workaround docker bug for 3.15 kernel
diff --git a/Dockerfile b/Dockerfile
index 71362d2..6ea3239 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,13 @@
FROM ubuntu:14.04.1
MAINTAINER Andy Bavier <acb@cs.princeton.edu>
+# XXX Workaround for docker bug:
+# https://github.com/docker/docker/issues/6345
+# Kernel 3.15 breaks docker, uss the line below as a workaround
+# until there is a fix
+RUN ln -s -f /bin/true /usr/bin/chfn
+# XXX End workaround
+
# Install.
RUN apt-get update
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y git