repository: Change ownership semantics

The ownership semantics have been changed all over the library to be
consistent. There are no more "borrowed" or duplicated references.

Main changes:

	- `git_repository_open2` and `3` have been dropped.

	- Added setters and getters to hotswap all the repository owned
	objects:

		`git_repository_index`
		`git_repository_set_index`
		`git_repository_odb`
		`git_repository_set_odb`
		`git_repository_config`
		`git_repository_set_config`
		`git_repository_workdir`
		`git_repository_set_workdir`

	Now working directories/index files/ODBs and so on can be
	hot-swapped after creating a repository and between operations.

	- All these objects now have proper ownership semantics with
	refcounting: they all require freeing after they are no longer
	needed (the repository always keeps its internal reference).

	- Repository open and initialization has been updated to keep in
	mind the configuration files. Bare repositories are now always
	detected, and a default config file is created on init.

	- All the tests affected by these changes have been dropped from the
	old test suite and ported to the new one.

1 files changed, 18 insertions, 5 deletions

diff --git a/src/blob.c b/src/blob.c
index f13a5be15..5fd0fd67e 100644
--- a/src/blob.c
+++ b/src/blob.c
@@ -41,9 +41,14 @@ int git_blob__parse(git_blob *blob, git_odb_object *odb_obj)
 int git_blob_create_frombuffer(git_oid *oid, git_repository *repo, const void *buffer, size_t len)
 {
 	int error;
+	git_odb *odb;
 	git_odb_stream *stream;
 
-	if ((error = git_odb_open_wstream(&stream, repo->db, len, GIT_OBJ_BLOB)) < GIT_SUCCESS)
+	error = git_repository_odb__weakptr(&odb, repo);
+	if (error < GIT_SUCCESS)
+		return error;
+
+	if ((error = git_odb_open_wstream(&stream, odb, len, GIT_OBJ_BLOB)) < GIT_SUCCESS)
 		return git__rethrow(error, "Failed to create blob");
 
 	if ((error = stream->write(stream, buffer, len)) < GIT_SUCCESS) {
@@ -69,11 +74,14 @@ int git_blob_create_fromfile(git_oid *oid, git_repository *repo, const char *pat
 	git_off_t size;
 	git_odb_stream *stream;
 	struct stat st;
+	const char *workdir;
+	git_odb *odb;
 
-	if (repo->path_workdir == NULL)
+	workdir = git_repository_workdir(repo);
+	if (workdir == NULL)
 		return git__throw(GIT_ENOTFOUND, "Failed to create blob. (No working directory found)");
 
-	git_path_join(full_path, repo->path_workdir, path);
+	git_path_join(full_path, workdir, path);
 
 	error = p_lstat(full_path, &st);
 	if (error < 0) {
@@ -83,11 +91,16 @@ int git_blob_create_fromfile(git_oid *oid, git_repository *repo, const char *pat
 	islnk = S_ISLNK(st.st_mode);
 	size = st.st_size;
 
-	if (!islnk)
+	error = git_repository_odb__weakptr(&odb, repo);
+	if (error < GIT_SUCCESS)
+		return error;
+
+	if (!islnk) {
 		if ((fd = p_open(full_path, O_RDONLY)) < 0)
 			return git__throw(GIT_ENOTFOUND, "Failed to create blob. Could not open '%s'", full_path);
+	}
 
-	if ((error = git_odb_open_wstream(&stream, repo->db, (size_t)size, GIT_OBJ_BLOB)) < GIT_SUCCESS) {
+	if ((error = git_odb_open_wstream(&stream, odb, (size_t)size, GIT_OBJ_BLOB)) < GIT_SUCCESS) {
 		if (!islnk)
 			p_close(fd);
 		return git__rethrow(error, "Failed to create blob");