo0CLoGYhA1FdtdykJuMzS/9H6vSbbQWDX4pWr4p9v+15MsH/wpd/3fIU+tSxylaNO48+PIHqOkBRx3w==",
       "requires": {
-        "@octokit/request": "^5.0.0",
+        "@octokit/request": "^5.2.0",
         "@octokit/request-error": "^1.0.2",
         "atob-lite": "^2.0.0",
         "before-after-hook": "^2.0.0",
@@ -655,16 +659,14 @@
         "octokit-pagination-methods": "^1.1.0",
         "once": "^1.4.0",
         "universal-user-agent": "^4.0.0"
+      }
     },
-      "dependencies": {
+    "@octokit/types": {
-        "universal-user-agent": {
+      "version": "2.0.2",
-          "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@octokit/types/-/types-2.0.2.tgz",
-          "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-4.0.0.tgz",
+      "integrity": "sha512-StASIL2lgT3TRjxv17z9pAqbnI7HGu9DrJlg3sEBFfCLaMEqp+O3IQPUF6EZtQ4xkAu2ml6kMBBCtGxjvmtmuQ==",
-          "integrity": "sha512-eM8knLpev67iBDizr/YtqkJsF3GK8gzDc6st/WKzrTuPtcsOKW/0IdL4cnMBsU69pOx0otavLWBDGTwg+dB0aA==",
       "requires": {
-            "os-name": "^3.1.0"
+        "@types/node": ">= 8"
-          }
-        }
       }
     },
     "@types/babel__core": {
@@ -757,8 +759,7 @@
     "@types/node": {
       "version": "12.7.12",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.12.tgz",
-      "integrity": "sha512-KPYGmfD0/b1eXurQ59fXD1GBzhSQfz6/lKBxkaHX9dKTzjXbK68Zt7yGUxUsCS1jeTy/8aL+d9JEr+S54mpkWQ==",
+      "integrity": "sha512-KPYGmfD0/b1eXurQ59fXD1GBzhSQfz6/lKBxkaHX9dKTzjXbK68Zt7yGUxUsCS1jeTy/8aL+d9JEr+S54mpkWQ=="
-      "dev": true
     },
     "@types/stack-utils": {
       "version": "1.0.1",
@@ -766,6 +767,15 @@
       "integrity": "sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==",
       "dev": true
     },
+    "@types/uuid": {
+      "version": "3.4.6",
+      "resolved": "https://registry.npmjs.org/@types/uuid/-/uuid-3.4.6.tgz",
+      "integrity": "sha512-cCdlC/1kGEZdEglzOieLDYBxHsvEOIg7kp/2FYyVR9Pxakq+Qf/inL3RKQ+PA8gOlI/NnL+fXmQH12nwcGzsHw==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/yargs": {
       "version": "13.0.3",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-13.0.3.tgz",
@@ -6603,6 +6613,11 @@
         "tslib": "^1.8.1"
       }
     },
+    "tunnel": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.4.tgz",
+      "integrity": "sha1-LTeFoVjBdMmhbcLARuxfxfF0IhM="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -6627,6 +6642,15 @@
         "prelude-ls": "~1.1.2"
       }
     },
+    "typed-rest-client": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/typed-rest-client/-/typed-rest-client-1.5.0.tgz",
+      "integrity": "sha512-DVZRlmsfnTjp6ZJaatcdyvvwYwbWvR4YDNFDqb+qdTxpvaVP99YCpBkA8rxsLtAPjBVoDe4fNsnMIdZTiPuKWg==",
+      "requires": {
+        "tunnel": "0.0.4",
+        "underscore": "1.8.3"
+      }
+    },
     "typescript": {
       "version": "3.6.4",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
@@ -6653,6 +6677,11 @@
         }
       }
     },
+    "underscore": {
+      "version": "1.8.3",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
+      "integrity": "sha1-Tz+1OxBuYJf8+ctBCfKl6b36UCI="
+    },
     "union-value": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
@@ -6666,11 +6695,11 @@
       }
     },
     "universal-user-agent": {
-      "version": "2.1.0",
+      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-2.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/universal-user-agent/-/universal-user-agent-4.0.0.tgz",
-      "integrity": "sha512-8itiX7G05Tu3mGDTdNY2fB4KJ8MgZLS54RdG6PkkfwMAavrXu1mV/lls/GABx9O3Rw4PnTtasxrvbMQoBYY92Q==",
+      "integrity": "sha512-eM8knLpev67iBDizr/YtqkJsF3GK8gzDc6st/WKzrTuPtcsOKW/0IdL4cnMBsU69pOx0otavLWBDGTwg+dB0aA==",
       "requires": {
-        "os-name": "^3.0.0"
+        "os-name": "^3.1.0"
       }
     },
     "unset-value": {
@@ -6753,8 +6782,7 @@
     "uuid": {
       "version": "3.3.3",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
-      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ==",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
-      "dev": true
     },
     "validate-npm-package-license": {
       "version": "3.0.4",

