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# This module was originally part of distutils.
from BuildManager import *
import os
__all__ = ["copy_file", "move_file"]
# 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
BuildManagerFileError. 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 Error, "could not open %s: %s" % (src, errstr)
try:
fdst = open(dst, 'wb')
except os.error, (errno, errstr):
raise Error, "could not create %s: %s" % (dst, errstr)
while 1:
try:
buf = fsrc.read(buffer_size)
except os.error, (errno, errstr):
raise Error, "could not read from %s: %s" % (src, errstr)
if not buf:
break
try:
fdst.write(buf)
except os.error, (errno, errstr):
raise Error, "could not write to %s: %s" % (dst, errstr)
finally:
if fdst:
fdst.close()
if fsrc:
fsrc.close()
def copy_file (src, dst, preserve_mode=1, preserve_times=1, link=None,
dryrun=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.
'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.
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 'dryrun' true).
"""
from stat import ST_ATIME, ST_MTIME, ST_MODE, S_IMODE
if not os.path.isfile(src):
raise Error, "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)
try:
action = _copy_action[link]
except KeyError:
raise ValueError, "invalid value '%s' for 'link' argument" % link
if os.path.basename(dst) == os.path.basename(src):
logger.info("%s %s to %s" % (action, src, dir))
else:
logger.info("%s %s to %s" % (action, src, dst))
if dryrun:
return (dst, 1)
# If linking (hard or symbolic), use the appropriate system call
# (Unix only, of course, but that's the caller's responsibility)
if 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 (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)
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)
def move_file (src, dst, dryrun=False):
"""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
logger.info("moving %s to %s" % (src, dst))
if dryrun:
return dst
if not isfile(src):
raise Error, "can't move %s: not a regular file" % src
if isdir(dst):
dst = os.path.join(dst, basename(src))
elif exists(dst):
raise Error, "can't move %s: destination %s already exists" % \
(src, dst)
if not isdir(dirname(dst)):
raise Error, "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 Error, "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 Error, "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")
for line in contents:
f.write(line + "\n")
f.close()
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