pkgs.py

   1 #!/usr/bin/python
   2 #
   3 # This is a replacement for the formerly bash-written function pl_parsePkgs ()
   4 #
   5 # Usage: $0  [-a arch] default_arch keyword fcdistro pldistro pkgs-file[..s]
   6 # default_arch is $pl_DISTRO_ARCH, but can be overridden
   7 #
   8
   9 #################### original language was (in this example, keyword=package)
  10 ## to add to all distros
  11 # package: p1 p2
  12 ## to add in one distro
  13 # package+f12: p1 p2
  14 ## to remove in one distro
  15 # package-f10: p1 p2
  16 #################### replacement language
  17 ## add in distro f10
  18 # +package=f10: p1 p2
  19 # or simply
  20 # package=f10: p1 p2
  21 ## add in fedora distros starting with f10
  22 # +package>=f10: p1 p2
  23 # or simply
  24 # package>=f10: p1 p2
  25 ## ditto but remove instead
  26 # -package=centos5: p1 p2
  27 # -package<=centos5: p1 p2
  28
  29 import sys
  30 from sys import stderr
  31 from optparse import OptionParser
  32 import re
  33
  34 default_arch='x86_64'
  35 known_arch = ['i386','x86_64']
  36 default_fcdistro='f12'
  37 known_fcdistros = [ 'centos5','centos6','f8', 'f9','f10','f11','f12', 'f13', 'f14', 'f16', 'sl6']
  38 default_pldistro='onelab'
  39
  40 known_keywords=['groupname', 'groupdesc', 'kexclude', 'package', 'group', 'precious', 'junk', 'mirror', ]
  41
  42
  43 m_fcdistro_cutter = re.compile('([a-z]+)([0-9]+)')
  44 re_ident='[a-z]+'
  45
  46 class PkgsParser:
  47
  48     def __init__ (self,arch,fcdistro,pldistro,keyword,inputs,options):
  49         self.arch=arch
  50         self.fcdistro=fcdistro
  51         self.pldistro=pldistro
  52         self.keyword=keyword
  53         self.inputs=inputs
  54         # for verbose, new_line, and the like
  55         self.options=options
  56         ok=False
  57         for known in known_fcdistros:
  58             if fcdistro == known:
  59                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
  60                 ok=True
  61         if ok:
  62             self.distro=distro
  63             self.version=int(version)
  64         else:
  65             print >> stderr, 'unrecognized fcdistro', fcdistro
  66             sys.exit(1)
  67
  68     # qualifier is either '>=','<=', or '='
  69     def match (self, qualifier, version):
  70         if qualifier == '=':
  71             return self.version == version
  72         elif qualifier == '>=':
  73             return self.version >= version
  74         elif qualifier == '<=':
  75             return self.version <= version
  76         else:
  77             raise Exception, 'Internal error - unexpected qualifier %r' % qualifier
  78
  79     m_comment=re.compile('\A\s*#')
  80     m_blank=re.compile('\A\s*\Z')
  81
  82     m_ident=re.compile('\A'+re_ident+'\Z')
  83     re_qualified = '\s*'
  84     re_qualified += '(?P<plus_minus>[+-]?)'
  85     re_qualified += '\s*'
  86     re_qualified += '(?P<keyword>%s)'%re_ident
  87     re_qualified += '\s*'
  88     re_qualified += '(?P<qualifier>>=|<=|=)'
  89     re_qualified += '\s*'
  90     re_qualified += '(?P<fcdistro>%s[0-9]+)'%re_ident
  91     re_qualified += '\s*'
  92     m_qualified = re.compile('\A%s\Z'%re_qualified)
  93
  94     re_old = '[a-z]+[+-][a-z]+[0-9]+'
  95     m_old = re.compile ('\A%s\Z'%re_old)
  96
  97     # returns a tuple (included,excluded)
  98     def parse (self,filename):
  99         ok=True
 100         included=[]
 101         excluded=[]
 102         lineno=0
 103         try:
 104             for line in file(filename).readlines():
 105                 lineno += 1
 106                 line=line.strip()
 107                 if self.m_comment.match(line) or self.m_blank.match(line):
 108                     continue
 109                 try:
 110                     [lefts,rights] = line.split(':',1)
 111                     for left in lefts.split():
 112                         ########## single ident
 113                         if self.m_ident.match(left):
 114                             if left not in known_keywords:
 115                                 raise Exception,"Unknown keyword %r"%left
 116                             elif left == self.keyword:
 117                                 included += rights.split()
 118                         else:
 119                             m=self.m_qualified.match(left)
 120                             if m:
 121                                 (plus_minus,kw,qual,fcdistro) = m.groups()
 122                                 if kw not in known_keywords:
 123                                     raise Exception,"Unknown keyword in %r"%left
 124                                 if fcdistro not in known_fcdistros:
 125                                     raise Exception, 'Unknown fcdistro %r'%fcdistro
 126                                 # skip if another keyword
 127                                 if kw != self.keyword: continue
 128                                 # does this fcdistro match ?
