license-exists

def find_license_files(d):
    """
    Creates list of files used in LIC_FILES_CHKSUM and generic LICENSE files.
    """
    import shutil
    import oe.license
    from collections import defaultdict, OrderedDict

    # All the license files for the package
    lic_files = d.getVar('LIC_FILES_CHKSUM') or ""
    pn = d.getVar('PN')
    # The license files are located in S/LIC_FILE_CHECKSUM.
    srcdir = d.getVar('S')
    # Directory we store the generic licenses as set in the distro configuration
    generic_directory = d.getVar('COMMON_LICENSE_DIR')
    # List of basename, path tuples
    lic_files_paths = []
    # hash for keep track generic lics mappings
    non_generic_lics = {}
    # Entries from LIC_FILES_CHKSUM
    lic_chksums = {}
    license_source_dirs = []
    license_source_dirs.append(generic_directory)
    try:
        additional_lic_dirs = d.getVar('LICENSE_PATH').split()
        for lic_dir in additional_lic_dirs:
            license_source_dirs.append(lic_dir)
    except:
        pass

    class FindVisitor(oe.license.LicenseVisitor):
        def visit_Str(self, node):
            #
            # Until I figure out what to do with
            # the two modifiers I support (or greater = +
            # and "with exceptions" being *
            # we'll just strip out the modifier and put
            # the base license.
            find_license(node.s.replace("+", "").replace("*", ""))
            self.generic_visit(node)

        def visit_Constant(self, node):
            find_license(node.value.replace("+", "").replace("*", ""))
            self.generic_visit(node)

    def find_license(license_type):
        try:
            bb.utils.mkdirhier(gen_lic_dest)
        except:
            pass
        spdx_generic = None
        license_source = None
        # If the generic does not exist we need to check to see if there is an SPDX mapping to it,
        # unless NO_GENERIC_LICENSE is set.
        for lic_dir in license_source_dirs:
            if not os.path.isfile(os.path.join(lic_dir, license_type)):
                if d.getVarFlag('SPDXLICENSEMAP', license_type) != None:
                    # Great, there is an SPDXLICENSEMAP. We can copy!
                    bb.debug(1, "We need to use a SPDXLICENSEMAP for %s" % (license_type))
                    spdx_generic = d.getVarFlag('SPDXLICENSEMAP', license_type)
                    license_source = lic_dir
                    break
            elif os.path.isfile(os.path.join(lic_dir, license_type)):
                spdx_generic = license_type
                license_source = lic_dir
                break

        non_generic_lic = d.getVarFlag('NO_GENERIC_LICENSE', license_type)
        if spdx_generic and license_source:
            # we really should copy to generic_ + spdx_generic, however, that ends up messing the manifest
            # audit up. This should be fixed in emit_pkgdata (or, we actually got and fix all the recipes)

            lic_files_paths.append(("generic_" + license_type, os.path.join(license_source, spdx_generic),
                                    None, None))

            # The user may attempt to use NO_GENERIC_LICENSE for a generic license which doesn't make sense
            # and should not be allowed, warn the user in this case.
            elif os.path.isfile(os.path.join(lic_dir, license_type)):
                spdx_generic = license_type
                license_source = lic_dir
                break

        non_generic_lic = d.getVarFlag('NO_GENERIC_LICENSE', license_type)
        if spdx_generic and license_source:
            # we really should copy to generic_ + spdx_generic, however, that ends up messing the manifest
            # audit up. This should be fixed in emit_pkgdata (or, we actually got and fix all the recipes)

            lic_files_paths.append(("generic_" + license_type, os.path.join(license_source, spdx_generic),
                                    None, None))

            # The user may attempt to use NO_GENERIC_LICENSE for a generic license which doesn't make sense
            # and should not be allowed, warn the user in this case.
            if d.getVarFlag('NO_GENERIC_LICENSE', license_type):
                oe.qa.handle_error("license-no-generic",
                    "%s: %s is a generic license, please don't use NO_GENERIC_LICENSE for it." % (pn, license_type), d)

        elif non_generic_lic and non_generic_lic in lic_chksums:
            # if NO_GENERIC_LICENSE is set, we copy the license files from the fetched source
            # of the package rather than the license_source_dirs.
            lic_files_paths.append(("generic_" + license_type,
                                    os.path.join(srcdir, non_generic_lic), None, None))
            non_generic_lics[non_generic_lic] = license_type
        else:
            # Explicitly avoid the CLOSED license because this isn't generic
            if license_type != 'CLOSED':
                # And here is where we warn people that their licenses are lousy
                oe.qa.handle_error("license-exists",
                    "%s: No generic license file exists for: %s in any provider" % (pn, license_type), d)
            pass

   ...