Add Docker support.

.dockerignore

@@ -0,0 +1 @@
+.git*

Dockerfile

@@ -0,0 +1,13 @@
+FROM python:3-alpine
+MAINTAINER Tecnativa <info@tecnativa.com>
+ENTRYPOINT ["/usr/src/app/entrypoint.sh"]
+ENV GIT_AUTHOR_NAME=git-aggregator \
+    EMAIL=https://hub.docker.com/r/tecnativa/git-aggregator
+# HACK Install git >= 2.11, to have --shallow-since
+# TODO Remove HACK when python:alpine is alpine >= v3.5
+RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/v3.5/main git
+COPY . /usr/src/app
+RUN pip install --no-cache-dir --editable /usr/src/app
+RUN python -m compileall /usr/src/app/
+VOLUME /repos
+WORKDIR /repos

README.rst

@@ -117,6 +117,16 @@ Only aggregate a specific repository using `fnmatch`_:
 
 .. _fnmatch: https://docs.python.org/2/library/fnmatch.html
 
+Dockerized version
+------------------
+
+You can use ``git-aggregator`` from CLI without installing anything but Docker:
+
+.. code-block:: bash
+
+    $ docker run -it --rm -v $(pwd):/repos tecnativa/git-aggregator -c repos.yaml
+
+
 Credits
 =======
 

entrypoint.sh

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+#!/bin/sh
+
+# Default to the gitaggregate command if we get an option as first argument
+if [ "${1:0:1}" == - ]; then
+    cmd="gitaggregate $@"
+else
+    cmd="$@"
+fi
+
+# Add SETUID & SETGUID to binaries to make them run with the same user as
+# `/repos`'s owner. In case you mount `/repos` from your host computer. This is
+# useful because otherwise all files and folders would be owned by `root`.
+uid=$(stat -c %u /repos)
+if [ $uid -ne $(id -u root) ]; then
+    gid=$(stat -c %g /repos)
+    addgroup -g $gid threpwood
+    adduser -G threpwood -u $uid guybrush -DH -s /bin/sh
+
+    exec su guybrush -c "$cmd"
+else
+    exec "$cmd"
+fi