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# Support for scanning init scripts for LSB info
import re, sys, os, cStringIO
try:
assert True
except:
True = 1
False = 0
class RFC822Parser(dict):
"A dictionary-like object."
__linere = re.compile(r'([^:]+):\s*(.*)$')
def __init__(self, fileob=None, strob=None, startcol=0, basedict=None):
if not fileob and not strob:
raise ValueError, 'need a file or string'
if not basedict:
basedict = {}
super(RFC822Parser, self).__init__(basedict)
if not fileob:
fileob = cStringIO.StringIO(strob)
key = None
for line in fileob:
if startcol:
line = line[startcol:]
if not line.strip():
continue
# Continuation line
if line[0].isspace():
if not key:
continue
self[key] += '\n' + line.strip()
continue
m = self.__linere.match(line)
if not m:
# Not a valid RFC822 header
continue
key, value = m.groups()
self[key] = value.strip()
# End of RFC882Parser
LSBLIB = '/var/lib/lsb'
FACILITIES = os.path.join(LSBLIB, 'facilities')
DEPENDS = os.path.join(LSBLIB, 'depends')
beginre = re.compile(re.escape('### BEGIN INIT INFO'))
endre = re.compile(re.escape('### END INIT INFO'))
#linere = re.compile(r'\#\s+([^:]+):\s*(.*)')
def scan_initfile(initfile):
headerlines = ''
scanning = False
for line in file(initfile):
line = line.rstrip()
if beginre.match(line):
scanning = True
continue
elif scanning and endre.match(line):
scanning = False
continue
elif not scanning:
continue
if line.startswith('# '):
headerlines += line[2:] + '\n'
elif line.startswith('#\t'):
headerlines += line[1:] + '\n'
inheaders = RFC822Parser(strob=headerlines)
headers = {}
for header, body in inheaders.iteritems():
# Ignore empty headers
if not body.strip():
break
if header in ('Default-Start', 'Default-Stop'):
headers[header] = map(int, body.split())
elif header in ('Required-Start', 'Required-Stop', 'Provides',
'Should-Start', 'Should-Stop'):
headers[header] = body.split()
else:
headers[header] = body
return headers
def save_facilities(facilities):
if not facilities:
try:
os.unlink(FACILITIES)
except OSError:
pass
return
fh = file(FACILITIES, 'w')
for facility, entries in facilities.items():
# Ignore system facilities
if facility.startswith('$'): continue
for (scriptname, pri) in entries.items():
start, stop = pri
print >> fh, "%(scriptname)s %(facility)s %(start)d %(stop)d" % locals()
fh.close()
def load_facilities():
facilities = {}
if os.path.exists(FACILITIES):
for line in open(FACILITIES).xreadlines():
try:
scriptname, name, start, stop = line.strip().split()
facilities.setdefault(name, {})[scriptname] = (int(start),
int(stop))
except ValueError, x:
print >> sys.stderr, 'Invalid facility line', line
return facilities
def load_depends():
depends = {}
if os.path.exists(DEPENDS):
independs = RFC822Parser(fileob=file(DEPENDS))
for initfile, facilities in independs.iteritems():
depends[initfile] = facilities.split()
return depends
def save_depends(depends):
if not depends:
try:
os.unlink(DEPENDS)
except OSError:
pass
return
fh = file(DEPENDS, 'w')
for initfile, facilities in depends.iteritems():
print >> fh, '%s: %s' % (initfile, ' '.join(facilities))
fh.close()
if __name__ == '__main__':
print scan_initfile('init-fragment')
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