int git_odb_open(git_odb **out, const char *objects_dir)
{
git_odb *db;
int error;
assert(out && objects_dir);
*out = NULL;
if ((error = git_odb_new(&db)) < 0)
return error;
if ((error = add_default_backends(db, objects_dir, 0)) < GIT_SUCCESS)
goto cleanup;
if ((error = load_alternates(db, objects_dir)) < GIT_SUCCESS)
goto cleanup;
*out = db;
return GIT_SUCCESS;
cleanup:
git_odb_close(db);
return error;
}
static int load_alternates(git_odb *odb, const char *objects_dir)
{
char alternates_path[GIT_PATH_MAX];
char alternate[GIT_PATH_MAX];
char *buffer;
gitfo_buf alternates_buf = GITFO_BUF_INIT;
int error;
git__joinpath(alternates_path, objects_dir, GIT_ALTERNATES_FILE);
if (gitfo_exists(alternates_path) < GIT_SUCCESS)
return GIT_SUCCESS;
if (gitfo_read_file(&alternates_buf, alternates_path) < GIT_SUCCESS)
return GIT_EOSERR;
buffer = (char *)alternates_buf.data;
error = GIT_SUCCESS;
/* add each alternate as a new backend; one alternate per line */
while ((error == GIT_SUCCESS) && (buffer = git__strtok(alternate, buffer, "\r\n")) != NULL)
error = add_default_backends(odb, alternate, 1);
gitfo_free_buf(&alternates_buf);
return error;
}
static int load_alternates(git_odb *odb, const char *objects_dir, int alternate_depth)
{
git_buf alternates_path = GIT_BUF_INIT;
git_buf alternates_buf = GIT_BUF_INIT;
char *buffer;
const char *alternate;
int result = 0;
/* Git reports an error, we just ignore anything deeper */
if (alternate_depth > GIT_ALTERNATES_MAX_DEPTH)
return 0;
if (git_buf_joinpath(&alternates_path, objects_dir, GIT_ALTERNATES_FILE) < 0)
return -1;
if (git_path_exists(alternates_path.ptr) == false) {
git_buf_free(&alternates_path);
return 0;
}
if (git_futils_readbuffer(&alternates_buf, alternates_path.ptr) < 0) {
git_buf_free(&alternates_path);
return -1;
}
buffer = (char *)alternates_buf.ptr;
/* add each alternate as a new backend; one alternate per line */
while ((alternate = git__strtok(&buffer, "\r\n")) != NULL) {
if (*alternate == '\0' || *alternate == '#')
continue;
/*
* Relative path: build based on the current `objects`
* folder. However, relative paths are only allowed in
* the current repository.
*/
if (*alternate == '.' && !alternate_depth) {
if ((result = git_buf_joinpath(&alternates_path, objects_dir, alternate)) < 0)
break;
alternate = git_buf_cstr(&alternates_path);
}
if ((result = add_default_backends(odb, alternate, true, alternate_depth + 1)) < 0)
break;
}
git_buf_free(&alternates_path);
git_buf_free(&alternates_buf);
return result;
}
int git_odb_open(git_odb **out, const char *objects_dir)
{
git_odb *db;
assert(out && objects_dir);
*out = NULL;
if (git_odb_new(&db) < 0)
return -1;
if (add_default_backends(db, objects_dir, 0, 0) < 0) {
git_odb_free(db);
return -1;
}
*out = db;
return 0;
}
int git_odb_add_disk_alternate(git_odb *odb, const char *path)
{
return add_default_backends(odb, path, true, 0);
}