Use new COPY --chown flag

Ever since moby/moby/pull/34263 became merged, there's no need to shuffle users in order to get the correct ownership on non-root users
aglorei · Feb 2, 2018 · ce52764 · ce52764
1 parent db5915d
commit ce52764
Showing 1 changed file with 3 additions and 7 deletions.
diff --git a/Dockerfile b/Dockerfile
@@ -10,17 +10,13 @@ RUN addgroup -S pokemaster && \
   -h /pokemon_battle \
   pokemaster
 
+USER pokemaster
 WORKDIR /pokemon_battle
 
-COPY Gemfile* /pokemon_battle/
-RUN chown -R pokemaster:pokemaster /pokemon_battle
-USER pokemaster
+COPY --chown=pokemaster:pokemaster Gemfile* /pokemon_battle/
 RUN bundle install --deployment
 
-USER root
-COPY . /pokemon_battle
-RUN chown -R pokemaster:pokemaster /pokemon_battle
+COPY --chown=pokemaster:pokemaster . /pokemon_battle
 
-USER pokemaster
 ENTRYPOINT ["bundle", "exec"]
 CMD ["rails", "server"]