Pop ignore only if whole relative path matches

When traversing the directory structure, the iterator pushes and
pops ignore files using a vector.  Some directories don't have
ignore files, so it uses a path comparison to decide when it is
right to actually pop the last ignore file.  This was only
comparing directory suffixes, though, so a subdirectory with the
same name as a parent could result in the parent's .gitignore
being popped off the list ignores too early.  This changes the
logic to compare the entire relative path of the ignore file.

3 files changed, 10 insertions, 6 deletions

diff --git a/src/ignore.c b/src/ignore.c
index deae204f8..b08ff2200 100644
--- a/src/ignore.c
+++ b/src/ignore.c
@@ -123,7 +123,7 @@ int git_ignore__for_path(
 	int error = 0;
 	const char *workdir = git_repository_workdir(repo);
 
-	assert(ignores);
+	assert(ignores && path);
 
 	memset(ignores, 0, sizeof(*ignores));
 	ignores->repo = repo;
@@ -140,10 +140,13 @@ int git_ignore__for_path(
 	if (workdir && git_path_root(path) < 0)
 		error = git_path_find_dir(&ignores->dir, path, workdir);
 	else
-		error = git_buf_sets(&ignores->dir, path);
+		error = git_buf_joinpath(&ignores->dir, path, "");
 	if (error < 0)
 		goto cleanup;
 
+	if (workdir && !git__prefixcmp(ignores->dir.ptr, workdir))
+		ignores->dir_root = strlen(workdir);
+
 	/* set up internals */
 	if ((error = get_internal_ignores(&ignores->ign_internal, repo)) < 0)
 		goto cleanup;
@@ -204,10 +207,10 @@ int git_ignore__pop_dir(git_ignores *ign)
 
 		if ((end = strrchr(start, '/')) != NULL) {
 			size_t dirlen = (end - start) + 1;
+			const char *relpath = ign->dir.ptr + ign->dir_root;
+			size_t pathlen = ign->dir.size - ign->dir_root;
 
-			if (ign->dir.size >= dirlen &&
-				!memcmp(ign->dir.ptr + ign->dir.size - dirlen, start, dirlen))
-			{
+			if (pathlen == dirlen && !memcmp(relpath, start, dirlen)) {
 				git_vector_pop(&ign->ign_path);
 				git_attr_file__free(file);
 			}
diff --git a/src/ignore.h b/src/ignore.h
index 46172c72f..ff9369000 100644
--- a/src/ignore.h
+++ b/src/ignore.h
@@ -28,6 +28,7 @@ typedef struct {
 	git_attr_file *ign_internal;
 	git_vector ign_path;
 	git_vector ign_global;
+	size_t dir_root; /* offset in dir to repo root */
 	int ignore_case;
 	int depth;
 } git_ignores;
diff --git a/src/path.c b/src/path.c
index 7cad28d45..a990b005f 100644
--- a/src/path.c
+++ b/src/path.c
@@ -624,7 +624,7 @@ int git_path_find_dir(git_buf *dir, const char *path, const char *base)
 
 	/* call dirname if this is not a directory */
 	if (!error) /* && git_path_isdir(dir->ptr) == false) */
-		error = git_path_dirname_r(dir, dir->ptr);
+		error = (git_path_dirname_r(dir, dir->ptr) < 0) ? -1 : 0;
 
 	if (!error)
 		error = git_path_to_dir(dir);