An Ansible module to merge files contained in a directory to a single file

merge_files.py

#!/usr/bin/python2

import filecmp
import json
import os
import shutil
import tempfile


def main():
    global module
    module = AnsibleModule(
        argument_spec = dict(
            header=dict(required=False),
            footer=dict(required=False),
            path=dict(required=True),
            dest=dict(required=True),

            owner=dict(required=False),
            group=dict(required=False),
            mode=dict(required=False),
        ),
        supports_check_mode=True
    )

    if not os.path.isdir(module.params["path"]):
        module.fail_json(msg="%s is not a path to an existing directory." % module.params["path"])
    if not os.path.isdir(os.path.dirname(module.params["dest"])):
        module.fail_json(msg="Destination directory (%s) doesn't exist, please create it first." % os.path.dirname(module.params["dest"]))

    # Open a temporary file for doing the merge
    fmerge = tempfile.NamedTemporaryFile()

    if "header" in module.params and module.params["header"]:
        fmerge.write(module.params["header"])

    # Open files contained in the directory, sorted by name
    files = os.listdir(module.params["path"])
    files.sort()
    for fname in files:
        fpath = os.path.join(module.params["path"], fname)
        if os.path.isfile(fpath):
            with open(fpath) as f:
                fmerge.write(f.read())

    if "footer" in module.params and module.params["footer"]:
        fmerge.write(module.params["footer"])

    fmerge.flush()

    # Check if the dest file is different
    if os.path.isfile(module.params["dest"]) and filecmp.cmp(fmerge.name, module.params["dest"]):
        module.exit_json(changed=False)

    # Do the swap
    if not module.check_mode:
        shutil.copyfile(fmerge.name, module.params["dest"])

        # Settings good rights on file
        if ("owner" in module.params and module.params["owner"]) or ("group" in module.params and module.params["group"]):
            os.chown(module.params["dest"],
                     module.params["owner"] if "owner" in module.params and module.params["owner"] else -1,
                     module.params["group"] if "group" in module.params and module.params["group"] else -1)

        if "mode" in module.params and module.params["mode"]:
            os.chmod(module.params["dest"], module.params["mode"])

    module.exit_json(changed=True)


from ansible.module_utils.basic import *
main()