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1 # posix.py - Posix utility function implementations for Mercurial
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2 #
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3 # Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2, incorporated herein by reference.
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7
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8 from i18n import _
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9 import osutil
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10 import os, sys, errno, stat, getpass, pwd, grp
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11
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12 posixfile = file
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13 nulldev = '/dev/null'
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14 normpath = os.path.normpath
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15 samestat = os.path.samestat
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16 expandglobs = False
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17
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18 umask = os.umask(0)
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19 os.umask(umask)
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20
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21 def openhardlinks():
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22 '''return true if it is safe to hold open file handles to hardlinks'''
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23 return True
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24
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25 def rcfiles(path):
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26 rcs = [os.path.join(path, 'hgrc')]
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27 rcdir = os.path.join(path, 'hgrc.d')
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28 try:
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29 rcs.extend([os.path.join(rcdir, f)
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30 for f, kind in osutil.listdir(rcdir)
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31 if f.endswith(".rc")])
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32 except OSError:
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33 pass
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34 return rcs
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35
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36 def system_rcpath():
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37 path = []
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38 # old mod_python does not set sys.argv
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39 if len(getattr(sys, 'argv', [])) > 0:
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40 path.extend(rcfiles(os.path.dirname(sys.argv[0]) +
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41 '/../etc/mercurial'))
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42 path.extend(rcfiles('/etc/mercurial'))
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43 return path
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44
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45 def user_rcpath():
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46 return [os.path.expanduser('~/.hgrc')]
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47
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48 def parse_patch_output(output_line):
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49 """parses the output produced by patch and returns the filename"""
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50 pf = output_line[14:]
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51 if os.sys.platform == 'OpenVMS':
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52 if pf[0] == '`':
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53 pf = pf[1:-1] # Remove the quotes
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54 else:
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55 if pf.startswith("'") and pf.endswith("'") and " " in pf:
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56 pf = pf[1:-1] # Remove the quotes
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57 return pf
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58
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59 def sshargs(sshcmd, host, user, port):
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60 '''Build argument list for ssh'''
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61 args = user and ("%s@%s" % (user, host)) or host
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62 return port and ("%s -p %s" % (args, port)) or args
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63
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64 def is_exec(f):
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65 """check whether a file is executable"""
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66 return (os.lstat(f).st_mode & 0100 != 0)
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67
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68 def set_flags(f, l, x):
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69 s = os.lstat(f).st_mode
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70 if l:
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71 if not stat.S_ISLNK(s):
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72 # switch file to link
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73 data = file(f).read()
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74 os.unlink(f)
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75 try:
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76 os.symlink(data, f)
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77 except:
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78 # failed to make a link, rewrite file
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79 file(f, "w").write(data)
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80 # no chmod needed at this point
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81 return
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82 if stat.S_ISLNK(s):
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83 # switch link to file
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84 data = os.readlink(f)
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85 os.unlink(f)
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86 file(f, "w").write(data)
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87 s = 0666 & ~umask # avoid restatting for chmod
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88
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89 sx = s & 0100
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90 if x and not sx:
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91 # Turn on +x for every +r bit when making a file executable
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92 # and obey umask.
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93 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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94 elif not x and sx:
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95 # Turn off all +x bits
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96 os.chmod(f, s & 0666)
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97
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98 def set_binary(fd):
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99 pass
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100
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101 def pconvert(path):
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102 return path
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103
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104 def localpath(path):
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105 return path
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106
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107 def shellquote(s):
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108 if os.sys.platform == 'OpenVMS':
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109 return '"%s"' % s
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110 else:
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111 return "'%s'" % s.replace("'", "'\\''")
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112
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113 def quotecommand(cmd):
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114 return cmd
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115
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116 def popen(command, mode='r'):
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117 return os.popen(command, mode)
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118
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119 def testpid(pid):
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120 '''return False if pid dead, True if running or not sure'''
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121 if os.sys.platform == 'OpenVMS':
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122 return True
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123 try:
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124 os.kill(pid, 0)
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125 return True
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126 except OSError, inst:
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127 return inst.errno != errno.ESRCH
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128
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129 def explain_exit(code):
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130 """return a 2-tuple (desc, code) describing a process's status"""
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131 if os.WIFEXITED(code):
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132 val = os.WEXITSTATUS(code)
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133 return _("exited with status %d") % val, val
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134 elif os.WIFSIGNALED(code):
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135 val = os.WTERMSIG(code)
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136 return _("killed by signal %d") % val, val
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137 elif os.WIFSTOPPED(code):
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138 val = os.WSTOPSIG(code)
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139 return _("stopped by signal %d") % val, val
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140 raise ValueError(_("invalid exit code"))
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141
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142 def isowner(st):
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143 """Return True if the stat object st is from the current user."""
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144 return st.st_uid == os.getuid()
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145
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146 def find_exe(command):
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147 '''Find executable for command searching like which does.
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148 If command is a basename then PATH is searched for command.
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149 PATH isn't searched if command is an absolute or relative path.
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150 If command isn't found None is returned.'''
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151 if sys.platform == 'OpenVMS':
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152 return command
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153
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154 def findexisting(executable):
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155 'Will return executable if existing file'
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156 if os.path.exists(executable):
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157 return executable
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158 return None
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159
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160 if os.sep in command:
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161 return findexisting(command)
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162
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163 for path in os.environ.get('PATH', '').split(os.pathsep):
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164 executable = findexisting(os.path.join(path, command))
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165 if executable is not None:
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166 return executable
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167 return None
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168
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169 def set_signal_handler():
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170 pass
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171
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172 def statfiles(files):
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173 'Stat each file in files and yield stat or None if file does not exist.'
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174 lstat = os.lstat
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175 for nf in files:
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176 try:
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177 st = lstat(nf)
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178 except OSError, err:
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179 if err.errno not in (errno.ENOENT, errno.ENOTDIR):
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180 raise
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181 st = None
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182 yield st
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183
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184 def getuser():
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185 '''return name of current user'''
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186 return getpass.getuser()
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187
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188 def expand_glob(pats):
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189 '''On Windows, expand the implicit globs in a list of patterns'''
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190 return list(pats)
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191
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192 def username(uid=None):
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193 """Return the name of the user with the given uid.
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194
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195 If uid is None, return the name of the current user."""
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196
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197 if uid is None:
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198 uid = os.getuid()
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199 try:
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200 return pwd.getpwuid(uid)[0]
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201 except KeyError:
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202 return str(uid)
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203
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204 def groupname(gid=None):
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205 """Return the name of the group with the given gid.
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206
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207 If gid is None, return the name of the current group."""
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208
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209 if gid is None:
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210 gid = os.getgid()
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211 try:
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212 return grp.getgrgid(gid)[0]
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213 except KeyError:
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214 return str(gid)
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