Certain remote-helpers (the ones with 'export') would try to push

Obviously this is not what the user wants.

Also, add a check for the 'dry-run' option, so remote-helpers can
implement it.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
 transport-helper.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/transport-helper.c b/transport-helper.c
index 2f5ac3f..85c951f 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -809,6 +809,11 @@ static int push_refs_with_export(struct transport 
        if (!data->refspecs)
                die("remote-helper doesn't support push; refspec needed");
+       if (flags & TRANSPORT_PUSH_DRY_RUN) {
+               if (set_helper_option(transport, "dry-run", "true") != 0)
+                       die("helper %s does not support dry-run", data->name);
+       }
        helper = get_helper(transport);
        write_constant(helper->in, "export\n");

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