MB-6606: Implement extractall function for python 2.4

ZipFile.extractall() only exists since python 2.6. For platforms with
older python version installed, we have our own implementation to
extract all zip content to a working directory.

Change-Id: I67e3cd7bbd540e62d0088444e273788ff7360623
Reviewed-on: http://review.couchbase.org/20765
Tested-by: Bin Cui <bin.cui@gmail.com>
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Reviewed-by: Farshid Ghods <farshid@couchbase.com>
Tested-by: Farshid Ghods <farshid@couchbase.com>

cbdocloader

@@ -15,6 +15,52 @@ from optparse import OptionParser
 from couchbase import client
 from couchbase.rest_client import RestConnection, RestHelper
 
+class ZipUtil:
+    def __init__(self, zipobj):
+        self.zipobj = zipobj
+
+    def extractall(self, path=None):
+        if path is None:
+            path = os.getcwd()
+        if (path[-1] in (os.path.sep, os.path.altsep)
+            and len(os.path.splitdrive(path)[1]) > 1):
+            path = path[:-1]
+
+        for member in self.zipobj.namelist():
+            if not isinstance(member, zipfile.ZipInfo):
+                member = self.zipobj.getinfo(member)
+
+            # don't include leading "/" from file name if present
+            if member.filename[0] == '/':
+                targetpath = os.path.join(path, member.filename[1:])
+            else:
+                targetpath = os.path.join(path, member.filename)
+
+            targetpath = os.path.normpath(targetpath)
+
+            # Create all parent directories if necessary.
+            upperdirs = os.path.dirname(targetpath)
+            if upperdirs and not os.path.exists(upperdirs):
+                try:
+                    os.makedirs(upperdirs)
+                except:
+                    print "Unexpected error:", sys.exc_info()[0]
+                    return upperdirs
+
+            if member.filename[-1] == '/':
+                if not os.path.isdir(targetpath):
+                    try:
+                        os.mkdir(targetpath)
+                    except:
+                        print "Fail to create directory:", targetpath
+                continue
+
+            target = file(targetpath, "wb")
+            target.write(self.zipobj.read(member.filename))
+            target.close()
+
+        return path
+
 class DocLoader:
 
     def parse_args(self):
@@ -122,9 +168,16 @@ class DocLoader:
         tmpdir = tempfile.gettempdir()
         working_dir = os.path.join(tmpdir, '_working')
         if not os.path.exists(working_dir):
-            os.makedirs(working_dir)
+            try:
+                os.makedirs(working_dir)
+            except:
+                print "Unexpected error:", sys.exc_info()[0]
+                return
+        if sys.version >= "2.6":
+            zfobj.extractall(working_dir)
+        else:
+            ZipUtil(zfobj).extractall(working_dir)
 
-        zfobj.extractall(working_dir)
         self.enumerate_and_save(working_dir)
         shutil.rmtree(working_dir)