Helper script for easy migration from Ksonnet to Qbec

ks2qbec

#!/bin/bash

function parse_yaml {
   local prefix=$2
   local s='[[:space:]]*' w='[a-zA-Z0-9_]*' fs=$(echo @|tr @ '\034')
   sed -ne "s|^\($s\):|\1|" \
        -e "s|^\($s\)\($w\)$s:$s[\"']\(.*\)[\"']$s\$|\1$fs\2$fs\3|p" \
        -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p"  $1 |
   awk -F$fs '{
      indent = length($1)/2;
      vname[indent] = $2;
      for (i in vname) {if (i > indent) {delete vname[i]}}
      if (length($3) > 0) {
         vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
         printf("%s%s%s=\"%s\"\n", "'$prefix'",vn, $2, $3);
      }
   }'
}

eval $(parse_yaml app.yaml)

envs=$(compgen -v | sed -n 's/^environments_\(.*\)_path/\1/p')

if [ "$1" = "rm" ]; then
  (
    set -x
    rm -f "./app.yaml"
    rm -fr "./lib/"
  )
  for env in $envs; do
    (
      set -x
      rm -fr "./environments/$env/"
    )
  done
  exit 0
fi

cat > qbec.yaml <<EOT
apiVersion: qbec.io/v1alpha1
kind: App
metadata:
  name: $name
spec:
  environments:
EOT

for env in $envs; do
cat >> qbec.yaml <<EOT
    $env:
      defaultNamespace: $(eval echo "\$environments_${env}_destination_namespace")
      server: $(eval echo "\$environments_${env}_destination_server")
EOT
done

cat >> qbec.yaml <<EOT
  vars: {}
EOT


cat > params.libsonnet <<EOT
// this file returns the params for the current qbec environment
// you need to add an entry here every time you add a new environment.

local env = std.extVar('qbec.io/env');
local paramsMap = {
  _: import './environments/base.libsonnet',
EOT

for env in $envs; do
cat >> params.libsonnet <<EOT
  $env: import './environments/$env.libsonnet',
EOT
done

cat >> params.libsonnet <<EOT
};

if std.objectHas(paramsMap, env) then paramsMap[env] else error 'environment ' + env + ' not defined in ' + std.thisFile
EOT


for env in $envs; do
cat > environments/$env.libsonnet <<EOT
//
// ======= globals.libsonnet =======
//
EOT
sed 's|^|// |' environments/$env/globals.libsonnet >> environments/$env.libsonnet

cat >> environments/$env.libsonnet <<EOT


//
// ======== params.libsonnet =======
//
EOT

sed 's|^|// |' environments/$env/params.libsonnet >> environments/$env.libsonnet

cat >> environments/$env.libsonnet <<EOT
// =================================

// this file has the param overrides for the default environment
local base = import './base.libsonnet';

base {
  components +: {
  }
}
EOT

done


for component in $(ls -1 components/*.jsonnet); do
sed -i "s|local params = std.extVar('__ksonnet/params')\(.*\);|local p = import '../params.libsonnet';\nlocal params = p\1;|" $component
sed -i "s|^local env = std.extVar('__ksonnet/environments');|local env = { name: std.extVar('qbec.io/env'), namespace: std.extVar('qbec.io/defaultNs') };|" $component
done

if [ -f "components/params.libsonnet" ]; then
  mv components/params.libsonnet environments/base.libsonnet
fi


echo "Main structure created, please update your environment parameters manually:"
for env in base $envs; do
echo "  ./environments/$env.libsonnet"
done
echo
echo "Then run \`$(basename $0) rm\` to remove:"
echo "  ./app.yaml"
echo "  ./lib/"
for env in $envs; do
echo "  ./environments/$env/"
done