Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/util.py @ 595:c2c2c6d617bd
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author | mpm@selenic.com |
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date | Sun, 03 Jul 2005 11:41:43 -0800 |
parents | f6c6fa15ff70 |
children | 31a9aa890016 |
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 |
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9 |
556 | 10 def unique(g): |
11 seen = {} | |
12 for f in g: | |
13 if f not in seen: | |
14 seen[f] = 1 | |
15 yield f | |
16 | |
508 | 17 class CommandError(Exception): pass |
18 | |
19 def explain_exit(code): | |
20 """return a 2-tuple (desc, code) describing a process's status""" | |
21 if os.WIFEXITED(code): | |
22 val = os.WEXITSTATUS(code) | |
23 return "exited with status %d" % val, val | |
24 elif os.WIFSIGNALED(code): | |
25 val = os.WTERMSIG(code) | |
26 return "killed by signal %d" % val, val | |
27 elif os.WIFSTOPPED(code): | |
28 val = os.STOPSIG(code) | |
29 return "stopped by signal %d" % val, val | |
30 raise ValueError("invalid exit code") | |
515 | 31 |
521 | 32 def system(cmd, errprefix=None): |
508 | 33 """execute a shell command that must succeed""" |
34 rc = os.system(cmd) | |
35 if rc: | |
521 | 36 errmsg = "%s %s" % (os.path.basename(cmd.split(None, 1)[0]), |
37 explain_exit(rc)[0]) | |
38 if errprefix: | |
39 errmsg = "%s: %s" % (errprefix, errmsg) | |
508 | 40 raise CommandError(errmsg) |
41 | |
421 | 42 def rename(src, dst): |
43 try: | |
44 os.rename(src, dst) | |
45 except: | |
46 os.unlink(dst) | |
47 os.rename(src, dst) | |
48 | |
49 # Platfor specific varients | |
419
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50 if os.name == 'nt': |
461 | 51 nulldev = 'NUL:' |
52 | |
441 | 53 def is_exec(f, last): |
54 return last | |
55 | |
56 def set_exec(f, mode): | |
57 pass | |
515 | 58 |
419
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59 def pconvert(path): |
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60 return path.replace("\\", "/") |
422
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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() |
461 | 69 |
419
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70 else: |
461 | 71 nulldev = '/dev/null' |
72 | |
441 | 73 def is_exec(f, last): |
74 return (os.stat(f).st_mode & 0100 != 0) | |
75 | |
76 def set_exec(f, mode): | |
77 s = os.stat(f).st_mode | |
78 if (s & 0100 != 0) == mode: | |
79 return | |
80 if mode: | |
81 # Turn on +x for every +r bit when making a file executable | |
82 # and obey umask. | |
83 umask = os.umask(0) | |
84 os.umask(umask) | |
85 os.chmod(f, s | (s & 0444) >> 2 & ~umask) | |
86 else: | |
87 os.chmod(f, s & 0666) | |
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) |