#!/usr/bin/env python
"""
Kernel configuration script
"""
import sys
import os
import re
INPUT = 'kernel.config'
OUTPUT = 'Makefile.config'
TMPOUTPUT = 'Makefile.config.tmp'
class DefaultDialog:
"Wrapper dialog that tries to return default values"
def __init__(self, dlg):
self.dlg = dlg
def set_title(self,text):
self.dlg.set_title(text)
def yesno(self, text, default=None):
if default is not None:
return default
return self.dlg.yesno(text, default)
def noyes(self, text, default=None):
if default is not None:
return default
return self.dlg.noyes(text, default)
def choice(self, text, choices, defopt=None):
if defopt is not None:
return choices[defopt][0]
return self.dlg.choice(text, choices, defopt)
class NoDialog:
def __init__(self):
self.printed = None
self.title = 'HelenOS Configuration'
def print_title(self):
if not self.printed:
sys.stdout.write("\n*** %s ***\n" % self.title)
self.printed = True
def set_title(self, text):
self.title = text
self.printed = False
def noyes(self, text, default=None):
if not default:
default = 'n'
return self.yesno(text, default)
def yesno(self, text, default=None):
self.print_title()
if default != 'n':
default = 'y'
while 1:
sys.stdout.write("%s (y/n)[%s]: " % (text,default))
inp = sys.stdin.readline()
if not inp:
raise EOFError
inp = inp.strip().lower()
if not inp:
return default
if inp == 'y':
return 'y'
elif inp == 'n':
return 'n'
def _print_choice(self, text, choices, defopt):
sys.stdout.write('%s:\n' % text)
for i,(text,descr) in enumerate(choices):
sys.stdout.write('\t%2d. %s\n' % (i, descr))
if defopt is not None:
sys.stdout.write('Enter choice number[%d]: ' % defopt)
else:
sys.stdout.write('Enter choice number: ')
def menu(self, text, choices, button, defopt=None):
menu = []
for key, descr in choices:
txt = key + (45-len(key))*' ' + ': ' + descr
menu.append((key, txt))
return self.choice(text, [button] + menu)
def choice(self, text, choices, defopt=None):
self.print_title()
while 1:
self._print_choice(text, choices, defopt)
inp = sys.stdin.readline()
if not inp:
raise EOFError
if not inp.strip():
if defopt is not None:
return choices[defopt][0]
continue
try:
number = int(inp.strip())
except ValueError:
continue
if number < 0 or number >= len(choices):
continue
return choices[number][0]
class Dialog(NoDialog):
def __init__(self):
NoDialog.__init__(self)
self.dlgcmd = os.environ.get('DIALOG','dialog')
self.title = ''
self.backtitle = 'HelenOS Kernel Configuration'
if os.system('%s --print-maxsize >/dev/null 2>&1' % self.dlgcmd) != 0:
raise NotImplementedError
def set_title(self,text):
self.title = text
def calldlg(self,*args,**kw):
"Wrapper for calling 'dialog' program"
indesc, outdesc = os.pipe()
pid = os.fork()
if not pid:
os.close(2)
os.dup(outdesc)
os.close(indesc)
dlgargs = [self.dlgcmd,'--title',self.title,
'--backtitle', self.backtitle]
for key,val in kw.items():
dlgargs.append('--'+key)
dlgargs.append(val)
dlgargs += args
os.execlp(self.dlgcmd,*dlgargs)
os.close(outdesc)
errout = os.fdopen(indesc,'r')
data = errout.read()
errout.close()
pid,status = os.wait()
if not os.WIFEXITED(status):
raise EOFError
status = os.WEXITSTATUS(status)
if status == 255:
raise EOFError
return status,data
def yesno(self, text, default=None):
text = text + ':'
width = '50'
height = '5'
if len(text) < 48:
text = ' '*int(((48-len(text))/2)) + text
else:
width = '0'
height = '0'
if default == 'n':
res,data = self.calldlg('--defaultno','--yesno',text,height,width)
else:
res,data = self.calldlg('--yesno',text,height,width)
if res == 0:
return 'y'
return 'n'
def menu(self, text, choices, button, defopt=None):
text = text + ':'
width = '70'
height = str(8 + len(choices))
args = []
for key,val in choices:
args.append(key)
args.append(val)
kw = {}
if defopt:
kw['default-item'] = choices[defopt][0]
res,data = self.calldlg('--cancel-label',button[1],
'--menu',text,height,width,
str(len(choices)),*args,**kw)
if res == 1:
return button[0]
elif res:
print data
raise EOFError
return data
def choice(self, text, choices, defopt=None):
text = text + ':'
width = '50'
height = str(8 + len(choices))
args = []
for key,val in choices:
args.append(key)
args.append(val)
kw = {}
if defopt:
kw['default-item'] = choices[defopt][0]
res,data = self.calldlg('--nocancel','--menu',text,height,width,
str(len(choices)),*args, **kw)
if res:
print data
raise EOFError
return data
def read_defaults(fname,defaults):
"Read saved values from last configuration run"
f = file(fname,'r')
for line in f:
res = re.match(r'^(?:#!# )?([^#]\w*)\s*=\s*(.*?)\s*$', line)
if res:
defaults[res.group(1)] = res.group(2)
f.close()
def check_condition(text, defaults):
result = True
conds = text.split('&')
for cond in conds:
if cond.startswith('(') and cond.endswith(')'):
cond = cond[1:-1]
if not check_dnf(cond, defaults):
return False
return True
def check_dnf(text, defaults):
"""
Check that the condition specified on input line is True
only CNF is supported
"""
conds = text.split('|')
for cond in conds:
res = re.match(r'^(.*?)(!?=)(.*)$', cond)
if not res:
raise RuntimeError("Invalid condition: %s" % cond)
condname = res.group(1)
oper = res.group(2)
condval = res.group(3)
if not defaults.has_key(condname):
raise RuntimeError("Condition var %s does not exist: %s" % \
(condname,text))
if oper=='=' and condval == defaults[condname]:
return True
if oper == '!=' and condval != defaults[condname]:
return True
return False
def parse_config(input, output, dlg, defaults={}, askonly=None):
"Parse configuration file and create Makefile.config on the fly"
def ask_the_question():
"Ask question based on the type of variables to ask"
