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