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sparse-checkout: stop blocking empty workdirs

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Remove the error condition when updating the sparse-checkout leaves
an empty working directory.

This behavior was added in 9e1afb167 (sparse checkout: inhibit empty
worktree, 2009-08-20). The comment was added in a7bc906f2 (Add
explanation why we do not allow to sparse checkout to empty working
tree, 2011-09-22) in response to a "dubious" comment in 84563a624
(unpack-trees.c: cosmetic fix, 2010-12-22).

With the recent "cone mode" and "git sparse-checkout init [--cone]"
command, it is common to set a reasonable sparse-checkout pattern
set of

	/*
	!/*/

which matches only files at root. If the repository has no such files,
then their "git sparse-checkout init" command will fail.

Now that we expect this to be a common pattern, we should not have the
commands fail on an empty working directory. If it is a confusing
result, then the user can recover with "git sparse-checkout disable"
or "git sparse-checkout set". This is especially simple when using cone
mode.

Reported-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2020-05-04 18:27:43 +00:00 committed by Junio C Hamano
parent 5644ca28cd
commit ace224ac5f
3 changed files with 13 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
t/t1011-read-tree-sparse-checkout.sh
View File

@ -74,13 +74,19 @@ test_expect_success 'read-tree --no-sparse-checkout with empty .git/info/sparse-
test_expect_success 'read-tree with empty .git/info/sparse-checkout' '
git config core.sparsecheckout true &&
echo >.git/info/sparse-checkout &&
read_tree_u_must_fail -m -u HEAD &&
read_tree_u_must_succeed -m -u HEAD &&
git ls-files --stage >result &&
test_cmp expected result &&
git ls-files -t >result &&
cat >expected.swt <<-\EOF &&
S init.t
S sub/added
S sub/addedtoo
S subsub/added
EOF
test_cmp expected.swt result &&
test -f init.t &&
test -f sub/added
! test -f init.t &&
! test -f sub/added
'
test_expect_success 'match directories with trailing slash' '

8
t/t1091-sparse-checkout-builtin.sh
View File

@ -106,10 +106,8 @@ test_expect_success 'set enables config' '
cd empty-config &&
test_commit test file &&
test_path_is_missing .git/config.worktree &&
test_must_fail git sparse-checkout set nothing &&
git sparse-checkout set nothing &&
test_path_is_file .git/config.worktree &&
test_must_fail git config core.sparseCheckout &&
git sparse-checkout set "/*" &&
test_cmp_config true core.sparseCheckout
)
'
@ -302,8 +300,8 @@ test_expect_success 'revert to old sparse-checkout on empty update' '
echo >file &&
git add file &&
git commit -m "test" &&
test_must_fail git sparse-checkout set nothing 2>err &&
test_i18ngrep "Sparse checkout leaves no entry on working directory" err &&
git sparse-checkout set nothing 2>err &&
test_i18ngrep ! "Sparse checkout leaves no entry on working directory" err &&
test_i18ngrep ! ".git/index.lock" err &&
git sparse-checkout set file
)

34
unpack-trees.c
View File

@ -1677,8 +1677,6 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
}
if (!o->skip_sparse_checkout) {
int empty_worktree = 1;
/*
* Sparse checkout loop #2: set NEW_SKIP_WORKTREE on entries not in loop #1
* If they will have NEW_SKIP_WORKTREE, also set CE_SKIP_WORKTREE
@ -1706,19 +1704,6 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
if (apply_sparse_checkout(&o->result, ce, o))
ret = 1;
if (!ce_skip_worktree(ce))
empty_worktree = 0;
}
/*
* Sparse checkout is meant to narrow down checkout area
* but it does not make sense to narrow down to empty working
* tree. This is usually a mistake in sparse checkout rules.
* Do not allow users to do that.
*/
if (o->result.cache_nr && empty_worktree) {
ret = unpack_failed(o, "Sparse checkout leaves no entry on working directory");
goto done;
}
if (ret == 1) {
/*
@ -1779,7 +1764,7 @@ enum update_sparsity_result update_sparsity(struct unpack_trees_options *o)
{
enum update_sparsity_result ret = UPDATE_SPARSITY_SUCCESS;
struct pattern_list pl;
int i, empty_worktree;
int i;
unsigned old_show_all_errors;
int free_pattern_list = 0;
@ -1810,7 +1795,6 @@ enum update_sparsity_result update_sparsity(struct unpack_trees_options *o)
/* Then loop over entries and update/remove as needed */
ret = UPDATE_SPARSITY_SUCCESS;
empty_worktree = 1;
for (i = 0; i < o->src_index->cache_nr; i++) {
struct cache_entry *ce = o->src_index->cache[i];
@ -1824,28 +1808,12 @@ enum update_sparsity_result update_sparsity(struct unpack_trees_options *o)
if (apply_sparse_checkout(o->src_index, ce, o))
ret = UPDATE_SPARSITY_WARNINGS;
if (!ce_skip_worktree(ce))
empty_worktree = 0;
}
/*
* Sparse checkout is meant to narrow down checkout area
* but it does not make sense to narrow down to empty working
* tree. This is usually a mistake in sparse checkout rules.
* Do not allow users to do that.
*/
if (o->src_index->cache_nr && empty_worktree) {
unpack_failed(o, "Sparse checkout leaves no entry on working directory");
ret = UPDATE_SPARSITY_INDEX_UPDATE_FAILURES;
goto done;
}
skip_sparse_checkout:
if (check_updates(o, o->src_index))
ret = UPDATE_SPARSITY_WORKTREE_UPDATE_FAILURES;
done:
display_warning_msgs(o);
o->show_all_errors = old_show_all_errors;
if (free_pattern_list)