dockerfile.sh

#!/usr/bin/env bash

if [ -e .env ]; then
  source .env
fi

: ${RI_VERSION?"need to set ruby-install version RI_VERSION, see README.md"}

: ${ROOT=/root}
: ${IMAGE=ubuntu:precise}
: ${RI_PATH=ruby-install-$RI_VERSION}
: ${RI_URL=https://codeload.github.com/postmodern/ruby-install/tar.gz/v$RI_VERSION}
: ${OPTIONS="-i -t -w $ROOT -v $(pwd):$ROOT -e HOME=$ROOT -e ROOT=$ROOT"}
: ${CMD=$ROOT/install.sh}

if [ ! -d $RI_PATH ]; then
  curl $RI_URL | tar -xzvf -
fi
docker run $OPTIONS $IMAGE $CMD

gistfile1.txt

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libalgorithm-merge-perl : Depends: perl but it is not going to be installed
                           Depends: libalgorithm-diff-perl but it is not going to be installed
 libc6-dev : Depends: libc6 (= 2.15-0ubuntu10) but 2.15-0ubuntu10.5 is to be installed
 libdpkg-perl : Depends: perl but it is not going to be installed
                Depends: libtimedate-perl but it is not going to be installed
 liberror-perl : Depends: perl (>= 5.6.0-16) but it is not going to be installed
 perl-modules : Depends: perl (>= 5.14.2-1) but it is not going to be installed
                Depends: libswitch-perl but it is not going to be installed

install.sh

#!/usr/bin/env bash

if [ -e .env ]; then
  source .env
fi

: ${RUBY_VERSION?"need to set ruby version RUBY_VERSION, see README.md"}
: ${RI_VERSION?"need to set ruby-install version RI_VERSION, see README.md"}

: ${ROOT=/root}
: ${SOURCE_LIST="-o Dir::Etc::SourceList=$ROOT/sources.list"}
export DEBIAN_FRONTEND=noninteractive

apt-get $SOURCE_LIST update
apt-get $SOURCE_LIST install -y git build-essential curl libc6-dev g++ dpkg-dev perl-modules liberror-perl libdpkg-perl libalgorithm-merge-perl
apt-get clean
cd $ROOT/ruby-install-$RI_VERSION
make install
ruby-install -s $ROOT/src -i /usr/local/ ruby $RUBY_VERSION
gem update --system
gem install -f bundler rake