Fix try-repo for staged untracked changes

pre_commit/commands/try_repo.py

@@ -32,9 +32,15 @@ def _repo_ref(tmpdir, repo, ref):
         shadow = os.path.join(tmpdir, 'shadow-repo')
         cmd_output('git', 'clone', repo, shadow)
         cmd_output('git', 'checkout', ref, '-b', '_pc_tmp', cwd=shadow)
+
         idx = git.git_path('index', repo=shadow)
         objs = git.git_path('objects', repo=shadow)
         env = dict(os.environ, GIT_INDEX_FILE=idx, GIT_OBJECT_DIRECTORY=objs)
+
+        staged_files = git.get_staged_files(cwd=repo)
+        if (len(staged_files) > 0):
+            cmd_output('git', 'add', *staged_files, cwd=repo, env=env)
+
         cmd_output('git', 'add', '-u', cwd=repo, env=env)
         git.commit(repo=shadow)
 

pre_commit/git.py

@@ -91,11 +91,12 @@ def get_conflicted_files():
     return set(merge_conflict_filenames) | set(merge_diff_filenames)
 
 
-def get_staged_files():
+def get_staged_files(cwd=None):
     return zsplit(cmd_output(
         'git', 'diff', '--staged', '--name-only', '--no-ext-diff', '-z',
         # Everything except for D
         '--diff-filter=ACMRTUXB',
+        cwd=cwd,
     )[1])
 
 

tests/commands/try_repo_test.py

@@ -123,3 +123,15 @@ def test_try_repo_uncommitted_changes(cap_out, tempdir_factory):
         config,
     )
     assert rest == 'modified name!...........................................................Passed\n'  # noqa: E501
+
+
+def test_try_repo_staged_changes(tempdir_factory):
+    repo = make_repo(tempdir_factory, 'modified_file_returns_zero_repo')
+
+    with cwd(repo):
+        open('staged-file', 'a').close()
+        open('second-staged-file', 'a').close()
+        cmd_output('git', 'add', '.')
+
+    with cwd(git_dir(tempdir_factory)):
+        assert not try_repo(try_repo_opts(repo, hook='bash_hook'))