contrib/svn-fe/svnrdump_sim.py

   1 #!/usr/bin/python
   2 """
   3 Simulates svnrdump by replaying an existing dump from a file, taking care
   4 of the specified revision range.
   5 To simulate incremental imports the environment variable SVNRMAX can be set
   6 to the highest revision that should be available.
   7 """
   8 import sys, os
   9
  10 if sys.hexversion < 0x02040000:
  11         # The limiter is the ValueError() calls. This may be too conservative
  12         sys.stderr.write("svnrdump-sim.py: requires Python 2.4 or later.\n")
  13         sys.exit(1)
  14
  15 def getrevlimit():
  16         var = 'SVNRMAX'
  17         if var in os.environ:
  18                 return os.environ[var]
  19         return None
  20
  21 def writedump(url, lower, upper):
  22         if url.startswith('sim://'):
  23                 filename = url[6:]
  24                 if filename[-1] == '/': filename = filename[:-1] #remove terminating slash
  25         else:
  26                 raise ValueError('sim:// url required')
  27         f = open(filename, 'r');
  28         state = 'header'
  29         wroterev = False
  30         while(True):
  31                 l = f.readline()
  32                 if l == '': break
  33                 if state == 'header' and l.startswith('Revision-number: '):
  34                         state = 'prefix'
  35                 if state == 'prefix' and l == 'Revision-number: %s\n' % lower:
  36                         state = 'selection'
  37                 if not upper == 'HEAD' and state == 'selection' and l == 'Revision-number: %s\n' % upper:
  38                         break;
  39
  40                 if state == 'header' or state == 'selection':
  41                         if state == 'selection': wroterev = True
  42                         sys.stdout.write(l)
  43         return wroterev
  44
  45 if __name__ == "__main__":
  46         if not (len(sys.argv) in (3, 4, 5)):
  47                 print("usage: %s dump URL -rLOWER:UPPER")
  48                 sys.exit(1)
  49         if not sys.argv[1] == 'dump': raise NotImplementedError('only "dump" is suppported.')
  50         url = sys.argv[2]
  51         r = ('0', 'HEAD')
  52         if len(sys.argv) == 4 and sys.argv[3][0:2] == '-r':
  53                 r = sys.argv[3][2:].lstrip().split(':')
  54         if not getrevlimit() is None: r[1] = getrevlimit()
  55         if writedump(url, r[0], r[1]): ret = 0
  56         else: ret = 1
  57         sys.exit(ret)