From: Victoria Dye <vdye@xxxxxxxxxx>
Remove `ensure_full_index` guard on `prime_cache_tree` and update
`prime_cache_tree_rec` to correctly reconstruct sparse directory entries in
the cache tree. While processing a tree's entries, `prime_cache_tree_rec`
must determine whether a directory entry is sparse or not by searching for
it in the index (*without* expanding the index). If a matching sparse
directory index entry is found, no subtrees are added to the cache tree
entry and the entry count is set to 1 (representing the sparse directory
itself). Otherwise, the tree is assumed to not be sparse and its subtrees
are recursively added to the cache tree.
Helped-by: Elijah Newren <newren@xxxxxxxxx>
Signed-off-by: Victoria Dye <vdye@xxxxxxxxxx>
---
cache-tree.c | 47 ++++++++++++++++++++++--
cache.h | 10 +++++
read-cache.c | 27 ++++++++++----
t/t1092-sparse-checkout-compatibility.sh | 15 +++++++-
4 files changed, 86 insertions(+), 13 deletions(-)
diff --git a/cache-tree.c b/cache-tree.c
index 9be19c85b66..2866101052c 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -740,15 +740,26 @@ out:
return ret;
}
+static void prime_cache_tree_sparse_dir(struct cache_tree *it,
+ struct tree *tree)
+{
+
+ oidcpy(&it->oid, &tree->object.oid);
+ it->entry_count = 1;
+}
+
static void prime_cache_tree_rec(struct repository *r,
struct cache_tree *it,
- struct tree *tree)
+ struct tree *tree,
+ struct strbuf *tree_path)
{
struct tree_desc desc;
struct name_entry entry;
int cnt;
+ int base_path_len = tree_path->len;
oidcpy(&it->oid, &tree->object.oid);
+
init_tree_desc(&desc, tree->buffer, tree->size);
cnt = 0;
while (tree_entry(&desc, &entry)) {
@@ -757,14 +768,40 @@ static void prime_cache_tree_rec(struct repository *r,
else {
struct cache_tree_sub *sub;
struct tree *subtree = lookup_tree(r, &entry.oid);
+
if (!subtree->object.parsed)
parse_tree(subtree);
sub = cache_tree_sub(it, entry.path);
sub->cache_tree = cache_tree();
- prime_cache_tree_rec(r, sub->cache_tree, subtree);
+
+ /*
+ * Recursively-constructed subtree path is only needed when working
+ * in a sparse index (where it's used to determine whether the
+ * subtree is a sparse directory in the index).
+ */
+ if (r->index->sparse_index) {
+ strbuf_setlen(tree_path, base_path_len);
+ strbuf_grow(tree_path, base_path_len + entry.pathlen + 1);
+ strbuf_add(tree_path, entry.path, entry.pathlen);
+ strbuf_addch(tree_path, '/');
+ }
+
+ /*
+ * If a sparse index is in use, the directory being processed may be
+ * sparse. To confirm that, we can check whether an entry with that
+ * exact name exists in the index. If it does, the created subtree
+ * should be sparse. Otherwise, cache tree expansion should continue
+ * as normal.
+ */
+ if (r->index->sparse_index &&
+ index_entry_exists(r->index, tree_path->buf, tree_path->len))
+ prime_cache_tree_sparse_dir(sub->cache_tree, subtree);
+ else
+ prime_cache_tree_rec(r, sub->cache_tree, subtree, tree_path);
cnt += sub->cache_tree->entry_count;
}
}
+
it->entry_count = cnt;
}
@@ -772,12 +809,14 @@ void prime_cache_tree(struct repository *r,
struct index_state *istate,
struct tree *tree)
{
+ struct strbuf tree_path = STRBUF_INIT;
+
trace2_region_enter("cache-tree", "prime_cache_tree", the_repository);
cache_tree_free(&istate->cache_tree);
istate->cache_tree = cache_tree();
- ensure_full_index(istate);
- prime_cache_tree_rec(r, istate->cache_tree, tree);
+ prime_cache_tree_rec(r, istate->cache_tree, tree, &tree_path);
+ strbuf_release(&tree_path);
istate->cache_changed |= CACHE_TREE_CHANGED;
trace2_region_leave("cache-tree", "prime_cache_tree", the_repository);
}
diff --git a/cache.h b/cache.h
index f6295f3b048..1d3e4665562 100644
--- a/cache.h
+++ b/cache.h
@@ -816,6 +816,16 @@ struct cache_entry *index_file_exists(struct index_state *istate, const char *na
*/
int index_name_pos(struct index_state *, const char *name, int namelen);
+/*
+ * Determines whether an entry with the given name exists within the
+ * given index. The return value is 1 if an exact match is found, otherwise
+ * it is 0. Note that, unlike index_name_pos, this function does not expand
+ * the index if it is sparse. If an item exists within the full index but it
+ * is contained within a sparse directory (and not in the sparse index), 0 is
+ * returned.
