Mercurial > public > mercurial-scm > hg-stable

annotate mercurial/util.py @ 740:d2422f10c136

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Merge from BOS manifest hash: 2276dbd96bb4221e579c871a1de2403c92c85659
author mpm@selenic.com
date Wed, 20 Jul 2005 20:00:29 -0500
parents 574869103985 8db4d406b3d3
children 092937de2ad7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # util.py - utility functions and platform specfic implementations
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2 #
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3 # Copyright 2005 K. Thananchayan <thananck@yahoo.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 import os, errno
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9 from demandload import *
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10 demandload(globals(), "re")
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11
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12 def unique(g):
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13 seen = {}
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14 for f in g:
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15 if f not in seen:
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16 seen[f] = 1
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17 yield f
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18
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19 class CommandError(Exception): pass
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20
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21 def explain_exit(code):
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22 """return a 2-tuple (desc, code) describing a process's status"""
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23 if os.WIFEXITED(code):
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24 val = os.WEXITSTATUS(code)
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25 return "exited with status %d" % val, val
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26 elif os.WIFSIGNALED(code):
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27 val = os.WTERMSIG(code)
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28 return "killed by signal %d" % val, val
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29 elif os.WIFSTOPPED(code):
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30 val = os.WSTOPSIG(code)
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31 return "stopped by signal %d" % val, val
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32 raise ValueError("invalid exit code")
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33
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34 def always(fn): return True
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35 def never(fn): return False
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36
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37 def globre(pat, head = '^', tail = '$'):
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38 "convert a glob pattern into a regexp"
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39 i, n = 0, len(pat)
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40 res = ''
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41 group = False
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42 def peek(): return i < n and pat[i]
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43 while i < n:
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44 c = pat[i]
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45 i = i+1
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46 if c == '*':
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47 if peek() == '*':
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48 i += 1
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49 res += '.*'
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50 else:
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51 res += '[^/]*'
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52 elif c == '?':
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53 res += '.'
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54 elif c == '[':
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55 j = i
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56 if j < n and pat[j] in '!]':
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57 j += 1
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58 while j < n and pat[j] != ']':
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59 j += 1
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60 if j >= n:
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61 res += '\\['
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62 else:
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63 stuff = pat[i:j].replace('\\','\\\\')
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64 i = j + 1
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65 if stuff[0] == '!':
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66 stuff = '^' + stuff[1:]
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67 elif stuff[0] == '^':
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68 stuff = '\\' + stuff
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69 res = '%s[%s]' % (res, stuff)
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70 elif c == '{':
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71 group = True
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72 res += '(?:'
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73 elif c == '}' and group:
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74 res += ')'
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75 group = False
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76 elif c == ',' and group:
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77 res += '|'
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78 else:
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79 res += re.escape(c)
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80 return head + res + tail
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81
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82 def system(cmd, errprefix=None):
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83 """execute a shell command that must succeed"""
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84 rc = os.system(cmd)
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85 if rc:
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86 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]),
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87 explain_exit(rc)[0])
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88 if errprefix:
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89 errmsg = "%s: %s" % (errprefix, errmsg)
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90 raise CommandError(errmsg)
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91
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92 def rename(src, dst):
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93 try:
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94 os.rename(src, dst)
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95 except:
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96 os.unlink(dst)
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97 os.rename(src, dst)
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98
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99 def copytree(src, dst, copyfile):
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100 """Copy a directory tree, files are copied using 'copyfile'."""
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101 names = os.listdir(src)
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102 os.mkdir(dst)
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103
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104 for name in names:
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105 srcname = os.path.join(src, name)
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106 dstname = os.path.join(dst, name)
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107 if os.path.isdir(srcname):
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108 copytree(srcname, dstname, copyfile)
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109 elif os.path.isfile(srcname):
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110 copyfile(srcname, dstname)
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111 else:
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112 raise IOError("Not a regular file: %r" % srcname)
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113
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114 def _makelock_file(info, pathname):
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115 ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
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116 os.write(ld, info)
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117 os.close(ld)
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118
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119 def _readlock_file(pathname):
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120 return file(pathname).read()
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121
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122 # Platfor specific varients
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123 if os.name == 'nt':
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124 nulldev = 'NUL:'
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125
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126 def is_exec(f, last):
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127 return last
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128
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129 def set_exec(f, mode):
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130 pass
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131
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132 def pconvert(path):
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133 return path.replace("\\", "/")
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134
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135 makelock = _makelock_file
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136 readlock = _readlock_file
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137
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138 else:
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139 nulldev = '/dev/null'
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140
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141 def is_exec(f, last):
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142 return (os.stat(f).st_mode & 0100 != 0)
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143
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144 def set_exec(f, mode):
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145 s = os.stat(f).st_mode
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146 if (s & 0100 != 0) == mode:
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147 return
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148 if mode:
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149 # Turn on +x for every +r bit when making a file executable
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150 # and obey umask.
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151 umask = os.umask(0)
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152 os.umask(umask)
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153 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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154 else:
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155 os.chmod(f, s & 0666)
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156
419
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157 def pconvert(path):
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158 return path
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159
422
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160 def makelock(info, pathname):
704
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161 try:
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162 os.symlink(info, pathname)
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163 except OSError, why:
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164 if why.errno == errno.EEXIST:
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165 raise
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166 else:
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167 _makelock_file(info, pathname)
422
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168
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169 def readlock(pathname):
704
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170 try:
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171 return os.readlink(pathname)
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172 except OSError, why:
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173 if why.errno == errno.EINVAL:
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174 return _readlock_file(pathname)
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175 else:
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176 raise