package.json

@@ -31,12 +31,15 @@
   "dependencies": {
     "@actions/core": "^1.1.3",
     "@actions/exec": "^1.0.1",
-    "@actions/github": "^1.1.0",
+    "@actions/github": "^2.0.0",
-    "@actions/io": "^1.0.1"
+    "@actions/io": "^1.0.1",
+    "@actions/tool-cache": "^1.1.2",
+    "uuid": "^3.3.3"
   },
   "devDependencies": {
     "@types/jest": "^24.0.23",
     "@types/node": "^12.7.12",
+    "@types/uuid": "^3.4.6",
     "@typescript-eslint/parser": "^2.8.0",
     "@zeit/ncc": "^0.20.5",
     "eslint": "^5.16.0",

src/git-command-manager.ts

@@ -3,8 +3,13 @@ import * as exec from '@actions/exec'
 import * as fshelper from './fs-helper'
 import * as io from '@actions/io'
 import * as path from 'path'
+import * as retryHelper from './retry-helper'
 import {GitVersion} from './git-version'
 
+// Auth header not supported before 2.9
+// Wire protocol v2 not supported before 2.18
+export const MinimumGitVersion = new GitVersion('2.18')
+
 export interface IGitCommandManager {
   branchDelete(remote: boolean, branch: string): Promise<void>
   branchExists(remote: boolean, pattern: string): Promise<boolean>
@@ -150,22 +155,10 @@ class GitCommandManager {
       args.push(arg)
     }
 
-    let attempt = 1
+    const that = this
-    const maxAttempts = 3
+    await retryHelper.execute(async () => {
-    while (attempt <= maxAttempts) {
+      await that.execGit(args)
-      const allowAllExitCodes = attempt < maxAttempts
+    })
-      const output = await this.execGit(args, allowAllExitCodes)
-      if (output.exitCode === 0) {
-        break
-      }
-
-      const seconds = this.getRandomIntInclusive(1, 10)
-      core.warning(
-        `Git fetch failed with exit code ${output.exitCode}. Waiting ${seconds} seconds before trying again.`
-      )
-      await this.sleep(seconds * 1000)
-      attempt++
-    }
   }
 
   getWorkingDirectory(): string {
@@ -188,22 +181,10 @@ class GitCommandManager {
   async lfsFetch(ref: string): Promise<void> {
     const args = ['lfs', 'fetch', 'origin', ref]
 
-    let attempt = 1
+    const that = this
-    const maxAttempts = 3
+    await retryHelper.execute(async () => {
-    while (attempt <= maxAttempts) {
+      await that.execGit(args)
-      const allowAllExitCodes = attempt < maxAttempts
+    })
-      const output = await this.execGit(args, allowAllExitCodes)
-      if (output.exitCode === 0) {
-        break
-      }
-
-      const seconds = this.getRandomIntInclusive(1, 10)
-      core.warning(
-        `Git lfs fetch failed with exit code ${output.exitCode}. Waiting ${seconds} seconds before trying again.`
-      )
-      await this.sleep(seconds * 1000)
-      attempt++
-    }
   }
 
   async lfsInstall(): Promise<void> {
@@ -338,13 +319,9 @@ class GitCommandManager {
     }
 
