[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / lib / python2.4 / distutils / file_util.py

"""distutils.file_util

Utility functions for operating on single files.
"""

# This module should be kept compatible with Python 2.1.

__revision__ = "$Id: file_util.py,v 1.17 2004/11/10 22:23:14 loewis Exp $"

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 os.error, (errno, errstr):
            raise DistutilsFileError, \
                  "could not open '%s': %s" % (src, errstr)

        if os.path.exists(dst):
            try:
                os.unlink(dst)
            except os.error, (errno, errstr):
                raise DistutilsFileError, \
                      "could not delete '%s': %s" % (dst, 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'.

    '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 '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):
        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 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)

    # On Mac OS, 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 (dst, 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
    import errno

    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 = 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()
Commit	Line	Data
86530b38 AT	1	"""distutils.file_util
	2
	3	Utility functions for operating on single files.
	4	"""
	5
	6	# This module should be kept compatible with Python 2.1.
	7
	8	__revision__ = "$Id: file_util.py,v 1.17 2004/11/10 22:23:14 loewis Exp $"
	9
	10	import os
	11	from distutils.errors import DistutilsFileError
	12	from distutils import log
	13
	14	# for generating verbose output in 'copy_file()'
	15	_copy_action = { None: 'copying',
	16	'hard': 'hard linking',
	17	'sym': 'symbolically linking' }
	18
	19
	20	def _copy_file_contents (src, dst, buffer_size=16*1024):
	21	"""Copy the file 'src' to 'dst'; both must be filenames. Any error
	22	opening either file, reading from 'src', or writing to 'dst', raises
	23	DistutilsFileError. Data is read/written in chunks of 'buffer_size'
	24	bytes (default 16k). No attempt is made to handle anything apart from
	25	regular files.
	26	"""
	27	# Stolen from shutil module in the standard library, but with
	28	# custom error-handling added.
	29
	30	fsrc = None
	31	fdst = None
	32	try:
	33	try:
	34	fsrc = open(src, 'rb')
	35	except os.error, (errno, errstr):
	36	raise DistutilsFileError, \
	37	"could not open '%s': %s" % (src, errstr)
	38
	39	if os.path.exists(dst):
	40	try:
	41	os.unlink(dst)
	42	except os.error, (errno, errstr):
	43	raise DistutilsFileError, \
	44	"could not delete '%s': %s" % (dst, errstr)
	45
	46	try:
	47	fdst = open(dst, 'wb')
	48	except os.error, (errno, errstr):
	49	raise DistutilsFileError, \
	50	"could not create '%s': %s" % (dst, errstr)
	51
	52	while 1:
	53	try:
	54	buf = fsrc.read(buffer_size)
	55	except os.error, (errno, errstr):
	56	raise DistutilsFileError, \
	57	"could not read from '%s': %s" % (src, errstr)
	58
	59	if not buf:
	60	break
	61
	62	try:
	63	fdst.write(buf)
	64	except os.error, (errno, errstr):
65	raise DistutilsFileError, \
66	"could not write to '%s': %s" % (dst, errstr)
67
68	finally:
69	if fdst:
70	fdst.close()
71	if fsrc:
72	fsrc.close()
73
74	# _copy_file_contents()
75
76	def copy_file (src, dst,
77	preserve_mode=1,
78	preserve_times=1,
79	update=0,
80	link=None,
81	verbose=0,
82	dry_run=0):
83
84	"""Copy a file 'src' to 'dst'. If 'dst' is a directory, then 'src' is
85	copied there with the same name; otherwise, it must be a filename. (If
86	the file exists, it will be ruthlessly clobbered.) If 'preserve_mode'
87	is true (the default), the file's mode (type and permission bits, or
88	whatever is analogous on the current platform) is copied. If
89	'preserve_times' is true (the default), the last-modified and
90	last-access times are copied as well. If 'update' is true, 'src' will
91	only be copied if 'dst' does not exist, or if 'dst' does exist but is
92	older than 'src'.
93
94	'link' allows you to make hard links (os.link) or symbolic links
95	(os.symlink) instead of copying: set it to "hard" or "sym"; if it is
96	None (the default), files are copied. Don't set 'link' on systems that
97	don't support it: 'copy_file()' doesn't check if hard or symbolic
98	linking is available.
99
100	Under Mac OS, uses the native file copy function in macostools; on
101	other systems, uses '_copy_file_contents()' to copy file contents.
102
