Index: docker-compose.shell.yml
===================================================================
--- /dev/null
+++ docker-compose.shell.yml
@@ -0,0 +1,14 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This compose file is meant to be used via 'invoke shell'.
+#
+# Runs a development shell with 'arc' installed.
+
+version: '2'
+services:
+  shell:
+    build:
+      context: ./docker/shell
+      dockerfile: ./Dockerfile
Index: docker/shell/Dockerfile
===================================================================
--- /dev/null
+++ docker/shell/Dockerfile
@@ -0,0 +1,29 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+FROM alpine:3.3
+
+# Build/install dependencies
+RUN apk --no-cache add ca-certificates curl bash php-cli php-curl php-json git
+
+# add a non-privileged user
+RUN addgroup -g 1000 phab && adduser -D -u 1000 -G phab -s /bin/bash phab
+
+WORKDIR /home/phab
+
+# Install Arcanist
+RUN mkdir -p phabricator \
+    && cd phabricator \
+    && git clone https://github.com/phacility/libphutil.git \
+    && git clone https://github.com/phacility/arcanist.git
+
+COPY arcrc .arcrc
+COPY gitconfig .gitconfig
+RUN chmod 600 .arcrc \
+    && echo "export PATH=/home/phab/phabricator/arcanist/bin:\$PATH" >> .bash_profile \
+    && echo "export EDITOR=vi" >> .bash_profile \
+    && chown -R phab:phab /home/phab
+
+USER phab
+CMD ["/bin/bash"]
Index: docker/shell/arcrc
===================================================================
--- /dev/null
+++ docker/shell/arcrc
@@ -0,0 +1,10 @@
+{
+  "config": {
+    "phabricator.uri": "http://phabricator.test"
+  },
+  "hosts": {
+    "http://phabricator.test/api/": {
+      "token": "XXX"
+    }
+  }
+}
Index: docker/shell/gitconfig
===================================================================
--- /dev/null
+++ docker/shell/gitconfig
@@ -0,0 +1,3 @@
+[user]
+	email = you@example.com
+	name = Your Name
Index: tasks.py
===================================================================
--- /dev/null
+++ tasks.py
@@ -0,0 +1,16 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from invoke import task
+from accepted-older
+
+@task
+def shell(c):
+    """Run a shell with 'arc' installed."""
+    c.run('docker-compose'
+          ' -f docker-compose.yml'
+          ' -f docker-compose.shell.yml'
+          ' run shell',
+        pty=True
+    )