Change in vdsm[master]: [WIP]configurators: move configurator functions into conf_utils

Yeela Kaplan has uploaded a new change for review.

Change subject: [WIP]configurators: move configurator functions into conf_utils
......................................................................

[WIP]configurators: move configurator functions into conf_utils

Change-Id: Id67a0f51adb2d543c0542a48c020d34a13d1f2ed
Signed-off-by: Yeela Kaplan 
---
M lib/vdsm/tool/Makefile.am
A lib/vdsm/tool/conf_utils.py
M vdsm.spec.in
3 files changed, 110 insertions(+), 1 deletion(-)

git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/86/44286/1

diff --git a/lib/vdsm/tool/Makefile.am b/lib/vdsm/tool/Makefile.am
index c8979ca..c3ed0cc 100644
--- a/lib/vdsm/tool/Makefile.am
+++ b/lib/vdsm/tool/Makefile.am
@@ -35,7 +35,8 @@
    dump_bonding_defaults.py \
    dump_volume_chains.py \
    nwfilter.py \
-	configfile.py \
+        conf_utils.py \
+        configfile.py \
    configurator.py \
    register.py \
    restore_nets.py \
diff --git a/lib/vdsm/tool/conf_utils.py b/lib/vdsm/tool/conf_utils.py
new file mode 100644
index 0000000..1308097
--- /dev/null
+++ b/lib/vdsm/tool/conf_utils.py
@@ -0,0 +1,107 @@
+# Copyright 2015 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+#
+# Refer to the README and COPYING files for full details of the license
+#
+import os
+
+from .. configfile import (
+    ConfigFile,
+)
+
+from ... import utils
+
+if utils.isOvirtNode():
+    from ovirt.node.utils.fs import Config as NodeCfg
+
+
+def get_file(fname, files):
+    return files[fname]['path']
+
+
+def remove_conf(files, version):
+    for cfile, content in files.items():
+        content['removeConf'](content['path'], version)
+
+
+def add_section(content, version, vdsmConfiguration={}):
+    """
+    Add a 'configuration section by vdsm' part to a config file.
+    This section contains only keys not originally defined
+    The section headers will include the current configuration version.
+    """
+    configuration = {}
+    for fragment in content['fragments']:
+        if vdsmConfiguration:
+            if is_applicable(fragment, vdsmConfiguration):
+                configuration.update(fragment['content'])
+        else:
+            configuration.update(fragment['content'])
+    if configuration:
+        with open_config(content['path'], version) as conff:
+            for key, val in configuration.items():
+                conff.addEntry(key, val)
+
+
+def remove_section(path, version):
+    """
+    remove entire 'configuration section by vdsm' section.
+    section is removed regardless of it's version.
+    """
+    if os.path.exists(path):
+        with open_config(path, version) as conff:
+            conff.removeConf()
+
+
+def remove_file(content, vdsmConfiguration):
+    """
+    delete a file if it exists.
+    """
+    if utils.isOvirtNode():
+        NodeCfg().delete(content['path'])
+    else:
+        try:
+            os.unlink(content['path'])
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                raise
+
+
+def get_persisted_files(files):
+    """
+    get files where vdsm is expected to add a section.
+    """
+    return [
+        cfile['path'] for cfile in files.values()
+        if cfile['persisted']
+    ]
+
+
+def open_config(path, conf_version):
+    return ConfigFile(path, conf_version)
+
+
+def is_applicable(fragment, vdsmConfiguration):
+    """
+    Return true if 'fragment' should be included for current
+    configuration. An applicable fragment is a fragment who's list
+    of conditions are met according to vdsmConfiguration.
+    """
+    applyFragment = True
+    for key, booleanValue in fragment['conditions'].items():
+        if vdsmConfiguration[key] != booleanValue:
+            applyFragment = False
+    return applyFragment
diff --git a/vdsm.spec.in b/vdsm.spec.in
index 5020d8b..21e1b50 100644
--- a/vdsm.spec.in
+++ b/vdsm.spec.in
@@ -1094,6 +1094,7 @@
 %{python_sitelib}/%{vdsm_name}/tool/dummybr.py*
 %{python_sitelib}/%{vdsm_name}/tool/dump_bonding_defaults.py*
 %{python_sitelib}/%{vdsm_name}/tool/nwfilter.py*
+%{python_sitelib}/%{vdsm_name}/tool/conf_utils.py*
 %{python_sitelib}/%{vdsm_name}/tool/configurator.py*
 %{python_sitelib}/%{vdsm_name}/tool/configurators/__init__*
 %{python_sitelib}/%{vdsm_name}/tool/configurators/certificates.py*