From 64871e4cb37b2f52c0956b81bbdf1e500977fd01 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andra=CC=81s=20Boroska?= <andras.boroska@gmail.com>
Date: Mon, 31 Dec 2018 11:20:55 +0100
Subject: fix handling of default_release in config

When no release specified in cli, prevent overwriting default_release
in relx config.
---
 src/rlx_config.erl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/rlx_config.erl b/src/rlx_config.erl
index b341ae7..4160bba 100644
--- a/src/rlx_config.erl
+++ b/src/rlx_config.erl
@@ -339,6 +339,9 @@ merge_configs([{Key, Value} | CliTerms], ConfigTerms) ->
                 false ->
                     merge_configs(CliTerms, ConfigTerms++[{Key, Value}])
             end;
+        default_release when Value =:= {undefined, undefined} ->
+            %% No release specified in cli. Prevent overwriting default_release in ConfigTerms.
+            merge_configs(CliTerms, lists:keymerge(1, ConfigTerms, [{Key, Value}]));
         _ ->
             merge_configs(CliTerms, lists:reverse(lists:keystore(Key, 1, lists:reverse(ConfigTerms), {Key, Value})))
     end.
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