Feat/start using docker entrypoint script (#27)

* Feat/start-using-docker-entrypoint-script

according to https://github.com/docker-library/official-images\#consistency

* bump version & add changelog entry

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com),
 and this project adheres to [Semantic Versioning](https://semver.org).
 
+## [2.1.2] - 2020-06-25
+### Added
+ - Added entrypoint script to meet requirements of official docker image consistency
+
 ## [2.1.1] - 2020-06-23
 ### Fixed
 - Fixed setting the labels twice when releasing 2.1.0

Dockerfile

@@ -12,6 +12,8 @@ USER root
 RUN apt-get update && apt-get install -y --no-install-recommends python3 python-pip python-setuptools && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder /rep /rep
+COPY docker-entrypoint.sh /docker-entrypoint.sh
 WORKDIR /rep
 RUN pip3 install --no-index --find-links=/rep/wheels .
-ENTRYPOINT ["gordian"]
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["gordian"]

docker-entrypoint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+set -e
+
+# this if will check if the first argument is a flag
+if [ "$#" -eq 0 ] || [ "${1#-}" != "$1" ]; then
+    set -- gordian "$@"
+fi
+
+# check for the expected command
+if [ "$1" = 'gordian' ]; then
+    exec gordian "$@"
+fi
+
+# else default to run whatever the user wanted like "bash" or "sh"
+exec "$@"

setup.py

@@ -3,7 +3,7 @@
 setup_reqs = ['pytest', 'pytest-cov', 'pytest-runner', 'flake8']
 setuptools.setup(
     name="gordian",
-    version="2.1.1",
+    version="2.1.2",
     author="Intuit",
     author_email="[email protected]",
     description="A tool to search and replace files in a Git repo",