From 2793c0b155b6991f33529afa39247bf74f41ae91 Mon Sep 17 00:00:00 2001
From: Vaclav Petras <wenzeslaus@gmail.com>
Date: Wed, 22 Jan 2020 13:13:18 -0500
Subject: [PATCH] Add missing build dependencies

regex is a dependency but it needs to be build which requires GCC and musl libc.
This also removes the dependencies afterwards in one step to save space.
pip is upgrated before installing black.
---
 Dockerfile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 1adfe62..a6fd271 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,9 @@ FROM python:3.6-alpine
 RUN mkdir /code
 WORKDIR /code
 
-RUN pip install black
+RUN apk add --no-cache --virtual .build-deps gcc musl-dev \
+ && pip install --upgrade pip \
+ && pip install black \
+ && apk del .build-deps
 
 ENTRYPOINT ["black"]