+ */
+int index_entry_exists(struct index_state *, const char *name, int namelen);
+
/*
* Some functions return the negative complement of an insert position when a
* precise match was not found but a position was found where the entry would
diff --git a/read-cache.c b/read-cache.c
index f5d4385c408..c079ece981a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -68,6 +68,11 @@
*/
#define CACHE_ENTRY_PATH_LENGTH 80
+enum index_search_mode {
+ NO_EXPAND_SPARSE = 0,
+ EXPAND_SPARSE = 1
+};
+
static inline struct cache_entry *mem_pool__ce_alloc(struct mem_pool *mem_pool, size_t len)
{
struct cache_entry *ce;
@@ -551,7 +556,10 @@ int cache_name_stage_compare(const char *name1, int len1, int stage1, const char
return 0;
}
-static int index_name_stage_pos(struct index_state *istate, const char *name, int namelen, int stage)
+static int index_name_stage_pos(struct index_state *istate,
+ const char *name, int namelen,
+ int stage,
+ enum index_search_mode search_mode)
{
int first, last;
@@ -570,7 +578,7 @@ static int index_name_stage_pos(struct index_state *istate, const char *name, in
first = next+1;
}
- if (istate->sparse_index &&
+ if (search_mode == EXPAND_SPARSE && istate->sparse_index &&
first > 0) {
/* Note: first <= istate->cache_nr */
struct cache_entry *ce = istate->cache[first - 1];
@@ -586,7 +594,7 @@ static int index_name_stage_pos(struct index_state *istate, const char *name, in
ce_namelen(ce) < namelen &&
!strncmp(name, ce->name, ce_namelen(ce))) {
ensure_full_index(istate);
- return index_name_stage_pos(istate, name, namelen, stage);
+ return index_name_stage_pos(istate, name, namelen, stage, search_mode);
}
}
@@ -595,7 +603,12 @@ static int index_name_stage_pos(struct index_state *istate, const char *name, in
int index_name_pos(struct index_state *istate, const char *name, int namelen)
{
- return index_name_stage_pos(istate, name, namelen, 0);
+ return index_name_stage_pos(istate, name, namelen, 0, EXPAND_SPARSE);
+}
+
+int index_entry_exists(struct index_state *istate, const char *name, int namelen)
+{
+ return index_name_stage_pos(istate, name, namelen, 0, NO_EXPAND_SPARSE) >= 0;
}
int remove_index_entry_at(struct index_state *istate, int pos)
@@ -1222,7 +1235,7 @@ static int has_dir_name(struct index_state *istate,
*/
}
- pos = index_name_stage_pos(istate, name, len, stage);
+ pos = index_name_stage_pos(istate, name, len, stage, EXPAND_SPARSE);
if (pos >= 0) {
/*
* Found one, but not so fast. This could
@@ -1322,7 +1335,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
strcmp(ce->name, istate->cache[istate->cache_nr - 1]->name) > 0)
pos = index_pos_to_insert_pos(istate->cache_nr);
else
- pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
+ pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce), EXPAND_SPARSE);
/* existing match? Just replace it. */
if (pos >= 0) {
@@ -1357,7 +1370,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e
if (!ok_to_replace)
return error(_("'%s' appears as both a file and as a directory"),
ce->name);
- pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce));
+ pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce), EXPAND_SPARSE);
pos = -pos-1;
}
return pos + 1;
diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index a8583030b38..5664ff8f039 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -763,9 +763,9 @@ test_expect_success 'sparse-index is not expanded' '
ensure_not_expanded checkout - &&
ensure_not_expanded switch rename-out-to-out &&
ensure_not_expanded switch - &&
- git -C sparse-index reset --hard &&
+ ensure_not_expanded reset --hard &&
ensure_not_expanded checkout rename-out-to-out -- deep/deeper1 &&
- git -C sparse-index reset --hard &&
+ ensure_not_expanded reset --hard &&
ensure_not_expanded restore -s rename-out-to-out -- deep/deeper1 &&
echo >>sparse-index/README.md &&
@@ -775,6 +775,17 @@ test_expect_success 'sparse-index is not expanded' '
echo >>sparse-index/untracked.txt &&
ensure_not_expanded add . &&
+ for ref in update-deep update-folder1 update-folder2 update-deep
+ do
+ echo >>sparse-index/README.md &&
+ ensure_not_expanded reset --hard $ref || return 1
+ done &&
+
+ ensure_not_expanded reset --hard update-deep &&
+ ensure_not_expanded reset --keep base &&
+ ensure_not_expanded reset --merge update-deep &&
+ ensure_not_expanded reset --hard &&
+
ensure_not_expanded checkout -f update-deep &&
test_config -C sparse-index pull.twohead ort &&
(
--
gitgitgadget