 129                                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
 130                                 version = int (version)
 131                                 # skip if another distro family
 132                                 if distro != self.distro: continue
 133                                 # skip if the qualifier does not fit
 134                                 if not self.match (qual, version):
 135                                     if self.options.verbose: print >> stderr,'%s:%d:qualifer %s does not apply'%(filename,lineno,left)
 136                                     continue
 137                                 # we're in, let's add (default) or remove (if plus_minus is minus)
 138                                 if plus_minus == '-':
 139                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, excluding %r'%(filename,lineno,left,rights)
 140                                     excluded += rights.split()
 141                                 else:
 142                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, including %r'%(filename,lineno,left,rights)
 143                                     included += rights.split()
 144                             elif self.m_old.match(left):
 145                                 raise Exception,'Old-fashioned syntax not supported anymore %r'%left
 146                             else:
 147                                 raise Exception,'error in left expression %r'%left
 148
 149                 except Exception,e:
 150                     ok=False
 151                     print >> stderr, "%s:%d:syntax error: %r"%(filename,lineno,e)
 152         except Exception,e:
 153             ok=False
 154             print >> stderr, 'Could not parse file',filename,e
 155         return (ok,included,excluded)
 156
 157     def run (self):
 158         ok=True
 159         included=[]
 160         excluded=[]
 161         for input in self.inputs:
 162             (o,i,e) = self.parse (input)
 163             included += i
 164             excluded += e
 165             ok = ok and o
 166         results = list (set(included).difference(set(excluded)))
 167
 168         results = [ x.replace('@arch@',self.arch).\
 169                         replace('@fcdistro@',self.fcdistro).\
 170                         replace('@pldistro@',self.pldistro) for x in results]
 171         results.sort()
 172         # default is space-separated
 173         if not self.options.new_line:
 174             print " ".join(results)
 175         # but for tests results are printed each on a line
 176         else:
 177             for result in results : print result
 178         return ok
 179
 180 def main ():
 181     usage="Usage: %prog [options] keyword input[...]"
 182     parser=OptionParser (usage=usage)
 183     parser.add_option ('-a','--arch',dest='arch',action='store',default=default_arch,
 184                        help='target arch, e.g. i386 or x86_64')
 185     parser.add_option ('-f','--fcdistro',dest='fcdistro',action='store', default=default_fcdistro,
 186                        help='fcdistro, e.g. f12 or centos5')
 187     parser.add_option ('-d','--pldistro',dest='pldistro',action='store', default=default_pldistro,
 188                        help='pldistro, e.g. onelab or planetlab')
 189     parser.add_option ('-v', '--verbose',dest='verbose',action='store_true',default=False,
 190                        help='verbose when using qualifiers')
 191     parser.add_option ('-n', '--new-line',dest='new_line',action='store_true',default=False,
 192                        help='print outputs separated with newlines rather than with a space')
 193     (options,args) = parser.parse_args()
 194
 195     if len(args) <=1 :
 196         parser.print_help(file=stderr)
 197         sys.exit(1)
 198     keyword=args[0]
 199     inputs=args[1:]
 200     if not options.arch in known_arch:
 201         print >> stderr, 'Unsupported arch',options.arch
 202         parser.print_help(file=stderr)
 203         sys.exit(1)
 204     if not options.fcdistro in known_fcdistros:
 205         print >> stderr, 'Unsupported fcdistro',options.fcdistro
 206         parser.print_help(file=stderr)
 207         sys.exit(1)
 208
 209     pkgs = PkgsParser (options.arch,options.fcdistro,options.pldistro,keyword,inputs,options)
 210
 211     if pkgs.run():
 212         sys.exit(0)
 213     else:
 214         sys.exit(1)
 215
 216 if __name__ == '__main__':
 217     if main():
 218         sys.exit(0)
 219     else:
 220         sys.exit(1)