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='f14'
  37 known_fcdistros = [ 'centos5','centos6',
  38                     'f8', 'f10','f12', 'f14', 'f16', 'f17',
  39                     'sl6',
  40                     'lenny','squeeze','wheezy','jessie' ]
  41 default_pldistro='onelab'
  42
  43 known_keywords=['groupname', 'groupdesc',
  44                 'nodeyumexclude', 'plcyumexclude',
  45                 'yumexclude', 'package', 'group', 'precious', 'junk', 'mirror', ]
  46
  47
  48 m_fcdistro_cutter = re.compile('([a-z]+)([0-9]+)')
  49 re_ident='[a-z]+'
  50
  51 class PkgsParser:
  52
  53     def __init__ (self,arch,fcdistro,pldistro,keyword,inputs,options):
  54         self.arch=arch
  55         self.fcdistro=fcdistro
  56         self.pldistro=pldistro
  57         self.keyword=keyword
  58         self.inputs=inputs
  59         # for verbose, new_line, and the like
  60         self.options=options
  61         ok=False
  62         for known in known_fcdistros:
  63             if fcdistro == known:
  64                 try:
  65                     (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
  66                 # debian-like names can't use numbering
  67                 except:
  68                     distro=fcdistro
  69                     version=0
  70                 ok=True
  71         if ok:
  72             self.distro=distro
  73             self.version=int(version)
  74         else:
  75             print >> stderr, 'unrecognized fcdistro', fcdistro
  76             sys.exit(1)
  77
  78     # qualifier is either '>=','<=', or '='
  79     def match (self, qualifier, version):
  80         if qualifier == '=':
  81             return self.version == version
  82         elif qualifier == '>=':
  83             return self.version >= version
  84         elif qualifier == '<=':
  85             return self.version <= version
  86         else:
  87             raise Exception, 'Internal error - unexpected qualifier %r' % qualifier
  88
  89     m_comment=re.compile('\A\s*#')
  90     m_blank=re.compile('\A\s*\Z')
  91
  92     m_ident=re.compile('\A'+re_ident+'\Z')
  93     re_qualified = '\s*'
  94     re_qualified += '(?P<plus_minus>[+-]?)'
  95     re_qualified += '\s*'
  96     re_qualified += '(?P<keyword>%s)'%re_ident
  97     re_qualified += '\s*'
  98     re_qualified += '(?P<qualifier>>=|<=|=)'
  99     re_qualified += '\s*'
 100     re_qualified += '(?P<fcdistro>%s[0-9]+)'%re_ident
 101     re_qualified += '\s*'
 102     m_qualified = re.compile('\A%s\Z'%re_qualified)
 103
 104     re_old = '[a-z]+[+-][a-z]+[0-9]+'
 105     m_old = re.compile ('\A%s\Z'%re_old)
 106
 107     # returns a tuple (included,excluded)
 108     def parse (self,filename):
 109         ok=True
 110         included=[]
 111         excluded=[]
 112         lineno=0
 113         try:
 114             for line in file(filename).readlines():
 115                 lineno += 1
 116                 line=line.strip()
 117                 if self.m_comment.match(line) or self.m_blank.match(line):
 118                     continue
 119                 try:
 120                     [lefts,rights] = line.split(':',1)
 121                     for left in lefts.split():
 122                         ########## single ident
 123                         if self.m_ident.match(left):
 124                             if left not in known_keywords:
 125                                 raise Exception,"Unknown keyword %r"%left
 126                             elif left == self.keyword:
 127                                 included += rights.split()
 128                         else:
 129                             m=self.m_qualified.match(left)
 130                             if m:
 131                                 (plus_minus,kw,qual,fcdistro) = m.groups()
 132                                 if kw not in known_keywords:
 133                                     raise Exception,"Unknown keyword in %r"%left
 134                                 if fcdistro not in known_fcdistros:
 135                                     raise Exception, 'Unknown fcdistro %r'%fcdistro
 136                                 # skip if another keyword
 137                                 if kw != self.keyword: continue
 138                                 # does this fcdistro match ?
