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sparse-checkout: create leading directories

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> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Derrick Stolee committed Jan 24, 2020 at 21:19 UTC 3c754067a1164ffafd965dcd44a9f004e6100e42
2 files changed +14
builtin/sparse-checkout.c
+4
@@ -199,6 +199,10 @@ static int write_patterns_and_update(struct pattern_list *pl)
199 int result;
200
201 sparse_filename = get_sparse_checkout_filename();
202 +
203 + if (safe_create_leading_directories(sparse_filename))
204 + die(_("failed to create directory for sparse-checkout file"));
205 +
206 fd = hold_lock_file_for_update(&lk, sparse_filename,
207 LOCK_DIE_ON_ERROR);
208
t/t1091-sparse-checkout-builtin.sh
+10
@@ -295,4 +295,14 @@ test_expect_success 'interaction with submodules' '
295 check_files super/modules/child a deep folder1 folder2
296 '
297
298 +test_expect_success 'different sparse-checkouts with worktrees' '
299 + git -C repo worktree add --detach ../worktree &&
300 + check_files worktree "a deep folder1 folder2" &&
301 + git -C worktree sparse-checkout init --cone &&
302 + git -C repo sparse-checkout set folder1 &&
303 + git -C worktree sparse-checkout set deep/deeper1 &&
304 + check_files repo a folder1 &&
305 + check_files worktree a deep
306 +'
307 +
308 test_done