share: backout fd903f89e42b, except the test

Locating the share source when no default path is available is now handled in
subrepo._abssource(), so unconditionally setting a default path (and the
associated problems) can be avoided.

The test change reflects the fact that a default path is no longer set on the
resulting share.

mercurial/hg.py

@@ -171,14 +171,11 b' def share(ui, source, dest=None, update='
     r = repository(ui, root)
 
     default = srcrepo.ui.config('paths', 'default')
-    if not default:
-        # set default to source for being able to clone subrepos
-        default = os.path.abspath(util.urllocalpath(origsource))
-    fp = r.opener("hgrc", "w", text=True)
-    fp.write("[paths]\n")
-    fp.write("default = %s\n" % default)
-    fp.close()
-    r.ui.setconfig('paths', 'default', default)
+    if default:
+        fp = r.opener("hgrc", "w", text=True)
+        fp.write("[paths]\n")
+        fp.write("default = %s\n" % default)
+        fp.close()
 
     if update:
         r.ui.status(_("updating working directory\n"))

tests/test-subrepo.t

@@ -726,10 +726,8 b' Check that share works with subrepo'
   $ test -f ../shared/subrepo-1/.hg/sharedpath
   [1]
   $ hg -R ../shared in
-  comparing with $TESTTMP/subrepo-status (glob)
-  searching for changes
-  no changes found
-  [1]
+  abort: repository default not found!
+  [255]
   $ hg -R ../shared/subrepo-2 showconfig paths
   paths.default=$TESTTMP/subrepo-status/subrepo-2
   $ hg -R ../shared/subrepo-1 sum --remote