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file_util.py

"""distutils.file_util

Utility functions for operating on single files.
"""

import os

from ._log import log
from .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):  # noqa: C901
    """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(f"could not open '{src}': {e.strerror}")

if os.path.exists(dst):
            try:
                os.unlink(dst)
            except OSError as e:
                raise DistutilsFileError(f"could not delete '{dst}': {e.strerror}")

try:
            fdst = open(dst, 'wb')
        except OSError as e:
            raise DistutilsFileError(f"could not create '{dst}': {e.strerror}")

while True:
            try:
                buf = fsrc.read(buffer_size)
            except OSError as e:
                raise DistutilsFileError(f"could not read from '{src}': {e.strerror}")

if not buf:
                break

try:
                fdst.write(buf)
            except OSError as e:
                raise DistutilsFileError(f"could not write to '{dst}': {e.strerror}")
    finally:
        if fdst:
            fdst.close()
        if fsrc:
            fsrc.close()

def copy_file(  # noqa: C901
    src,
    dst,
    preserve_mode=True,
    preserve_times=True,
    update=False,
    link=None,
    verbose=True,
    dry_run=False,
):
    """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._modified import newer
    from stat import S_IMODE, ST_ATIME, ST_MODE, ST_MTIME

if not os.path.isfile(src):
        raise DistutilsFileError(
            f"can't copy '{src}': doesn't exist or not a regular file"
        )

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, False)

try:
        action = _copy_action[link]
    except KeyError:
        raise ValueError(f"invalid value '{link}' for 'link' argument")

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, True)

# 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)
            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
            else:
                return (dst, True)
    elif link == 'sym':
        if not (os.path.exists(dst) and os.path.samefile(src, dst)):
            os.symlink(src, dst)
            return (dst, True)

# 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, True)

# XXX I suspect this is Unix-specific -- need porting help!
def move_file(src, dst, verbose=True, dry_run=False):  # noqa: C901
    """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???
    """
    import errno
    from os.path import basename, dirname, exists, isdir, isfile

if verbose >= 1:
        log.info("moving %s -> %s", src, dst)

if dry_run:
        return dst

if not isfile(src):
        raise DistutilsFileError(f"can't move '{src}': not a regular file")

if isdir(dst):
        dst = os.path.join(dst, basename(src))
    elif exists(dst):
        raise DistutilsFileError(
            f"can't move '{src}': destination '{dst}' already exists"
        )

if not isdir(dirname(dst)):
        raise DistutilsFileError(
            f"can't move '{src}': destination '{dst}' not a valid path"
        )

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(f"couldn't move '{src}' to '{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(
                f"couldn't move '{src}' to '{dst}' by copy/delete: "
                f"delete '{src}' failed: {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.
    """
    with open(filename, 'w', encoding='utf-8') as f:
        f.writelines(line + '\n' for line in contents)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-05-15 05:00:36
..	dir	-	root/root	0755	2025-05-15 05:00:36
__pycache__	dir	-	root/root	0755	2025-05-15 05:00:48
command	dir	-	root/root	0755	2025-05-15 05:00:36
compat	dir	-	root/root	0755	2025-05-15 05:00:42
compilers	dir	-	root/root	0755	2025-05-15 05:00:34
tests	dir	-	root/root	0755	2025-05-15 05:00:42
__init__.py	text/x-script.python	359 B	root/root	0644	2025-04-17 01:10:58
_log.py	text/plain	42 B	root/root	0644	2025-04-17 01:10:58
_macos_compat.py	text/x-script.python	239 B	root/root	0644	2025-04-17 01:10:58
_modified.py	text/plain	3.14 KB	root/root	0644	2025-04-17 01:10:58
_msvccompiler.py	text/x-script.python	335 B	root/root	0644	2025-04-17 01:10:58
archive_util.py	text/plain	8.68 KB	root/root	0644	2025-04-17 01:10:58
ccompiler.py	text/x-script.python	524 B	root/root	0644	2025-04-17 01:10:58
cmd.py	text/plain	21.67 KB	root/root	0644	2025-04-17 01:10:58
core.py	text/plain	9.14 KB	root/root	0644	2025-04-17 01:10:58
cygwinccompiler.py	text/x-script.python	594 B	root/root	0644	2025-04-17 01:10:58
debug.py	text/plain	139 B	root/root	0644	2025-04-17 01:10:58
dep_util.py	text/x-script.python	349 B	root/root	0644	2025-04-17 01:10:58
dir_util.py	text/plain	7.07 KB	root/root	0644	2025-04-17 01:10:58
dist.py	text/plain	54.49 KB	root/root	0644	2025-04-17 01:10:58
errors.py	text/plain	3.02 KB	root/root	0644	2025-04-17 01:10:58
extension.py	text/plain	10.89 KB	root/root	0644	2025-04-17 01:10:58
fancy_getopt.py	text/plain	17.48 KB	root/root	0644	2025-04-17 01:10:58
file_util.py	text/plain	7.79 KB	root/root	0644	2025-04-17 01:10:58
filelist.py	text/plain	14.98 KB	root/root	0644	2025-04-17 01:10:58
log.py	text/plain	1.17 KB	root/root	0644	2025-04-17 01:10:58
spawn.py	text/plain	3.99 KB	root/root	0644	2025-04-17 01:10:58
sysconfig.py	text/plain	19.27 KB	root/root	0644	2025-04-17 01:10:58
text_file.py	text/plain	11.82 KB	root/root	0644	2025-04-17 01:10:58
unixccompiler.py	text/x-script.python	212 B	root/root	0644	2025-04-17 01:10:58
util.py	text/plain	17.67 KB	root/root	0644	2025-04-17 01:10:58
version.py	text/x-script.python	12.32 KB	root/root	0644	2025-04-17 01:10:58
versionpredicate.py	text/plain	5.08 KB	root/root	0644	2025-04-17 01:10:58
zosccompiler.py	text/x-script.python	58 B	root/root	0644	2025-04-17 01:10:58

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