Merge branch 't2' into t

* t2:
  ~ MOSTLY OK
  .
  .
  .
  .
  .
  .

.nxdtest

 # setup to run tests on Nexedi testing infrastructure.
 # https://stack.nexedi.com/test_status
 
-storv    = ['fs', 'zeo', 'neo'] # storage backends to test against
-#  XXX ci
+storv = ['fs', 'zeo', 'neo'] # storage backends to test against
 
 # some bugs are only likely to trigger when there is only 1 or 2 main OS thread(s) in wcfs
 # GOMAXPROCS='' means use `nproc`

lib/utils.c

@@ -182,7 +182,7 @@ void dump_traceback(int fd)
     void *pcv[256];
     int n;
 
-    /* XXX better use https://github.com/ianlancetaylor/libbacktrace
+    /* TODO better use https://github.com/ianlancetaylor/libbacktrace
      * because backtrace_symbols often does not provide symbolic information */
     n = backtrace(pcv, 256);
     backtrace_symbols_fd(pcv, n, fd);

setup.py

@@ -28,9 +28,10 @@ from subprocess import Popen, PIPE
 
 import os
 import sys
+from errno import EEXIST
 
 
-# tell cython to resolve `cimport wendelin.*` modules hierarcy starting at top-level.
+# tell cython to resolve `cimport wendelin.*` modules hierarchy starting at top-level.
 # see wendelin.py for details.
 from Cython.Compiler.Main import Context as CyContext
 cy_search_inc_dirs = CyContext.search_include_directories
@@ -72,7 +73,7 @@ def _with_defaults(what, *argv, **kw):
     else:
         ccdefault.append('-std=gnu++11')    # not c++11 since we use typeof
 
-    # DSOs are not yet annoated for visibility
+    # DSOs are not yet annotated for visibility
     # XXX pyext besides _bigfile.so also cannot do this because PyMODINIT_FUNC
     # does not include export in it. TODO reenable for _bigfile.so
     """
@@ -86,8 +87,8 @@ def _with_defaults(what, *argv, **kw):
 
     lddefault = []
     # python extensions cannot be built with -Wl,--no-undefined: at runtime
-    # they links with either python (without libpython) or libpython. linking
-    # with both libpython and python would be wrong
+    # they link with either python (without libpython) or libpython. linking
+    # with both libpython and python would be wrong.
     if what == _DSO:
         lddefault.append('-Wl,--no-undefined')  # check DSO for undefined symbols at link time
 
@@ -95,14 +96,13 @@ def _with_defaults(what, *argv, **kw):
     _[0:0] = lddefault
     kw['extra_link_args'] = _
 
-
     return what(*argv, **kw)
 
+
 def PyGoExt(*argv, **kw):   return _with_defaults(_PyGoExt, *argv, **kw)
 def DSO(*argv, **kw):       return _with_defaults(_DSO, *argv, **kw)
 
 
-
 # build_py that
 # - prevents in-tree wendelin.py & setup.py to be installed
 # - synthesizes wendelin/__init__.py on install
@@ -188,8 +188,13 @@ class build_ext(_build_ext):
 
         # copy wcfs/wcfs built from wcfs.go by make into build/lib.linux-x86_64-2.7/...
         # so that py packaging tools see built wcfs.go as part of wendelin/wcfs package.
-        copy_file('wcfs/wcfs', os.path.join(self.build_lib, 'wendelin/wcfs/wcfs'),
-            verbose=self.verbose, dry_run=self.dry_run)
+        dst = os.path.join(self.build_lib, 'wendelin/wcfs')
+        try:
+            os.makedirs(dst)
+        except OSError as e:
+            if e.errno != EEXIST:
+                raise
+        copy_file('wcfs/wcfs', dst, verbose=self.verbose, dry_run=self.dry_run)