# 
# 
# patch "mtn_cvs/cvs_sync.cc"
#  from [5739a5ac1828a6b09498ae877742273024ab9144]
#    to [cb45ce82c1fe72cde7906c3e4af89b139d7b6974]
# 
# patch "mtn_cvs/mtn_automate.cc"
#  from [e090ae7228ce2c3b752231c4595d5333529d47ab]
#    to [bcf7a37dd9f31882571737ab2a6d30e5a06258dc]
# 
# patch "mtn_cvs/mtn_automate.hh"
#  from [a9ab7c98d48c21965fdd7e492f4f8402ce83c6a5]
#    to [a35ce90bf7b002e3dc50629c3bc8c9563c40163a]
# 
============================================================
--- mtn_cvs/cvs_sync.cc	5739a5ac1828a6b09498ae877742273024ab9144
+++ mtn_cvs/cvs_sync.cc	cb45ce82c1fe72cde7906c3e4af89b139d7b6974
@@ -1130,6 +1130,38 @@ void cvs_repository::commit()
 
 void cvs_repository::commit()
 { retrieve_modules();
+  if (edges.empty())
+  { // search for a matching start of history
+    // take first head 
+    std::vector<revision_id> heads=app.heads(app.opts.branch_name());
+    N(!heads.empty(), F("branch %s has no heads") % app.opts.branch_name());
+    
+    revision_id actual=*heads.begin();
+    is_branch branch_comparer(app.opts.branch_name());
+    do
+    { std::vector<revision_id> parents=app.get_revision_parents(actual);
+      for (std::vector<revision_id>::const_iterator i=parents.begin();
+              i!=parents.end();++i)
+      { if (*i==revision_id()) break; // root revision
+        std::vector<mtn_automate::certificate> certs
+          = app.get_revision_certs(*i);
+        for (std::vector<mtn_automate::certificate>::const_iterator j=certs.begin();
+              j!=certs.end();++j)
+          if (branch_comparer(*j))
+          { actual=*i;
+            goto continue_outer;
+          }
+      }
+     continue_outer: ;
+    } while (true);
+    // start with actual
+    I(!null_id(actual));
+    bool fail=false;
+//    commit_mtn2cvs(edges.end(), actual, fail);
+//    automate::manifest_map root_manifest=app.get_manifest_of(actual);
+    
+    I(!fail);
+  }
   std::set<cvs_edge>::iterator now_iter=last_known_revision();
   while (now_iter!=edges.end())
   { const cvs_edge &now=*now_iter;
@@ -1221,7 +1253,8 @@ void cvs_sync::push(const std::string &_
             std::string const& _branch, mtncvs_state &app)
 { cvs_repository *repo=cvs_sync::prepare_sync(_repository,_module,_branch,app);
   
-  N(!repo->empty(),F("no revision certs for this repository/module\n"));
+  if (repo->empty())
+    W(F("no revision certs for this module, exporting all\n"));
   L(FL("push"));
 //  std::cerr << repo->debug() << '\n';
   repo->commit();
============================================================
--- mtn_cvs/mtn_automate.cc	e090ae7228ce2c3b752231c4595d5333529d47ab
+++ mtn_cvs/mtn_automate.cc	bcf7a37dd9f31882571737ab2a6d30e5a06258dc
@@ -155,6 +155,19 @@ std::vector<revision_id> mtn_automate::g
   return result;
 }
 
+std::vector<revision_id> mtn_automate::heads(std::string const& branch)
+{ std::vector<std::string> args(1,branch);
+  std::string heads=automate("heads",args);
+  std::vector<revision_id> result;
+  piece::piece_table lines;
+  piece::index_deltatext(heads,lines);
+  result.reserve(children.size());
+  for (piece::piece_table::const_iterator p=lines.begin();p!=lines.end();++p)
+    result.push_back(revision_id((**p).substr(0,constants::idlen)));
+  piece::reset();
+  return result;
+}
+
 static void print_cset(basic_io::printer &printer, mtn_automate::cset const& cs)
 { for (path_set::const_iterator i = cs.nodes_deleted.begin();
        i != cs.nodes_deleted.end(); ++i)
============================================================
--- mtn_cvs/mtn_automate.hh	a9ab7c98d48c21965fdd7e492f4f8402ce83c6a5
+++ mtn_cvs/mtn_automate.hh	a35ce90bf7b002e3dc50629c3bc8c9563c40163a
@@ -66,6 +66,7 @@ struct mtn_automate : mtn_pipe
   std::vector<revision_id> get_revision_children(revision_id const& rid);
   std::vector<revision_id> get_revision_parents(revision_id const& rid);
   revision_t get_revision(revision_id const& rid);
+  std::vector<revision_id> heads(std::string const& branch);
   
   std::string get_option(std::string const& name);
 };