For the modes that need it. In the future we should probably error out,
instead of providing half-assed support.

The reason we want to do this is because if it's not present, the remote
helper might be updating refs/heads/*, or refs/remotes/origin/*,
directly, and in the process fetch will get confused trying to update
refs that are already updated, or older than what they should be. We
shouldn't be messing with the rest of git.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 t/t5801-remote-helpers.sh | 6 ++++--
 transport-helper.c        | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/t/t5801-remote-helpers.sh b/t/t5801-remote-helpers.sh
index 3eeb309..1bb7529 100755
--- a/t/t5801-remote-helpers.sh
+++ b/t/t5801-remote-helpers.sh
@@ -100,14 +100,16 @@ test_expect_failure 'push new branch with old:new 
refspec' '
 
 test_expect_success 'cloning without refspec' '
        GIT_REMOTE_TESTGIT_REFSPEC="" \
-       git clone "testgit::${PWD}/server" local2 &&
+       git clone "testgit::${PWD}/server" local2 2> error &&
+       grep "This remote helper should implement refspec capability" error &&
        compare_refs local2 HEAD server HEAD
 '
 
 test_expect_success 'pulling without refspecs' '
        (cd local2 &&
        git reset --hard &&
-       GIT_REMOTE_TESTGIT_REFSPEC="" git pull) &&
+       GIT_REMOTE_TESTGIT_REFSPEC="" git pull 2> ../error) &&
+       grep "This remote helper should implement refspec capability" error &&
        compare_refs local2 HEAD server HEAD
 '
 
diff --git a/transport-helper.c b/transport-helper.c
index 4d98567..573eaf7 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -215,6 +215,8 @@ static struct child_process *get_helper(struct transport 
*transport)
                        free((char *)refspecs[i]);
                }
                free(refspecs);
+       } else if (data->import || data->bidi_import || data->export) {
+               warning("This remote helper should implement refspec 
capability.");
        }
        strbuf_release(&buf);
        if (debug)
-- 
1.8.2.1.679.g509521a

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