     // Minimum git version
-    // Note:
+    if (!gitVersion.checkMinimum(MinimumGitVersion)) {
-    // - Auth header not supported before 2.9
-    // - Wire protocol v2 not supported before 2.18
-    const minimumGitVersion = new GitVersion('2.18')
-    if (!gitVersion.checkMinimum(minimumGitVersion)) {
       throw new Error(
-        `Minimum required git version is ${minimumGitVersion}. Your git ('${this.gitPath}') is ${gitVersion}`
+        `Minimum required git version is ${MinimumGitVersion}. Your git ('${this.gitPath}') is ${gitVersion}`
       )
     }
 
@@ -381,16 +358,6 @@ class GitCommandManager {
     core.debug(`Set git useragent to: ${gitHttpUserAgent}`)
     this.gitEnv['GIT_HTTP_USER_AGENT'] = gitHttpUserAgent
   }
-
-  private getRandomIntInclusive(minimum: number, maximum: number): number {
-    minimum = Math.floor(minimum)
-    maximum = Math.floor(maximum)
-    return Math.floor(Math.random() * (maximum - minimum + 1)) + minimum
-  }
-
-  private async sleep(milliseconds): Promise<void> {
-    return new Promise(resolve => setTimeout(resolve, milliseconds))
-  }
 }
 
 class GitOutput {

src/git-source-provider.ts

@@ -6,6 +6,7 @@ import * as gitCommandManager from './git-command-manager'
 import * as io from '@actions/io'
 import * as path from 'path'
 import * as refHelper from './ref-helper'
+import * as githubApiHelper from './github-api-helper'
 import {IGitCommandManager} from './git-command-manager'
 
 const authConfigKey = `http.https://github.com/.extraheader`
@@ -23,6 +24,7 @@ export interface ISourceSettings {
 }
 
 export async function getSource(settings: ISourceSettings): Promise<void> {
+  // Repository URL
   core.info(
     `Syncing repository: ${settings.repositoryOwner}/${settings.repositoryName}`
   )
@@ -30,6 +32,13 @@ export async function getSource(settings: ISourceSettings): Promise<void> {
     settings.repositoryOwner
   )}/${encodeURIComponent(settings.repositoryName)}`
 
+  // Set intra-task state for cleanup
+  coreCommand.issueCommand(
+    'save-state',
+    {name: 'repositoryPath'},
+    settings.repositoryPath
+  )
+
   // Remove conflicting file path
   if (fsHelper.fileExistsSync(settings.repositoryPath)) {
     await io.rmRF(settings.repositoryPath)
@@ -43,30 +52,33 @@ export async function getSource(settings: ISourceSettings): Promise<void> {
   }
 
   // Git command manager
-  core.info(`Working directory is '${settings.repositoryPath}'`)
+  const git = await getGitCommandManager(settings)
-  const git = await gitCommandManager.CreateCommandManager(
-    settings.repositoryPath,
-    settings.lfs
-  )
 
-  // Try prepare existing directory, otherwise recreate
+  // Prepare existing directory, otherwise recreate
-  if (
+  if (isExisting) {
-    isExisting &&
+    await prepareExistingDirectory(
-    !(await tryPrepareExistingDirectory(
       git,
       settings.repositoryPath,
       repositoryUrl,
       settings.clean
-    ))
+    )
-  ) {
-    // Delete the contents of the directory. Don't delete the directory itself
-    // since it may be the current working directory.
-    core.info(`Deleting the contents of '${settings.repositoryPath}'`)
-    for (const file of await fs.promises.readdir(settings.repositoryPath)) {
-      await io.rmRF(path.join(settings.repositoryPath, file))
-    }
   }
 
+  if (!git) {
+    // Downloading using REST API
+    core.info(`The repository will be downloaded using the GitHub REST API`)
+    core.info(
+      `To create a local Git repository instead, add Git ${gitCommandManager.MinimumGitVersion} or higher to the PATH`
+    )
+    await githubApiHelper.downloadRepository(
+      settings.accessToken,
+      settings.repositoryOwner,
+      settings.repositoryName,
+      settings.ref,
+      settings.commit,
+      settings.repositoryPath
+    )
+  } else {
     // Initialize the repository
     if (
       !fsHelper.directoryExistsSync(path.join(settings.repositoryPath, '.git'))
@@ -122,13 +134,7 @@ export async function getSource(settings: ISourceSettings): Promise<void> {
 
