def findfile (sfilename, dir):
    import shutil
    import fnmatch
    import os
    matches = []
    for root, dirnames, filenames in os.walk(dir):
        for filename in fnmatch.filter(filenames, sfilename):
            matches.append(os.path.join(root, filename))
            return matches

addtask do_signing after do_deploy

python do_signing() {
    matches = []
    signfiles = []
    deploydir = d.getVar('DEPLOY_DIR_IMAGE', True)
    signfiles = d.getVar('SRC_SIGNING', True)


    if not signfiles:
        return
    bb.warn ("do_signing ", deploydir)
    for item in d.getVar('SRC_SIGNING', True).split():
        matches = findfile(item,deploydir)
        if not matches:
            bb.warn ("file not found", item)
        elif len(matches) == 1:
            bb.warn ("item found ", item)
            """
            Add the line of code to sign the file
            """
        else:
            bb.warn ("more than one occurence found") }