1 files changed, 200 insertions, 0 deletions
diff --git a/Lib/setuptools/archive_util.py b/Lib/setuptools/archive_util.py
new file mode 100755
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+++ b/Lib/setuptools/archive_util.py
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+"""Utilities for extracting common archive formats"""
+
+
+__all__ = [
+    "unpack_archive", "unpack_zipfile", "unpack_tarfile", "default_filter",
+    "UnrecognizedFormat", "extraction_drivers", "unpack_directory",
+]
+
+import zipfile, tarfile, os, shutil
+from pkg_resources import ensure_directory
+from distutils.errors import DistutilsError
+
+class UnrecognizedFormat(DistutilsError):
+    """Couldn't recognize the archive type"""
+
+def default_filter(src,dst):
+    """The default progress/filter callback; returns True for all files"""
+    return dst
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+def unpack_archive(filename, extract_dir, progress_filter=default_filter,
+    drivers=None
+):
+    """Unpack `filename` to `extract_dir`, or raise ``UnrecognizedFormat``
+
+    `progress_filter` is a function taking two arguments: a source path
+    internal to the archive ('/'-separated), and a filesystem path where it
+    will be extracted.  The callback must return the desired extract path
+    (which may be the same as the one passed in), or else ``None`` to skip
+    that file or directory.  The callback can thus be used to report on the
+    progress of the extraction, as well as to filter the items extracted or
+    alter their extraction paths.
+
+    `drivers`, if supplied, must be a non-empty sequence of functions with the
+    same signature as this function (minus the `drivers` argument), that raise
+    ``UnrecognizedFormat`` if they do not support extracting the designated
+    archive type.  The `drivers` are tried in sequence until one is found that
+    does not raise an error, or until all are exhausted (in which case
+    ``UnrecognizedFormat`` is raised).  If you do not supply a sequence of
+    drivers, the module's ``extraction_drivers`` constant will be used, which
+    means that ``unpack_zipfile`` and ``unpack_tarfile`` will be tried, in that
+    order.
+    """
+    for driver in drivers or extraction_drivers:
+        try:
+            driver(filename, extract_dir, progress_filter)
+        except UnrecognizedFormat:
+            continue
+        else:
+            return
+    else:
+        raise UnrecognizedFormat(
+            "Not a recognized archive type: %s" % filename
+        )
+
+
+
+
+
+
+
+def unpack_directory(filename, extract_dir, progress_filter=default_filter):
+    """"Unpack" a directory, using the same interface as for archives
+
+    Raises ``UnrecognizedFormat`` if `filename` is not a directory
+    """
+    if not os.path.isdir(filename):
+        raise UnrecognizedFormat("%s is not a directory" % (filename,))
+
+    paths = {filename:('',extract_dir)}
+    for base, dirs, files in os.walk(filename):
+        src,dst = paths[base]
+        for d in dirs:
+            paths[os.path.join(base,d)] = src+d+'/', os.path.join(dst,d)
+        for f in files:
+            name = src+f
+            target = os.path.join(dst,f)
+            target = progress_filter(src+f, target)
+            if not target:
+                continue    # skip non-files
+            ensure_directory(target)
+            f = os.path.join(base,f)
+            shutil.copyfile(f, target)
+            shutil.copystat(f, target)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
+    """Unpack zip `filename` to `extract_dir`
+
+    Raises ``UnrecognizedFormat`` if `filename` is not a zipfile (as determined
+    by ``zipfile.is_zipfile()``).  See ``unpack_archive()`` for an explanation
+    of the `progress_filter` argument.
+    """
+
+    if not zipfile.is_zipfile(filename):
+        raise UnrecognizedFormat("%s is not a zip file" % (filename,))
+
+    z = zipfile.ZipFile(filename)
+    try:
+        for info in z.infolist():
+            name = info.filename
+
+            # don't extract absolute paths or ones with .. in them
+            if name.startswith('/') or '..' in name:
+                continue
+
+            target = os.path.join(extract_dir, *name.split('/'))
+            target = progress_filter(name, target)
+            if not target:
+                continue
+            if name.endswith('/'):
+                # directory
+                ensure_directory(target)
+            else:
+                # file
+                ensure_directory(target)
+                data = z.read(info.filename)
+                f = open(target,'wb')
+                try:
+                    f.write(data)
+                finally:
+                    f.close()
+                    del data
+    finally:
+        z.close()
+
+
+def unpack_tarfile(filename, extract_dir, progress_filter=default_filter):
+    """Unpack tar/tar.gz/tar.bz2 `filename` to `extract_dir`
+
+    Raises ``UnrecognizedFormat`` if `filename` is not a tarfile (as determined
+    by ``tarfile.open()``).  See ``unpack_archive()`` for an explanation
+    of the `progress_filter` argument.
+    """
+
+    try:
+        tarobj = tarfile.open(filename)
+    except tarfile.TarError:
+        raise UnrecognizedFormat(
+            "%s is not a compressed or uncompressed tar file" % (filename,)
+        )
+
+    try:
+        tarobj.chown = lambda *args: None   # don't do any chowning!
+        for member in tarobj:
+            if member.isfile() or member.isdir():
+                name = member.name
+                # don't extract absolute paths or ones with .. in them
+                if not name.startswith('/') and '..' not in name:
+                    dst = os.path.join(extract_dir, *name.split('/'))
+                    dst = progress_filter(name, dst)
+                    if dst:
+                        if dst.endswith(os.sep):
+                            dst = dst[:-1]
+                        tarobj._extract_member(member,dst)  # XXX Ugh
+        return True
+    finally:
+        tarobj.close()
+
+
+
+
+extraction_drivers = unpack_directory, unpack_zipfile, unpack_tarfile