From 63adf8ca465761ad0b7066c0125331be46986c5b Mon Sep 17 00:00:00 2001
From: Matthew Grasmick <matt.grasmick@gmail.com>
Date: Wed, 31 May 2017 11:30:55 -0400
Subject: [PATCH] Fixes #1532: Add git version requirements.

---
 src/Robo/Commands/Deploy/DeployCommand.php |  3 +++
 src/Robo/Inspector/Inspector.php           | 18 ++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/src/Robo/Commands/Deploy/DeployCommand.php b/src/Robo/Commands/Deploy/DeployCommand.php
index 43f30e2f8..0c20f14a6 100644
--- a/src/Robo/Commands/Deploy/DeployCommand.php
+++ b/src/Robo/Commands/Deploy/DeployCommand.php
@@ -41,6 +41,9 @@ public function deploy($options = [
     'ignore-dirty' => FALSE,
     'dry-run' => FALSE,
   ]) {
+    if (!$this->getInspector()->isGitMinimumVersionSatisfied('2.0')) {
+      $this->logger->error("Your system does not meet BLT's requirements. Please update git to 2.0 or newer.");
+    }
     $this->checkDirty($options);
 
     if (!$options['tag'] && !$options['branch']) {
diff --git a/src/Robo/Inspector/Inspector.php b/src/Robo/Inspector/Inspector.php
index 5db74c02d..c92bf2b4e 100644
--- a/src/Robo/Inspector/Inspector.php
+++ b/src/Robo/Inspector/Inspector.php
@@ -340,6 +340,24 @@ public function commandExists($command) {
     return $exit_code == 0;
   }
 
+  /**
+   * Verifies that installed minimum git version is met.
+   *
+   * @param string $minimum_version
+   *   The minimum git version that is required.
+   *
+   * @return bool
+   *   TRUE if minimum version is satisfied.
+   *
+   */
+  public function isGitMinimumVersionSatisfied($minimum_version) {
+    exec("git --version | cut -d' ' -f3", $output, $exit_code);
+    if (version_compare($output[0], $minimum_version, '>=')) {
+      return TRUE;
+    }
+    return FALSE;
+  }
+
   /**
    * Gets the local behat configuration defined in local.yml.
    *