From 5cb164107f2860a721f15946760e7a3958ba75be Mon Sep 17 00:00:00 2001
From: Felix Angelov <felix@shorebird.dev>
Date: Mon, 7 Aug 2023 15:29:50 -0500
Subject: [PATCH] feat(shorebird_cli): add `revParse` to `Git` (#1051)

---
 packages/shorebird_cli/lib/src/git.dart       | 22 +++++++++
 packages/shorebird_cli/test/src/git_test.dart | 47 ++++++++++++++++++-
 2 files changed, 68 insertions(+), 1 deletion(-)

diff --git a/packages/shorebird_cli/lib/src/git.dart b/packages/shorebird_cli/lib/src/git.dart
index d334c76b0..598b7a728 100644
--- a/packages/shorebird_cli/lib/src/git.dart
+++ b/packages/shorebird_cli/lib/src/git.dart
@@ -68,4 +68,26 @@ class Git {
       );
     }
   }
+
+  /// Returns the revision of the git repository located at [directory].
+  Future<String> revParse({
+    required String revision,
+    required String directory,
+  }) async {
+    final arguments = ['rev-parse', '--verify', revision];
+    final result = await process.run(
+      executable,
+      arguments,
+      workingDirectory: directory,
+    );
+    if (result.exitCode != 0) {
+      throw ProcessException(
+        executable,
+        arguments,
+        '${result.stderr}',
+        result.exitCode,
+      );
+    }
+    return '${result.stdout}'.trim();
+  }
 }
diff --git a/packages/shorebird_cli/test/src/git_test.dart b/packages/shorebird_cli/test/src/git_test.dart
index 2c1be3cf6..89b8a8482 100644
--- a/packages/shorebird_cli/test/src/git_test.dart
+++ b/packages/shorebird_cli/test/src/git_test.dart
@@ -33,7 +33,12 @@ void main() {
       git = runWithOverrides(Git.new);
 
       when(
-        () => process.run(any(), any(), runInShell: any(named: 'runInShell')),
+        () => process.run(
+          any(),
+          any(),
+          runInShell: any(named: 'runInShell'),
+          workingDirectory: any(named: 'workingDirectory'),
+        ),
       ).thenAnswer((_) async => processResult);
       when(() => processResult.exitCode).thenReturn(ExitCode.success.code);
     });
@@ -135,5 +140,45 @@ void main() {
         );
       });
     });
+
+    group('revParse', () {
+      const directory = './output';
+      const revision = 'revision';
+
+      test('executes correct command', () async {
+        const output = 'revision';
+        when(() => processResult.stdout).thenReturn(output);
+        await expectLater(
+          runWithOverrides(
+            () => git.revParse(directory: directory, revision: revision),
+          ),
+          completion(equals(output)),
+        );
+        verify(
+          () => process.run(
+            'git',
+            ['rev-parse', '--verify', revision],
+            workingDirectory: directory,
+          ),
+        ).called(1);
+      });
+
+      test('throws ProcessException if process exits with error', () async {
+        const error = 'oops';
+        when(() => processResult.exitCode).thenReturn(ExitCode.software.code);
+        when(() => processResult.stderr).thenReturn(error);
+        expect(
+          () => runWithOverrides(
+            () => git.revParse(
+              directory: directory,
+              revision: revision,
+            ),
+          ),
+          throwsA(
+            isA<ProcessException>().having((e) => e.message, 'message', error),
+          ),
+        );
+      });
+    });
   });
 }