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hghave: feature absence can be checked by prefixing with 'no-'
author Patrick Mezard <pmezard@gmail.com>
date Wed, 08 Aug 2007 23:07:39 +0200
parents ea7b982b6c08
children bf60e4bd6672
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2 """Test the running system for features availability. Exit with zero
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3 if all features are there, non-zero otherwise. If a feature name is
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4 prefixed with "no-", the absence of feature is tested.
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5 """
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6 import optparse
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7 import os
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8 import sys
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9 import tempfile
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10
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11 def has_symlink():
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12 return hasattr(os, "symlink")
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13
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14 def has_fifo():
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15 return hasattr(os, "mkfifo")
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16
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17 def has_executablebit():
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18 fd, path = tempfile.mkstemp()
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19 os.close(fd)
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20 try:
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21 s = os.lstat(path).st_mode
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22 os.chmod(path, s | 0100)
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23 return (os.lstat(path).st_mode & 0100 != 0)
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24 finally:
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25 os.remove(path)
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26
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27 def has_eol_in_paths():
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28 try:
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29 fd, path = tempfile.mkstemp(suffix='\n\r')
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30 os.close(fd)
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31 os.remove(path)
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32 return True
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33 except:
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34 return False
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35
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36 checks = {
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37 "symlink": (has_symlink, "symbolic links"),
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38 "fifo": (has_fifo, "named pipes"),
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39 "execbit": (has_executablebit, "executable bit"),
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40 "eol-in-paths": (has_eol_in_paths, "end-of-lines in paths"),
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41 }
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42
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43 def list_features():
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44 for name, feature in checks.iteritems():
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45 desc = feature[1]
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46 print name + ':', desc
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47
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48 parser = optparse.OptionParser("%prog [options] [features]")
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49 parser.add_option("--list-features", action="store_true",
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50 help="list available features")
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51 parser.add_option("-q", "--quiet", action="store_true",
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52 help="check features silently")
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53
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54 if __name__ == '__main__':
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55 options, args = parser.parse_args()
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56 if options.list_features:
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57 list_features()
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58 sys.exit(0)
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59
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60 quiet = options.quiet
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61
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62 failures = 0
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63
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64 def error(msg):
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65 global failures
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66 if not quiet:
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67 sys.stderr.write(msg + '\n')
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68 failures += 1
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69
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70 for feature in args:
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71 negate = feature.startswith('no-')
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72 if negate:
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73 feature = feature[3:]
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74
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75 if feature not in checks:
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76 error('hghave: unknown feature: ' + feature)
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77 continue
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78
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79 check, desc = checks[feature]
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80 if not negate and not check():
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81 error('hghave: missing feature: ' + desc)
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82 elif negate and check():
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83 error('hghave: unexpected feature: ' + desc)
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84
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85 if failures != 0:
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86 sys.exit(1)
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87
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88