[Distutils] Windows wizards: I need porting help!
Greg Ward
gward@cnri.reston.va.us
Sun, 3 Oct 1999 17:31:15 -0400
Anyone who is a reasonably competent Windows/Python programmer can help
me out here. (At least) two functions in the distutils.util module need
help: 'mkpath()' and 'move_file()'. Actually, 'mkpath()' might be
working fine now, but I'd like some of you Windows folks to take a look
at it, beat on it, make sure it'll really work. Here's the code:
------------------------------------------------------------------------
# cache for by mkpath() -- in addition to cheapening redundant calls,
# eliminates redundant "creating /foo/bar/baz" messages in dry-run mode
PATH_CREATED = {}
# I don't use os.makedirs because a) it's new to Python 1.5.2, and
# b) it blows up if the directory already exists (I want to silently
# succeed in that case).
def mkpath (name, mode=0777, verbose=0, dry_run=0):
"""Create a directory and any missing ancestor directories. If the
directory already exists, return silently. Raise
DistutilsFileError if unable to create some directory along the
way (eg. some sub-path exists, but is a file rather than a
directory). If 'verbose' is true, print a one-line summary of
each mkdir to stdout."""
global PATH_CREATED
# XXX what's the better way to handle verbosity? print as we create
# each directory in the path (the current behaviour), or only announce
# the creation of the whole path? (quite easy to do the latter since
# we're not using a recursive algorithm)
name = os.path.normpath (name)
if os.path.isdir (name):
return
if PATH_CREATED.get (name):
return
(head, tail) = os.path.split (name)
tails = [tail] # stack of lone dirs to create
while head and tail and not os.path.isdir (head):
#print "splitting '%s': " % head,
(head, tail) = os.path.split (head)
#print "to ('%s','%s')" % (head, tail)
tails.insert (0, tail) # push next higher dir onto stack
#print "stack of tails:", tails
# now 'head' contains the deepest directory that already exists
# (that is, the child of 'head' in 'name' is the highest directory
# that does *not* exist)
for d in tails:
#print "head = %s, d = %s: " % (head, d),
head = os.path.join (head, d)
if PATH_CREATED.get (head):
continue
if verbose:
print "creating", head
if not dry_run:
try:
os.mkdir (head)
except os.error, (errno, errstr):
raise DistutilsFileError, "%s: %s" % (head, errstr)
PATH_CREATED[head] = 1
# mkpath ()
------------------------------------------------------------------------
The other one, 'move_file()', almost certainly has portability
problems. Please read it, bash on it, and help me fix it! Here's the
code for it:
------------------------------------------------------------------------
def move_file (src, dst,
verbose=0,
dry_run=0):
"""Move a file 'src' to 'dst'. If 'dst' is a directory, the file
will be moved into it with the same name; otherwise, 'src' is
just renamed to 'dst'. Return the new full name of the file.
Handles cross-device moves on Unix using
'copy_file()'. What about other systems???"""
from os.path import exists, isfile, isdir, basename, dirname
if verbose:
print "moving %s -> %s" % (src, dst)
if dry_run:
return dst
if not isfile (src):
raise DistutilsFileError, \
"can't move '%s': not a regular file" % src
if isdir (dst):
dst = os.path.join (dst, basename (src))
elif exists (dst):
raise DistutilsFileError, \
"can't move '%s': destination '%s' already exists" % \
(src, dst)
if not isdir (dirname (dst)):
raise DistutilsFileError, \
"can't move '%s': destination '%s' not a valid path" % \
(src, dst)
copy_it = 0
try:
os.rename (src, dst)
except os.error, (num, msg):
if num == errno.EXDEV:
copy_it = 1
else:
raise DistutilsFileError, \
"couldn't move '%s' to '%s': %s" % (src, dst, msg)
if copy_it:
copy_file (src, dst)
try:
os.unlink (src)
except os.error, (num, msg):
try:
os.unlink (dst)
except os.error:
pass
raise DistutilsFileError, \
("couldn't move '%s' to '%s' by copy/delete: " +
"delete '%s' failed: %s") % \
(src, dst, src, msg)
return dst
# move_file ()
------------------------------------------------------------------------
Thanks!
Greg
--
Greg Ward - software developer gward@cnri.reston.va.us
Corporation for National Research Initiatives
1895 Preston White Drive voice: +1-703-620-8990
Reston, Virginia, USA 20191-5434 fax: +1-703-620-0913