mirror of https://github.com/python/cpython.git
249 lines
7.9 KiB
Python
249 lines
7.9 KiB
Python
"""distutils.file_util
|
|
|
|
Utility functions for operating on single files."""
|
|
|
|
# created 2000/04/03, Greg Ward (extracted from util.py)
|
|
|
|
__revision__ = "$Id$"
|
|
|
|
import os
|
|
from distutils.errors import DistutilsFileError
|
|
|
|
|
|
# for generating verbose output in 'copy_file()'
|
|
_copy_action = { None: 'copying',
|
|
'hard': 'hard linking',
|
|
'sym': 'symbolically linking' }
|
|
|
|
|
|
def _copy_file_contents (src, dst, buffer_size=16*1024):
|
|
"""Copy the file 'src' to 'dst'; both must be filenames. Any error
|
|
opening either file, reading from 'src', or writing to 'dst',
|
|
raises DistutilsFileError. Data is read/written in chunks of
|
|
'buffer_size' bytes (default 16k). No attempt is made to handle
|
|
anything apart from regular files."""
|
|
|
|
# Stolen from shutil module in the standard library, but with
|
|
# custom error-handling added.
|
|
|
|
fsrc = None
|
|
fdst = None
|
|
try:
|
|
try:
|
|
fsrc = open(src, 'rb')
|
|
except os.error, (errno, errstr):
|
|
raise DistutilsFileError, \
|
|
"could not open '%s': %s" % (src, errstr)
|
|
|
|
try:
|
|
fdst = open(dst, 'wb')
|
|
except os.error, (errno, errstr):
|
|
raise DistutilsFileError, \
|
|
"could not create '%s': %s" % (dst, errstr)
|
|
|
|
while 1:
|
|
try:
|
|
buf = fsrc.read (buffer_size)
|
|
except os.error, (errno, errstr):
|
|
raise DistutilsFileError, \
|
|
"could not read from '%s': %s" % (src, errstr)
|
|
|
|
if not buf:
|
|
break
|
|
|
|
try:
|
|
fdst.write(buf)
|
|
except os.error, (errno, errstr):
|
|
raise DistutilsFileError, \
|
|
"could not write to '%s': %s" % (dst, errstr)
|
|
|
|
finally:
|
|
if fdst:
|
|
fdst.close()
|
|
if fsrc:
|
|
fsrc.close()
|
|
|
|
# _copy_file_contents()
|
|
|
|
|
|
def copy_file (src, dst,
|
|
preserve_mode=1,
|
|
preserve_times=1,
|
|
update=0,
|
|
link=None,
|
|
verbose=0,
|
|
dry_run=0):
|
|
|
|
"""Copy a file 'src' to 'dst'. If 'dst' is a directory, then 'src'
|
|
is copied there with the same name; otherwise, it must be a
|
|
filename. (If the file exists, it will be ruthlessly clobbered.)
|
|
If 'preserve_mode' is true (the default), the file's mode (type
|
|
and permission bits, or whatever is analogous on the current
|
|
platform) is copied. If 'preserve_times' is true (the default),
|
|
the last-modified and last-access times are copied as well. If
|
|
'update' is true, 'src' will only be copied if 'dst' does not
|
|
exist, or if 'dst' does exist but is older than 'src'. If
|
|
'verbose' is true, then a one-line summary of the copy will be
|
|
printed to stdout.
|
|
|
|
'link' allows you to make hard links (os.link) or symbolic links
|
|
(os.symlink) instead of copying: set it to "hard" or "sym"; if it
|
|
is None (the default), files are copied. Don't set 'link' on
|
|
systems that don't support it: 'copy_file()' doesn't check if
|
|
hard or symbolic linking is availalble.
|
|
|
|
Under Mac OS, uses the native file copy function in macostools;
|
|
on other systems, uses '_copy_file_contents()' to copy file
|
|
contents.
|
|
|
|
Return true if the file was copied (or would have been copied),
|
|
false otherwise (ie. 'update' was true and the destination is
|
|
up-to-date)."""
|
|
|
|
# XXX if the destination file already exists, we clobber it if
|
|
# copying, but blow up if linking. Hmmm. And I don't know what
|
|
# macostools.copyfile() does. Should definitely be consistent, and
|
|
# should probably blow up if destination exists and we would be
|
|
# changing it (ie. it's not already a hard/soft link to src OR
|
|
# (not update) and (src newer than dst).
|
|
|
|
from stat import *
|
|
from distutils.dep_util import newer
|
|
|
|
if not os.path.isfile (src):
|
|
raise DistutilsFileError, \
|
|
"can't copy '%s': doesn't exist or not a regular file" % src
|
|
|
|
if os.path.isdir (dst):
|
|
dir = dst
|
|
dst = os.path.join (dst, os.path.basename (src))
|
|
else:
|
|
dir = os.path.dirname (dst)
|
|
|
|
if update and not newer (src, dst):
|
|
if verbose:
|
|
print "not copying %s (output up-to-date)" % src
|
|
return 0
|
|
|
|
try:
|
|
action = _copy_action[link]
|
|
except KeyError:
|
|
raise ValueError, \
|
|
"invalid value '%s' for 'link' argument" % link
|
|
if verbose:
|
|
print "%s %s -> %s" % (action, src, dir)
|
|
|
|
if dry_run:
|
|
return 1
|
|
|
|
# On a Mac, use the native file copy routine
|
|
if os.name == 'mac':
|
|
import macostools
|
|
try:
|
|
macostools.copy (src, dst, 0, preserve_times)
|
|
except os.error, exc:
|
|
raise DistutilsFileError, \
|
|
"could not copy '%s' to '%s': %s" % (src, dst, exc[-1])
|
|
|
|
# If linking (hard or symbolic), use the appropriate system call
|
|
# (Unix only, of course, but that's the caller's responsibility)
|
|
elif link == 'hard':
|
|
if not (os.path.exists (dst) and os.path.samefile (src, dst)):
|
|
os.link (src, dst)
|
|
elif link == 'sym':
|
|
if not (os.path.exists (dst) and os.path.samefile (src, dst)):
|
|
os.symlink (src, dst)
|
|
|
|
# Otherwise (non-Mac, not linking), copy the file contents and
|
|
# (optionally) copy the times and mode.
|
|
else:
|
|
_copy_file_contents (src, dst)
|
|
if preserve_mode or preserve_times:
|
|
st = os.stat (src)
|
|
|
|
# According to David Ascher <da@ski.org>, utime() should be done
|
|
# before chmod() (at least under NT).
|
|
if preserve_times:
|
|
os.utime (dst, (st[ST_ATIME], st[ST_MTIME]))
|
|
if preserve_mode:
|
|
os.chmod (dst, S_IMODE (st[ST_MODE]))
|
|
|
|
return 1
|
|
|
|
# copy_file ()
|
|
|
|
|
|
# XXX I suspect this is Unix-specific -- need porting help!
|
|
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 ()
|
|
|
|
|
|
def write_file (filename, contents):
|
|
"""Create a file with the specified name and write 'contents' (a
|
|
sequence of strings without line terminators) to it."""
|
|
|
|
f = open (filename, "w")
|
|
for line in contents:
|
|
f.write (line + "\n")
|
|
f.close ()
|