/usr/lib/python2.7/dist-packages/charmtools/templates/chef/files/hooks/bootstrap is in charm-tools 2.1.2-0ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/bash
set -e
apt-get update
sudo apt-get install -y ruby1.9.1 ruby1.9.1-dev \
rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 \
build-essential libopenssl-ruby1.9.1 libssl-dev zlib1g-dev
gem install bundler --no-rdoc --no-ri
cd "$(dirname $0)../cookbooks" && bundle install
mkdir -p /etc/chef
cat > /etc/chef/solo.rb <<EOF
cookbook_path '$CHARM_DIR/cookbooks'
EOF
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