Check Git version during install (#656)

package.json

@@ -51,7 +51,9 @@
   "dependencies": {
     "chalk": "^3.0.0",
     "ci-info": "^2.0.0",
+    "compare-versions": "^3.5.1",
     "cosmiconfig": "^6.0.0",
+    "find-versions": "^3.2.0",
     "opencollective-postinstall": "^2.0.2",
     "pkg-dir": "^4.2.0",
     "please-upgrade-node": "^3.2.0",

src/installer/__tests__/checkGitVersion.ts

@@ -0,0 +1,26 @@
+jest.mock('child_process')
+
+import cp from 'child_process'
+import { checkGitVersion } from '../checkGitVersion'
+
+describe('checkGitVersion', (): void => {
+  it('should throw an error if version <2.13.0', (): void => {
+    // eslint-disable-next-line
+    // @ts-ignore
+    cp.spawnSync.mockReturnValue({
+      status: 0,
+      stdout: Buffer.from('git version 2.12.0')
+    })
+    expect(() => checkGitVersion()).toThrowError()
+  })
+
+  it('should not throw an error if version >=2.13.0', (): void => {
+    // eslint-disable-next-line
+    // @ts-ignore
+    cp.spawnSync.mockReturnValue({
+      status: 0,
+      stdout: Buffer.from('git version 2.14.0')
+    })
+    expect(() => checkGitVersion()).not.toThrowError()
+  })
+})

src/installer/bin.ts

@@ -7,6 +7,7 @@ import { checkGitDirEnv } from '../checkGitDirEnv'
 import { debug } from '../debug'
 import { install, uninstall } from './'
 import { gitRevParse } from './gitRevParse'
+import { checkGitVersion } from './checkGitVersion'
 
 // Skip install if HUSKY_SKIP_INSTALL is true
 function checkSkipInstallEnv(): void {
@@ -78,7 +79,11 @@ function run(): void {
 
     debug(`Current working directory is ${process.cwd()}`)
 
-    if (action === 'install') checkSkipInstallEnv()
+    if (action === 'install') {
+      checkSkipInstallEnv()
+      checkGitVersion()
+    }
+
     const INIT_CWD = getInitCwdEnv()
     const userPkgDir = getUserPkgDir(INIT_CWD)
     checkGitDirEnv()

src/installer/checkGitVersion.ts

@@ -0,0 +1,17 @@
+import cp = require('child_process')
+import findVersions from 'find-versions'
+import compareVersions from 'compare-versions'
+
+export function checkGitVersion(): void {
+  const { status, stderr, stdout } = cp.spawnSync('git', ['--version'])
+
+  if (status !== 0) {
+    throw new Error(stderr.toString())
+  }
+
+  const [version] = findVersions(stdout.toString())
+
+  if (compareVersions(version, '2.13.0') === -1) {
+    throw new Error(`Husky requires Git >=2.13.0. Got v${version}.`)
+  }
+}