airbnb's chef-solo converge script

converge.sh

#!/bin/bash -eu

repo="/etc/chef/src"
origin=`cat /etc/chef/origin`
branch=`cat /etc/chef/branch`
role=`cat /etc/chef/role`
env=`cat /etc/chef/environment`

# create temporary files
git_clone=`mktemp -d`
json_file=`tempfile`
trap "{ rm -f '$json_file' ; rm -rf '$git_clone' ; }" EXIT

# clone the repo
GIT_SSH=/etc/chef/git_wrapper git clone --depth 1 --branch $branch -- $origin $git_clone 2>/dev/null

# use the new clone
if [ $? -ne 0 ]
then
  echo "WARNING: git clone failed; converging from old commit"
  rm -rf $git_clone
else
  rm -rf $repo && mv $git_clone $repo
fi

cd $repo

# generate the json
json="{\"role\": \"${role}\", \"env\": \"${env}\", \"branch\": \"${branch}\"}"
echo $json > $json_file

# generate the run list
runlist="role[${role}]"
if [ -f "roles/${env}.rb" ]
then
  runlist+=",role[${env}]"
fi

# do the converge
echo "****************************************"
echo "*       Beginning Converge             *"
echo "****************************************"
echo "converging to: `git log -1 --pretty=%B 2>/dev/null`"
echo "running chef-solo with:"
echo "    runlist:  ${runlist}"
echo "    json:     ${json}"
echo ""

chef-solo -o "${runlist}" -j ${json_file} "$@"

# final output
if [ $? -ne 0 ]
then
  echo "****************************************"
  echo "*    WARNING: converge failed!         *"
  echo "*  See above for error messages        *"
  echo "****************************************"
else
  echo "*       Converge Succeeded             *"
fi