 139                                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
 140                                 version = int (version)
 141                                 # skip if another distro family
 142                                 if distro != self.distro: continue
 143                                 # skip if the qualifier does not fit
 144                                 if not self.match (qual, version):
 145                                     if self.options.verbose: print >> stderr,'%s:%d:qualifer %s does not apply'%(filename,lineno,left)
 146                                     continue
 147                                 # we're in, let's add (default) or remove (if plus_minus is minus)
 148                                 if plus_minus == '-':
 149                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, excluding %r'%(filename,lineno,left,rights)
 150                                     excluded += rights.split()
 151                                 else:
 152                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, including %r'%(filename,lineno,left,rights)
 153                                     included += rights.split()
 154                             elif self.m_old.match(left):
 155                                 raise Exception,'Old-fashioned syntax not supported anymore %r'%left
 156                             else:
 157                                 raise Exception,'error in left expression %r'%left
 158
 159                 except Exception,e:
 160                     ok=False
 161                     print >> stderr, "%s:%d:syntax error: %r"%(filename,lineno,e)
 162         except Exception,e:
 163             ok=False
 164             print >> stderr, 'Could not parse file',filename,e
 165         return (ok,included,excluded)
 166
 167     def run (self):
 168         ok=True
 169         included=[]
 170         excluded=[]
 171         for input in self.inputs:
 172             (o,i,e) = self.parse (input)
 173             included += i
 174             excluded += e
 175             ok = ok and o
 176         # avoid set operations that would not preserve order
 177         results = [ x for x in included if x not in excluded ]
 178
 179         results = [ x.replace('@arch@',self.arch).\
 180                         replace('@fcdistro@',self.fcdistro).\
 181                         replace('@pldistro@',self.pldistro) for x in results]
 182         if self.options.sort_results:
 183             results.sort()
 184         # default is space-separated
 185         if not self.options.new_line:
 186             print " ".join(results)
 187         # but for tests results are printed each on a line
 188         else:
 189             for result in results : print result
 190         return ok
 191
 192 def main ():
 193     usage="Usage: %prog [options] keyword input[...]"
 194     parser=OptionParser (usage=usage)
 195     parser.add_option ('-a','--arch',dest='arch',action='store',default=default_arch,
 196                        help='target arch, e.g. i386 or x86_64, default=%s'%default_arch)
 197     parser.add_option ('-f','--fcdistro',dest='fcdistro',action='store', default=default_fcdistro,
 198                        help='fcdistro, e.g. f12 or centos5')
 199     parser.add_option ('-d','--pldistro',dest='pldistro',action='store', default=default_pldistro,
 200                        help='pldistro, e.g. onelab or planetlab')
 201     parser.add_option ('-v', '--verbose',dest='verbose',action='store_true',default=False,
 202                        help='verbose when using qualifiers')
 203     parser.add_option ('-n', '--new-line',dest='new_line',action='store_true',default=False,
 204                        help='print outputs separated with newlines rather than with a space')
 205     parser.add_option ('-u', '--no-sort',dest='sort_results',default=True,action='store_false',
 206                        help='keep results in the same order as in the inputs')
 207     (options,args) = parser.parse_args()
 208
 209     if len(args) <=1 :
 210         parser.print_help(file=stderr)
 211         sys.exit(1)
 212     keyword=args[0]
 213     inputs=args[1:]
 214     if not options.arch in known_arch:
 215         print >> stderr, 'Unsupported arch',options.arch
 216         parser.print_help(file=stderr)
 217         sys.exit(1)
 218     if not options.fcdistro in known_fcdistros:
 219         print >> stderr, 'Unsupported fcdistro',options.fcdistro
 220         parser.print_help(file=stderr)
 221         sys.exit(1)
 222
 223     pkgs = PkgsParser (options.arch,options.fcdistro,options.pldistro,keyword,inputs,options)
 224
 225     if pkgs.run():
 226         sys.exit(0)
 227     else:
 228         sys.exit(1)
 229
 230 if __name__ == '__main__':
 231     if main():
 232         sys.exit(0)
 233     else:
 234         sys.exit(1)