103	Return a tuple (dest_name, copied): 'dest_name' is the actual name of
104	the output file, and 'copied' is true if the file was copied (or would
105	have been copied, if 'dry_run' true).
106	"""
107	# XXX if the destination file already exists, we clobber it if
108	# copying, but blow up if linking. Hmmm. And I don't know what
109	# macostools.copyfile() does. Should definitely be consistent, and
110	# should probably blow up if destination exists and we would be
111	# changing it (ie. it's not already a hard/soft link to src OR
112	# (not update) and (src newer than dst).
113
114	from distutils.dep_util import newer
115	from stat import ST_ATIME, ST_MTIME, ST_MODE, S_IMODE
116
117	if not os.path.isfile(src):
118	raise DistutilsFileError, \
119	"can't copy '%s': doesn't exist or not a regular file" % src
120
121	if os.path.isdir(dst):
122	dir = dst
123	dst = os.path.join(dst, os.path.basename(src))
124	else:
125	dir = os.path.dirname(dst)
126
127	if update and not newer(src, dst):
128	log.debug("not copying %s (output up-to-date)", src)
129	return dst, 0
130
131	try:
132	action = _copy_action[link]
133	except KeyError:
134	raise ValueError, \
135	"invalid value '%s' for 'link' argument" % link
136	if os.path.basename(dst) == os.path.basename(src):
137	log.info("%s %s -> %s", action, src, dir)
138	else:
139	log.info("%s %s -> %s", action, src, dst)
140
141	if dry_run:
142	return (dst, 1)
143
144	# On Mac OS, use the native file copy routine
145	if os.name == 'mac':
146	import macostools
147	try:
148	macostools.copy(src, dst, 0, preserve_times)
149	except os.error, exc:
150	raise DistutilsFileError, \
151	"could not copy '%s' to '%s': %s" % (src, dst, exc[-1])
152
153	# If linking (hard or symbolic), use the appropriate system call
154	# (Unix only, of course, but that's the caller's responsibility)
155	elif link == 'hard':
156	if not (os.path.exists(dst) and os.path.samefile(src, dst)):
157	os.link(src, dst)
158	elif link == 'sym':
159	if not (os.path.exists(dst) and os.path.samefile(src, dst)):
160	os.symlink(src, dst)
161
162	# Otherwise (non-Mac, not linking), copy the file contents and
163	# (optionally) copy the times and mode.
164	else:
165	_copy_file_contents(src, dst)
166	if preserve_mode or preserve_times:
167	st = os.stat(src)
168
169	# According to David Ascher <da@ski.org>, utime() should be done
170	# before chmod() (at least under NT).
171	if preserve_times:
172	os.utime(dst, (st[ST_ATIME], st[ST_MTIME]))
173	if preserve_mode:
174	os.chmod(dst, S_IMODE(st[ST_MODE]))
175
176	return (dst, 1)
177
178	# copy_file ()
179
180
181	# XXX I suspect this is Unix-specific -- need porting help!
182	def move_file (src, dst,
183	verbose=0,
184	dry_run=0):
185
186	"""Move a file 'src' to 'dst'. If 'dst' is a directory, the file will
187	be moved into it with the same name; otherwise, 'src' is just renamed
188	to 'dst'. Return the new full name of the file.
189
190	Handles cross-device moves on Unix using 'copy_file()'. What about
191	other systems???
192	"""
193	from os.path import exists, isfile, isdir, basename, dirname
194	import errno
195
196	log.info("moving %s -> %s", src, dst)
197
198	if dry_run:
199	return dst
200
201	if not isfile(src):
202	raise DistutilsFileError, \
203	"can't move '%s': not a regular file" % src
204
205	if isdir(dst):
206	dst = os.path.join(dst, basename(src))
207	elif exists(dst):
208	raise DistutilsFileError, \
209	"can't move '%s': destination '%s' already exists" % \
210	(src, dst)
211
212	if not isdir(dirname(dst)):
213	raise DistutilsFileError, \
214	"can't move '%s': destination '%s' not a valid path" % \
215	(src, dst)
216
217	copy_it = 0
218	try:
219	os.rename(src, dst)
220	except os.error, (num, msg):
221	if num == errno.EXDEV:
222	copy_it = 1
223	else:
224	raise DistutilsFileError, \
225	"couldn't move '%s' to '%s': %s" % (src, dst, msg)
226
227	if copy_it:
228	copy_file(src, dst)
229	try:
230	os.unlink(src)
231	except os.error, (num, msg):
232	try:
233	os.unlink(dst)
234	except os.error:
235	pass
236	raise DistutilsFileError, \
237	("couldn't move '%s' to '%s' by copy/delete: " +
238	"delete '%s' failed: %s") % \
239	(src, dst, src, msg)
240
241	return dst
242
243	# move_file ()
244
245
246	def write_file (filename, contents):
247	"""Create a file with the specified name and write 'contents' (a
248	sequence of strings without line terminators) to it.
249	"""
250	f = open(filename, "w")
251	for line in contents:
252	f.write(line + "\n")
253	f.close()