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annotate mercurial/util.py @ 667:31a9aa890016

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A number of minor fixes to problems that pychecker found. # HG changeset patch # User mark.williamson@cl.cam.ac.uk # Node ID 55d38977b7f2e73b8c1090179928ac96c8922b90 # Parent b3bba126b04ab2f24274a1bcf5a224c6317c8e0d A number of minor fixes to problems that pychecker found.
author mark.williamson@cl.cam.ac.uk
date Sun, 10 Jul 2005 16:01:11 -0800
parents f6c6fa15ff70
children df78d8ccac4c 574869103985
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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
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9
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10 def unique(g):
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11 seen = {}
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12 for f in g:
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13 if f not in seen:
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14 seen[f] = 1
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15 yield f
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16
508
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17 class CommandError(Exception): pass
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18
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19 def explain_exit(code):
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20 """return a 2-tuple (desc, code) describing a process's status"""
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21 if os.WIFEXITED(code):
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22 val = os.WEXITSTATUS(code)
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23 return "exited with status %d" % val, val
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24 elif os.WIFSIGNALED(code):
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25 val = os.WTERMSIG(code)
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26 return "killed by signal %d" % val, val
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27 elif os.WIFSTOPPED(code):
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28 val = os.WSTOPSIG(code)
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29 return "stopped by signal %d" % val, val
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30 raise ValueError("invalid exit code")
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31
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32 def system(cmd, errprefix=None):
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33 """execute a shell command that must succeed"""
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34 rc = os.system(cmd)
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35 if rc:
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36 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]),
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37 explain_exit(rc)[0])
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38 if errprefix:
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39 errmsg = "%s: %s" % (errprefix, errmsg)
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40 raise CommandError(errmsg)
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41
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42 def rename(src, dst):
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43 try:
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44 os.rename(src, dst)
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45 except:
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46 os.unlink(dst)
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47 os.rename(src, dst)
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48
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49 # Platfor specific varients
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50 if os.name == 'nt':
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51 nulldev = 'NUL:'
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52
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53 def is_exec(f, last):
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54 return last
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55
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56 def set_exec(f, mode):
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57 pass
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58
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59 def pconvert(path):
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60 return path.replace("\\", "/")
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61
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62 def makelock(info, pathname):
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63 ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
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64 os.write(ld, info)
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65 os.close(ld)
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66
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67 def readlock(pathname):
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68 return file(pathname).read()
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69
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70 else:
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71 nulldev = '/dev/null'
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72
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73 def is_exec(f, last):
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74 return (os.stat(f).st_mode & 0100 != 0)
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75
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76 def set_exec(f, mode):
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77 s = os.stat(f).st_mode
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78 if (s & 0100 != 0) == mode:
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79 return
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80 if mode:
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81 # Turn on +x for every +r bit when making a file executable
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82 # and obey umask.
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83 umask = os.umask(0)
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84 os.umask(umask)
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85 os.chmod(f, s | (s & 0444) >> 2 & ~umask)
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86 else:
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87 os.chmod(f, s & 0666)
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88
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89 def pconvert(path):
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90 return path
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91
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92 def makelock(info, pathname):
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93 os.symlink(info, pathname)
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94
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95 def readlock(pathname):
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96 return os.readlink(pathname)