273 lines
10 KiB
Python
273 lines
10 KiB
Python
# Copyright 2017 IBM
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# Implementation of ini add / remove for devstack. We don't use the
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# python ConfigFile parser because that ends up rewriting the entire
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# file and doesn't ensure comments remain.
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import os.path
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import re
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import shutil
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import tempfile
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class IniFile(object):
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"""Class for manipulating ini files in place."""
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def __init__(self, fname):
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self.fname = fname
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def has(self, section, name):
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"""Returns True if section has a key that is name"""
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current_section = ""
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if not os.path.exists(self.fname):
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return False
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with open(self.fname, "r+") as reader:
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for line in reader.readlines():
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m = re.match("\[([^\[\]]+)\]", line)
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if m:
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current_section = m.group(1)
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if current_section == section:
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if re.match("%s\s*\=" % name, line):
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return True
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return False
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def add(self, section, name, value):
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"""add a key / value to an ini file in a section.
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The new key value will be added at the beginning of the
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section, if no section is found a new section and key value
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will be added to the end of the file.
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"""
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temp = tempfile.NamedTemporaryFile(mode='r')
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if os.path.exists(self.fname):
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shutil.copyfile(self.fname, temp.name)
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else:
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with open(temp.name, "w+"):
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pass
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found = False
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with open(self.fname, "w+") as writer:
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with open(temp.name) as reader:
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for line in reader.readlines():
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writer.write(line)
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m = re.match("\[([^\[\]]+)\]", line)
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if m and m.group(1) == section:
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found = True
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writer.write("%s = %s\n" % (name, value))
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if not found:
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writer.write("[%s]\n" % section)
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writer.write("%s = %s\n" % (name, value))
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def _at_existing_key(self, section, name, func, match="%s\s*\="):
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"""Run a function at a found key.
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NOTE(sdague): if the file isn't found, we end up
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exploding. This seems like the right behavior in nearly all
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circumstances.
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"""
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temp = tempfile.NamedTemporaryFile(mode='r')
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shutil.copyfile(self.fname, temp.name)
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current_section = ""
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with open(temp.name) as reader:
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with open(self.fname, "w+") as writer:
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for line in reader.readlines():
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m = re.match("\[([^\[\]]+)\]", line)
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if m:
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current_section = m.group(1)
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if current_section == section:
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if re.match(match % name, line):
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# run function with writer and found line
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func(writer, line)
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else:
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writer.write(line)
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else:
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writer.write(line)
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def remove(self, section, name):
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"""remove a key / value from an ini file in a section."""
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def _do_remove(writer, line):
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pass
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self._at_existing_key(section, name, _do_remove)
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def comment(self, section, name):
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def _do_comment(writer, line):
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writer.write("# %s" % line)
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self._at_existing_key(section, name, _do_comment)
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def uncomment(self, section, name):
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def _do_uncomment(writer, line):
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writer.write(re.sub("^#\s*", "", line))
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self._at_existing_key(section, name, _do_uncomment,
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match="#\s*%s\s*\=")
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def set(self, section, name, value):
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def _do_set(writer, line):
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writer.write("%s = %s\n" % (name, value))
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if self.has(section, name):
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self._at_existing_key(section, name, _do_set)
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else:
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self.add(section, name, value)
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class LocalConf(object):
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"""Class for manipulating local.conf files in place."""
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def __init__(self, fname):
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self.fname = fname
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def _conf(self, group, conf):
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current_section = ""
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for line in self._section(group, conf):
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m = re.match("\[([^\[\]]+)\]", line)
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if m:
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current_section = m.group(1)
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continue
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else:
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m2 = re.match(r"(\w+)\s*\=\s*(.+)", line)
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if m2:
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yield current_section, m2.group(1), m2.group(2)
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def _section(self, group, conf):
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"""Yield all the lines out of a meta section."""
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in_section = False
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with open(self.fname) as reader:
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for line in reader.readlines():
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if re.match(r"\[\[%s\|%s\]\]" % (
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re.escape(group),
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re.escape(conf)),
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line):
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in_section = True
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continue
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# any other meta section means we aren't in the
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# section we want to be.
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elif re.match("\[\[.*\|.*\]\]", line):
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in_section = False
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continue
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if in_section:
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yield line
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def extract(self, group, conf, target):
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ini_file = IniFile(target)
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for section, name, value in self._conf(group, conf):
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ini_file.set(section, name, value)
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def extract_localrc(self, target):
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with open(target, "a+") as f:
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for line in self._section("local", "localrc"):
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f.write(line)
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def _at_insert_point_local(self, name, func):
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temp = tempfile.NamedTemporaryFile(mode='r')
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shutil.copyfile(self.fname, temp.name)
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in_meta = False
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done = False
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with open(self.fname, "w+") as writer:
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with open(temp.name) as reader:
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for line in reader.readlines():
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if done:
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writer.write(line)
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continue
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if re.match(re.escape("[[local|localrc]]"), line):
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in_meta = True
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writer.write(line)
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elif re.match("\[\[.*\|.*\]\]", line):
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# if we're not done yet, we
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if in_meta:
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func(writer, None)
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writer.write(line)
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done = True
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in_meta = False
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continue
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elif re.match("\s*%s\s*\=" % re.escape(name), line):
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# we found our key, pass to the writer func
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func(writer, line)
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done = True
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else:
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# write out whatever we find
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writer.write(line)
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if not done:
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func(writer, None)
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def set_local(self, name, value):
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def _do_set(writer, line):
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writer.write("%s = %s\n" % (name, value))
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self._at_insert_point_local(name, _do_set)
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def _at_insert_point(self, group, conf, section, name, func):
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temp = tempfile.NamedTemporaryFile(mode='r')
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shutil.copyfile(self.fname, temp.name)
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in_meta = False
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in_section = False
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done = False
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with open(self.fname, "w+") as writer:
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with open(temp.name) as reader:
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for line in reader.readlines():
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if done:
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writer.write(line)
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continue
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if re.match(re.escape("[[%s|%s]]" % (group, conf)), line):
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in_meta = True
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writer.write(line)
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elif re.match("\[\[.*\|.*\]\]", line):
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# if we're not done yet, we
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if in_meta:
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if not in_section:
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# if we've not found the section yet,
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# write out section as well.
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writer.write("[%s]\n" % section)
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func(writer, None)
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done = True
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writer.write(line)
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in_meta = False
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in_section = False
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elif re.match(re.escape("[%s]" % section), line):
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# we found a relevant section
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writer.write(line)
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in_section = True
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elif re.match("\[[^\[\]]+\]", line):
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if in_meta and in_section:
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# We've ended our section, in our meta,
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# never found the key. Time to add it.
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func(writer, None)
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done = True
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in_section = False
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writer.write(line)
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elif (in_meta and in_section and
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re.match("\s*%s\s*\=" % re.escape(name), line)):
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# we found our match point
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func(writer, line)
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done = True
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else:
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# write out whatever we find
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writer.write(line)
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if not done:
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# we never found meta with a relevant section
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writer.write("[[%s|%s]]\n" % (group, conf))
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writer.write("[%s]\n" % (section))
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func(writer, None)
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def set(self, group, conf, section, name, value):
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def _do_set(writer, line):
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writer.write("%s = %s\n" % (name, value))
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self._at_insert_point(group, conf, section, name, _do_set)
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