.

src/git-command-manager.ts

@@ -5,6 +5,10 @@ import * as io from '@actions/io'
 import * as path from 'path'
 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>
@@ -338,13 +342,9 @@ class GitCommandManager {
     }
 
     // Minimum git version
-    // Note:
-    // - 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)) {
+    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}`
       )
     }
 

src/git-source-provider.ts

@@ -79,6 +79,12 @@ export async function getSource(settings: ISourceSettings): Promise<void> {
   }
 
   if (!git || `${1}` == '1') {
+    core.info(
+      `Git version ${gitCommandManager.MinimumGitVersion} was not found in the PATH.`
+    )
+    core.info(
+      `Instead downloading the repository files using the GitHub REST API.`
+    )
     await githubApiHelper.downloadRepository(
       settings.accessToken,
       settings.repositoryOwner,

src/github-api-helper.ts

@@ -1,5 +1,13 @@
+import * as assert from 'assert'
+import * as core from '@actions/core'
+import * as exec from '@actions/exec'
+import * as fs from 'fs'
 import * as github from '@actions/github'
+import * as io from '@actions/io'
+import * as path from 'path'
 import {ReposGetArchiveLinkParams} from '@octokit/rest'
+import {defaultCoreCipherList} from 'constants'
+import {ExecOptions} from '@actions/exec/lib/interfaces'
 
 const IS_WINDOWS = process.platform === 'win32'
 
@@ -17,13 +25,21 @@ export async function downloadRepository(
     repo: repo,
     ref: ref
   }
+  // todo: retry
   const response = await octokit.repos.getArchiveLink(params)
   if (response.status != 200) {
     throw new Error(
-      `GitHub API call failed with response status '${response.status}': ${response.data}`
+      `Unexpected response from GitHub API. Status: '${response.status}'; Data: '${response.data}'`
     )
   }
   console.log(`status=${response.status}`)
   console.log(`headers=${JSON.stringify(response.headers)}`)
   console.log(`data=${JSON.stringify(typeof response.data)}`)
+  const runnerTemp = process.env['RUNNER_TEMP'] as string
+  assert.ok(runnerTemp, 'RUNNER_TEMP not defined')
+  const archiveFile = path.join(runnerTemp, 'checkout.tar.gz')
+  await fs.promises.writeFile(archiveFile, response.data)
+  await exec.exec(`tar -xzf "${archiveFile}"`, [], {
+    cwd: repositoryPath
+  } as ExecOptions)
 }