     // Dump some info about the checked out commit
     await git.log1()
-
+  }
-  // Set intra-task state for cleanup
-  coreCommand.issueCommand(
-    'save-state',
-    {name: 'repositoryPath'},
-    settings.repositoryPath
-  )
 }
 
 export async function cleanup(repositoryPath: string): Promise<void> {
@@ -146,20 +152,46 @@ export async function cleanup(repositoryPath: string): Promise<void> {
   await removeGitConfig(git, authConfigKey)
 }
 
-async function tryPrepareExistingDirectory(
+async function getGitCommandManager(
+  settings: ISourceSettings
+): Promise<IGitCommandManager> {
+  core.info(`Working directory is '${settings.repositoryPath}'`)
+  let git = (null as unknown) as IGitCommandManager
+  try {
+    return await gitCommandManager.CreateCommandManager(
+      settings.repositoryPath,
+      settings.lfs
+    )
+  } catch (err) {
+    // Git is required for LFS
+    if (settings.lfs) {
+      throw err
+    }
+
+    // Otherwise fallback to REST API
+    return (null as unknown) as IGitCommandManager
+  }
+}
+
+async function prepareExistingDirectory(
   git: IGitCommandManager,
   repositoryPath: string,
   repositoryUrl: string,
   clean: boolean
-): Promise<boolean> {
+): Promise<void> {
+  let remove = false
+
+  // Check whether using git or REST API
+  if (!git) {
+    remove = true
+  }
   // Fetch URL does not match
-  if (
+  else if (
     !fsHelper.directoryExistsSync(path.join(repositoryPath, '.git')) ||
     repositoryUrl !== (await git.tryGetFetchUrl())
   ) {
-    return false
+    remove = true
-  }
+  } else {
-
     // Delete any index.lock and shallow.lock left by a previously canceled run or crashed git process
     const lockPaths = [
       path.join(repositoryPath, '.git', 'index.lock'),
@@ -190,35 +222,40 @@ async function tryPrepareExistingDirectory(
       for (const branch of branches) {
         await git.branchDelete(true, branch)
       }
-  } catch (error) {
-    core.warning(
-      `Unable to prepare the existing repository. The repository will be recreated instead.`
-    )
-    return false
-  }
 
       // Clean
       if (clean) {
-    let succeeded = true
         if (!(await git.tryClean())) {
           core.debug(
             `The clean command failed. This might be caused by: 1) path too long, 2) permission issue, or 3) file in use. For futher investigation, manually run 'git clean -ffdx' on the directory '${repositoryPath}'.`
           )
-      succeeded = false
+          remove = true
         } else if (!(await git.tryReset())) {
-      succeeded = false
+          remove = true
         }
 
-    if (!succeeded) {
+        if (remove) {
           core.warning(
             `Unable to clean or reset the repository. The repository will be recreated instead.`
           )
         }
-
+      }
-    return succeeded
+    } catch (error) {
+      core.warning(
+        `Unable to prepare the existing repository. The repository will be recreated instead.`
+      )
+      remove = true
+    }
   }
 
-  return true
+  if (remove) {
+    // Delete the contents of the directory. Don't delete the directory itself
+    // since it might be the current working directory.
+    core.info(`Deleting the contents of '${repositoryPath}'`)
+    for (const file of await fs.promises.readdir(repositoryPath)) {
+      await io.rmRF(path.join(repositoryPath, file))
+    }
+  }
 }
 
