Check PATH before trying to patch

Author: stephan-gh

src/main/groovy/net/minecrell/gitpatcher/GitPatcher.groovy

@@ -22,6 +22,7 @@
 package net.minecrell.gitpatcher
 
 import net.minecrell.gitpatcher.task.UpdateSubmodulesTask
+import net.minecrell.gitpatcher.task.FindGitTask
 import net.minecrell.gitpatcher.task.patch.ApplyPatchesTask
 import net.minecrell.gitpatcher.task.patch.MakePatchesTask
 import org.gradle.api.Plugin
@@ -39,14 +40,15 @@ class GitPatcher implements Plugin<Project> {
             this.extension = extensions.create('patches', PatchExtension)
             extension.root = projectDir
 
-            task('updateSubmodules', type: UpdateSubmodulesTask)
-            task('applyPatches', type: ApplyPatchesTask) {
-                dependsOn 'updateSubmodules'
-            }
-            task('makePatches', type: MakePatchesTask)
+            task('findGit', type: FindGitTask)
+            task('updateSubmodules', type: UpdateSubmodulesTask, dependsOn: 'findGit')
+            task('applyPatches', type: ApplyPatchesTask, dependsOn: 'updateSubmodules')
+            task('makePatches', type: MakePatchesTask, dependsOn: 'findGit')
 
             afterEvaluate {
                 // Configure the settings from our extension
+                tasks.findGit.submodule = extension.submodule
+
                 configure([tasks.applyPatches, tasks.makePatches]) {
                     repo = extension.target
                     root = extension.root

src/main/groovy/net/minecrell/gitpatcher/task/FindGitTask.groovy

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2015, Minecrell <https://github.com/Minecrell>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package net.minecrell.gitpatcher.task
+
+import net.minecrell.gitpatcher.Git
+import org.gradle.api.DefaultTask
+import org.gradle.api.tasks.TaskAction
+
+class FindGitTask extends DefaultTask {
+
+    String submodule
+
+    @TaskAction
+    void findGit() {
+        def git = new Git(project.projectDir)
+        try {
+            def version = (git.version() as String).readLines().join(', ')
+            logger.lifecycle("Using $version for patching submodule $submodule.")
+        } catch (Throwable e) {
+            throw new AssertionError(
+                    'Failed to verify Git version. Make sure running the Gradle build in an environment where Git is in your PATH.', e);
+        }
+    }
+
+}