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1 | 1 | # util.py - utility functions and platform specfic implementations |
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2 | 2 | # |
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3 | 3 | # Copyright 2005 K. Thananchayan <thananck@yahoo.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms |
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6 | 6 | # of the GNU General Public License, incorporated herein by reference. |
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7 | 7 | |
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8 | 8 | import os |
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9 | 9 | |
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10 | 10 | class CommandError(Exception): pass |
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11 | 11 | |
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12 | 12 | def explain_exit(code): |
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13 | 13 | """return a 2-tuple (desc, code) describing a process's status""" |
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14 | 14 | if os.WIFEXITED(code): |
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15 | 15 | val = os.WEXITSTATUS(code) |
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16 | 16 | return "exited with status %d" % val, val |
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17 | 17 | elif os.WIFSIGNALED(code): |
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18 | 18 | val = os.WTERMSIG(code) |
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19 | 19 | return "killed by signal %d" % val, val |
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20 | 20 | elif os.WIFSTOPPED(code): |
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21 | 21 | val = os.STOPSIG(code) |
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22 | 22 | return "stopped by signal %d" % val, val |
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23 | 23 | raise ValueError("invalid exit code") |
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24 | 24 | |
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25 |
def system(cmd, errprefix |
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25 | def system(cmd, errprefix=None): | |
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26 | 26 | """execute a shell command that must succeed""" |
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27 | 27 | rc = os.system(cmd) |
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28 | 28 | if rc: |
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29 |
errmsg = "%s |
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30 |
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29 | errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]), | |
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30 | explain_exit(rc)[0]) | |
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31 | if errprefix: | |
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32 | errmsg = "%s: %s" % (errprefix, errmsg) | |
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31 | 33 | raise CommandError(errmsg) |
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32 | 34 | |
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33 | 35 | def rename(src, dst): |
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34 | 36 | try: |
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35 | 37 | os.rename(src, dst) |
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36 | 38 | except: |
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37 | 39 | os.unlink(dst) |
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38 | 40 | os.rename(src, dst) |
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39 | 41 | |
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40 | 42 | # Platfor specific varients |
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41 | 43 | if os.name == 'nt': |
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42 | 44 | nulldev = 'NUL:' |
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43 | 45 | |
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44 | 46 | def is_exec(f, last): |
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45 | 47 | return last |
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46 | 48 | |
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47 | 49 | def set_exec(f, mode): |
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48 | 50 | pass |
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49 | 51 | |
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50 | 52 | def pconvert(path): |
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51 | 53 | return path.replace("\\", "/") |
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52 | 54 | |
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53 | 55 | def makelock(info, pathname): |
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54 | 56 | ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL) |
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55 | 57 | os.write(ld, info) |
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56 | 58 | os.close(ld) |
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57 | 59 | |
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58 | 60 | def readlock(pathname): |
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59 | 61 | return file(pathname).read() |
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60 | 62 | |
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61 | 63 | else: |
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62 | 64 | nulldev = '/dev/null' |
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63 | 65 | |
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64 | 66 | def is_exec(f, last): |
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65 | 67 | return (os.stat(f).st_mode & 0100 != 0) |
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66 | 68 | |
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67 | 69 | def set_exec(f, mode): |
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68 | 70 | s = os.stat(f).st_mode |
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69 | 71 | if (s & 0100 != 0) == mode: |
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70 | 72 | return |
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71 | 73 | if mode: |
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72 | 74 | # Turn on +x for every +r bit when making a file executable |
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73 | 75 | # and obey umask. |
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74 | 76 | umask = os.umask(0) |
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75 | 77 | os.umask(umask) |
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76 | 78 | os.chmod(f, s | (s & 0444) >> 2 & ~umask) |
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77 | 79 | else: |
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78 | 80 | os.chmod(f, s & 0666) |
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79 | 81 | |
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80 | 82 | def pconvert(path): |
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81 | 83 | return path |
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82 | 84 | |
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83 | 85 | def makelock(info, pathname): |
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84 | 86 | os.symlink(info, pathname) |
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85 | 87 | |
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86 | 88 | def readlock(pathname): |
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87 | 89 | return os.readlink(pathname) |
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