# This is quite a hack, this thingy is written just to
# have access to local variables..
if vartype == 'y/n':
return dlg.yesno(comment, default)
elif vartype == 'n/y':
return dlg.noyes(comment, default)
elif vartype == 'choice':
defopt = None
if default is not None:
for i,(key,val) in enumerate(choices):
if key == default:
defopt = i
break
return dlg.choice(comment, choices, defopt)
else:
raise RuntimeError("Bad method: %s" % vartype)
f = file(input, 'r')
outf = file(output, 'w')
outf.write('#########################################\n')
outf.write('## AUTO-GENERATED FILE, DO NOT EDIT!!! ##\n')
outf.write('#########################################\n\n')
asked_names = []
comment = ''
default = None
choices = []
for line in f:
if line.startswith('%'):
res = re.match(r'^%\s*(?:\[(.*?)\])?\s*(.*)$', line)
if not res:
raise RuntimeError('Invalid command: %s' % line)
if res.group(1):
if not check_condition(res.group(1), defaults):
continue
args = res.group(2).strip().split(' ')
cmd = args[0].lower()
args = args[1:]
if cmd == 'saveas':
outf.write('%s = %s\n' % (args[1],defaults[args[0]]))
continue
if line.startswith('!'):
# Ask a question
res = re.search(r'!\s*(?:\[(.*?)\])?\s*([^\s]+)\s*\((.*)\)\s*$', line)
if not res:
raise RuntimeError("Weird line: %s" % line)
varname = res.group(2)
vartype = res.group(3)
default = defaults.get(varname,None)
if res.group(1):
if not check_condition(res.group(1), defaults):
if default is not None:
outf.write('#!# %s = %s\n' % (varname, default))
# Clear cumulated values
comment = ''
default = None
choices = []
continue
asked_names.append((varname,comment))
if default is None or not askonly or askonly == varname:
default = ask_the_question()
outf.write('%s = %s\n' % (varname, default))
# Remeber the selected value
defaults[varname] = default
# Clear cumulated values
comment = ''
default = None
choices = []
continue
if line.startswith('@'):
# Add new line into the 'choice array'
res = re.match(r'@\s*(?:\[(.*?)\])?\s*"(.*?)"\s*(.*)$', line)
if not res:
raise RuntimeError("Bad line: %s" % line)
if res.group(1):
if not check_condition(res.group(1),defaults):
continue
choices.append((res.group(2), res.group(3)))
continue
# All other things print to output file
outf.write(line)
if re.match(r'^#[^#]', line):
# Last comment before question will be displayed to the user
comment = line[1:].strip()
elif line.startswith('## '):
# Set title of the dialog window
dlg.set_title(line[2:].strip())
outf.close()
f.close()
return asked_names
def main():
defaults = {}
try:
dlg = Dialog()
except NotImplementedError:
dlg = NoDialog()
if len(sys.argv) == 2 and sys.argv[1]=='default':
defmode = True
else:
defmode = False
# Default run will update the configuration file
# with newest options
if os.path.exists(OUTPUT):
read_defaults(OUTPUT, defaults)
# Dry run only with defaults
varnames = parse_config(INPUT, TMPOUTPUT, DefaultDialog(dlg), defaults)
# If not in default mode, present selection of all possibilities
if not defmode:
defopt = 0
while 1:
# varnames contains variable names that were in the
# last question set
choices = [ (x[1],defaults[x[0]]) for x in varnames ]
res = dlg.menu('Configuration',choices,('save','Save'),defopt)
if res == 'save':
parse_config(INPUT, TMPOUTPUT, DefaultDialog(dlg), defaults)
break
# transfer description back to varname
for i,(vname,descr) in enumerate(varnames):
if res == descr:
defopt = i
break
# Ask the user a simple question, produce output
# as if the user answered all the other questions
# with default answer
varnames = parse_config(INPUT, TMPOUTPUT, dlg, defaults,
askonly=varnames[i][0])
if os.path.exists(OUTPUT):
os.unlink(OUTPUT)
os.rename(TMPOUTPUT, OUTPUT)
if __name__ == '__main__':
main()