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

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 522d791..c8c39fc 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -789,6 +789,11 @@ static int push_refs_with_export(struct transport 
*transport,
        struct string_list revlist_args = STRING_LIST_INIT_NODUP;
        struct strbuf buf = STRBUF_INIT;
 
+       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");
-- 
1.8.3.rc3.1.gf11a2b7.dirty

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