From 21121e64b4245e51b85b9d2bc9b29acb86ae79eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lars=20Gust=C3=A4bel?= <lars@gustaebel.de>
Date: Sat, 12 Sep 2009 10:28:15 +0000
Subject: [PATCH] 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.
---
 Doc/library/tarfile.rst  | 27 +++++++++++++++++++++++++--
 Lib/tarfile.py           | 27 +++++++++++++++++++++------
 Lib/test/test_tarfile.py | 28 ++++++++++++++++++++++++++++
 Misc/NEWS                |  2 ++
 4 files changed, 76 insertions(+), 8 deletions(-)

diff --git a/Doc/library/tarfile.rst b/Doc/library/tarfile.rst
index 29968396e01..fa6cca7cc27 100644
--- a/Doc/library/tarfile.rst
+++ b/Doc/library/tarfile.rst
@@ -389,7 +389,7 @@ object, see :ref:`tarinfo-objects` for details.
       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
@@ -397,11 +397,22 @@ object, see :ref:`tarinfo-objects` for details.
    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:: 2.6
       Added the *exclude* parameter.
 
+   .. versionchanged:: 2.7
+      Added the *filter* parameter.
+
+   .. deprecated:: 2.7
+      The *exclude* parameter is deprecated, please use the *filter* parameter
+      instead.
+
 
 .. method:: TarFile.addfile(tarinfo, fileobj=None)
 
@@ -653,6 +664,18 @@ How to read a gzip compressed tar archive and display some member information::
            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 54a26062ed9..a87fe225d17 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1918,13 +1918,16 @@ class TarFile(object):
                     print "link to", tarinfo.linkname,
             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")
 
@@ -1932,9 +1935,13 @@ class TarFile(object):
             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:
@@ -1950,6 +1957,13 @@ class TarFile(object):
             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")
@@ -1960,7 +1974,8 @@ class TarFile(object):
             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 8c9b0ec3dd7..1240e1a97fc 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -660,6 +660,34 @@ class WriteTest(WriteTestBase):
         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 4c382181483..734bddf001b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -366,6 +366,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #6856: Add a filter keyword argument to TarFile.add().
+
 - Issue #6163: Fixed HP-UX runtime library dir options in
   distutils.unixcompiler. Initial patch by Sridhar Ratnakumar and
   Michael Haubenwallner.