lsst.obs.base.gen3.repoConverter Namespace Reference

Classes
class	DataIdExtractor
class	RepoConverter

Functions
def	findMapperClass (root)

Function Documentation

findMapperClass()

def lsst.obs.base.gen3.repoConverter.findMapperClass

(

root

)

Find the mapper class associated with a Gen2 data repository root.

Parameters
----------
root : `str`
    Path to a Gen2 repository root directory.

Returns
-------
cls : `type`
    A subclass of `lsst.obs.base.CameraMapper`.

Raises
------
ValueError
    Raised if the directory does not appear to be the root of a
    Gen2 data repository.

Definition at line 40 of file repoConverter.py.

def findMapperClass(root):
    """Find the mapper class associated with a Gen2 data repository root.

    Parameters
    ----------
    root : `str`
        Path to a Gen2 repository root directory.

    Returns
    -------
    cls : `type`
        A subclass of `lsst.obs.base.CameraMapper`.

    Raises
    ------
    ValueError
        Raised if the directory does not appear to be the root of a
        Gen2 data repository.
    """
    cfgPath = os.path.join(root, "repositoryCfg.yaml")
    if os.path.exists(cfgPath):
        with open(cfgPath, "r") as f:
            repoCfg = yaml.load(f, Loader=yaml.UnsafeLoader)
            return repoCfg.mapper
    parentLinkPath = os.path.join(root, "_parent")
    if os.path.exists(parentLinkPath):
        return findMapperClass(os.readlink(parentLinkPath))
    mapperFilePath = os.path.join(root, "_mapper")
    if os.path.exists(mapperFilePath):
        with open(mapperFilePath, "r") as f:
            mapperClassPath = f.read().strip()
        return doImport(mapperClassPath)
    calibRegistryPath = os.path.join(root, "calibRegistry.sqlite3")
    if os.path.exists(calibRegistryPath):
        return findMapperClass(os.path.normpath(os.path.join(root, os.path.pardir)))
    raise ValueError(f"Could not determine (Gen2) mapper class for repo at '{root}'.")