Donn Cave wrote:
>In article <[EMAIL PROTECTED]>,
> <[EMAIL PROTECTED]> wrote:
>...
>> I used the python executable from the build directory to run the
>> following program:
>>
>> import os
>>
>> def main():
>> if not (os.path.exists("/")):
>> print "/ does not exist"
>> else:
>> print "/ exists"
>> if not (os.path.isdir("/")):
>> print "/ is not a directory"
>> else:
>> print "/ ok"
>>
>> if name == " main ":
>> main()
>>
>> The output is:
>>
>> / exists
>> / is not a directory
>>
>> It's the same for every (existing) directory name I try:
>os.path.isdir()
>> always returns false.
>>
>> It looks as if the stat results are not recognised: os.path.exists()
>> works, but all the functions os.path.isdir(), os.path.isfile() etc.
>> don't.
>>
>> Could anyone help me to solve the problem?
>
>Unless there are other Reliant users here ahead of you, some
>of it is going to be up to you. If you follow isdir() back,
>you'll find some hard-coded octal bitmask definitions, including
>S_IFDIR = 0040000.
>
>Check it out. Try to use that value the way they're using it,
>in C and in Python, and print out all the values involved.
>At worst, if C comes out wrong too, you may have a question
>that the vendor will be more likely to respond to.
First, thanks very much for your help. On the Reliant Unix system,
C and Python both use the value you mention above.
I added some debug prints to isdir in Lib/posixpath.py in the build
tree:
def isdir(path):
"""Test whether a path is a directory"""
try:
st = os.stat(path)
print "isdir: OK, path: %s" % path
print "st: %s" % st
print "size, mtime, atime, ctime, dev, ino:"
print "%s %s %s %s %s %s" % (st.st_size, st.st_mtime,
st.st_atime, st.st_ctime, st.st_dev, st.st_ino)
except os.error:
print "isdir: OS.ERROR, path: %s" % path
return False
return stat.S_ISDIR(st.st_mode)
and to S_ISDIR in Lib/stat.py:
def S_ISDIR(mode):
print "S_ISDIR: S_IFMT(mode): %s, S_IFDIR: %d" % (S_IFMT(mode),
S_IFDIR)
print "mode: %s" % mode
return S_IFMT(mode) == S_IFDIR
Then my sample program (see quote above) produces the following output:
isdir: OK, path: /usr/local/lib/python2.4/site-packages
st: (2, 1088705490076141L, 1050758L, 0, 1, 0, 4797493958154069376L,
870000000, 870000000, 0)
size, mtime, atime, ctime, dev, ino:
4797493958154069376 870000000 870000000 0 1050758 1088705490076141
S_ISDIR: S_IFMT(mode): 0, S_IFDIR: 16384
mode: 2
isdir: OK, path: /usr/local/lib/site-python
st: (2, 1088653950468589L, 1050758L, 0, 1, 0, 4797493958164069376L,
880000000, 880000000, 0)
size, mtime, atime, ctime, dev, ino:
4797493958164069376 880000000 880000000 0 1050758 1088653950468589
S_ISDIR: S_IFMT(mode): 0, S_IFDIR: 16384
mode: 2
/ exists
isdir: OK, path: /
st: (48, 8589951469L, 1050752L, 0, 0, 0, 4797500748297364352L,
120000000, 120000000, 6)
size, mtime, atime, ctime, dev, ino:
4797500748297364352 120000000 120000000 6 1050752 8589951469
S_ISDIR: S_IFMT(mode): 0, S_IFDIR: 16384
mode: 48
/ is not a directory
The stat values do not make any sense. It seems that the value used for
the mode is really the numbers of links (I created the two empty
/usr/local... directories to prevent the os.error exception):
$ ls -ldi /usr/local/lib/python2.4/>
2 drwxr-xr-x 48 root root 2560 May 14 09:02 /
253484 drwxr-xr-x 2 root other 96 May 25 08:46
/usr/local/lib/python2.4/site-packages
253472 drwxr-xr-x 2 root other 96 May 25 08:46
/usr/local/lib/site-python
I'm a very beginner with Python and I'm not at all familiar with the
build structure of Python. (I just wanted to setup a Subversion
repository and to run some contributed Python hook scripts.) It would
be very helpful if you could give me some hint in which source and
function the C stat() results are mapped to the stat values accessible
from Python. Then I can try a bit debugging there.
- Servatius
------------------------------------------------------------------------
Servatius Brandt Phone: +49 89 636-41504
Fujitsu Siemens Computers Fax: +49 89 636-48716
EP SW AD C++ Email: [EMAIL PROTECTED]
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