Merged revisions 74750 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r74750 | lars.gustaebel | 2009-09-12 12:28:15 +0200 (Sat, 12 Sep 2009) | 9 lines
Issue #6856: Add a filter keyword argument to TarFile.add().
The filter argument must be a function that takes a TarInfo
object argument, changes it and returns it again. If the
function returns None the TarInfo object will be excluded
from the archive.
The exclude argument is deprecated from now on, because it
does something similar but is not as flexible.
........
diff --git a/Doc/library/tarfile.rst b/Doc/library/tarfile.rst
index 8cf95dc..0002143 100644
--- a/Doc/library/tarfile.rst
+++ b/Doc/library/tarfile.rst
@@ -357,7 +357,7 @@
and :meth:`close`, and also supports iteration over its lines.
-.. method:: TarFile.add(name, arcname=None, recursive=True, exclude=None)
+.. method:: TarFile.add(name, arcname=None, recursive=True, exclude=None, filter=None)
Add the file *name* to the archive. *name* may be any type of file (directory,
fifo, symbolic link, etc.). If given, *arcname* specifies an alternative name
@@ -365,7 +365,18 @@
can be avoided by setting *recursive* to :const:`False`. If *exclude* is given,
it must be a function that takes one filename argument and returns a boolean
value. Depending on this value the respective file is either excluded
- (:const:`True`) or added (:const:`False`).
+ (:const:`True`) or added (:const:`False`). If *filter* is specified it must
+ be a function that takes a :class:`TarInfo` object argument and returns the
+ changed TarInfo object. If it instead returns :const:`None` the TarInfo
+ object will be excluded from the archive. See :ref:`tar-examples` for an
+ example.
+
+ .. versionchanged:: 3.2
+ Added the *filter* parameter.
+
+ .. deprecated:: 3.2
+ The *exclude* parameter is deprecated, please use the *filter* parameter
+ instead.
.. method:: TarFile.addfile(tarinfo, fileobj=None)
@@ -598,6 +609,18 @@
print("something else.")
tar.close()
+How to create an archive and reset the user information using the *filter*
+parameter in :meth:`TarFile.add`::
+
+ import tarfile
+ def reset(tarinfo):
+ tarinfo.uid = tarinfo.gid = 0
+ tarinfo.uname = tarinfo.gname = "root"
+ return tarinfo
+ tar = tarfile.open("sample.tar.gz", "w:gz")
+ tar.add("foo", filter=reset)
+ tar.close()
+
.. _tar-formats:
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index ebaffd9..7b7c25e 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1898,13 +1898,16 @@
print("link to", tarinfo.linkname, end=' ')
print()
- def add(self, name, arcname=None, recursive=True, exclude=None):
+ def add(self, name, arcname=None, recursive=True, exclude=None, filter=None):
"""Add the file `name' to the archive. `name' may be any type of file
(directory, fifo, symbolic link, etc.). If given, `arcname'
specifies an alternative name for the file in the archive.
Directories are added recursively by default. This can be avoided by
setting `recursive' to False. `exclude' is a function that should
- return True for each filename to be excluded.
+ return True for each filename to be excluded. `filter' is a function
+ that expects a TarInfo object argument and returns the changed
+ TarInfo object, if it returns None the TarInfo object will be
+ excluded from the archive.
"""
self._check("aw")
@@ -1912,9 +1915,13 @@
arcname = name
# Exclude pathnames.
- if exclude is not None and exclude(name):
- self._dbg(2, "tarfile: Excluded %r" % name)
- return
+ if exclude is not None:
+ import warnings
+ warnings.warn("use the filter argument instead",
+ DeprecationWarning, 2)
+ if exclude(name):
+ self._dbg(2, "tarfile: Excluded %r" % name)
+ return
# Skip if somebody tries to archive the archive...
if self.name is not None and os.path.abspath(name) == self.name:
@@ -1930,6 +1937,13 @@
self._dbg(1, "tarfile: Unsupported type %r" % name)
return
+ # Change or exclude the TarInfo object.
+ if filter is not None:
+ tarinfo = filter(tarinfo)
+ if tarinfo is None:
+ self._dbg(2, "tarfile: Excluded %r" % name)
+ return
+
# Append the tar header and data to the archive.
if tarinfo.isreg():
f = bltn_open(name, "rb")
@@ -1940,7 +1954,8 @@
self.addfile(tarinfo)
if recursive:
for f in os.listdir(name):
- self.add(os.path.join(name, f), os.path.join(arcname, f), recursive, exclude)
+ self.add(os.path.join(name, f), os.path.join(arcname, f),
+ recursive, exclude, filter)
else:
self.addfile(tarinfo)
diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py
index 83f4a8c..e916879 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -659,6 +659,34 @@
finally:
shutil.rmtree(tempdir)
+ def test_filter(self):
+ tempdir = os.path.join(TEMPDIR, "filter")
+ os.mkdir(tempdir)
+ try:
+ for name in ("foo", "bar", "baz"):
+ name = os.path.join(tempdir, name)
+ open(name, "wb").close()
+
+ def filter(tarinfo):
+ if os.path.basename(tarinfo.name) == "bar":
+ return
+ tarinfo.uid = 123
+ tarinfo.uname = "foo"
+ return tarinfo
+
+ tar = tarfile.open(tmpname, self.mode, encoding="iso8859-1")
+ tar.add(tempdir, arcname="empty_dir", filter=filter)
+ tar.close()
+
+ tar = tarfile.open(tmpname, "r")
+ for tarinfo in tar:
+ self.assertEqual(tarinfo.uid, 123)
+ self.assertEqual(tarinfo.uname, "foo")
+ self.assertEqual(len(tar.getmembers()), 3)
+ tar.close()
+ finally:
+ shutil.rmtree(tempdir)
+
# Guarantee that stored pathnames are not modified. Don't
# remove ./ or ../ or double slashes. Still make absolute
# pathnames relative.
diff --git a/Misc/NEWS b/Misc/NEWS
index fe856ae..e1733e0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -70,6 +70,8 @@
Library
-------
+- Issue #6856: Add a filter keyword argument to TarFile.add().
+
- Issue #6888: pdb's alias command was broken when no arguments were given.
- Issue #6857: Default format() alignment should be '>' for Decimal