[PATCH 2/8] sparse-checkout: create leading directories

From: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>
Date: Jan 14, 2020, 19:25 UTC
Message-ID: <53a266f9aab5f4331c35b3ff15fb0628e2131c56.1579029963.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.513.git.1579029962.gitgitgadget@gmail.com>

From: Derrick Stolee <dstolee@microsoft.com>

The 'git init' command creates the ".git/info" directory and fills it with some default files. However, 'git worktree add' does not create the info directory for that worktree. This causes a problem when running "git sparse-checkout init" inside a worktree. While care was taken to allow the sparse-checkout config to be specific to a worktree, this initialization was untested.

Safely create the leading directories for the sparse-checkout file. This is the safest thing to do even without worktrees, as a user could delete their ".git/info" directory and expect Git to recover safely.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 builtin/sparse-checkout.c          |  4 ++++
 t/t1091-sparse-checkout-builtin.sh | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index b3bed891cb..3cee8ab46e 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -199,6 +199,10 @@ static int write_patterns_and_update(struct pattern_list *pl)
 	int result;
 
 	sparse_filename = get_sparse_checkout_filename();
+
+	if (safe_create_leading_directories(sparse_filename))
+		die(_("failed to create directory for sparse-checkout file"));
+
 	fd = hold_lock_file_for_update(&lk, sparse_filename,
 				      LOCK_DIE_ON_ERROR);
 
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index 20caefe155..37365dc668 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -295,4 +295,14 @@ test_expect_success 'interaction with submodules' '
 	check_files super/modules/child "a deep folder1 folder2"
 '
 
+test_expect_success 'different sparse-checkouts with worktrees' '
+	git -C repo worktree add --detach ../worktree &&
+	check_files worktree "a deep folder1 folder2" &&
+	git -C worktree sparse-checkout init --cone &&
+	git -C repo sparse-checkout set folder1 &&
+	git -C worktree sparse-checkout set deep/deeper1 &&
+	check_files repo "a folder1" &&
+	check_files worktree "a deep"
+'
+
 test_done

-- 
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