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"""
Cobbler uses Cheetah templates for lots of stuff, but there's
some additional magic around that to deal with snippets/etc.
(And it's not spelled wrong!)
Copyright 2008, Red Hat, Inc
Michael DeHaan <mdehaan@redhat.com>
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
"""
import os
import os.path
import glob
from cexceptions import *
from template_api import Template
from utils import *
import utils
class Templar:
def __init__(self,config):
"""
Constructor
"""
self.config = config
self.api = config.api
self.settings = config.settings()
def render(self, data_input, search_table, out_path, subject=None):
"""
Render data_input back into a file.
data_input is either a string or a filename
search_table is a hash of metadata keys and values
out_path if not-none writes the results to a file
(though results are always returned)
subject is a profile or system object, if available (for snippet eval)
"""
if type(data_input) != str:
raw_data = data_input.read()
else:
raw_data = data_input
# backward support for Cobbler's legacy (and slightly more readable)
# template syntax.
raw_data = raw_data.replace("TEMPLATE::","$")
# HACK: the ksmeta field may contain nfs://server:/mount in which
# case this is likely WRONG for kickstart, which needs the NFS
# directive instead. Do this to make the templates work.
newdata = ""
if search_table.has_key("tree") and search_table["tree"].startswith("nfs://"):
for line in raw_data.split("\n"):
if line.find("--url") != -1 and line.find("url ") != -1:
rest = search_table["tree"][6:] # strip off "nfs://" part
try:
(server, dir) = rest.split(":",2)
except:
raise CX(_("Invalid syntax for NFS path given during import: %s" % search_table["tree"]))
line = "nfs --server %s --dir %s" % (server,dir)
# but put the URL part back in so koan can still see
# what the original value was
line = line + "\n" + "#url --url=%s" % search_table["tree"]
newdata = newdata + line + "\n"
raw_data = newdata
# tell Cheetah not to blow up if it can't find a symbol for something
raw_data = "#errorCatcher Echo\n" + raw_data
# now do full templating scan, where we will also templatify the snippet insertions
t = Template(source=raw_data, errorCatcher="Echo", searchList=[search_table])
try:
data_out = str(t)
except Exception, e:
return utils.cheetah_exc(e)
# now apply some magic post-filtering that is used by cobbler import and some
# other places, but doesn't use Cheetah. Forcing folks to double escape
# things would be very unwelcome.
for x in search_table:
if type(search_table[x]) == str:
data_out = data_out.replace("@@%s@@" % x, search_table[x])
# remove leading newlines which apparently breaks AutoYAST ?
if data_out.startswith("\n"):
data_out = data_out.strip()
if out_path is not None:
utils.mkdir(os.path.dirname(out_path))
fd = open(out_path, "w+")
fd.write(data_out)
fd.close()
return data_out
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