outgoing: pay attention to `default:pushurl` for bookmarks and subrepos

outgoing: pay attention to `default:pushurl` for bookmarks and subrepos

The problem here was that `default:pushurl` and `default` get translated to a
single entry in `ui.paths` named 'default', with an attribute for 'pushloc',
'loc', and 'rawloc'.  ui.expandpath() then always takes the `rawloc` attribute.
Maybe the ui.expandpath() API is busted and should be removed?  Or maybe
getpath() should return a copy that adds an attribute reflecting the URL of the
path chosen?

I thought that I could remove the code in hg._outgoing() and pass the location
resolved in commands.py as `dest`, but unfortunately that code is needed there
to resolve #branch type URLs.  Maybe that should be pulled up to commands.py,
because I can't see any reasonable behavior for a subrepo path that's
constructed out of that type of URL.

The push command already resolves this early, so that works properly.  But it
looks like bundle, histedit, largefiles, patchbomb, and summary use a similar
pattern, so they are likely similarly affected.

--- a/mercurial/commands.py	Sat Apr 21 17:27:57 2018 +0200
+++ b/mercurial/commands.py	Mon May 28 01:36:34 2018 -0400
@@ -3711,6 +3711,13 @@
 
     Returns 0 if there are outgoing changes, 1 otherwise.
     """
+    # hg._outgoing() needs to re-resolve the path in order to handle #branch
+    # style URLs, so don't overwrite dest.
+    path = ui.paths.getpath(dest, default=('default-push', 'default'))
+    if not path:
+        raise error.Abort(_('default repository not configured!'),
+                          hint=_("see 'hg help config.paths'"))
+
     opts = pycompat.byteskwargs(opts)
     if opts.get('graph'):
         logcmdutil.checkunsupportedgraphflags([], opts)
@@ -3728,7 +3735,7 @@
         return 0
 
     if opts.get('bookmarks'):
-        dest = ui.expandpath(dest or 'default-push', dest or 'default')
+        dest = path.pushloc or path.loc
         dest, branches = hg.parseurl(dest, opts.get('branch'))
         other = hg.peer(repo, opts, dest)
         if 'bookmarks' not in other.listkeys('namespaces'):
@@ -3738,7 +3745,7 @@
         ui.pager('outgoing')
         return bookmarks.outgoing(ui, repo, other)
 
-    repo._subtoppath = ui.expandpath(dest or 'default-push', dest or 'default')
+    repo._subtoppath = path.pushloc or path.loc
     try:
         return hg.outgoing(ui, repo, dest, opts)
     finally:

--- a/tests/test-ssh.t	Sat Apr 21 17:27:57 2018 +0200
+++ b/tests/test-ssh.t	Mon May 28 01:36:34 2018 -0400
@@ -230,7 +230,7 @@
   namespaces	
   phases	
   $ hg book foo -r 0
-  $ hg out -B
+  $ hg out -B --config paths.default=bogus://invalid --config paths.default:pushurl=`hg paths default`
   comparing with ssh://user@dummy/remote
   searching for changed bookmarks
      foo                       1160648e36ce

--- a/tests/test-subrepo-relative-path.t	Sat Apr 21 17:27:57 2018 +0200
+++ b/tests/test-subrepo-relative-path.t	Mon May 28 01:36:34 2018 -0400
@@ -56,6 +56,30 @@
   new changesets 863c1745b441
   3 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
+Ensure that subrepos pay attention to default:pushurl
+
+  $ cat > cloned/.hg/hgrc << EOF
+  > [paths]
+  > default:pushurl = http://localhost:$HGPORT/main
+  > EOF
+
+  $ hg -R cloned out -S --config paths.default=bogus://invalid
+  comparing with http://localhost:$HGPORT/main
+  searching for changes
+  no changes found
+  comparing with http://localhost:$HGPORT/sub
+  searching for changes
+  no changes found
+  [1]
+
+  $ hg -R cloned push --config paths.default=bogus://invalid
+  pushing to http://localhost:$HGPORT/main
+  no changes made to subrepo sub since last push to http://localhost:$HGPORT/sub
+  searching for changes
+  no changes found
+  abort: HTTP Error 403: ssl required
+  [255]
+
 Checking cloned repo ids
 
   $ hg id -R cloned