mirror of
https://github.com/thegeeklab/ansible-later.git
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100 lines
2.8 KiB
Python
100 lines
2.8 KiB
Python
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"""Module containing index utilities"""
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from functools import wraps
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import os
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import struct
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import tempfile
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from git.compat import is_win
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import os.path as osp
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__all__ = ('TemporaryFileSwap', 'post_clear_cache', 'default_index', 'git_working_dir')
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#{ Aliases
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pack = struct.pack
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unpack = struct.unpack
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#} END aliases
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class TemporaryFileSwap(object):
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"""Utility class moving a file to a temporary location within the same directory
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and moving it back on to where on object deletion."""
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__slots__ = ("file_path", "tmp_file_path")
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def __init__(self, file_path):
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self.file_path = file_path
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self.tmp_file_path = self.file_path + tempfile.mktemp('', '', '')
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# it may be that the source does not exist
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try:
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os.rename(self.file_path, self.tmp_file_path)
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except OSError:
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pass
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def __del__(self):
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if osp.isfile(self.tmp_file_path):
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if is_win and osp.exists(self.file_path):
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os.remove(self.file_path)
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os.rename(self.tmp_file_path, self.file_path)
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# END temp file exists
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#{ Decorators
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def post_clear_cache(func):
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"""Decorator for functions that alter the index using the git command. This would
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invalidate our possibly existing entries dictionary which is why it must be
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deleted to allow it to be lazily reread later.
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:note:
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This decorator will not be required once all functions are implemented
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natively which in fact is possible, but probably not feasible performance wise.
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"""
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@wraps(func)
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def post_clear_cache_if_not_raised(self, *args, **kwargs):
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rval = func(self, *args, **kwargs)
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self._delete_entries_cache()
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return rval
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# END wrapper method
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return post_clear_cache_if_not_raised
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def default_index(func):
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"""Decorator assuring the wrapped method may only run if we are the default
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repository index. This is as we rely on git commands that operate
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on that index only. """
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@wraps(func)
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def check_default_index(self, *args, **kwargs):
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if self._file_path != self._index_path():
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raise AssertionError(
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"Cannot call %r on indices that do not represent the default git index" % func.__name__)
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return func(self, *args, **kwargs)
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# END wrapper method
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return check_default_index
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def git_working_dir(func):
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"""Decorator which changes the current working dir to the one of the git
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repository in order to assure relative paths are handled correctly"""
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@wraps(func)
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def set_git_working_dir(self, *args, **kwargs):
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cur_wd = os.getcwd()
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os.chdir(self.repo.working_tree_dir)
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try:
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return func(self, *args, **kwargs)
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finally:
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os.chdir(cur_wd)
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# END handle working dir
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# END wrapper
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return set_git_working_dir
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#} END decorators
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