 async function removeGitConfig(

src/github-api-helper.ts

@@ -0,0 +1,88 @@
+import * as assert from 'assert'
+import * as core from '@actions/core'
+import * as fs from 'fs'
+import * as github from '@actions/github'
+import * as io from '@actions/io'
+import * as path from 'path'
+import * as retryHelper from './retry-helper'
+import * as toolCache from '@actions/tool-cache'
+import {default as uuid} from 'uuid/v4'
+import {ReposGetArchiveLinkParams} from '@octokit/rest'
+
+const IS_WINDOWS = process.platform === 'win32'
+
+export async function downloadRepository(
+  accessToken: string,
+  owner: string,
+  repo: string,
+  ref: string,
+  commit: string,
+  repositoryPath: string
+): Promise<void> {
+  // Download the archive
+  let archiveData = await retryHelper.execute(async () => {
+    core.info('Downloading the archive')
+    return await downloadArchive(accessToken, owner, repo, ref, commit)
+  })
+
+  // Write archive to disk
+  core.info('Writing archive to disk')
+  const uniqueId = uuid()
+  const archivePath = path.join(repositoryPath, `${uniqueId}.tar.gz`)
+  await fs.promises.writeFile(archivePath, archiveData)
+  archiveData = Buffer.from('') // Free memory
+
+  // Extract archive
+  core.info('Extracting the archive')
+  const extractPath = path.join(repositoryPath, uniqueId)
+  await io.mkdirP(extractPath)
+  if (IS_WINDOWS) {
+    await toolCache.extractZip(archivePath, extractPath)
+  } else {
+    await toolCache.extractTar(archivePath, extractPath)
+  }
+  io.rmRF(archivePath)
+
+  // Determine the path of the repository content. The archive contains
+  // a top-level folder and the repository content is inside.
+  const archiveFileNames = await fs.promises.readdir(extractPath)
+  assert.ok(
+    archiveFileNames.length == 1,
+    'Expected exactly one directory inside archive'
+  )
+  const archiveVersion = archiveFileNames[0] // The top-level folder name includes the short SHA
+  core.info(`Resolved version ${archiveVersion}`)
+  const tempRepositoryPath = path.join(extractPath, archiveVersion)
+
+  // Move the files
+  for (const fileName of await fs.promises.readdir(tempRepositoryPath)) {
+    const sourcePath = path.join(tempRepositoryPath, fileName)
+    const targetPath = path.join(repositoryPath, fileName)
+    await io.mv(sourcePath, targetPath)
+  }
+  io.rmRF(extractPath)
+}
+
+async function downloadArchive(
+  accessToken: string,
+  owner: string,
+  repo: string,
+  ref: string,
+  commit: string
+): Promise<Buffer> {
+  const octokit = new github.GitHub(accessToken)
+  const params: ReposGetArchiveLinkParams = {
+    owner: owner,
+    repo: repo,
+    archive_format: IS_WINDOWS ? 'zipball' : 'tarball',
+    ref: commit || ref
+  }
+  const response = await octokit.repos.getArchiveLink(params)
+  if (response.status != 200) {
+    throw new Error(
+      `Unexpected response from GitHub API. Status: '${response.status}'`
+    )
+  }
+
+  return Buffer.from(response.data) // response.data is ArrayBuffer
+}

src/retry-helper.ts

@@ -0,0 +1,58 @@
+import * as core from '@actions/core'
+
+const defaultMaxAttempts = 3
+const defaultMinSeconds = 10
+const defaultMaxSeconds = 20
+
+export class RetryHelper {
+  private maxAttempts: number
+  private minSeconds: number
+  private maxSeconds: number
+
+  constructor(
+    maxAttempts: number = defaultMaxAttempts,
+    minSeconds: number = defaultMinSeconds,
+    maxSeconds: number = defaultMaxSeconds
+  ) {
+    this.maxAttempts = maxAttempts
+    this.minSeconds = Math.floor(minSeconds)
+    this.maxSeconds = Math.floor(maxSeconds)
+  }
+
+  async execute<T>(action: () => Promise<T>): Promise<T> {
+    let attempt = 1
+    while (attempt < this.maxAttempts) {
+      // Try
+      try {
+        return await action()
+      } catch (err) {
+        core.info(err.message)
+      }
+
+      // Sleep
+      const seconds = this.getSleepAmount()
+      core.info(`Waiting ${seconds} seconds before trying again`)
+      await this.sleep(seconds)
+      attempt++
+    }
+
+    // Last attempt
+    return await action()
+  }
+
+  private getSleepAmount(): number {
+    return (
+      Math.floor(Math.random() * (this.maxSeconds - this.minSeconds + 1)) +
+      this.minSeconds
+    )
+  }
+
+  private async sleep(seconds: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, seconds * 1000))
+  }
+}
+
+export async function execute<T>(action: () => Promise<T>): Promise<T> {
+  const retryHelper = new RetryHelper()
+  return await retryHelper.execute(action)
+}