mirror of
https://github.com/python/cpython.git
synced 2024-12-15 12:54:31 +08:00
239 lines
8.0 KiB
Python
239 lines
8.0 KiB
Python
"""distutils.file_util
|
|
|
|
Utility functions for operating on single files.
|
|
"""
|
|
|
|
import os
|
|
from distutils.errors import DistutilsFileError
|
|
from distutils import log
|
|
|
|
# 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 OSError as e:
|
|
raise DistutilsFileError("could not open '%s': %s" % (src, e.strerror))
|
|
|
|
if os.path.exists(dst):
|
|
try:
|
|
os.unlink(dst)
|
|
except OSError as e:
|
|
raise DistutilsFileError(
|
|
"could not delete '%s': %s" % (dst, e.strerror))
|
|
|
|
try:
|
|
fdst = open(dst, 'wb')
|
|
except OSError as e:
|
|
raise DistutilsFileError(
|
|
"could not create '%s': %s" % (dst, e.strerror))
|
|
|
|
while True:
|
|
try:
|
|
buf = fsrc.read(buffer_size)
|
|
except OSError as e:
|
|
raise DistutilsFileError(
|
|
"could not read from '%s': %s" % (src, e.strerror))
|
|
|
|
if not buf:
|
|
break
|
|
|
|
try:
|
|
fdst.write(buf)
|
|
except OSError as e:
|
|
raise DistutilsFileError(
|
|
"could not write to '%s': %s" % (dst, e.strerror))
|
|
finally:
|
|
if fdst:
|
|
fdst.close()
|
|
if fsrc:
|
|
fsrc.close()
|
|
|
|
def copy_file(src, dst, preserve_mode=1, preserve_times=1, update=0,
|
|
link=None, verbose=1, 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'.
|
|
|
|
'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 available. If hardlink fails, falls back to
|
|
_copy_file_contents().
|
|
|
|
Under Mac OS, uses the native file copy function in macostools; on
|
|
other systems, uses '_copy_file_contents()' to copy file contents.
|
|
|
|
Return a tuple (dest_name, copied): 'dest_name' is the actual name of
|
|
the output file, and 'copied' is true if the file was copied (or would
|
|
have been copied, if 'dry_run' true).
|
|
"""
|
|
# 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 distutils.dep_util import newer
|
|
from stat import ST_ATIME, ST_MTIME, ST_MODE, S_IMODE
|
|
|
|
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 >= 1:
|
|
log.debug("not copying %s (output up-to-date)", src)
|
|
return (dst, 0)
|
|
|
|
try:
|
|
action = _copy_action[link]
|
|
except KeyError:
|
|
raise ValueError("invalid value '%s' for 'link' argument" % link)
|
|
|
|
if verbose >= 1:
|
|
if os.path.basename(dst) == os.path.basename(src):
|
|
log.info("%s %s -> %s", action, src, dir)
|
|
else:
|
|
log.info("%s %s -> %s", action, src, dst)
|
|
|
|
if dry_run:
|
|
return (dst, 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)):
|
|
try:
|
|
os.link(src, dst)
|
|
return (dst, 1)
|
|
except OSError:
|
|
# If hard linking fails, fall back on copying file
|
|
# (some special filesystems don't support hard linking
|
|
# even under Unix, see issue #8876).
|
|
pass
|
|
elif link == 'sym':
|
|
if not (os.path.exists(dst) and os.path.samefile(src, dst)):
|
|
os.symlink(src, dst)
|
|
return (dst, 1)
|
|
|
|
# Otherwise (non-Mac, not linking), copy the file contents and
|
|
# (optionally) copy the times and mode.
|
|
_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 (dst, 1)
|
|
|
|
|
|
# XXX I suspect this is Unix-specific -- need porting help!
|
|
def move_file (src, dst,
|
|
verbose=1,
|
|
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
|
|
import errno
|
|
|
|
if verbose >= 1:
|
|
log.info("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 = False
|
|
try:
|
|
os.rename(src, dst)
|
|
except OSError as e:
|
|
(num, msg) = e.args
|
|
if num == errno.EXDEV:
|
|
copy_it = True
|
|
else:
|
|
raise DistutilsFileError(
|
|
"couldn't move '%s' to '%s': %s" % (src, dst, msg))
|
|
|
|
if copy_it:
|
|
copy_file(src, dst, verbose=verbose)
|
|
try:
|
|
os.unlink(src)
|
|
except OSError as e:
|
|
(num, msg) = e.args
|
|
try:
|
|
os.unlink(dst)
|
|
except OSError:
|
|
pass
|
|
raise DistutilsFileError(
|
|
"couldn't move '%s' to '%s' by copy/delete: "
|
|
"delete '%s' failed: %s"
|
|
% (src, dst, src, msg))
|
|
return dst
|
|
|
|
|
|
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")
|
|
try:
|
|
for line in contents:
|
|
f.write(line + "\n")
|
|
finally:
|
|
f.close()
|