Release 21.3: Improve ionice integration (support busybox)

Author: xolox

Diff for: CHANGELOG.rst

@@ -11,6 +11,22 @@ to `semantic versioning`_.
 .. _Keep a Changelog: http://keepachangelog.com/
 .. _semantic versioning: http://semver.org/
 
+`Release 21.3`_ (2018-11-17)
+----------------------------
+
+Merged pull request `#16`_ that changes the ``ionice`` integration to accept
+the strings '1', '2' and '3' in addition to 'idle', 'best-effort' and
+'realtime' because ``busybox`` doesn't support the verbose strings.
+
+It's still up to the caller to pick the right kind of value and I'm a bit
+conflicted about that because it's creating a leaky abstraction. I may at a
+later point decide to add automatic translation from the verbose labels to the
+numeric codes (which seem to be the lowest common denominator that's always
+supported) ...
+
+.. _Release 21.3: https://github.com/xolox/python-executor/compare/21.2...21.3
+.. _#16: https://github.com/xolox/python-executor/pull/16
+
 `Release 21.2`_ (2018-10-11)
 ----------------------------
 

Diff for: executor/__init__.py

@@ -3,7 +3,7 @@
 # Programmer friendly subprocess wrapper.
 #
 # Author: Peter Odding <peter@peterodding.com>
-# Last Change: October 30, 2018
+# Last Change: November 17, 2018
 # URL: https://executor.readthedocs.io
 
 """
@@ -68,7 +68,7 @@
 from executor.process import ControllableProcess
 
 # Semi-standard module versioning.
-__version__ = '21.2'
+__version__ = '21.3'
 
 # Initialize a logger.
 logger = logging.getLogger(__name__)
@@ -2116,6 +2116,13 @@ def validate_ionice_class(value):
               'best-effort', or 'realtime').
     :raises: :exc:`~exceptions.ValueError` when the given value isn't one of
              the strings mentioned above.
+
+    The strings 'idle', 'best-effort' and 'realtime' are preferred for
+    readability but not supported in minimalistic environments like busybox
+    which only support the values '1', '2' and '3' (refer to `#16`_). It's up
+    to the caller to choose the correct value, no translation is done.
+
+    .. _#16: https://github.com/xolox/python-executor/pull/16
     """
     expected = ('idle', 'best-effort', 'realtime', '1', '2', '3')
     if value not in expected: