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', 'i686', 'x86_64']
  36 default_fcdistro='f14'
  37 known_fcdistros = [ 'centos5','centos6',
  38                     'f8', 'f10','f12', 'f14', 'f16', 'f18','f20','f22',
  39                     'sl6',
  40                     # debians
  41                     'squeeze','wheezy','jessie',
  42                     # ubuntus
  43                     'oneiric', 'precise', 'quantal', 'raring', 'saucy' ]
  44 default_pldistro='onelab'
  45
  46 known_keywords=['groupname', 'groupdesc',
  47                 'nodeyumexclude', 'plcyumexclude',
  48                 'yumexclude', 'package', 'group', 'precious', 'junk', 'mirror', ]
  49
  50
  51 m_fcdistro_cutter = re.compile('([a-z]+)([0-9]+)')
  52 re_ident='[a-z]+'
  53
  54 class PkgsParser:
  55
  56     def __init__ (self,arch,fcdistro,pldistro,keyword,inputs,options):
  57         self.arch=arch
  58         self.fcdistro=fcdistro
  59         self.pldistro=pldistro
  60         self.keyword=keyword
  61         self.inputs=inputs
  62         # for verbose, new_line, and the like
  63         self.options=options
  64         ok=False
  65         for known in known_fcdistros:
  66             if fcdistro == known:
  67                 try:
  68                     (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
  69                 # debian-like names can't use numbering
  70                 except:
  71                     distro=fcdistro
  72                     version=0
  73                 ok=True
  74         if ok:
  75             self.distro=distro
  76             self.version=int(version)
  77         else:
  78             print >> stderr, 'unrecognized fcdistro', fcdistro
  79             sys.exit(1)
  80
  81     # qualifier is either '>=','<=', or '='
  82     def match (self, qualifier, version):
  83         if qualifier == '=':
  84             return self.version == version
  85         elif qualifier == '>=':
  86             return self.version >= version
  87         elif qualifier == '<=':
  88             return self.version <= version
  89         else:
  90             raise Exception, 'Internal error - unexpected qualifier %r' % qualifier
  91
  92     m_comment=re.compile('\A\s*#')
  93     m_blank=re.compile('\A\s*\Z')
  94
  95     m_ident=re.compile('\A'+re_ident+'\Z')
  96     re_qualified = '\s*'
  97     re_qualified += '(?P<plus_minus>[+-]?)'
  98     re_qualified += '\s*'
  99     re_qualified += '(?P<keyword>%s)'%re_ident
 100     re_qualified += '\s*'
 101     re_qualified += '(?P<qualifier>>=|<=|=)'
 102     re_qualified += '\s*'
 103     re_qualified += '(?P<fcdistro>%s[0-9]+)'%re_ident
 104     re_qualified += '\s*'
 105     m_qualified = re.compile('\A%s\Z'%re_qualified)
 106
 107     re_old = '[a-z]+[+-][a-z]+[0-9]+'
 108     m_old = re.compile ('\A%s\Z'%re_old)
 109
 110     # returns a tuple (included,excluded)
 111     def parse (self,filename):
 112         ok=True
 113         included=[]
 114         excluded=[]
 115         lineno=0
 116         try:
 117             for line in file(filename).readlines():
 118                 lineno += 1
 119                 line=line.strip()
 120                 if self.m_comment.match(line) or self.m_blank.match(line):
 121                     continue
 122                 try:
 123                     [lefts,rights] = line.split(':',1)
 124                     for left in lefts.split():
 125                         ########## single ident
 126                         if self.m_ident.match(left):
 127                             if left not in known_keywords:
 128                                 raise Exception,"Unknown keyword %r"%left
 129                             elif left == self.keyword:
 130                                 included += rights.split()
 131                         else:
 132                             m=self.m_qualified.match(left)
 133                             if m:
 134                                 (plus_minus,kw,qual,fcdistro) = m.groups()
 135                                 if kw not in known_keywords:
 136                                     raise Exception,"Unknown keyword in %r"%left
 137                                 if fcdistro not in known_fcdistros:
 138                                     raise Exception, 'Unknown fcdistro %r'%fcdistro
 139                                 # skip if another keyword
 140                                 if kw != self.keyword: continue
 141                                 # does this fcdistro match ?
 142                                 (distro,version)=m_fcdistro_cutter.match(fcdistro).groups()
 143                                 version = int (version)
 144                                 # skip if another distro family
 145                                 if distro != self.distro: continue
 146                                 # skip if the qualifier does not fit
 147                                 if not self.match (qual, version):
 148                                     if self.options.verbose: print >> stderr,'%s:%d:qualifer %s does not apply'%(filename,lineno,left)
 149                                     continue
 150                                 # we're in, let's add (default) or remove (if plus_minus is minus)
 151                                 if plus_minus == '-':
 152                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, excluding %r'%(filename,lineno,left,rights)
 153                                     excluded += rights.split()
 154                                 else:
 155                                     if self.options.verbose: print >> stderr,'%s:%d: from %s, including %r'%(filename,lineno,left,rights)
 156                                     included += rights.split()
 157                             elif self.m_old.match(left):
 158                                 raise Exception,'Old-fashioned syntax not supported anymore %r'%left
 159                             else:
 160                                 raise Exception,'error in left expression %r'%left
 161
 162                 except Exception,e:
 163                     ok=False
 164                     print >> stderr, "%s:%d:syntax error: %r"%(filename,lineno,e)
 165         except Exception,e:
 166             ok=False
 167             print >> stderr, 'Could not parse file',filename,e
 168         return (ok,included,excluded)
 169
 170     def run (self):
 171         ok=True
 172         included=[]
 173         excluded=[]
 174         for input in self.inputs:
 175             (o,i,e) = self.parse (input)
 176             included += i
 177             excluded += e
 178             ok = ok and o
 179         # avoid set operations that would not preserve order
 180         results = [ x for x in included if x not in excluded ]
 181
 182         results = [ x.replace('@arch@',self.arch).\
 183                         replace('@fcdistro@',self.fcdistro).\
 184                         replace('@pldistro@',self.pldistro) for x in results]
 185         if self.options.sort_results:
 186             results.sort()
 187         # default is space-separated
 188         if not self.options.new_line:
 189             print " ".join(results)
 190         # but for tests results are printed each on a line
 191         else:
 192             for result in results : print result
 193         return ok
 194
 195 def main ():
 196     usage="Usage: %prog [options] keyword input[...]"
 197     parser=OptionParser (usage=usage)
 198     parser.add_option ('-a','--arch',dest='arch',action='store',default=default_arch,
 199                        help='target arch, e.g. i386 or x86_64, default=%s'%default_arch)
 200     parser.add_option ('-f','--fcdistro',dest='fcdistro',action='store', default=default_fcdistro,
 201                        help='fcdistro, e.g. f12 or centos5')
 202     parser.add_option ('-d','--pldistro',dest='pldistro',action='store', default=default_pldistro,
 203                        help='pldistro, e.g. onelab or planetlab')
 204     parser.add_option ('-v', '--verbose',dest='verbose',action='store_true',default=False,
 205                        help='verbose when using qualifiers')
 206     parser.add_option ('-n', '--new-line',dest='new_line',action='store_true',default=False,
 207                        help='print outputs separated with newlines rather than with a space')
 208     parser.add_option ('-u', '--no-sort',dest='sort_results',default=True,action='store_false',
 209                        help='keep results in the same order as in the inputs')
 210     (options,args) = parser.parse_args()
 211
 212     if len(args) <=1 :
 213         parser.print_help(file=stderr)
 214         sys.exit(1)
 215     keyword=args[0]
 216     inputs=args[1:]
 217     if not options.arch in known_arch:
 218         print >> stderr, 'Unsupported arch',options.arch
 219         parser.print_help(file=stderr)
 220         sys.exit(1)
 221     if options.arch == 'i686': options.arch='i386'
 222     if not options.fcdistro in known_fcdistros:
 223         print >> stderr, 'Unsupported fcdistro',options.fcdistro
 224         parser.print_help(file=stderr)
 225         sys.exit(1)
 226
 227     pkgs = PkgsParser (options.arch,options.fcdistro,options.pldistro,keyword,inputs,options)
 228
 229     if pkgs.run():
 230         sys.exit(0)
 231     else:
 232         sys.exit(1)
 233
 234 if __name__ == '__main__':
 235     if main():
 236         sys.exit(0)
 237     else:
 238         sys.exit(1)