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#
# ExtLinuxConf.py - Simple syslinux config parsing
#
# Copyright 2010 Citrix Systems Ltd.
#
# This software may be freely redistributed under the terms of the GNU
# general public license.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
import sys, re, os
import logging
import GrubConf
class ExtLinuxImage(object):
def __init__(self, lines, path):
self.reset(lines, path)
def __repr__(self):
return ("title: %s\n"
" root: %s\n"
" kernel: %s\n"
" args: %s\n"
" initrd: %s\n" %(self.title, self.root, self.kernel,
self.args, self.initrd))
def reset(self, lines, path):
self._initrd = self._kernel = self._readonly = None
self._args = ""
self.title = ""
self.lines = []
self.path = path
self.root = ""
map(self.set_from_line, lines)
def set_from_line(self, line, replace = None):
(com, arg) = GrubConf.grub_exact_split(line, 2)
com = com.lower()
# Special handling for mboot.c32
if com.lower() == "append" and self.kernel is not None:
(_,kernel) = self.kernel
if kernel.endswith("mboot.c32"):
kernel = None
args = None
initrd = None
modules = arg.split("---")
if len(modules) == 3: # Assume Xen + Kernel + Initrd
(_,kernel,initrd) = modules
elif len(modules) == 2: # Assume Kernel + Initrd
(kernel,initrd) = modules
if kernel:
setattr(self, "kernel", kernel.strip())
if initrd:
setattr(self, "initrd", initrd.strip())
# Bypass regular self.commands handling
com = None
elif arg.find("initrd="):
# find initrd image in append line
args = arg.strip().split(" ")
for a in args:
if a.lower().startswith("initrd="):
setattr(self, "initrd", a.replace("initrd=", ""))
arg = arg.replace(a, "")
if com is not None and self.commands.has_key(com):
if self.commands[com] is not None:
setattr(self, self.commands[com], re.sub('^"(.+)"$', r"\1", arg.strip()))
else:
logging.info("Ignored image directive %s" %(com,))
elif com is not None:
logging.warning("Unknown image directive %s" %(com,))
# now put the line in the list of lines
if replace is None:
self.lines.append(line)
else:
self.lines.pop(replace)
self.lines.insert(replace, line)
def set_kernel(self, val):
if val.find(" ") == -1:
self._kernel = (None,val)
self._args = None
return
(kernel, args) = val.split(None, 1)
self._kernel = (None,kernel)
self._args = args
def get_kernel(self):
return self._kernel
def set_args(self, val):
self._args = val
def get_args(self):
return self._args
kernel = property(get_kernel, set_kernel)
args = property(get_args, set_args)
def set_initrd(self, val):
self._initrd = (None,val)
def get_initrd(self):
return self._initrd
initrd = property(get_initrd, set_initrd)
def set_readonly(self, val):
self._readonly = 1
def get_readonly(self):
return self._readonly
readonly = property(get_readonly, set_readonly)
# set up command handlers
commands = {
"label": "title",
"kernel": "kernel",
"append": "args"}
class ExtLinuxConfigFile(object):
def __init__(self, fn = None):
self.filename = fn
self.images = []
self.timeout = -1
self._default = 0
if fn is not None:
self.parse()
def new_image(self, title, lines):
# ExtLinuxImage constructor doesn't have title but since path
# is being used by get_{kernel|initrd} functions we pass
# empty string rather than None (see lines above)
return ExtLinuxImage(lines, "")
def parse(self, buf = None):
if buf is None:
if self.filename is None:
raise ValueError, "No config file defined to parse!"
f = open(self.filename, 'r')
lines = f.readlines()
f.close()
else:
lines = buf.split("\n")
path = os.path.dirname(self.filename)
img = []
for l in lines:
l = l.strip()
# skip blank lines
if len(l) == 0:
continue
# skip comments
if l.startswith('#'):
continue
# new image
if l.lower().startswith("label"):
if len(img) > 0:
self.add_image(ExtLinuxImage(img, path))
img = [l]
continue
if len(img) > 0:
img.append(l)
continue
(com, arg) = GrubConf.grub_exact_split(l, 2)
com = com.lower()
if self.commands.has_key(com):
if self.commands[com] is not None:
setattr(self, self.commands[com], arg.strip())
else:
logging.info("Ignored directive %s" %(com,))
else:
logging.warning("Unknown directive %s" %(com,))
if len(img) > 0:
self.add_image(ExtLinuxImage(img, path))
def hasPassword(self):
return False
def hasPasswordAccess(self):
return True
def add_image(self, image):
self.images.append(image)
def _get_default(self):
for i in range(len(self.images)):
if self.images[i].title == self._default:
return i
return 0
def _set_default(self, val):
self._default = val
default = property(_get_default, _set_default)
commands = { "default": "default",
"timeout": "timeout",
"serial": None,
"prompt": None,
"display": None,
"f1": None,
"f2": None,
}
if __name__ == "__main__":
if sys.argv < 2:
raise RuntimeError, "Need a configuration file to read"
g = ExtLinuxConfigFile(sys.argv[1])
for i in g.images:
print i
print g.default
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