WIP fix rebootstrap for buildout rebase

setup.py

 from setuptools import setup, find_packages
-version = '4.5+xavier001'
+version = '4.5.dev1'
 name = "slapos.rebootstrap"
 
 long_description = open("README.rst").read() + '\n\n'

slapos/rebootstrap/bootstrap.py

@@ -10,7 +10,7 @@ class FakeSysExecutable(object):
 
 def get_distributions():
   from pkg_resources import get_distribution
-  distributions = ['setuptools', 'zc.buildout']
+  distributions = ['setuptools', 'zc.buildout', 'wheel', 'pip']
   try:
     import slapos.libnetworkcache
   except ImportError:
@@ -36,15 +36,18 @@ def setup_script(path, python=sys.executable):
     easy_install.sys = sys
 
 def main():
-  import shutil, subprocess, tempfile, zipfile
+  import shutil, subprocess, tempfile, zipfile, tarfile
   eggs_dir = sys.argv[2]
   cache = sys.argv[3]
-  # Install setuptools.
-  src = os.path.join(cache, sys.argv[4].replace('==', '-') + '.zip')
+  base = os.path.join(cache, sys.argv[4].replace('==', '-'))
   tmp = tempfile.mkdtemp()
   try:
-    with zipfile.ZipFile(src) as zip_file:
-      zip_file.extractall(tmp)
+    try:
+      with zipfile.ZipFile(base + '.zip') as zip_file:
+        zip_file.extractall(tmp)
+    except (IOError, OSError):
+      with tarfile.open(base + '.tar.gz') as tar_file:
+        tar_file.extractall(tmp)
     src, = os.listdir(tmp)
     subprocess.check_call((sys.executable, 'setup.py', '-q', 'bdist_egg',
                           '--dist-dir', tmp), cwd=os.path.join(tmp, src))