build.py 文件源码

def concat_job(job, options, file_ids):
    """
    Merge zero or more VG protobuf files into one by concatenation. Returns the
    merged file ID.

    """

    with job.fileStore.writeGlobalFileStream() as (cat_handle, cat_id):
        # Make one merged file

        for part_id in file_ids:
            # For each part file
            with job.fileStore.readGlobalFileStream(part_id) as part_handle:
                # Open it

                # And stream it to the combined file
                shutil.copyfileobj(part_handle, cat_handle)

    return cat_id