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authorJoshua Harlow <harlowja@yahoo-inc.com>2013-04-17 08:46:58 -0700
committerJoshua Harlow <harlowja@yahoo-inc.com>2013-04-17 08:46:58 -0700
commit87963dd237ff2080be62cc6a8afb4138471e4f20 (patch)
tree615d52483b48ec20d0b8eca7342e62b1602cfaaa /cloudinit/mergers/m_dict.py
parent7dac7bbd48bb56971c2fddfcf13d439d577740c1 (diff)
downloadvyos-cloud-init-87963dd237ff2080be62cc6a8afb4138471e4f20.tar.gz
vyos-cloud-init-87963dd237ff2080be62cc6a8afb4138471e4f20.zip
Handle namespacing issues.
Move from using the inbuilt type names as module names which is a bad thing to use it appears due to naming conflicts in the __init__ module and reduce the chances of these conflicts by enforcing a m_ prefix for merging modules.
Diffstat (limited to 'cloudinit/mergers/m_dict.py')
-rw-r--r--cloudinit/mergers/m_dict.py48
1 files changed, 48 insertions, 0 deletions
diff --git a/cloudinit/mergers/m_dict.py b/cloudinit/mergers/m_dict.py
new file mode 100644
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--- /dev/null
+++ b/cloudinit/mergers/m_dict.py
@@ -0,0 +1,48 @@
+# vi: ts=4 expandtab
+#
+# Copyright (C) 2012 Yahoo! Inc.
+#
+# Author: Joshua Harlow <harlowja@yahoo-inc.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 3, as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+class Merger(object):
+ def __init__(self, merger, opts):
+ self._merger = merger
+ self._overwrite = 'overwrite' in opts
+
+ # This merging algorithm will attempt to merge with
+ # another dictionary, on encountering any other type of object
+ # it will not merge with said object, but will instead return
+ # the original value
+ #
+ # On encountering a dictionary, it will create a new dictionary
+ # composed of the original and the one to merge with, if 'overwrite'
+ # is enabled then keys that exist in the original will be overwritten
+ # by keys in the one to merge with (and associated values). Otherwise
+ # if not in overwrite mode the 2 conflicting keys themselves will
+ # be merged.
+ def _on_dict(self, value, merge_with):
+ if not isinstance(merge_with, (dict)):
+ return value
+ merged = dict(value)
+ for (k, v) in merge_with.items():
+ if k in merged:
+ if not self._overwrite:
+ merged[k] = self._merger.merge(merged[k], v)
+ else:
+ merged[k] = v
+ else:
+ merged[k] = v
+ return merged