From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
When we have sparse directory entries in the index, we want to compare
that directory against sparse-checkout patterns. Those pattern matching
algorithms are built expecting a file path, not a directory path. This
is especially important in the "cone mode" patterns which will match
files that exist within the "parent directories" as well as the
recursive directory matches.
If path_matches_pattern_list() is given a directory, we can add a fake
filename ("-") to the directory and get the same results as before,
assuming we are in cone mode. Since sparse index requires cone mode
patterns, this is an acceptable assumption.
Reviewed-by: Elijah Newren <newren@xxxxxxxxx>
Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
dir.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/dir.c b/dir.c
index ebe5ec046e0..0c5264b3b20 100644
--- a/dir.c
+++ b/dir.c
@@ -1376,7 +1376,7 @@ enum pattern_match_result path_matches_pattern_list(
struct path_pattern *pattern;
struct strbuf parent_pathname = STRBUF_INIT;
int result = NOT_MATCHED;
- const char *slash_pos;
+ size_t slash_pos;
if (!pl->use_cone_patterns) {
pattern = last_matching_pattern_from_list(pathname, pathlen, basename,
@@ -1397,21 +1397,35 @@ enum pattern_match_result path_matches_pattern_list(
strbuf_addch(&parent_pathname, '/');
strbuf_add(&parent_pathname, pathname, pathlen);
+ /*
+ * Directory entries are matched if and only if a file
+ * contained immediately within them is matched. For the
+ * case of a directory entry, modify the path to create
+ * a fake filename within this directory, allowing us to
+ * use the file-base matching logic in an equivalent way.
+ */
+ if (parent_pathname.len > 0 &&
+ parent_pathname.buf[parent_pathname.len - 1] == '/') {
+ slash_pos = parent_pathname.len - 1;
+ strbuf_add(&parent_pathname, "-", 1);
+ } else {
+ const char *slash_ptr = strrchr(parent_pathname.buf, '/');
+ slash_pos = slash_ptr ? slash_ptr - parent_pathname.buf : 0;
+ }
+
if (hashmap_contains_path(&pl->recursive_hashmap,
&parent_pathname)) {
result = MATCHED_RECURSIVE;
goto done;
}
- slash_pos = strrchr(parent_pathname.buf, '/');
-
- if (slash_pos == parent_pathname.buf) {
+ if (!slash_pos) {
/* include every file in root */
result = MATCHED;
goto done;
}
- strbuf_setlen(&parent_pathname, slash_pos - parent_pathname.buf);
+ strbuf_setlen(&parent_pathname, slash_pos);
if (hashmap_contains_path(&pl->parent_hashmap, &parent_pathname)) {
result = MATCHED;
--
gitgitgadget
