Merge branch 'ap/remote-hg-skip-null-bookmarks'

* ap/remote-hg-skip-null-bookmarks:
  remote-hg: do not fail on invalid bookmarks

Author: gitster

contrib/remote-helpers/git-remote-hg

@@ -643,7 +643,10 @@ def do_list(parser):
             print "? refs/heads/branches/%s" % gitref(branch)
 
     for bmark in bmarks:
-        print "? refs/heads/%s" % gitref(bmark)
+        if  bmarks[bmark].hex() == '0000000000000000000000000000000000000000':
+            warn("Ignoring invalid bookmark '%s'", bmark)
+        else:
+            print "? refs/heads/%s" % gitref(bmark)
 
     for tag, node in repo.tagslist():
         if tag == 'tip':

contrib/remote-helpers/test-hg.sh

@@ -772,4 +772,77 @@ test_expect_success 'remote double failed push' '
 	)
 '
 
+test_expect_success 'clone remote with master null bookmark, then push to the bookmark' '
+	test_when_finished "rm -rf gitrepo* hgrepo*" &&
+
+	hg init hgrepo &&
+	(
+		cd hgrepo &&
+		echo a >a &&
+		hg add a &&
+		hg commit -m a &&
+		hg bookmark -r null master
+	) &&
+
+	git clone "hg::hgrepo" gitrepo &&
+	check gitrepo HEAD a &&
+	(
+		cd gitrepo &&
+		git checkout --quiet -b master &&
+		echo b >b &&
+		git add b &&
+		git commit -m b &&
+		git push origin master
+	)
+'
+
+test_expect_success 'clone remote with default null bookmark, then push to the bookmark' '
+	test_when_finished "rm -rf gitrepo* hgrepo*" &&
+
+	hg init hgrepo &&
+	(
+		cd hgrepo &&
+		echo a >a &&
+		hg add a &&
+		hg commit -m a &&
+		hg bookmark -r null -f default
+	) &&
+
+	git clone "hg::hgrepo" gitrepo &&
+	check gitrepo HEAD a &&
+	(
+		cd gitrepo &&
+		git checkout --quiet -b default &&
+		echo b >b &&
+		git add b &&
+		git commit -m b &&
+		git push origin default
+	)
+'
+
+test_expect_success 'clone remote with generic null bookmark, then push to the bookmark' '
+	test_when_finished "rm -rf gitrepo* hgrepo*" &&
+
+	hg init hgrepo &&
+	(
+		cd hgrepo &&
+		echo a >a &&
+		hg add a &&
+		hg commit -m a &&
+		hg bookmark -r null bmark
+	) &&
+
+	git clone "hg::hgrepo" gitrepo &&
+	check gitrepo HEAD a &&
+	(
+		cd gitrepo &&
+		git checkout --quiet -b bmark &&
+		git remote -v &&
+		echo b >b &&
+		git add b &&
+		git commit -m b &&
+		git push origin bmark
+	)
+'
+
 test_done