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',
  41                 'nodeyumexclude', 'plcyumexclude',
  42                 'yumexclude', 'package', 'group', 'precious', 'junk', 'mirror', ]
  43
  44
  45 m_fcdistro_cutter = re.compile('([a-z]+)([0-9]+)')
  46 re_ident='[a-z]+'
  47
  48 class PkgsParser:
  49
  50     def __init__ (self,arch,fcdistro,pldistro,keyword,inputs,options):
  51         self.arch=arch
  52         self.fcdistro=fcdistro
  53         self.pldistro=pldistro
  54         self.keyword=keyword
  55         self.inputs=inputs
  56         # for verbose, new_line, and the like
  57         self.options=options
  58         ok=False
  59         for known in known_fcdistros:
  60             if fcdistro == known:
  61                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
  62                 ok=True
  63         if ok:
  64             self.distro=distro
  65             self.version=int(version)
  66         else:
  67             print >> stderr, 'unrecognized fcdistro', fcdistro
  68             sys.exit(1)
  69
  70     # qualifier is either '>=','<=', or '='
  71     def match (self, qualifier, version):
  72         if qualifier == '=':
  73             return self.version == version
  74         elif qualifier == '>=':
  75             return self.version >= version
  76         elif qualifier == '<=':
  77             return self.version <= version
  78         else:
  79             raise Exception, 'Internal error - unexpected qualifier %r' % qualifier
  80
  81     m_comment=re.compile('\A\s*#')
  82     m_blank=re.compile('\A\s*\Z')
  83
  84     m_ident=re.compile('\A'+re_ident+'\Z')
  85     re_qualified = '\s*'
  86     re_qualified += '(?P<plus_minus>[+-]?)'
  87     re_qualified += '\s*'
  88     re_qualified += '(?P<keyword>%s)'%re_ident
  89     re_qualified += '\s*'
  90     re_qualified += '(?P<qualifier>>=|<=|=)'
  91     re_qualified += '\s*'
  92     re_qualified += '(?P<fcdistro>%s[0-9]+)'%re_ident
  93     re_qualified += '\s*'
  94     m_qualified = re.compile('\A%s\Z'%re_qualified)
  95
  96     re_old = '[a-z]+[+-][a-z]+[0-9]+'
  97     m_old = re.compile ('\A%s\Z'%re_old)
  98
  99     # returns a tuple (included,excluded)
 100     def parse (self,filename):
 101         ok=True
 102         included=[]
 103         excluded=[]
 104         lineno=0
 105         try:
 106             for line in file(filename).readlines():
 107                 lineno += 1
 108                 line=line.strip()
 109                 if self.m_comment.match(line) or self.m_blank.match(line):
 110                     continue
 111                 try:
 112                     [lefts,rights] = line.split(':',1)
 113                     for left in lefts.split():
 114                         ########## single ident
 115                         if self.m_ident.match(left):
 116                             if left not in known_keywords:
 117                                 raise Exception,"Unknown keyword %r"%left
 118                             elif left == self.keyword:
 119                                 included += rights.split()
 120                         else:
 121                             m=self.m_qualified.match(left)
 122                             if m:
 123                                 (plus_minus,kw,qual,fcdistro) = m.groups()
 124                                 if kw not in known_keywords:
 125                                     raise Exception,"Unknown keyword in %r"%left
 126                                 if fcdistro not in known_fcdistros:
 127                                     raise Exception, 'Unknown fcdistro %r'%fcdistro
 128                                 # skip if another keyword
 129                                 if kw != self.keyword: continue
 130                                 # does this fcdistro match ?
 131                                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
 132                                 version = int (version)
 133                                 # skip if another distro family
 134                                 if distro != self.distro: continue
 135                                 # skip if the qualifier does not fit
 136                                 if not self.match (qual, version):
 137                                     if self.options.verbose: print >> stderr,'%s:%d:qualifer %s does not apply'%(filename,lineno,left)
 138                                     continue
 139                                 # we're in, let's add (default) or remove (if plus_minus is minus)
 140                                 if plus_minus == '-':
 141                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, excluding %r'%(filename,lineno,left,rights)
 142                                     excluded += rights.split()
 143                                 else:
 144                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, including %r'%(filename,lineno,left,rights)
 145                                     included += rights.split()
 146                             elif self.m_old.match(left):
 147                                 raise Exception,'Old-fashioned syntax not supported anymore %r'%left
 148                             else:
 149                                 raise Exception,'error in left expression %r'%left
 150
 151                 except Exception,e:
 152                     ok=False
 153                     print >> stderr, "%s:%d:syntax error: %r"%(filename,lineno,e)
 154         except Exception,e:
 155             ok=False
 156             print >> stderr, 'Could not parse file',filename,e
 157         return (ok,included,excluded)
 158
 159     def run (self):
 160         ok=True
 161         included=[]
 162         excluded=[]
 163         for input in self.inputs:
 164             (o,i,e) = self.parse (input)
 165             included += i
 166             excluded += e
 167             ok = ok and o
 168         # avoid set operations that would not preserve order
 169         results = [ x for x in included if x not in excluded ]
 170
 171         results = [ x.replace('@arch@',self.arch).\
 172                         replace('@fcdistro@',self.fcdistro).\
 173                         replace('@pldistro@',self.pldistro) for x in results]
 174         if self.options.sort_results:
 175             results.sort()
 176         # default is space-separated
 177         if not self.options.new_line:
 178             print " ".join(results)
 179         # but for tests results are printed each on a line
 180         else:
 181             for result in results : print result
 182         return ok
 183
 184 def main ():
 185     usage="Usage: %prog [options] keyword input[...]"
 186     parser=OptionParser (usage=usage)
 187     parser.add_option ('-a','--arch',dest='arch',action='store',default=default_arch,
 188                        help='target arch, e.g. i386 or x86_64, default=%s'%default_arch)
 189     parser.add_option ('-f','--fcdistro',dest='fcdistro',action='store', default=default_fcdistro,
 190                        help='fcdistro, e.g. f12 or centos5')
 191     parser.add_option ('-d','--pldistro',dest='pldistro',action='store', default=default_pldistro,
 192                        help='pldistro, e.g. onelab or planetlab')
 193     parser.add_option ('-v', '--verbose',dest='verbose',action='store_true',default=False,
 194                        help='verbose when using qualifiers')
 195     parser.add_option ('-n', '--new-line',dest='new_line',action='store_true',default=False,
 196                        help='print outputs separated with newlines rather than with a space')
 197     parser.add_option ('-u', '--no-sort',dest='sort_results',default=True,action='store_false',
 198                        help='keep results in the same order as in the inputs')
 199     (options,args) = parser.parse_args()
 200
 201     if len(args) <=1 :
 202         parser.print_help(file=stderr)
 203         sys.exit(1)
 204     keyword=args[0]
 205     inputs=args[1:]
 206     if not options.arch in known_arch:
 207         print >> stderr, 'Unsupported arch',options.arch
 208         parser.print_help(file=stderr)
 209         sys.exit(1)
 210     if not options.fcdistro in known_fcdistros:
 211         print >> stderr, 'Unsupported fcdistro',options.fcdistro
 212         parser.print_help(file=stderr)
 213         sys.exit(1)
 214
 215     pkgs = PkgsParser (options.arch,options.fcdistro,options.pldistro,keyword,inputs,options)
 216
 217     if pkgs.run():
 218         sys.exit(0)
 219     else:
 220         sys.exit(1)
 221
 222 if __name__ == '__main__':
 223     if main():
 224         sys.exit(0)
 225     else:
 226         sys.exit(1)