# HG changeset patch
# User Gregory Szorc <gregory.szorc@gmail.com>
# Date 2016-05-05 06:38:34
# Node ID c8fbfb9163ce786d0feee162365bd5353d6dbe20
# Parent  fe7ebef8796a8a7e1668ed15ddcb8c49c1999f05

sslutil: move code examining _canloaddefaultcerts out of _defaultcacerts

Before, the return of _defaultcacerts() was 1 of 3 types. This was
difficult to read. Make it return a path or None.

We had to update hghave.py in the same patch because it was also
looking at this internal function. I wasted dozens of minutes
trying to figure out why tests were failing until I found the
code in hghave.py...

diff --git a/mercurial/sslutil.py b/mercurial/sslutil.py
--- a/mercurial/sslutil.py
+++ b/mercurial/sslutil.py
@@ -222,14 +222,13 @@ def _plainapplepython():
             exe.startswith('/system/library/frameworks/python.framework/'))
 
 def _defaultcacerts():
-    """return path to CA certificates; None for system's store; ! to disable"""
+    """return path to default CA certificates or None."""
     if _plainapplepython():
         dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
         if os.path.exists(dummycert):
             return dummycert
-    if _canloaddefaultcerts:
-        return None
-    return '!'
+
+    return None
 
 def sslkwargs(ui, host):
     """Determine arguments to pass to wrapsocket().
@@ -262,8 +261,12 @@ def sslkwargs(ui, host):
 
     # No CAs in config. See if we can load defaults.
     cacerts = _defaultcacerts()
-    if cacerts and cacerts != '!':
+    if cacerts:
         ui.debug('using %s to enable OS X system CA\n' % cacerts)
+    else:
+        if not _canloaddefaultcerts:
+            cacerts = '!'
+
     ui.setconfig('web', 'cacerts', cacerts, 'defaultcacerts')
 
     if cacerts != '!':
diff --git a/tests/hghave.py b/tests/hghave.py
--- a/tests/hghave.py
+++ b/tests/hghave.py
@@ -416,7 +416,7 @@ def has_sslcontext():
 @check("defaultcacerts", "can verify SSL certs by system's CA certs store")
 def has_defaultcacerts():
     from mercurial import sslutil
-    return sslutil._defaultcacerts() != '!'
+    return sslutil._defaultcacerts() or sslutil._canloaddefaultcerts
 
 @check("windows", "Windows")
 def has_windows():