Function reftable_block_source_from_file

reftable/blocksource.c:132–174

};

int reftable_block_source_from_file(struct reftable_block_source *bs,
				    const char *name)
{
	struct file_block_source *p = NULL;
	struct stat st;
	int fd, err;

	fd = open(name, O_RDONLY);
	if (fd < 0) {
		if (errno == ENOENT)
			return REFTABLE_NOT_EXIST_ERROR;
		err = -1;
		goto out;
	}

	if (fstat(fd, &st) < 0) {
		err = REFTABLE_IO_ERROR;
		goto out;
	}

	REFTABLE_CALLOC_ARRAY(p, 1);
	if (!p) {
		err = REFTABLE_OUT_OF_MEMORY_ERROR;
		goto out;
	}

	err = reftable_mmap(&p->mmap, fd, st.st_size);
	if (err < 0)
		goto out;

	assert(!bs->ops);
	bs->ops = &file_vtable;
	bs->arg = p;

	err = 0;

out:
	if (fd >= 0)
		close(fd);
	if (err < 0)
		reftable_free(p);
	return err;
}