Merge pull request microsoft#417 from vdye/sparse-index/git-reset

Sparse index: `git reset`

t/t1092-sparse-checkout-compatibility.sh

@@ -630,6 +630,113 @@ test_expect_success 'reset with wildcard pathspec' '
 	test_all_match git ls-files -s -- folder1
 '
 
+# NEEDSWORK: with mixed reset, files with differences between HEAD and <commit>
+# will be added to the work tree even if outside the sparse checkout
+# definition, and even if the file is modified to a state of having no local
+# changes. The file is "re-ignored" if a hard reset is executed. We may want to
+# change this behavior in the future and enforce that files are not written
+# outside of the sparse checkout definition.
+test_expect_success 'checkout and mixed reset file tracking [sparse]' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset update-folder1 &&
+	test_all_match git reset update-deep &&
+
+	# At this point, there are no changes in the working tree. However,
+	# folder1/a now exists locally (even though it is outside of the sparse
+	# paths).
+	run_on_sparse test_path_exists folder1 &&
+
+	run_on_all rm folder1/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_sparse test_path_is_missing folder1 &&
+	test_path_exists full-checkout/folder1
+'
+
+test_expect_success 'checkout and reset (merge)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --merge deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --merge deepest
+'
+
+test_expect_success 'checkout and reset (keep)' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents a &&
+	test_all_match git reset --keep deepest &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset --hard update-deep &&
+	run_on_all ../edit-contents deep/a &&
+	test_all_match test_must_fail git reset --keep deepest
+'
+
+test_expect_success 'reset with pathspecs inside sparse definition' '
+	init_repos &&
+
+	write_script edit-contents <<-\EOF &&
+	echo text >>$1
+	EOF
+
+	test_all_match git checkout -b reset-test update-deep &&
+	run_on_all ../edit-contents deep/a &&
+
+	test_all_match git reset base -- deep/a &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset base -- nonexistent-file &&
+	test_all_match git status --porcelain=v2 &&
+
+	test_all_match git reset deepest -- deep &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with sparse directory pathspec outside definition' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- folder1 &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with file pathspec outside sparse definition' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- folder1/a &&
+	test_all_match git status --porcelain=v2
+'
+
+test_expect_success 'reset with wildcard pathspec' '
+	init_repos &&
+
+	test_all_match git checkout -b reset-test update-deep &&
+	test_all_match git reset --hard update-folder1 &&
+	test_all_match git reset base -- \*/a &&
+	test_all_match git status --porcelain=v2
+'
+
 test_expect_success 'merge, cherry-pick, and rebase' '
 	init_repos &&