Vendor-in Python daemon package

LICENSE

@@ -221,6 +221,7 @@ at licenses/LICENSE-[project].txt.
     (ALv2 License) jqclock v2.3.0 (https://github.com/JohnRDOrazio/jQuery-Clock-Plugin)
     (ALv2 License) bootstrap3-typeahead v4.0.2 (https://github.com/bassjobsen/Bootstrap-3-Typeahead)
     (ALv2 License) connexion v2.7.0 (https://github.com/zalando/connexion)
+    (ALv2 License) python-daemon v2.3.2(https://pagure.io/python-daemon/)
 
 ========================================================================
 MIT licenses

airflow/_vendor/README.md

@@ -10,7 +10,7 @@ the `_vendor` package.
 All Vendored libraries must follow these rules:
 
 1. Vendored libraries must be pure Python--no compiling (so that we do not have to release multi-platform airflow packages on PyPI).
-2. Source code for the libary is included in this directory.
+2. Source code for the library is included in this directory.
 3. License must be included in this repo and in the [LICENSE](../../LICENSE) file and in the
    [licenses](../../licenses) folder.
 4. Requirements of the library become requirements of airflow core.

airflow/_vendor/daemon/__init__.py

@@ -0,0 +1,52 @@
+# daemon/__init__.py
+# Part of ‘python-daemon’, an implementation of PEP 3143.
+#
+# This is free software, and you are welcome to redistribute it under
+# certain conditions; see the end of this file for copyright
+# information, grant of license, and disclaimer of warranty.
+
+""" Library to implement a well-behaved Unix daemon process.
+
+    This library implements the well-behaved daemon specification of
+    :pep:`3143`, “Standard daemon process library”.
+
+    A well-behaved Unix daemon process is tricky to get right, but the
+    required steps are much the same for every daemon program. A
+    `DaemonContext` instance holds the behaviour and configured
+    process environment for the program; use the instance as a context
+    manager to enter a daemon state.
+
+    Simple example of usage::
+
+        import daemon
+
+        from spam import do_main_program
+
+        with daemon.DaemonContext():
+            do_main_program()
+
+    Customisation of the steps to become a daemon is available by
+    setting options on the `DaemonContext` instance; see the
+    documentation for that class for each option.
+    """
+
+from .daemon import DaemonContext
+
+
+__all__ = ['DaemonContext']
+
+
+# Copyright © 2009–2022 Ben Finney <ben+python@benfinney.id.au>
+# Copyright © 2006 Robert Niederreiter
+#
+# This is free software: you may copy, modify, and/or distribute this work
+# under the terms of the Apache License, version 2.0 as published by the
+# Apache Software Foundation.
+# No warranty expressed or implied. See the file ‘LICENSE.ASF-2’ for details.
+
+
+# Local variables:
+# coding: utf-8
+# mode: python
+# End:
+# vim: fileencoding=utf-8 filetype=python :

airflow/_vendor/daemon/_metadata.py

@@ -0,0 +1,141 @@
+# daemon/_metadata.py
+# Part of ‘python-daemon’, an implementation of PEP 3143.
+#
+# This is free software, and you are welcome to redistribute it under
+# certain conditions; see the end of this file for copyright
+# information, grant of license, and disclaimer of warranty.
+
+""" Package metadata for the ‘python-daemon’ distribution. """
+
+import datetime
+import json
+
+import pkg_resources
+
+
+distribution_name = "python-daemon"
+version_info_filename = "version_info.json"
+
+
+def get_distribution(name):
+    """ Get the `Distribution` instance for distribution `name`.
+
+        :param name: The distribution name for the query.
+        :return: The `pkg_resources.Distribution` instance, or
+            ``None`` if the distribution instance is not found.
+        """
+    distribution = None
+    try:
+        distribution = pkg_resources.get_distribution(name)
+    except pkg_resources.DistributionNotFound:
+        pass
+
+    return distribution
+
+
+def get_distribution_version_info(
+        distribution, filename=version_info_filename):
+    """ Get the version info from the installed distribution.
+
+        :param distribution: The `pkg_resources.Distribution` instance
+            representing the Python package to interrogate.
+        :param filename: Base filename of the version info resource.
+        :return: The version info as a mapping of fields.
+
+        The version info is stored as a metadata file in the
+        `distribution`.
+
+        If the `distribution` is ``None``, or the version info
+        metadata file is not found, the return value mapping fields
+        have placeholder values.
+        """
+    version_info = {
+            'release_date': "UNKNOWN",
+            'version': "UNKNOWN",
+            'maintainer': "UNKNOWN",
+            }
+
+    if distribution is not None:
+        if distribution.has_metadata(filename):
+            content = distribution.get_metadata(filename)
+            version_info = json.loads(content)
+
+    return version_info
+
+
+distribution = get_distribution(distribution_name)
+version_info = get_distribution_version_info(distribution)
+
+version_installed = version_info['version']
+
+
+author_name = "Ben Finney"
+author_email = "ben+python@benfinney.id.au"
+author = "{name} <{email}>".format(name=author_name, email=author_email)
+
+
+class YearRange:
+    """ A range of years spanning a period. """
+
+    def __init__(self, begin, end=None):
+        self.begin = begin
+        self.end = end
+
+    def __str__(self):
+        text = "{range.begin:04d}".format(range=self)
+        if self.end is not None:
+            if self.end > self.begin:
+                text = "{range.begin:04d}–{range.end:04d}".format(range=self)
+        return text
+
+
+def make_year_range(begin_year, end_date=None):
+    """ Construct the year range given a start and possible end date.
+
+        :param begin_year: The beginning year (text, 4 digits) for the
+            range.
+        :param end_date: The end date (text, ISO-8601 format) for the
+            range, or a non-date token string.
+        :return: The range of years as a `YearRange` instance.
+
+        If the `end_date` is not a valid ISO-8601 date string, the
+        range has ``None`` for the end year.
+        """
+    begin_year = int(begin_year)
+
+    try:
+        end_date = datetime.datetime.strptime(end_date, "%Y-%m-%d")
+    except (TypeError, ValueError):
+        # Specified end_date value is not a valid date.
+        end_year = None
+    else:
+        end_year = end_date.year
+
+    year_range = YearRange(begin=begin_year, end=end_year)
+
+    return year_range
+
+
+copyright_year_begin = "2001"
+build_date = version_info['release_date']
+copyright_year_range = make_year_range(copyright_year_begin, build_date)
+
+copyright = "Copyright © {year_range} {author} and others".format(
+        year_range=copyright_year_range, author=author)
+license = "Apache-2"
+url = "https://pagure.io/python-daemon/"
+
+
+# Copyright © 2008–2022 Ben Finney <ben+python@benfinney.id.au>
+#
+# This is free software: you may copy, modify, and/or distribute this work
+# under the terms of the Apache License, version 2.0 as published by the
+# Apache Software Foundation.
+# No warranty expressed or implied. See the file ‘LICENSE.ASF-2’ for details.
+
+
+# Local variables:
+# coding: utf-8
+# mode: python
+# End:
+# vim: fileencoding=utf-8 filetype=python :