origin_id_for

function of dascore.utils.identity

source

origin_id_for(
    source: ‘ArraySource’ ,
    size_bytes: ‘int | None’ = None,
    mtime_ns: ‘int | None’ = None,
    ordinal: ‘object’ = None,
)-> ‘str’

Return the origin id of a stored patch without touching the filesystem.

Parameters

Parameter	Description
source	The format, version, canonical path, and native logical patch key.
size_bytes	The size of the source, when available.
mtime_ns	The source’s modification time, when available.
ordinal	The fallback for a source without a native key.

Note

An id stored in the file remains authoritative. A derived id is only as good as its fields: changing the path, size, or modification time changes it, and a rewrite which keeps all three does not.